ITHE WORLDS LEADING PUDLICATION FOR THE RADIO CONTROL ENTHUSIAST

This Page Intentionally Left Blank

The Futaba 6JCTnakes maximum model boating more thanpossible, it makes it simple. Usingthe total performance electronics ofthe J-Sgries, the new 6JB gives you.the conVoI it takes for total scale

realism. Built into our 6 chafsystem are a dual throttle mot^-..exclusive throttle/rudder mi)3^^circuit and heavy duty, watcilightSI07; servos. And, as with allJ-Seq^ystems, you've go^irectServo^ntrol, modular AN^r FMRF boards, sophisticated logic circuitry, built-in servo reversing,adjustable. ODen-aimbai control

gft'e our6i|B a twenty-one gunlalute. just tell your ship that heradio has finally come in.

jBrograni your n^l cruise. Adjustable tlirou ,gilder and tnixinj; controls are cofficalvd \ & '

thcliuck ol'lhfTfi.lR iransmitUr. '

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VOLUME 16 NUMBER ia ISSN OG33-6866 DECEMBER 1S7S

EDITORIAL

From The Shop 2

The StingSilent Power

RC Flying And The Law Part XII

Take A Sailplane Out To Launch TodayLou Proctor And His Magnificent Flying Machines

FEATURE ARTICLES

32

37

38

42

44

ROM Visits The Air Force Museum 46

Vaireze 49

CG Or Not CG — That Is The Question 53

Trans Mitt 54

Semperfi 56King Rat And His Pietenpol Fighter Bomber 65

Get Your Pants On! 70

ROM's Model Of The Month Contest 170

A Better Way To Clean Engines 178Aileron Servo Connection 178

DEPARTMENTS

Cunningham on R/C 8

Engine Clinic 10

Sunday Rier 15

Soaring 22

Scale Views 27

Radio Spectrum 61

Big Is Beautiful 63

Pit Stop 66

Here's How 68

For What It's Worth 74

Editor and Publisher

Don Dewey

Executive Editor

Patricia Crews

Technical Editor

Dick Kidd

Assist. Editors

Dick Tichenor

Eioy Marez

Graphics Editor

Barbara Richardson

Assist. Graphics EditorsMary Robillard

Mary Ann Forney

Art Editor

Susan Steele

Associate Editors

A) Kindrick — Chuck Cunningham — Jim OddinoGene Husting — Clarence Lee — Dick BradfordKen Willard — Jeny Smith — Dick PhillipsClaude McCullough

Contributing EditorsBen Strasser — Geoff Watkinson — Bob Wallace

Arthur J. Sabin — Paul Denson — John A. deVries

Office Staff

Beverly Calhoun — Kathy Acton — Jane Wall — Pat JohnsonEdith Olah — Sheila Pierce — Doreen BradleyBeth Strenkoski — Denise Schwartz — Chris Nicholson

Bridget McCloskey — Rachel VanderVorst — Mary PetersenRay Reha — Dave Fredricks — Pat Stark

This Month's Cover

I features internationally knownmodel. Debbie Zullo, surrounded by

products that will bring Christmascheer to any modeler. Photo by DickTichenor.

PRODUCT REVIEWS

Micro-X Products: Taylorcraft 19

Prather Products: Prather 40 Deep Vee 40

Craft-Air Inc.; Drifter II 41

Royal Products Corp: Pitts S-2 64

MERCHANDISING SERVICES

Showcase '79 76

Readers Exchange 188

Advertisers Index 189

Readers Service 189

GtC MODELER MAGAZINE is published monthly by BJC Modeler Corporation, Don Dewey. President, Editorial and Advertising offices at 120 West Siena Madre Boulevard. Sierra Madre.CaJiiornIa91024 Telephone: (213) 355-1476. Entered as second class matter at Sierra Madre, California, and additional offices. Contents copyright 1979 by fVC Modeler Corporation, All rights reserved.Reproductions in whole or part, without written permission of the puWIsher, is prohibited. All prices appearing In this magazine are subject to change without notice, AH subscriptions will be taken at theprevailing rate.

EDITORIAL CONTRIBUTIONS are welcomed by fVC Modeler Magazine. Butcannotbeconsidercd unless guaranteed exclusive. Manuscript must be accompanied by return postage and any materialaccepted for puMcation is subject to such editorial revision as is necessary, in our discretion, to meet the requirements of this rnagazine. Editorial material is selected on thebasis of general interest loihe radiocontrol enthusiast and the publisher assumes no rcsponsibillly for accuracy of content. The opinions stated in published material are those of the individual author and do not necessarily reflect those of thepublisher. IVC Modeler Corporation assumes no responsibility for loss or damage of editorial contributions. Upon acceptance, payment will be made within 30 days of publication, at our existing currentrate, which covers all authors rights, title to, and interest In, the material mailed including, but not limited to photos, drawingsandart work which shall be considered as text. Submission of the manuscript tofVC Modeler Magadneexptesses a warranty, by theauthor, that the materialls In no way an Infringement upon the rights of others. Note: The review or discussion ofanyproductby ROM does not constitutean endorsement of that product nor any assurance as to its safety or performance by ROM,

SUBSCRIPTION RATESs The United States $24,(X) per year, $47,00 two years. Single copies $2,25 each. Foreign subscription Including Canada and Mexico $32.00 for cme year (no two year foreign).For further information, see sufascripbon ad. Change of address notices, undelivered copies and orders for subscriptions are to be sent to P.O. Box 487, Sierra Madre, California 91024. Allow 6 weeks fornew subscriptions and changes of address. Back issues available: $2,50,

ADVERTISING: Send advertising copy and complete instructions to Advertising Department. fVC Modeler Magazine, P.O. Box 487. Sierra Madre, California 91024. Telephone: (2131 355-1476.

From the ShopDON DEWEY

uiU IH^Goodrich

111 III i*BwrrrPTH

John Elliot gave a little extra coaching to Miss Debbie Zullo, RaceQueen. Dick Tichenor photos.

They call it fringe benefits.They, in this case, are our

Rover Boys, Dick Kidd andDick Tichenor. B.F. Goodrichextended an invitation toRCM to attend a presspreview of the 7th AnnualB.F. Goodrich SCORE Off

Road Vehicle Races at

Riverside (California)Raceway. Our guys justifiedattending the press partybecause Goodrich had set upa scale model of the race course and Cox Hobbies wassupplying R/C cars and support personnel for races betweenthe professional drivers and members of the press.The two Dicks came back the following day with a few tales

of their adventure and they smiled a lot. The Cox R/C carswere the hit of the party and B.F. Goodrich was a superb hostwith an out-of-sight catered luncheon. There was also somereference to four open bars at the party and demo rides in thefour wheel drive machines.

Our compliments to John Elliot and Don Hatcher of CoxHobbies for a first class public relations job in promoting R/C tothe press and racing fraternity. Thanks to B.F. Goodrich fortheBlimp Pilot Certificates given to our guys and the change ofpace for the RCM staff.

♦ ♦ ♦We received the new issue (Vol. 11, No. 3) of the Quarter

Scale Association of America Monster News. As usual it is onedandy newsletter and in this issue the editor, Lee Taylor, bearsdown in his editorial column on a subject that should concern

iffVDick Kidd took a turn for the press drivers. The press beat the prodrivers by only 1 second for fastest time.

everyone involved with large models. The following is a part ofLee's editorial.

Quite a few of you out there still haven't fully realizedjust yetthat we are dealing with miniature aircraft, not the usual modelplanes, and a couple of our members are now paying dearlyfor that attitude. What I am getting at are propellers. And thepower of the engines that are swinging those props. Since weall started modeling, the standard starting procedure hasbeen to grab the model with one hand, kneel down In front ofthe model, and flip the prop with the other hand. That was allwell and good as long as we were still playing with the littlebirds with toothpick props and small engines. Even the .60'scould be restrained this way, albeit with some difficulty.Now, however, an entirely different situation has come into

being, but almost all of you are still starting the planes thesame way. The planes are so powerful that an anchorman hasto really strain to hold onto these birds at full throttle, and theprops are so big that they are darned hard to reach around. Ithasn't affected our starting procedures, though, we still kneeldown In front (no chance of getting away from a chargingplane), reach around the prop to hold the plane (no thought tothose prop tips 1/2" from the forearm), and start the birdswithout an anchorman holding on (don't worrry, It's on lowthrottle).

Guys, we gotta break that habit, and I'll tell you why. Theseplanes aren't gentle — they are big and they are powerful.Those props are big, they have quite a bit of inertia and. If youget tangled up In one of them, they are mean! Several of ourlong-time members are sporting- scarred forearms wherethose prop tips got a little too close. One member Is even

to page 185

Don Hatcher and John Elliot, Cox Hobbies,got 'em started and kept 'em running. DickKidd tries to learn how.

Dee Robson, representing B.F. Goodrich,gets Dick Kidd suited up for a demo ride.

Miss Vikki Carr handled the RIC buggies aswell as she handled her full size jeep.

Are vou an RjCBEGINNER?' HERE'S YOUR CHRISTMAS PRESENT!

CHRISTMAS SALE!sicmmsi smcn thfs RC Plane C ingine^ Camba!

CHRISTMAS SALE! TJI.^LlIIlNAuMSii,seemiieiis! sm f26.90en this SCPiaue S Cneine X" ® i>9">e

Combe! /•«»*-/

HLA116CA

Hobby Lobby PapilionMotor Glider & Cox .049Engine jotal list price S35.90

Easy to build-very easy to fly all balsa 2channel powered glider. The totally inexperiencednC beginner can fly this! hW wing span. Wehave the Accessory Pack No. HLA1t6AP forS11.9B. The Accessory Pack includes everythingelse you need to get the Papilion ready to fly except the 2 channel radio that's required. We havespecial prices on Futaba 2 channel radios whenbought with this Papilion deal! Please call us!

.SIG031CA 0 Sig KADET andFox 36RC ENGINETotal list price $83.90

Sig kadet is a 57" span all balsa 3 or 4 channeltrainer. Considered one of the best b^inner'splanes. If you order this kit and engine combo youmight also want to order the Accessory Pack No.SIG031AP, 330.24, The Accessory Pack includeseverything else you need to get the Kadet ready tofly except the 3 or 4 channel radio that's required.We have special prices on Futaba 3 and 4 channelradios when bought with this Sig Kadet deal!Please call usi

fteDo You like a DEAL

on BUILDING SUPPLIES?HERES YOUR

CHRISTMAS PRESENT!

13 Different Bags of ourBULK Packaged Hardware

in a ChristmasGift Box!

HLH8OOCB1

HLA110CA ^Hobby Lobby ®Junior Telemaster&Fox 25 RC ENGINE ?59.00

Total list price $79.90Junior Telemaster is a 50" span all balsa 3 or 4

channel trainer. Recommended in product reviewsas an excellent trainer. We have the Accessory PackNo. HLAIIOAP for 333.73. The Accessory Packincludes everything else you need to get the Jr.Telemaster ready to fly except the 3 or 4 channelradio that's required. We have special prices onFutaba 3 and 4 channel radios when bought withthis Junior Telemaster deal! Please call us!

WIK msn WOODAssoemm

in Christmas Gift boxes!

SAVe X/S.07/SULLIVAN SUL521

'12 Volr ELECTRIC STARTER

$23.88You don't to si>op itokmdlor 0 Oellor stirtgr {tbit« isn'ictffll. nor tor a lowir prtca.

List price $38.95ACCESSORIES FOR STARTER:

SUL523 4-in-1 Starter Cone S4.9S. Turned aluminum, with V-groove for boat starting.SUL524 Spare Rubber Adapter 79

Spare rubber insert.

IN Scale Instruments! 'N.- HLH817 ^

Hobby Lobby1/4 Scale Cockpit

Instruments

$9.9520 Abioluia Scale reproductions of luir sije aircralt in-sirumintt. Faces are printedin 4 colon, are die cut. endare on pressure adbesave Mat

blacki stock. Iiutrumini ht>ut'inQS are aceuraialy itioldadseila rtprodueiiorts. And tbartAtcdev plMiic tacn that snaptrtto aacH housing. A superbproduct irem West GertnanvV

#

® i4f W in white boxwith Christmas ribbon!

\

$3900(2 roils each of most popular colors)

HLC600CB

How to sove OS mucb os SO"/.

CALL US!we make buying mistakes occasionally...(" Occasionally'" How about "Irequently?"

signeU: Hobby Lobby Accountant)Anyway... our telephone sales peoplehave lists of THINGS THAT WE ARESTUCK WITH. Call us and ask for...EX-PURCHASING AGENT'S MISTAKELIST Number 3."

Have you worn out all the Cutters andGrinders for your Dreinel Moto Tool?

DRE100RC

Dremel CutterAssortment

$8.987 items in assortment- cutters, engravers,grinding wheels, cutting wheels.

Are you wonderingwhat to buy your favorite RC

nut for Christmas?Try Hobby Lobby Gift Ceitificates!

About 3110 worth compared tousual list prices.

There are three thingswrong with this wood:It still has the sawduston ii; It's a little longerthan 36"; It doesn'thave anyone's namestamped on it.

20-1/16x3x36 10-1/8x4x3620-1/16x4x36 10-3/16x4x3620-3/32x3x36 10-1/4x3x3615-3/32x4x36 Order WOOOOICB

... 411 of this balsa wood (105 sheets total!)packed in heavy white boxes suitable for aChristmas Gift.List price value, $122,00. Our Reg. price $85.65

Christmas Sate

BAT005CBat. MkM-CtWmitm

BatteriesI t.oll 500 T.- i.„

^fornSH.01'

Replace alt 12 nicads In your radio!{8 in your transmitter - 97 fArSfOOS.

V 4 in your receiver pack)

R&S HOBBY PRODUCTS

SKYGLASS FIBERGLASS & FOAMAIRPLANE KITS

We don V know of a cheaper way foryou tooutfit yourself wiihaliigh performance fiberglass RC plane!

Hobby Lobby gives youthe best phone and mail-order service

in the RC hobby!Since we opened m 1964 Hobby Lobby has had a leputanon lor givingreliable and customenotienled service. Outing Ihe past several monthswe have radlcilly imprsved our service. We have added highly trainedphone salespersons, more phone lines, customer service specialists and anon-line computer system.

Here's what ear impravements mean ta aax1. We actually fill your order while youare phoning it in to us!2. We are rarely out of stock on an itemwe intend to carry!3. If we are out of stock we can tell youwhile you are on the phone-Just ask!4. When you order an RC kit, we can tellyou exactly what accessories you 7/ need

for it while you are on the phone!

5. We won't waste your time wh He you 'redialing our number-we have plenty ojphone lines!6. We won't waste your time when youreach us on the phone-we have plentyof sales people!7. Your questions about your orders,(deliver^', back orders/ can be answeredinsrantfy on the phone!

F-ltADtlaie S94,00 Phgtniie-SD SAI.IiMIG Z1 DHunt — $94,00 NarerKtur SO S47.4SF-6 0<l»t — $94,00 OamhnSO S47,4SCurauiSO SS2.O0 P^7 00 $47,45E-Z DonllTrdntr SBZ.OO Troublemtker 00 $47,45BitrcarSO $47,45 ,40Si2eKitsSunFli4-eO $47,45 A6lntrud>r40 $4],00KwlkFli3-60, $47.45 C«ll»ii40 $43.00Kvhk FliS^O $47.46 Fhotnix 540 $43.00CuHinSupranieOa. $47.45 ME-105 40 S43.00FhoiniiMO $47.45 JtpZno40 $43.00Vtrtna II $47.45

Our Stock FUTABASYSnumber

FUT201

FUT301

FUT401

FUT601

TEM

FP-ZF w/S-7FP-3S w/S-18FP4FNw/S-18FP-6FN w/S-16

ListPrice

$149.95

S144.95S289.95$369.95

SALEPRICE!

plitrvwo I

Prices in effect to Dec. 30,1979, but also subject to change if list prices increase.

Stock No. Description Price Qty. Amountrcm 12

AAi /wAfri (,tli < e'uiiiw !•>! vou In

Vu ihli <i(/l Cffllflroir flS eolft /»r purfltufifhom Ihtbr I obi

Gift Ceilificate $20.00 eachThese are in $20 denominationsand are printed on heavy embossedpaper to make a fancy appearancewhen opened up for Christmas.

Order HGC001

SHIPPING CHARGES: SUBTOTALPrepaid $1.90 , ,C.0.0 $3.60 6% Tax (TN only)Credit Cird $3.60 ^

Sm "irV.

Name

Address

City State Zip

Master Charge Visa

Card No.

Expiration Date

INTERNATIONAL

Rt. 3, Franklin Pike Circle, Brentvvood, TN 37027 - (615) 373-1444.

Do You need TOOLS for your shop?HERE'S YO{^R CHRISTMAS PRESENT!

sm OP TO mos on roesp dremel roois/ wc^-js/fh

DRE730

1 DISC-BELTI SANDER. List price S89.95

DRE804CB

B ASSORTEDBELTS

List price S15.80

DRE572

DELUXE MOTO- DRE381SHOP with Accessory Variable Speed

Kit MOTO-TOOLKIT

DRE580

TABLE SAWList price $99.95 List price $74,95 List price $99.95

DRE215

D-VISE withTOOL HOLDERList price $26.95

WID001

WIND METER

price $8.88Hand held meter. 2 scales,210 MPH and 4-66 MPH,Accurate and durable, 7" tall.Includes plastic case.

K&S EngineeringTUBING BENDERKSN321 99^Set of 5 springsbend tubing 'without flattening.3/116

1/16" thru".

Disc-BeltSander. ^6000 $45^0 fio00 fff00

CHRISTMAS SALE!SAVE $35.35!

^ List price^ SB 1.95

MIL017 MILLER

BALANCE

ANYTHING!Would you ever believe it'spossible to balance not only eprop, but also the prop NUT?Don't laugh-this thing'll dojust that. It'll also balancespinReis, flywheels, boat props,anything that's got a 1/6" to3/B" hole In it. Beeutifuilymade HIG001

PAINT SPRAYER $46.60 High Point BALANCER $23.95

SmtJS.9S!BADoen t

BAD003 BADGER DELUXEAIRBRUSH OUTFIT.... $27.00List price $42.95

BAD001 BADGER HOBBYAIRBRUSH OUTFIT......$6.99List price $11.00

BAD101 Spare Can ofBADGER PROPELLANT (forBadger airbrushes) $3.00

siHSMmAL m PRices!PMOR£ p00r 0fiter in quickly!

Bridi RCM TRAINER 40 BRI006List price $54.95

54" Span for 4 channels,.35-.49 engine.ADVANCED TRAINER.

Prices in effect only to Dec. 30,1979. COD or CREDIT CARDS only!Prices subject to change if list prices change.

When you phone for your kit, order the KIT ACCESSORY PACK.We've figured out every hardware and covering item that's neededfor each kit in this ad. Our ACCESSORY PACKS contain everything you need to complete the plane except for engine, radio andtools. Cost? Usually less than the kit.

AND002

Andrews H-RAYList price $39.95 q-i

Gentle trainer! Easy tobuild! 50" span for .15,2-3 channeLs.

BRI002Bridi RCM TRAINER 60List price $62.95

say?" span for 4 channelsfor .40-.61 engines.Advanced Trainer-CADILLAC OF BALSA KITS!

Qridi SUPER KAOS 40List price $55.95

52" span, 4 channel, for.35-.49 engine.GREATFLYFR!

BRI005Bridi DIRTY BIRDY40

List price $59.95PATTERN FLYER ONA BUDGET! 58"span. • BR1018

Airtronlcs SQUARE SOARGLIDER AIR101List price $24.95 5''

EASY, EASY TO BUILD!72" span, for 2 channels.

sm 46'/o SAVE 36%!from $82.90 list price!

FOX263CBFox EAGLE 60 RC

withPerry Carb!

$45fib

Fly ElectricCheap!

Malibu Powered Glider

Are You a BIG AIRPLANE lover?

HERE'S YOUR CHRISTMAS PRESENT!

CHRISTMAS SALE!SAVe m9.95 on thisCtAHT kC Ptone 0 inqine

Combo!

CHRISTMAS SALE!"The Worid'S Creotest

f/y/n0 PC A/rpiane**'^fontostic comhinotion

deal...

SAVef3.00 SAVeiMS!

E3ROA011

TAT080

TATONE

ENGINE TESTSTAND $7.50List price $10.50

Robart ModelIncidence Meter

li 5.95 $10.50

Astro .05 Astro FlightMotor Battery Rapid ChargerA5TR0 FLIGHT AST103CB

SUPER MALIBU OUTFIT. $77.00Total list price $119.85

Electric airplanes fly best when they have lots ofwing area in relation to the motor size. Reason;the batteries are pretty heavy. So, what better wayto successfully fly an electric than to fly anelectric-powered gliderll This works-try it! (And,save a bundle off the regular pricel)

ASTRO FLIGHT BOOK BOOOD8

QUIET REVOLUTION $5.95All about electric flight.

HLA112CA

Hobby Lobby12 FootTelemaster8iEvra 190 ENGINE

Total list price $338.95With its monstrous 3729 sq. In. of wing-stab

area and relatively light flying weight the 12 FootTelemaster Is a gentle flyer with huge liftingcapacity. We have the Accessory Pack No.HLA112AP for $77.13. The Accessory Pack includes everything else you need to get the 12 FootTelemaster ready to fly except the AluminumShock Mount ($9.00 when ordered with thiscombo) and the 4 or 5 channel radio that's required. We have special prices on Futaba 4 or Schannel radios when bought with this 12 FootTelemaster deal! Please call usi

HLA107CA

Hobby LobbySenior Telemaster &Fox 60 RC ENGINE

Total list price $169.48 dThe combination of huge wing and stab area i

(1653 sq. in.) and very light weight make the all qhMcfl 5aBninr T»l»fnattAr thn nrdJitfict '

f/2700

balsa Senior Telemaster the greatest (and easiest)RC flyer of all. We have the Accessory Pack No. }HLA107AP for S47.25. The Accessory Pack in- ]eludes everything else you need to get the Senior JTelemaster ready to fly except the 4 channel radio ilthat's required. We have special prices on Futeba .(4 channel radio's when bought with this Senior 'iTelemaster deal! Please call usI <

INTERNATIONAL Rt. 3, Franklin Pike Circle, Brentwood, TN 37027 • (615) 373-1444

SAll'seitSATfOm HIT PStCfSfiFH0H€_ your order in uieM^iPrices in effect only to Dec. 30,1979.COD or Credit Cards only!

When you phone for your kit, order the KITACCESSORY PACK. We've figured out everyhardware and covering item that's needed for eachkit in this ad. Our ACCESSORY PACKS containeverything you need to complete the plane exceptfor engine, radio and toois. Cost? Usually less thanthe kit.

Are You an RjC Boater?HERE'S YOUR CHRISTMAS PRESENT!

OP TO 00% fl2 PRICE!■'SAVe $20.50!SWAMP BUGGY and

ENGINE COMBINATIONS!These are simple to build because most of the

[parts are die cut plywood. Engine installation ist easy-just bolt it on and use an airplane prop. RC.equipment installation is easy-just rudder-only or, rudder and throttle control to hook up.

They run on water, snow, wet grass-just aboutI anything.' Buy one now and SAVE, at these specialI coinbination orices!

DUM106 DUMASPAY 'N PAK 20 HYDROPLANE

ALL PL YWOOD CONSTR UCTiOf^l30" LENGTH ... EASY TO ASSEMBLE!

ANiy-A VERYFASTBOAn

List price $41.00 OwW $20.50;

Lanler TRANSIT A-R-FList price $47.95

3 channel BASICTRAINER, 65" span for.3545 engines.ALMOST READY TO FLY!

LAN 108:

Lanler COMET III ist prir-fi $64.95

63" span ADVANCEDTRAINER. For 4channels and .50-.61engine. Almost ready to fly!

LANIOBr

Lanler CESSNAList price $49.95

48" span. GOODBEGINNER'S PLANE.For 3 channels, .19engine. Almost ready to fly!

LAN119

$Al^''s£FSAmm m pmesiPHOH€_ four order in quiektf!

Prices in effect only to Dec. 30,1979.COD or Credit Cards only!

When you phone for your kit. order the KITACCESSORY PACK. We've figured out everyhardware and covering item that's needed for eachkit in this ad. Our ACCESSORY PACKS containeverything you need to complete the plane exceptfor engine, radio and tools. Cost? Usually less thanthe kit.

DUM003CB DUMAS LITTLESWAMP BUGGY and COX .049ENGINE $17.8818" long Swamp Buggy.

Total list price value - $26.95.

Order following Running Hardware kit for .Pay 'n Pak 20:

DUM206 Dumas Running Hardware forPay 'n Pak 20 List price $30,00 S24.00FOX225 Pox 25 RC engine for Pay 'n Pak 20List price $36.95 S29.97 You can buy the Boat Kit IDUM106) and the,]Running Hardware (DUM200) for only S44.S0'List value $71.00. .If you buy all three: Boat (DUM10S), Running'#< ou pippp toHardware (DUM206! and the Fox 25 RC Engine, ^ . . ^(F0X225)... pay only S69.00 for all three! List price $

SigKGUGAR SIG035List price $52.50 gtAtfl

SHARP LOOKING 4 "fnoCHANNEL plane. 51 "span $36.9^for .35".50 engine.

SIG003

DUM004CB DUMASSWAMP BUGGY and FOX 19RC

ENGINE $44.0028" long Swamp Buggy.

Total list price value — $68.45.

'/2 DUMAS

DEEP VEE10DUM110 TAKE YOUR CHOICE . . .112 PRICE WOOD KIT— OR— l-'5' price $12.50DUM114112 PRICE FIBERGLASS KIT A nn'

List price $22.50 Vi l.tt,

$6.25

49.95SCALE KIT. Big 71"span for .19 to ."35engine. 4 channels.

DUM505CB DUMASBIG SWAMP BUGGY and FOX

.40 RC ENGINE $49.9931" long Swamp Buggy

Total list price value — $82.95.

Here's a cheap and easy way to try RC boating.',Order either the easy-to-assembie wood kit, or thefully assembled fiberglass kit. Use an .049 to .09;or .10 engine.Order one of the fcllcwing Running Hardware Kits:DUM209 Running Hdw. for Cox .049 ...SI0.50'DUM226 Running Hdw. for OS .10 S16.75 ]DUM227 Running Hdw. for Enya .09....316.75

Marks WANDERERList price $23.9572"span 2 channelglider.VERY EASY TOBUILD! Just $16 will buy theaccessories to get it ready to fly!

72 marom SEdSATiOm KIT PRICES! PKOKE your order in quickly! $23.99$^3.99 prices in effect only to December 30, 1979, COD or CREDIT CARDS only!When you phone for your kit, order the KIT ACCESSORY PACK. We've figured out every

19

S1G041Sig BEECHCRAFT BONANZA

List price $77.50 AlptSCALE! with easy-to-build ABS plastic $^9-^^cabin. 64" span for .60 engine.

SUR116

SureflltePIPERJ-3

List$39.95

hardware and covering Item that's needed for each kit In this ad. Our ACCESSORY PACKScontain everything you need to complete the plane except for engine, radio and tools. Cost?Usually less than the kit.

M.E.N. TRAINER MEN002List price $31.95

58" span for 3 channels 03.99and .I5-.25 engines.Super stable beginner's plane!

Midwest CESSNA A-R-F MID125List price $34.95

ALL FOAM- ^.,r#ASSEMBLED!Flies best with a .15 and C2.\.9"3 channels.

BudNosen AERONCA CHAMPList price $99.95 ,

9 FOOT SPAN! $AtCtNON002 $69.99

engine, 52" span, 2 to4 channels, 2 hour assembly.

SUR109SurefliteCESSNASKYLANE182 FOAMA-R-FList $39.95

For .15-.19 engine, 53" span,420 sq. inch area, 2 to 4 channels.Steerable nose gear, 2 hr. assy.

Midwest ATTACKER A-R-F mAI(!List price $44.95 MID134 9

All-Foam, 3 hour assembly! $2148" span, for 4 channels, .19-.35 eng.

Midwest SUPER MID126CHIPMUNK List $35.95ALL-FOAM^ CAL£''ASSEMBLEbl ^5,0946" span for 3 5^^*channels and .10 to .19 engine.

Sig COLT SIG043List price $25.95 ^At ft

45" span FOAM WING.3 channel trainer. For >»'■».09 to .15 engine.

Top FliteF4U CORSAIR T0P121List price $99.95

61" span for .60 engines,4 channels. Pre-formedbalsa fuselage shells tosimplify construction!

'#5

Rt 3, Franklin Pike Circle, Brentwood, IN. 37027* 615/373-1444 INTERNATIONAt-

C. Papilion

A.6 Channel Radio

Senior Telemaster

E. Junior Teieinaster

B.

3 Channel Radio ^

nuv^ H. 12 Foot Telemaster I.Evra 190Engine

K. Harpoon

Q. Cessna .09

"Cessna Skyhawf P. SchneiderVariprop R. Superkote

T10" Mul

U.12" Multi-Prop

N. Gemini BIpe

0. Easy Flyer

t/SHobby Lobby gives you

the best phone and mail-order servicein the RChobby!

Phone in vour order and have It shipped the same day. We can shipCOO or you can charge It to your VISA or MASTER CHARGEcard, ($3.60 handling on COD or Credit Card). On mail orders add$1.90 for handling.

V. Delta 40

W. Taig Micro Lathe

INTERNATIONAL

Route 3, Franklin Pike CircleBrentwood, TN 37027

Cjsa'iwafINTERNATIONAL

A. HL 6 CHANNEL RADIO HLR004

The Hobby Lobby 6 Radio System is your best buy: Spareservos for the main flight function^There is no radio made that

Lobby radio;electronica

antennas

still work

pack; Y

-lar^riM scalecise that the ser

center every time;drain-they'll flyHL radios is perfoUS!

HLR200

yairectiu

ceiuc

tiirobb^

only S14 each;than a^^by

ned

Radio will

* in its^borne battery on^latM of a Hobbyu^; iqiiJoWick jpnsion isstroj^welftug^ for thedfla^itliClSar^^ pre-

same

current

on a charge; Service onsame people who sell them-

Our Price $219.00Flight Control Servo for HL6 and HL3 —$14.00

B. HL 3 CHANNEL RADIO HLRQ103 channel Transmitter; 3 channel Receiver, 3 servos, airbornebattery box and switch harness, servo mounting grommetsand extra output arms and wheels, Instructions, 3 monthlimited warranty and your choice of any 72-75 mhz. bandfrequency. The system requires 4 alkaline pen cells for thereceiver and a 9 volt battery for the transmitter and is readyto install in your RC plane, boat, or car.

Our Price $129.00

C. PAPILLON HLA116

45!4" span, for 2 channels and .049 engine. Beautiful trainer,stope-soarer, schoolyard flyer, thermal soarer. Its slow,gentle flight is perfect for a beginner.

List Price $24.95 Our Price $17.96

0. SENIOR TELEMASTER HLA107The easiest flying RC airplane ever! Huge wing area {95"span. 1330 sq. in. area) and ultra light weight allowSENIOR TELEMASTER to do things that other planescan't; Like 2 foot takeoff rolls; like 7 mph landings. For 4channels and .40-.60 engines.

Regular Price $99.50 $ai€ 586.86E. JUNIOR TELEMASTER HLAliO50" span. 409 sq. inch wing area for 2 to 4 channels(ailerons are included) and for .10 to .25 size engines.Machine cut balsa. Nice stable flight for the beginner whogets to start right off with "full-house" (4 channel) flight.

List Price $42.95 $29.99

F. POWER CENTER HLH3026" X 3 5/8" power panel at a super LOW PRICE. Hasconnections for 114 and 2 volt glow plugs, 12 volt electricstarter, electric fuel pump. Has "fuel" and "de-fuel" switchfor pump. Has meter that indicates glow plug condition andcurrent flow during fast charging of your radio pack.

List Price $29.95 chr/^tmtts Sofe $15.44G. HOBBY LOBBY Z IO ADHESIVE HLH30114 gram bottle. Why pay more than this for a cyano glue?

Regular Price $2.44 QfifisttHOS SotC $1.99

H. 12 FOOT TELEMASTER HLAn2Gigantic 12 foot span RC plane with unique features likeair-boosted ailerons (so one small servo can easily move bothhuge ailerons), 2-plece wing for easy transporting. Designedto accept our Evra 190 engine with its aluminum shockmount. Flying the 12 FOOT TELEMASTER Is as close as anRC'er can get to the sensation of flying a full scale plane.

List Price QfffJsttnaS Sotc $139.00Christmas Sale prices in this ad are good toDecember 30, 1979. Other prices are subjectto change.

ChriSttnosI. EVRA 190 ENGINE $afe HLE001Hobby Lobby's EVRA 190 is a 2 stroke cycle ignitionengine designed for very large RC aircraft, like most 1/4scale planes and our 12 Foot Telemaster. It is 1.9 cu. in.displacement (31 cc.) roughly 3 times bigger than a .60Runs very economically on regular gasoline mixed with 2cycle oil.

List Price $139.95 $afe $79.00Aluminum Firewall Mount with 4 Lord Shock

Mounts HLE006 $19.00Muffler HLE005 $ 9.00

J,K,L,M,N,0-Hobby Lobby/JLM A-R-F KitsAll these fabulous "kits" are really "A-R-F's" (Almost-Ready-to-Fly). Wings are foam and are already sheeted with balsaand tips are in place. Fuselages come fully built plastic withfiberglass reinforcement. The fuselages are so smooth youcan fly them "as is" if you want. Control surfaces are balsa.Just a few hours after you open the box you can have thebest looking, most durable RC airplane you've ever seen.

J. MINI STAR SA¥€S20^ HLA133A very hot performer! 50" span, 460 sq, in. wing area, for.35-.46 engines. A mid-sized pattern-sport plane in theEuropean style. For 4 channels.

List Price $100.00 .. . .... SAUSS9^K. HARPOON FLYING GOAT HLA131Did you ever see a better looking seaplane? Here's the easiestway for you to start flying off the water. 57" span, 540 sq.in. wing area for .35-.40 engines and 4 RC channels. A nicefeature is that the pre-built polyflite fuselage is automaticallywatertight.

List Price $115.00 Our Price $93.00

L. CF-5TIGER SAVi^369$ HLA134Very, very swift! This is an all-out large pattern plane with avery low drag factor. CF-5 Tiger is 61" wing span, 660 sq.in. wing area. Fuselage is 48" long! For 4 channels and hot.60 engine.

List Price $135.00 SALC

M. CESSNA SKYHAWK HLA136

BIG-the fuselage is 6" wide at cabin! Near scale model thatmakes a great beginner's plane or beautiful expert model.66" wing span, 680 sq. in. wing area, for 4 RC channels and.40-.60 engine.List Price $120.00 Our Price S95.00

N. GEMINI BIPE $A9B$2999 HLA135Designed by Jim Newman. Gemini Is a spectacular performer.J.L.M's clever engineering solves a host of biplane buildingproblems: Fuselage and cabane strut-completed; win9s-4panels all sheeted with tip blocks in place; wheel pantsmounting plates-soldered in placel 46" span. 740 sq. in.area. For .60 size engines and 4 channels.

List Price $150.00 ... $AU$9999

0. EASY FLYER HLA132This is a 4 CHANNEL beginner's plane-a very gentle flyerthat's stable, recovers quickly from unusual attitudes and isvery EASY to assemble. 57" span, 540 sq. In. wing area, for.35 to .40 engines. The very clear plans are ideal for a fint-time RCer.

List Price $100.00 Our Price $79.00

P. SCHNEIDER VARIPROP VPPOOlIn-flight variable pitch propeller. 11" diameter, spinner size2" diameter. For .40-.60 engines. A standard RC servo issufficient to operate the pitch-change mechanism. Reversepitch for very short landing roll-Low pitch lor landingpattern and final approach-High pitch lor fast entry tomaneuvere such as 8 point roll.

List Price $149.95 CtlfiStmOS So/C $99.00

HLA122

Q. HOBBY LOBBY CESSNA .09 TRAINER427:" span, for .049-.09-.15 engines and 2 or3 channels. Allbalsa—very easy to build. A great beginner's plane!

List Price $38.95 $28.97

R. HOBBY LOBBY SUPERKOTE HLC601-615Sensational plastic heat-shrink model covering! Each rollis 27" wide, 6 feet long. Easiest to apply, tremendousshrinkability, strong, no air bubbles, requires low heat,invisible joints, great for foam airplanes, resists sagging.

601 Cesini White 606 Aero (lU Blue 6i i Terra Green602 Beechereft Red 607 Metallic Gold 612 Taylorcraft Cieim603 Piper YellGW 606 U.S.A.F. Aluminum 6i3 Metallic Blue604 Waco Idk) Blue 609 Midnight Black 614 Metallic Green606 Ryan Orange 610 Campaign Btowm 616 Metallic Plum

(NEW PRICES) List Price $8.69 per rollHOBBY LOBBY PRICE $4.99 per roll

S. HOBBY L0BBY/TRUEL1NE TIGERThe 52" span foam wing comes READY SHEETED withObechi wood veneer-just epoxy the two panels togetherand cover with Superkote. The fuselage and tail are verysimple balsa sheet structures. Construction is a snapl Anddoes it ever FLY . .. ours holds knife-edge attitudes almostwithout the flyer having to hold control pressures. It doesvictory rolls straight up until it's almost out of sight, and itslows down like a trainer for easy landings. For .40 enginesand 4 channels. A beautifully crafted English import.

List Price $89.95 HLAllS Our Price $66.00

T. HOBBY LOBBY/SLEC 10" MULTI-PROPHLH201 ListPrice$l4.^O..0urPrice$ 9.99U. HOBBY LOBBY/SLEC 12" MULTI PRGPHLH202 List Price$l5.95.. Our Price$11.99Props can be adjusted on the ground to any pitch you wantiEach prop comes with 3 blades, but can be used as a 2, 3, or6 blade prop. HLH203 Spare 10" Blade - 99^

HLH204 Spare 12" Blade-$1.49V. DELTA40 HLA123DELTA 40 is a double-delta RC plane for 3 channels,(Aileron, Elevator, Throttle) and .20 to .45 size engines. It'sbig (53" long, 744 sq. inch wing area) and lightweight (only3 pounds, 6 oz. with radio) so ... it gets up and goes!Delta 40 flight characteristics are remarkable; Slow flightand landings are normally at a 20% nose up attitude withexcellent handling characteristics. And high speed performance is about wfiat you'd expect... WILD! Delta 40 willdo axial rolls that'll blow your mind.

List Price $74.95 Our Price $59.50W. TAiG MICRO LATHE TAI001About half the price ol competitive precision metal-workinglathes! Taig Lathe is a heavily overbuilt machine that wasoriginally designed for light industrial use. 414" turningdiameter, 7%" length capacity. Cross slide travel 1%".Accuracy 5/10,000". Included are Taig 15" bed lathe, 1/10HP Dayton motor, mounting board, 3 jaw chuck, 1/4"Jacobs drill chuck, 7 piece tool set, tailstock, stepped pulley8i belt set, self-adjusting motor bracket. Many other access-

Sale $215.00

$36.80 Milling Tool included with Latheuntil December 30,1979!-UjTl B00009

Jit*" "HOW TO RUN A LATHE".... $2.00128 pages, lOQO's of good illustrations.Covers all facets ol lathe operation, fromthe simplest laihe to the most complexgiant industrial machines. First publishedin 1907, the book has been revised and updated 56 times. A must for owners of ourTaig Micro Lathe.

Slock No. Description Price [a. Quan. Amount

,

5U8IOTAISHIPPINGCHARGES: _

Prepaid $1.90 Tax (TN only)C.O.D S3.60 SHIPPINGCredit Card $3.60

Name

Address

City _ -State. -Zip.

Master Charge

Card No.

-Visa Expiration Date

Prices in This ad expire November 30. 1979!

INTERNATIONAL RT. 3, FRANKLIN PIKE CIRCLE, BRENTWOOO, TN 37027 ■ (615) 373-1444

Cunningham On Pf chuck cunninsham

ith the October 1979 issue,ROM celebrated the

Seventeenth Anniversary of itsbeginning. With the January 1980 issue,I will be celebrating my seventeenth yearof being included among the pages ofROM. This column began December1965, but prior to that time a number ofarticles were presented to you,beginning with January 1964. During allof that time many things have changedin the world of radio control modelers,and radio controlled models. Actually,the aircraft really haven't changed allthat much, but the real advances havebeen in radios, engines, and the types ofmodels flown. The one continuingthread running through RCM these pastyears is, however, the ever constantbeginner. Seems that this will neverchange. RC is not the easiest sport in theworld. Sure, it may be easier than skydiving, drag racing, etc., but it is a heck ofa lot harder than most other sports, andit's one that is not easy to get started incorrectly.Several months ago I wound up

another series on RC Design MadeEasy which, over the years, has madethe entry into the world of do-it-yourselfRC design much less hectic and, now,for the fourth or fifth time, we are going totry to take a long, helpful look at theproblems of the person really wanting toget into this great hobby/sport. Hardly atrip to the flying field goes by that I don'tget asked, "How do I get started in RCand where do I go for help and advice?Where do I go to buy equipment, andwhat should I buy?"Now, here is an interesting fact —

most beginners, or would-be beginners,have never heard of RCM or any of theother publications in the modeling field.They are exposed to RC by happeningupon a flying field, seeing a mall show,watching a feature on TV, or in someother manner. But they are hardly everexposed to RC by picking up a magazineon a newstand. This, then, creates a real

problem — how to help a beginner, if henever sees the pages of RCM until afterhe has made a number of mistakes.Since I don't have the answer to thisproblem, I have to make the assumptionthat those who are interested in learningabout RC will be exposed at somereasonably early date to this publication,and that they will avail themselves of the

•c^ruw,-

ieuport -

UBERATORB-24D .

opportunity of gaining some informationand knowledge from the very vast inputthat we all contribute each month. So,you want to start — how do you do it?The first question that you need to

answer is one that you must askyourself, "Am 1 interested in reallybecoming active, or am I interested injust sticking a bit of toe into the water?"Not everyone is suited to building andflying RC aircraft. It takes a dedicatedperson to overcome the trials and

hardships of building the first aircraft,learning how to fly, and learning how topick up the pieces of a demolished prideand joy, and starting over again, A lot ofpeople simply cannot accept thisdisappointment, and will drop out(making some awfully good buys inslightly used equipment available). Ifyou can answer in the affirmative, thenstick with it, you're going to really get athrill out of RC.

The second question, now that you'vedecided that you can stick with it, is howto get started and where to go for help.The best place for help is the flying field,the second best place is your localhobby shop. You have to be selective,both in who you ask, and what you ask.There really is no primer for beginnersthat you can purchase, and almostnowhere are there paid instructors, so,when you go to the flying field, observefor a bit. You will soon be able to pick out

the fliers who are helpful to others, andthe fliers who really go out of their way tohelp and to teach. Sure, these men maybe a bit overworked, but it's better to getadvice from one who is sincere, thanfrom one who may toss you anyoff-handed answer to your question.You also have to be selective In pickingout a hobby shop. Lots of RC equipmentis sold by toy stores, or stores whosereal business is trains, or plastic shelfmodels. You need to find the hobby shopin your area that really speaks thelanguage of RC. Look around, it maytake some time, but chances are that inyour cily or town there is a hobby shopthat will understand your needs.

Next question, "What do you buy nowthat you've found a hobby shop?" This iswhere the answers get a bit tough, andthis is where this series is going to be ofsome help to you. Let's examine theoptions open to you as a beginner, notknowing just what your main interestmay be sometime in the futures. Radios.Lots of choices here, not only whatbrand, but what stick configuration, howmany channels, etc. Let's start with thebrand. Your best bet is to purchase thebrand of radio that you see most at theflying field in your area. In this way thosewho want to help you will be familiar withthe operation of this radio, and problemsthat may crop up with it. If everyone inyour area is flying a red box, then go outand buy a red box. If everyone is flying agold box, go out and buy a gold box.Don't buy a black box just so that youcan be different. Stick with what hasbeen proven to those fliers in your area.

Next, stick configuration. The numberof channels (hat you decide to purchasehas some bearing upon the stickconfiguration, but not really very much.The vast majority of fliers in this countryfly with the right stick controlling theelevator and the aileron, and the leftstick controlling the throttle and therudder. Again, if most people at the localflying field fly this mode, then dolikewise, it makes it much easier to find ahelping hand when you need one. Somemodelers like to fly with the elevator andrudder on the left stick and throttle and

aileron on the right stick, thus separatingthe primary functions of aileron andelevator between two hands. You canalso purchase a single stick transmitter,

to page 182

$239.95KP-5C

WHILE THEY LAST!

^ ONLY$239.95

KP-5C

THESE ARE VERY LATE 'T?"SETS AND ARE COMPLETE. THELIST iS S375.43 AND WILL GO .VERY FAST AT SZ39.0S.

SEND A MONEY ORDER FOR PROMPT SHIPPING ALLOW CLEARANCETIME FOR PERSONAL CHECKS. NO C.O.D.'S! THIS PRICE CANNOT BEBEAT, AND THIS OFFER IS EXCLUSIVE WITH BROWN'S HOBBY CENTER.

COMPLETE LINE OF KRAFT SYSTEMSFOR 1979! $$$SAVESS$-AT BHC.

KRAFT LIST BHC KRAFT LIST BHCKP-2A .139.95 99.99

KP-4A .309.95 203.99KP-6A .339.95 234.99

KP-5C .389.95 277.99

KP-5CS 389.95 277.99

KP-7C .529.95 384.99

KP-7CS 529,95 384.99KPS 14. 15 SERVOS..

BRAND NEW 38.95FULLY GUARANTEED

BY KRAFT SYSTEMS. INC.

h .■! .J| J BRAND NEW 1976 KRAFTSI CHANNEL, 2 STICK (KP5C)

SYSTEMS. ON ANY 72SUPER

SPECIALTHROUGH 75 MHZ. CHOICEOF SERVOS-14's OR 15's.

LIMITED OFFERLIST $375.43 BHC $264.95

SEND MONEY ORDEFIFOR IMMEDIATE OEUVERY.ADDiA.OO FOR SHIPPING

$$SAVE$$ AT BHC!MODEL BHCFP2GS 75.00 6FN(S-18) . 215.004FN4(S-18) 185.00 6FN (S-16) . 235.004FN4(S-16) 205.00

"NIMBUS"4 CHAN.2 STK. 188.95

WORLD ENGINESWORLD ENGINES LIST BHCOS10FSRSTD 31.D0 24.80OS10FSRR/C 36.00 30.400S15STD 35.00 28.000S15R/C 42.00 33.600S20STD 38-00 30.40OS20R/C 46.00 36.61OS25STD 41.00 32.80OS25R/C 49.00 30.200$25F5RR/C 64.00 51.20OS 25FSR STD 57.00 45.600S30STD 46.00 38.400S30R/C 53.00 42.400S35STD 52.00 41.600S3SR/C 56.00 46.40OS40R/C 80.00 64.000S40FSRR/C . . . 95.00 76.000.S45FSHRC 109.00 87-20OSeOFSRR/C . . . 160.00 128.00OS60FGR6.H.R/C .104.00 83:20OS 60 FSR fl /C W/PUMP.

CARB&MUFF. . . . 191.00 152.80

WORLD ENGINES LIST BHC0S60RSRR/C . .142.00113.60OSWANKEL 120.00 96.000S65RSRR/C . . .145.00116.00OS 604 CYCLE 225.00167.50-OS 10R/C MARINE.. . .46.00 36.60OS 21 MARINE 79.00 63.200S20R/CMARINE. . . .55.00 44.000S45RSRMARINE .126.00100.800S90R/C 225.00157.50

SSSAVESS AT BHC!SUPRETIGREX21 SPEED R/CX21CARST 23 sWST 23 R/Cw/mulfST 35 Std . . . .ST 46R/Cw/mulfST.60R/CB.H. .

LIST BHC.70.00 56.0085.00 68.00.36.95 29.60.53.95 43.2053.50 42.0080.0.0 64.0099.95 79.991

WOm.D ENGINES RC SYSTEMSLIST BHC

EXPERT 7 CHAN 2 STICK 4 SERVOS 440.00 259.95EXPERT 7 CHAN 2 STICK 5 SERVOS 465,00 271.95EXPERT 5 CHAN 2 STICK 4 SERVOS 400.00 235.95

CLASSIC MODELS by G«ns Thomas

HEATH HEATH BABY BULLET

u<u-i>c

SUPtS vAPARASOL

PRICES SUBJECT TO CHANGE. RESIDENTS OF NEW YORK STATE AOD 7% FOR SALES TAX. SALE PRICES FOR LIMITEDTIME ONLY. NO C.O.O. POSTAGE-INSURANCE EXTRA-ADO $4.00. WE REFUND ALL EXCESS IN CASK WITH ORDER.ALL INQUIRES ARE ANSWERED IF STAMPED, SELF ADDRESSED ENVELOPE IS ENCLOSEO-NO MORE CATALOGS.

PANAVISEDREMEL LIST BHCmOPRESS 23.95 16.80f2T7 CONTROL 25.95 16.20/219 CONTROL 23.95 16.80

f2217T00LK0L0£R1S.9S 11.20#229 ROUTER 11.95 8.40

• #24ST00LlpiCill 39.95 24.00• #27DTOOLstl«Clll 44.95 27.00<#271 TOOL SpacUl 54.95 33.00<#280 TOOL speciil 54.95 33.00•«81T0QLsp»ctll 64.95 39.00

♦SPECIAL! *#370 TOOL special 54.95 33.00. VtfUbM S(M«j MOTO-TOOL KIT 381

BHC 70.00

1210S16.80

LIST IB 99 LILIST 14.49BHC 15.20BBHC 11.60

LIST 16.49BHC 12.40

LIST 14.49 L SBHC 11.60 BHBHC 10.60

OU 8R0 Champion Mod

S1GS0

#2217J1I.20

'*217618.20

construction and .9 amp motor, 115V 60 Hz ACContains over 30 accessories in carrylsioraoe

LIST 74.95 BHC 44,95 *ipn>ai<#371 TOOL special 64.95 39.00<#360 TOOL special 64.95 39.00<#381T00Lspeclal 74.95 44.95

#S71SHOP100L 79.95 5S.D0#S72SHOPTOOL 99.95 70.60#580 ARBOR SAW 99.95 70.00/702AC'S0RY 20.95 14.70

LEOPARDTANK

SHERMANR/C TANK K T

LISTS156BHC6125 6C

MACCOMBATVEHICLE

LIST 84 98 FOHR CBHC68 00 t'12SCALE

REMO^ALLLIST 24.95 BHC 19.95

ONLY 1Vf>* LONGUNDER 10O2.WT

PORSCHECARLIST 77.98 BHC 62.40

TYHELLCARLIST 77 98 BHC62.4C

TURBO

LIST 59.05 BHC 47.95

NEWSUEVIAMRC READY TO-FLYPLANES ENGINE 379 95

LIST 206.95BHC 19B.K

MRC Cheiokee

^ MRC Cmitm

WEBRA-MRC#102240R/C#I020E1II/C/1034 40R/CF.I.#1Q24E1F.I. SR.#102681R.I. SR. . . .#102340R/CMARINE .#1035 408/0 S8 MARINE#11120 EIH/C MARINE#1025 61R/C F.I. MARINE#1026 61R/C MARINE SR.#1033BIR/Cn0399IR/C MARINESUEVIA2 5H P. ENGINE

BHC84 95

106.3594 95

129 99135.9599.95

110.95135.95144.95149.96145.96165.95199.95

URC SYSTEMS USr BHC/T2ZCH4H "9 95 957855CH4N J49H 22795

MRCAIRPLANES LIST BHCCHEROKEE 499953599SCESSNA 4499532000HAWKTRAINER 10000 7999

40% OFFON ENYA'S

ENTA ENGINES LIST BHCENYA .15RC 48.98 29 40EKYA.19RC 53.98 32 40ENrA .40RC 106.98 64.20CNYA 60 RC Schneurle

234.98 141.00ENYA.OORCBBei 137.98 63.40

SPECIAL ON ABOVE

FOX ENGINES

COMPLETECONTROLL NE K TS

FOX l5SCHNEURLE<S33 32 0aFOX 19 '3 43 30 00 pgiMIwiN*

INCLUDE *4.00 FOR SHIPPING—EXCESS REFUNDED INCASH. SENO,MONEV ORDERS FOR PROMPT SHIPRAENTS-EXTRA FOR AIR & OVERSEAS.

ASTRO FLIGHT list bhcASW 17 89.95 63 08ASWIS 59.95 42 00RF4 44.95 31 50aUSHMASTER 44.9S 31.50ELEGIRAFLY 24.95 17.50MONTEREY 49.98 35.90MALIBU 34.95 24.50MONOCOUPE . 34.95 24.50CALIFORNIAN 69.95 49.00ELECTRATWIN 99.95 79.00

ELECTRONIC SPEEDCONTROL 59.95 42.00

MECHANICAL SPEEDCONTROL 29.95 21 DO

BRIDIK1TS LIST BHCTRAINER 5 24.95 18.75TRAINER 10 27.95 21.90TRAINER 20 34 95 26'.25TRAINER 40 54.95 41.25TRAINER 69 . 62.95 47.25BASIC TRAINER 39

ST 13.49HC 10.90

T 18.49C 14

FUEL PUMPHOT ems TD laoi

o> wax out-L1STJ1095SHCJrse

CUSTOM CRAFTMITER SANDER

LIST 559 95BHC 544.95

DAE POWER PANELSTANDARD S19.00DELUXE 524.9$

ASTRO FLITE STARTERLIST 19.95-RHC514.uO

ALSO NEW "POWERPANEL" AT ONLY

BHC 516.10

DUMASBOATS

ANDPLANES30S OFF FniNGSAt ?0V.-OFF stecuFusT SAVE to

elsCESSNA

IHC OHIT U1 »'^<NOFi$HER

I'h llS-4 CHAN- to. 10 !CHOINES-RETRACTIHO 'WHEELS-STANDSCAU-AIS cm. t(AFLOATS. HACELU-fOAMEO«|AE FAATS- LlOT|ll»«8MC»Jto

.PVAHCEOTRAIHee

AOLi Mil tfto-OME tmFVSE SkOES-OUICIC EASTeONSIAUCTlON-WHEEt

L 1ST S3S.00 e HC t».» wir( parts -

LIST iZi.H BHC S10.D0 BCQIHNE<IS TRAtNCRCi'lStN6INCS-»S' AACA-].] CKAN-S SVi LOS-ALLSHEET WINS-ONE mCEFUSE SIDES-WHEEL PANTSULAAKTS-DiECUT FQAWEOWIIE FtoTS-

_DU-DAO■^LpRCPROP DRIVE

UNfT SHARK COriENav cxjaao

FOR BIG eo POWERRAiact Aftixre LISTS32SCObAIRPLANcS aHCS3fC0DI tRAIHlNCQEAR

U$T 100 00 BHC 69.95 uaoo

SELECTOR HEAT IRON

Hiqh ^Uh IciwFilcli Ktverw Pilch

SCHNEIDER VARIPROP INFLIGHT VARIABLE PITCHPROPELLER FROMSWITZERLANDLtSTS149.95 6HCS114.9Sll'D. WITH2"D. SPINNER NYLONBLADES. ROLLER BEARINGS 4LB.SERVO THRUST REQUIRED.NEARLY 0 TO HIGH.PITCH. WITHREVERSE. ALLOWS PRECISE MANEUVERS. SOLO FOR MUCH MOREELSEWHERE. ADO 51.50 SHIPPINGVIA U P S MONET ORDERS FORPROMPT SHIPMENT.

— GEE BEEs-^oSMALLARD .532,99 FlOAtSJ3* $16.49

ENGINES#B525 61 RC W/MUFF LIST $96.50 BHC 567.50#6535 51 RC W/PUMP/MUFF LI$T 5125.00 BHC $87.50#6712 19 RC CAR/BOAT/PLANE LIST $50.00 BHC 534.9518011 40 RC "75" LIST $72.50 BHC $50.75#8060 40 RC MARINE LIST 562.50 BHC 557.7548360 40 RC Ffl W/PP LIST 5105.90 BHC 573.50#8382 3.See SI OUTBOARD LIST S107.00 BHC $71.90#8364 3.5CC SI MARINE MST 574.00 BHC $51.80#8600 S.BcC F/F OR U/C $95.00 BHC $86.5019120 6.5 R.R. W/MINI PIPE LIST 592.00 BHC 564.40#9130 6.5 R/C F.R. W/MUFF LIST SIIO.OO BHC 577.0049140 6.5 F.R. W/MINI PIPE FF-UC LIST 595.00

BHC $66.5048450 3.5ct F.R.-FF/UC LIST S62.00 BHC $43.4048380 3.5u SI FR W/PERRT CARB & MUFF 572.50

BHC 55B.OO

K&O

$10BHC

B MARINEi^eoxnO

7.00 $74.

ASTRO IB 89.95 63.00ASTRO IS 109.95 77 00ASTR075 129.95 91.00ASTRO .02fF 24.95 17.50ASTRO .02RC 27 95 19.8002TWIN 44.95 31.50OS TWIN 69.95 49.9515 TWIN .145.00 101.5025 TWIN 195.00 136.5010 MARINE 84.95 59.50OS MARINE 39.95 28.00IS MARINE 119.95 84.002SMARINE 129.95 91.00m-START 39.95 28 00H.D.HI-START 44.95 31.60FIELD CHARGER 49.95 35.00RAPIDCHARGER 29.96 21.00ANALT2ERCHARGER42.5a 29.75'/■A STARTER 19.95 14.00ASTRO POWER PANEL 22.95 16.10

.95 30.0015-500 39.95 30.00TWEEDY BIRO 19 39.95 30.00SUNFU 4-20 29.95 22.50QUICKEST 500 42.95 32.25QUICKEST 200 24.95 11.75KAQS"S"40 55.95 42.00KAOS"S"60 59.95 52.50OtRTT B1RDY 40 59.95 45.00DIRTY BIRDY 60 84.95 63.75U.F.O. . . 129.95 97.50P-S1 134.95 T01.25

DUMAS LIST BHCSTARCLASS30 49 00 34.30STAR CLASS 45 120 00 94.009IHG0 . 265.00 195.50EQUATION 172 50 120.75ETCHELLS 22 250.00 175.00EAST COAST 12 METER

2S5.00 185.504S"QUSSSTAR IBB.00 131.60HUSONaB. 170.00119.00

PR09ARDAUNTLESSOV-IOMAHOV-20 PLYDV-40 PLYDV-60 PLTDV-20 OUSSCFDV-40 GLASS CPDV-60 GLASS CPPT109TUNA CLIPPER .FOSS TUGU-76

55.DO 38.5075.00 52 5012.50 10.9032.50 22.7550.00 35.0070.00 49.0092.50 57.75

100.00 70.00.105.00 73.50

41.00 20.79.49.00 34.3090.00 56.0052.50 36.75

$WAMPBUGGV.Iai«a37.0a 25.90HOTSHOT 33.50 23 45PAT-N-PAX 41.00 28.70CGMPDV21 47.00 32.90STAR(GLASS) 186.09 131.60HOT SHOT 21 IGLASSI

. 33.50 50.75AVL-U1 52.50 36.75AMERICAN ENTERPRISE

75.00 52.50USCG WAVERIT LIFEBOAT

(F/Gj 100.00 70.00QUICKIE 40 40.00 28.00LILRASCAL 25.00 17.50LIFEBOAT 44 50.00 42.00

ALL DUMAS IN STOCS KARO-WARE AT 20S OFF • Klls OVER$20.90 AT 30S OFF KITS UNDER$20.00 AT 20K OFF.

GOLDBERG LIST BHCRANGER 42 27.95 22.35FALCON 56 47.95 38.35JR.FALCON 14.95 tl.95SKYURK 56 49.95 39.95

SIG LIST BHCKAOFT . 43.95 35.20KOUGER 52.50 42.00KOMANDER 49.95 40.00KQMH 57.50 45.00CITABRIA 72.50 58.00KLIPFER 25 95 20.75SUPER SPORT 24 50 19.HIP-5t 69.95 56.00CHIPMUNK 99.95 56.00J-3 CUB 49.95 40 00CLIPPED WINO CUB 49.95 40.00SKY80LT8IPE 77.50 62.00CESSNA 150 02.50 66.00RYANSTA 07.95 70.40SMITH MINIPLANE 59.95 48.00LIBERTY SPORT BIPE 79.95 64.00

TOPFLIGHT LIST BHCAIRC06RA 74.95 52.95P-40 74.95 52.95SE5A 74.95 52.95P51 74.95 52.95CONTENDER 56.95 42.95P-47T-B0LT . 95.95 69.95FRESHMAN TRAINER 47.95 33.95CORSAIR. 99.95 72.95

BROWN'S HOBBY CENTER6031 BROADWAY. BRONX. NEW YORK 10471 ONE BLOCK NORTH OF 242nd STREET EL STATION

OPPOSITE VAN CORTLANDT MANSION TELEPHONE (212) 796-542? CLOSED ON WEDNESDAY AND SUNDAY

Engine Clinic CLARENCE LEE

Hallo Clarence!I am a Norwegian model airplane

enthusiast, and my main interest ispattern.

Your column is very helpful, and theonly reason I subscribe to RCM is foryour and Jim Oddino's columns. Therest of the magazine is too full of"Sunday pilot stuff."

■ Well, I have a few problems I wouldlike to have your comments on. The firstisaboutmyO.S. .60FSR. Somepilotsinour club are now using Rossi's, andthey seem to beat my 0. S. It could beinteresting to try to get as much powerout of it as possible. If it fails, I will notneed it anyway. As I understand, themost important thing to do is raising theexhaust port, but how far can I go?Some boat racers I talked with said theyused 170° on their hottest engines. On apattern plane you have to have a fair idletoo, so that is probably too much. I havea Webra Dynamix carb and a Rossituned pipe on my .60 FSR, and I usestraight 80/20 fuel, as nitro Is very hardto get here In Norway. As I canunderstand it, raising the exhaust portwill cause lower compression. Should Ido anything with that?

The other question is about carbonand varnish build-up in our engines. Ithought this was a thing we have to livewith, but I was very surprised one daywhen the following happened: Nlybrother disassembled two of hisengines, and found a big difference incarbon build-up. Both the engines arerun on fuel from the same can, and theyhave nearly the same running time. Bothare used on typical pattern planes andboth are run with tuned pipes. One ofthem, an O.S .40 FSR, had normalcarbon build-up, but the other, a K & B3.5, had nearly no carbon build-up. Canyou explain this? I get carbon andvarnish in all my engines.

Yours sincerely.Per Die Simenstad

Oslo, NorwayPublishing a magazine that will appeal

to all facets of the R/C hobby is not aneasy chore. You have to have a littlesomething for everyone. The scalebuilders would like to see more on scale,the pattern fliers more on pattern ships,etc. However, the majority of the readers

are the Sunday Fliers. Judging by theletters I receive, most fellows readingthe magazine are beginners looking forhelp. So a considerable amount ofmaterial is aimed in their direction.

Competition pattern is a very small partof the overall R/C scene. For everyfellow who enters a contest (pattern)there are hundreds who have no interestin contest flying whatsoever. Don't getme wrong here — I flew competitionpattern myself for about ten years beforebecoming interested in other areas,pylon racing, etc. At any rate, I am gladyou enjoy Engine Clinic and Jim's RadioSpectrum.

If you are going to run a tuned pipe onan engine you will get more of an rpmincrease by raising the exhaust port.This is true only on engines not designedfor pipe use. If the engine is designed forpipe use then you naturally would notwant to raise the exhaust ports anyhigher. 170° of exhaust duration is in linewith good pipe timing. Some fellowshave run even longer duration but thehigher you raise the exhaust the more"peaky" the engine becomes. The rangewhere the pipe "comes on" becomesnarrower and narrower. 170° is gettingjust about maximum for a patternengine. The-higher you raise theexhaust the more critical needle settingbecomes, pipe length becomes morecritical, and idle characteristicsdeteriorate. So, for a pattern engine, youhave to hit a happy medium. I would holdduration down to about 160° myself.

Raising the exhaust port will lowercompression slightly but this is exactlywhat is normally desired. Tuned pipesare actually "supercharging" the engine,i.e., packing in a denser charge ofair/fuel mixture. This results in highercombustion pressure and resultantpower. When supercharging an engine,it is always necessary to lowercompression. This is one of the reasons"Turbocharging" is going to be thecoming thing with automobile engines.Low lead gas and smog requirementshave brought about our present day lowcompression "smog" engines. Theyrespond very well to supercharging orturbocharging.

Normally, if you were using nitro inyour fuel, it is desirable to lower the

compression slightly although very fewfellows do so. Since you are using FAIfuel, which does require highercompression, you may have to raise thecompression slightly.

Carbon in an engine is going to run indirect relation to the amount of fuel used.If an engine is run rich there is going tobe more carbon than if it is run lean. Thisis due to more fuel going through it in agiven period of time. A .40 is going to usealmost twice as much fuel as a 3.5 (.21)in the same period of time so you canexpect more carbon build-up. Somefellows always run their engines on therich side and others always on the leanside. Engines should always be run onthe rich side but there will be a little morecarbon build-up. Your brother may berunning his engine somewhat richerthan you run yours.

Clarence,Just sitting here reading your column

(September RCM) - your answer toDoug Dahlke. I cringe every time youmention 3-in-l oil. I wouldn't even haveany in the house, much less use it on anairplane engine! The darn stuff justoxidizes and evaporates too fast and itsabout the consistency of warm -—Thanks but no thanks. All of my enginesare treated to a good oiling with SOWracing grade mineral oil (Oilzum,Kendall, castrol, etc). The oil has to bemarked racing. Why? Well the racingoils have little or preferably no,detergent. It's the detergents in the oilsthat will attract moisture which is greatfor cleaning while you drive, but lousyfor storage. And after the SOW lube job,a short spray (from a spray can - notaerosol - a pump type can is availablefrom Cudahy for Si.00) to keep exteriorand interior a bit more rust free.

I would almost think that to keep anairplane engine working at peakefficiency, you (besides running an airintake filter) would make the last run ofthe day a short one or two minute just abit over idle speed-type run with a good3-1 mix #50 racing. Oh - a lot - well Iknow Oilzum 40 & 50 racing mineral oilhas a percentage of castor though small-and white/no lead gas. This would bea sure way to cleanse the innards of the

to page 12

10

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ENGINE CLINIC

from page 10

alky, nitre mix. And leave a good mineralbase oil for long time protection.Being a gunsmith, i have a lot of gun

oil around, I buy it by the quart (whichlasts a heck of a long time) and myWD40 by the gallon and I'm still a bitleary of using the gun oils in any engine.They most all have a fairly good siliconecontent, but most are still too darn thinfor model use. To my thoughts, anyway.You wouldn't mix fuel using 3-in-1 oil,would you?As for WD40. Well, my educated

chemical guess is kerosene or one steplighter bodied,, and synthetic oil ofwintergreen. The kero/whateverevaporates and leaves the ersatz oil ofwintergreen to do the rust protecting.It's too light and sparse to use withoutsupplemental lubrication (50 racingmineral).Now as far as dislodged rust

damaging an engine. I think the thingwould have to be awfully darn rusty!Wasn't that jewelers rouge that Foxused to put inside the venturi on the old.35's? Used to help the break-inshorten, without seemingly doing muchdamage to the crank and rod.Even on an aircraft engine, I think you

could double or triple engine life if you

did like the carboys are doing -fit an aircleaner! That air up there is dirty toolAnd how about the dust devils and the

wind blowing the grit in your eye whileyou're standing up. Your plane flies thesame air and aspirates the same dust,much to its engines detriment.

Sincerely,Phil Mahoney

Lime Rock, ConnecticutPhil, I'll grant you that 3-in-1 certainly

leaves a lot to be desired in the way oflubrication and, in general, as an oil.However, as an after-run oil where it isinjected into an engine along with theoil/fuel left in an engine, It does the jobfine. There are other oils of better qualitybut 3-in-1 is easily obtainable in anyhardware, grocery store, etc. Others arenot. I personally prefer a good gun oilsuch as Browning or Hoppe's but theseare not always easily obtainable. Thesmall amount of silicone if any, in theseoils is not going to cause any problem Ifthey are used as an after-run oil. MarvelMystery oil is an excellent after-run oil.Terry Prather makes this availablethrough the hobby shops as his Pratherafter-run oil. Howard Reed's HobbyProducts "OU'R" Is a high grademachine oil and also excellent. All of

these, like 3-ln-1, should be used only asan after-run oil. You would never want to

use them in your fuel for lubrication.As for using SOW racing oil — about

the only time you would want to do this

would be for an engine that was going tobe put in long time storage. If an enginewere disassembled and cleaned with

acetone, lacquerthlnner, etc., lubed withSOW mineral oil and then put in storagethis would be okay. However, this wouldnot be very practical for the guy returningfrom the flying field every week who justneeds to use an additive to keep the oilalready in the engine from turninggummy, hold down rust, etc. AddingSOW racing oil down the venturi andthrough the exhaust certainly would notbe the answer in this application. Youwant a penetrating oil which SOW is not.Flushing the engine out with mineral oiland white gas is not going to work verywell with a glow engine. I don't believeyou have tried to run a glow engine onwhite gas, let alone get it to idle down.Then, too, you would not want to usedissimilar or non-compatible oils in theengine, i.e., mixing mineral oil withcastor oil (vegetable) or a synthetic is nota good idea.

In regards to dislodged rust damagingan engine — you should see some of theengines I get In for repair — you mightbecome a believer --- rust on the

counter-balance and bearing thickenough to be scraped off with a knife.Bear one thing In mind — I repairhundreds of engines a year. I also soldmany thousands so I am not just blowingsmoke when I tell you the damage that

to page 171

12

CARL GOLDBERG

K

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SPAN 41V,'

LENGTH 29'

AREA 419'SQ.IN.

WEIGHT 3V. LBS.

FOR .19 TO.35 ENGINES

and 3 to 4 CHANNEL RADIO

Kit no. 59 (P6-E) $47.95

Curtiss Hawk

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SPAN 56

LENGTH 47"AREASSS 'SQ. IN.

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FOR.30 TO.40 ENGINES

and 4 CHANNEL RADIO

Kit no. 53 (G-21) $52.95

li

The all-time favorite R/C Trainer • more

often sold and loved than any other, because

it's easy building and so gentle to fly.

SPAN 56

LENGTH 47'/,"AREA 558"SQ.IN.

WEIGHT 3V4T0 4y.LBS.

FOR .19 TO .40 ENGINES

Kit no. 50 (G-15) $49.95

CARL GOLDBERG MODELS, INC.1

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AVAILABLE IN CANADA

CLASSIC CUSTOMNow available in Kit form

Slow Roll-

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RF MeterProgram Switch

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roial

TRANSMITTER FEATURES

• Programming Switch:This switch controls servo travel and sensitivity of the Aileron,Elevator, and Rudder Channels. The programming switch hasthree positions, full travel linear, half travel linear, full travelnon-linear, and simultaneously affects the three flight controls.When the switch is in the front position, servo travel is full (±50")and linear. When in the center position, servo travel is one halfnormal throw and linear. When in the back position servo travel isfull and non-linear.

In the non-linear position, 213 stick travel produces approximately112 servo travel and the last 113 of the stick travel produces theother 112 of the servo travel. This means you have very insensitivecontrol around neutral but you can still get full servo travel whenyou need it.

• Slow Roll Switch:When the switch handle is toward the center of the transmitter

case, maximum Aileron travel and sensitivity is controlled by theprogramming switch. When the slow roll switch Is toward theoutside edge of the transmitter case, maximum Aileron travel iscontrolled by the linear slide pot. In actual operation, you set thelinear slide pot to produce the correct roll rate for your airplanewhen the stick is held full over.

• Servo Reversing:The four main flight controls plus gear retract and flap servotravel can be reversed In the back of the transmitter case. Each

control is on a three pin plug. To reverse the servo, you unplugthe corresponding control and rotate the plug 180° and plug itback in. The trims are also reversed by rotating the appropriatethree pin plug.

• Linear Trim Controls:Our linear trim control gives an expanded resolution feel on thetrims and provides an excellent visual indication of trim position.Your transmitter can be set up with cross trim or standard trimand is determined by where the trim control is plugged in.

*OPTIONAL FEATURES:

• Low Speed Throttle Trim:The throttle trim lever only affects the throttle servo position whenthe throttle control is in or near the idle position. The throttle trimlever has no effect on the full throttle servo position. When thisfeature is installed you cannot reverse the throttle trim control inthe Transmitter.

On-OffCharge Receptacle

• Twin Engine Throttle:Channel 3 and channel 6 respond to the throttle stick positionallowing separate servos for each engine. Independent throttletrims are also provided.

AIRBORNE FEATURES

• Receiver:

Double tuned Front End F.E.T Mixer; Low currentdrain.

• Servos:

RS-4; RS-5; RS150; KPS-14; **KPS-15n:***Chevron.

• Dual Charger:Provides separate or simultaneous chargingovernight {14 hours)• Airborne Pack:

500 Flat; 500 Square; 550 Flat;

Tech Custom System (Metal Gimbals) $325.00Transmitter Kit (Metal Gimbals) $189.95Royal Classic Factory Assembled System $550.00

•Adder Option

Low Speed Trim $ 2.00Twin Throttle $ 4.00

••Adder for KPS-15 I! Servo Mechanics ......$ 5,00 Ea. Servo•••Adder for Chevron Servo Mechanics $30.00 Ea. Servo

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1 22

SHEETS 36" 46"1116x2 |10PK| 2.7S3132 1 2 ' |1Q PK) 3.36 _

116 I 2 |1Q PK) 36S

114 I 2 no PK| 4.SS-

1116 >3 nOPK) 3.0S 4.10

3132 > 3 (10 PK) 3.66 4.91

116 X 3 nOPK) 4.66 6.133116 I 3 I 5PK) 2.66 3.43114 < 3 [.5PK1 2.66 3.633/6 > 3 I SPK) 3.64 4.90

1/2x3 t SPK] 4.64 6.11

1/18x4 nOPK) 4.86 6.633/32 I 4 I SPKl 2.94 3.961/6x4 I SPKl 3.36 4.663/16x4 1 SPK) 3.68 6.221/4 X 4 t SPKl 4,27 5.75

BALSA STICKS 36"

1/16 a 114 130 PK] 2.21

3/32 a 114 130 PK) 2.301/6 a 1/4 (30 PK) 2.391/6 SO (30 PKj 1.863/16 SO (30 PK| 2.391/4 SO (30 PK| 3.661/4 a 3/8 (30 PK] 3.991/4 a 1/2 (30 PK| 4.37

BODY SIDES 42"

3/32 a 4 1 4PK| 2.94

1/8 a 4 ( 4 PK| 4.233/16 I 4 ( 4 PKj 4.60

1/4 a 4 [ 4 PK) 4.74

WINO SHEETING 30"1/16 a 3 (10 PK] 2 66

3/32 a 3 (10 PK] 3.05

1/6 I 3 (10 PK] 3.85

1/16 a 4 (10 PK] 4.04

3/32 a 4 [10 PK] 4.84

1/6 a 4 f SPK] 280

BALSA SLOCKS 36"

1 a 2 1.061 a 3 1.62

1 a 4 2.262 a 2 I.S2

2 a 3 2.27

BIRCH PLYWOOD 48"

1/32 a 6 1 2PK] 3.48

1/16 a 6 1 2PK] 3.79

3/32 I 6 1 2PK] 4.39

1/6x6 1 2 PK] 4.49

3/16 I 6 1 2PK1 4.49

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R/CM PRODUCT REVIEWS:

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Sundou FliefK EN WILLARD

Sunday fliers come in all shapesand sizes — big and small, fatand thin, young and old, and

everywhere in-between. So do theirairplanes — and this past month hasbeen an adventure in contrasts for me

that I'd like to share with you.Nowadays the great trend is towards

the monster machines. I'd say QuarterScale, but so many of them are getting tobe 1/3 Scale (like the Byron PittsSpecial) that the term monster scaleseems more appropriate.

Wally Rinker and Dick Hershey with theirSupermarine S-5.

"Big is beautiful!" That's the claim.And I don't dispute it one bit. Take a lookat Photo No. 1 and you'll see why I agreethat big is beautiful. All sixty pounds of it!

But wait a minute. Let's not gooverboard. "Good things come in smallpackages," Is an old saying. So, if big Isbeautiful, let me tell you that small Isexquisite. You want proof? Look atPhoto No. 2. All 15 ounces of it!

Courtney Bryant's 112A scale Citabria.

Here's the story behind these twobeautiful and exquisite scale models.

The Citabria CaperA few weeks ago, Courtney Bryant, a

schoolteacher and avid modeler,

showed up at the Pioneers/P.A.L. R/CSkyport with his just completed scalemodel of the Citabria, powered with aCox .051 with a sleeve throttle, and

guided by a Cannon super-mini brickwith rudder, elevator, and enginecontrol. Courtney had carefully matchedthe sleeve throttle to the barrel, gettingone that was a little too tight, and thenlapping it to fit. It is one of the finestoperating sleeve throttles I've seen,since the leakage was minimal and thelow end of the speed range was quitereliable as a result.

As you can see from the photo, thereis little dihedral in the wing, which led tosome question as to the turning ability,since there are no ailerons. Well, thatquestion was answered in a verypositive way on the first test flight. Towatch that little Citabria make turns

would convince anyone who didn't knowbetter that it must have ailerons. And the

slow rolls were equally impressive. Snaprolls were just that — snappy! And thespin rate was almost a blur, but justneutralizing the rudder brought theplane out of the spin In less than a turn.

It was my great pleasure to put the firsttest flight on Courtney's Citabria, andseveral more after that. And I'll tell youthis: I've had some very exciting testflights — from a 7V2 oz. peanut scaleSE-5 to a 340 pound RPV for Lockheed

and I'll rank the first flight ofCourtney's little Citabria right up therewith the others when it came to thrills

and satisfaction.

So all of you Sunday filers who are abit awed by the giant scale jobs that areappearing, take a look at Photo No. 3.

The Clear Lake CaperAt a recent 1/4 Scale fly-in at Morgan

Hill, there were some truly beautifulscale models. One attractive example of"personalizing" a kit was Stan Powell'sNavy trainer version of the ConsolidatedFleet Biplane. Stan took a Concept kit,modified the fin and rudder, added aspeed ring, and there was the Navyprimary trainer, sitting on the line withstudent and instructor, ready for theday's flying lesson. Take a look at PhotoNo. 4 --- a great example ofindividualizing a kit.

Stan Powell's Consolidated Fleet HuskyNavy Trainer.

But now look at Photo No. 5. You're

looking at the winner for best pilot in thefly-in. No, not the lady — she's Mrs.Ralph Walker, and she's smilingbecause the pilot's In Ralph's Stearmanwere outfitted by her, and they won FirstPlace for best scale pilots. What with thebig monster scale models being judgedfor scale appearance. It makes sense tojudge the pilots as well. Nothing looksmore unrealistic than to see a nice scale

job flying along with an empty cockpit.

Courtney Bryant admires his creation, aswell he should.

There's a Sunday filer who likes themsmall, and is rightfully proud of his littlecreation. You can be too, if you like themsmall. I do.

Mrs. Ralph Walker and her prize winningscale pilots.

There were other excellent models

there, but the one that drew the mostattention didn't fly, it was only on display.One reason it didn't fly was that it is a

15

seaplane: another was that it wasn'tquite finished. And a third reason wasthat it exceeds the AMA weight limit of 40pounds and, therefore, could not fly in anAMA sanctioned event.

The model I'm referring to is, ofcourse, the fantastic Supermarine S-5Schneider Cup racer. It was built by ateam of Sunday fliers who live inLakeport, California, on the shores ofClear Lake. Wally Rinker, who lives at320 17th St., Lakeport, Calif. 95453,says he sort of headed up the team; DickHershey did most of the structuraldesign, and Lee Jackson was calledupon to do the welding of the fittings.

Just seeing the model on display wasso intriguing that I decided I had to seethe first test flight, and learn more aboutit. So, I conned Wally into delaying thetest flight until I could get up to ClearLake. He agreed to do so ™ although Idid learn that he cheated just a teeny bitand did a high speed taxi before theofficial test flight, and during the taxi it didlift off about 6". '"Shucks," he said when Italked with him, "I didn't want all thosepeople showing up without at leastknowing that it would taxi!"The Clear Lake caper began on

Friday, September 7. Together with myfriend, and student R/C pilot. KenWathen, we drove up and arrivedaround three in the afternoon. Wallycame over and picked us up at the motel,then drove us over to Moe Curry'shouse. Moe's another Sunday flier wholikes seaplanes, and has the facilities tofly them --- landing dock, launchplatform, and three retrieval boats. Heloaned one -- a Kayot — to us, and wewent fishing for the rest of the afternoon.Don't ask.

In the evening we talked about theupcoming test flight of the S-5. Here'ssome of the background.

Wally, and his friends Dick and Lee,started the model a little before

Christmas 1978. They got the plans froma small three-view which was publishedsome time ago in RCM, and Dickenlarged them to yield a wing span of9'1" — about a few inches less than one

third scale.

The structural design presented manyproblems, but Dick Hershey haddesigned several full scale aircraft, andput his expertise to good use. The S-5

has fully functional rigging, and the floatstructure uses aluminum weldingswhich virtually duplicate the full scaleplane. Take a look at Photo No. 6; noterigging and welds, and you'll see what Imean. And inside, all surfaces are cablecontrolled --- no pushrods. Formaximum efficiency, the servos aremounted in front of the surfaces, andlong leads go to the receiver. Chokesare installed in the leads to avoid

reduction in range. Wally uses a Litcoreceiver, with EWH heavy duty servos,and a Kraft transmitter.

The engine is a twelve horsepowerHuska-Varna chainsaw engine. Wallypicked it up from a guy who accidentallydropped a tree on it; paid forty bucks forit, and hoped it would work, it did, soWally thought he might get another for aspare. He went to a dealer, and thedealer said, "Sure, I can get you just theengine for $610.00! How many do youwant?"

"Think I'll make do with what I got,"said Wally. And he did, and it worksperfectly. One thing — in order to start it,they rigged up a Ford starter. No wayyou could start it by hand.When the model was all finished and

ready to fly, it weighed 58 pounds. But intalking to Wally, I found that he had abalance point at 33% of the chord. Forsafety, I suggested he ballast it to put theCG at 30%. He did; it took three poundsof lead in the nose of the floats!

So at 61 pounds, the wing loading isjust about four pounds per square foot.The power loading about five poundsper horsepower.

Ken Willard with Wally Rinker and theSupermarine S-5

Battered tip of Supermarine's propeller atend of test flight.

The props are hand carved fromlaminated alder, then fiberglassed. Evenso, the water spray really chewed themup. Take a look at Photo No. 7. That'sthe forward edge of the prop tip followingthe test flight. Next time Wally plans tohave either brass or stainless steelplates on the tips. Even with spray railson the inside chine of the floats, watergets up to the prop.So there's most of the particulars

about this most unusual model.

Interesting sidelight; after shooting thebreeze, my friend Ken Wathen and Iwent over to the Rainbow Lodge fordinner ™ recommended to us by all themodelers as the best in town — and I can

believe it, the food was great. We weresitting there and Bill Bentley, the host,gave us his welcome spiel, corny butgood corn, and I mentioned that we werethere to observe the test flight of a

model. Without hesitation he said "WallyRinker's?"

"Yes," I replied, "how did you know?""Heck. The whole town has seen it in

the window of his shop!" Talk about acommunity enterprise. It seems that allLakeport was giving Wally moralsupport.So, after a fine dinner, we went back

and sacked out, and the next morningwe got up and went over to Moe Curry'slanding to watch the test flight.Everybody and his kid brother wasthere.

It took about an hour for Wally, Dickand Lee to put the S-5 together.Meanwhile, Chuck Connors, a retiredhelicopter pilot, put in a flight with his halfsize Wavemaster. and Moe Curry put hisPBY Catalina together — that's Moe andhis pride in Photo No. 8. It is one of themost popular designs we've had inRCM.

Moe Curry and his Catalina PBY from RCMplans.

At last the S-5 was ready. Dick startedthe Huska-Varna with the Ford Starter,Wally checked the surface actions andengine control, and everything was inorder. Carefully, they lifted the modelfrom the dock and placed it alongside inthe water. The engine was ticking oversmoothly, and Wally guided the modelout away from the shore. We got into theKayot and slowly cruised out into thetake-off area.

The model was a bit touchy on watercontrol. The water rudder is hinged so itcomes up out of the water when thespeed picks up, so taxi speed has to beslow. But Wally got it lined up and starteda take-off. About half way along the line,a wave caused by a passing water skierhit the floats and made the model do aslight waterloop. (Why, when a lake istwenty miles long, do water skiers haveto do their thing in front of the only modelseaplane dock on the lake?) So, Wallythrottled back, taxied back to the take-offrun spot, and started over.

This time the take-off was right out ofthe textbook. About twenty yards atdisplacement speed, then up on thestep, gathering speed and, after about ahundred yard run, lift-off! It was like ascene from the Schneider Cup Races.As the plane flew around, traffic stoppedon the lakeside road to watch.

to page 171

16

THE 18-WHEELER

hit tiiis bahy inyoupdp'iveway!Or on your patio! Or In your kitchen!

And have a barrel of fun while youtest your driving skill!

This is Pro-Clsion's fabulous radio-

controlled 18-Wheeler — a 22 inch longscale model of a customized Peterbilt. This

is the one that created a furor in the worldof radio controlled vehicles — the one that

enables you to hitch and unhitch tractorand trailer on command by remote control!

It comes complete with a steering wheeltransmitter. Make precise right and leftturns with ease. Drive forward or In reverse

or stop on a dime. You are definitely in thedriver's seat!

Thousands of these 18-Wheelers havebeen bought by teamsters — men whodrive the real thing cross country. Theyknow it takes real skill to back one of thesebabies Into a tight parking space, unhitchthe trailer then come back later and pickit up!

Visit your toy or hobby dealer and ask fora demonstration of Pro-Cision's famous18-Wheeler or its sister truck, the SuperTanker. Write to us for a catalog. They sellfor a dollar but hurry and we'll send youone free!

Sheu

THE SUPER TANKER

1979 The THH Coipotalior, Pro Cision Division

PRO-CISION, 6501 FLOTILLA, DEPT. RC, LOS ANGELES, CA, 90040 IN CANADA: 6010 AMBLER DRIVE, MISSISSAUGA, ONTARIO L4W2B1

y

AMKE YOURMODEL SNAZZY IN ONLY 5 MINUTES:

JUST PRESS ON COVERITE'SNEW

GRAPHICS!WILL NOTCRACK OR PEEL

GREAT FOR PLANES,BOATS & CARS

Graphics are made of 100% cast vinyl.Glass-smooth yet micro-thin. Unlike thetypical mylar or water transfer decal,Graphics will not crack, peel or harden.

GOOF-PROOFADHESIVEGraphics have a special pressure-sensitive adhesive that gives you time tocorrect mistakes. During the first hour orso, the adhesive sets up slowly, allowingyou to lift and re-position. This goof-prooffeature plus a simple alignment systemmakes it easy to produce perfect resultsevery time. Ask your dealer to show youthe Graphics Pak—the alignmentsystem is on the back.

AMAZINGLY FUELPROOFWe all know how annoying it is to havefuel creep under a decal, causing theedges to curl up, and sometimes have thedecal fall off. Graphics simply don't dothat. See for yourself. Dip Graphics inraw fuel. Let it sit around for a few days,dripping wet. You'll be amazed to seethat Graphics will still stick tight likenothing ever happened. Incidentally, noovercoating is ever required. Graphicsare ready to go, right out of the wrapper.

A WORD ABOUTPAINTINGSome guys like to have numbers that area different color than the 3 basicGraphics colors (red, white or black).Graphics can be painted. But not withbutyrate dopes, lacquers or epoxies. Werecommend Aerogloss, R&S, or

Pressure-sensitive numbers &letters that are perfectly die-cut. Theonly ones made of 100% cast vinyl.That means total fuel & weather

resistance.

ONE INCH COSTS 5C PER NUMBER

TWO INCH COSTSlie PER NUMBER

THREE INCH

COSTS 20CPER NUMBER

polyurethane's like Formula U. Be sureand do a test, anyway. And keep in mindthat when you paint, the resiliency ofGraphics will be only as great as the paintitself. Without paint, Graphics will standup to almost anything, including all butthe worst types of scuffing.

THE COVERITE LINE—Permagioss Coverite. IOC*, polyester iron on covering. Prepainted. 38" x437 43" X 15 feel/ 5" x 36"/ Red, white, blue, yellow, orange, aluminum, olive,day^oworange, dayglowyellow, black. Super Coverite. Same material as Permagloss. but not painted. 38" x47"/47'x 15 feet/Red. white, blue, yellow, orange, hi vizredand antique fabric. Quickstik. 1/2 pint & pint cansof iron-onadhesive. Silkspun Coverite. lOCt. spun polyester that looks like tissue. Unpainied. 38" x 54"/ 38' *25 feet/ Red, white, blue, yellow, orange. Balsarlle. 1/2 pint & full pint cans of wood conditioner.Glaskote. 1/2 pint cansof clear, fuelproof, final coal. Pirn cansof thinner. Trimlt. Micro sharp knivesfor cutting all coverings. Graphics, Ttie only letters & numbers made of micro-thin viiiyl. Die cut,pressure sensitive, totally fuelproof. 1". 2" or 3"/ Red. white or black

COVEFIUE420 BABYLON ROAD, HORSHAM, PENNSYLVANIA 19044

Coverite products are distributed world wide: Australia, Belgium. Canada, Denmark. England, Finland,France. Germany, Holland, Italy, Japan, New Zealand. Norway, South Africa, Sweden, Switzerland,United Slates.

Graphics add a professional touch to anymodel, including older ones. You'll bequite pleased to see the reaction at thefield when you show up with an old planethat's been dressed up with crisp, newGraphics on it. Graphics stick to justabout anything: fabric, painted surfaces,plastics, metal, wood, etc. Naturally,they look great on Coverite (Permagloss,Super & Silkspun) as well as all the otheriron-ons. Since they're water andweather resistant, they're now beingused on full sized boats (hulls & sails) andfull sized planes (3" letters are FAAapproved for tails). Not to mention signs,doors, windows, trucks, vans, etc.

STICK TO ANY CURVEOnce again, unlike traditional decals,Graphics remain pliable. Not only willthey conform to any curve or angle...they will stay that way! Just press themon and forget about them, they'll stay inplace for years, indoors or out, in all sortsof weather.

DIG ECONOMICAL

SHEETSSome modelers have asked us why wepackaged sheets instead of individualnumbers. The reason is that it is cheaperto produce a full sheet than individuallypackaged numbers. Each Graphicspackage contains 28 characters: twofull sets of numbers and AMA letters,plus N&C. Also a little extra blank spacefor you to cut out your own. Packaged insheets, 1" Graphics cost less than 54 pernumber; 2" Graphics cost less than 114per number; 3" Graphics cost less than204 per number.

New For

1980:

Full AlphabetFrom A to Z

Send a stamped envelope for your copyof the Black Baron's latest tip sheet 21LVoys to Make Finishtng Easier,

A sport scale Taylorcraft is the latest kit offering fromMicro-X Products, P.O. Box 1063-D, Lorain, Ohio44055. It is designed to be powered by 1/2A size

engines and is priced at $26.95.Contained in a sturdy 30" x 6V2" x 3" box that is adorned with

a full color label showing the actual finish model, the contentsare packaged in a neat and orderly fashion. The Micro-XTaylorcraft is a kit that will, upon inspection, "bring back fondmemories" to all older modelers. Primarily of the built-up "sticktype" construction, this kit even features "printwood" balsaparts, although the wing ribs are die-cut in the conventionalfashion. The thoughts of O.F.F. club members (that's OverForty Flyers . . . sonny!) will drift back to the by-gone era ofLePages glue, nitrate dope, balky ignition engines, and razorblade mutilated fingers, when viewing this kit. The Micro-XTaylorcraft is pure nostalgia!Construction:

The 25" X 38" plan sheet is well drawn and the wood qualityis good, although we felt the top fuselage cowl block was veryhard. It is a kit that can be built with as much (or as little) detailas the builder wishes to put into it. All assembly instructionsare contained upon the plan sheet and, while construction isrelatively simple, some aspects of assembly are rather vague.For example, the wheel pants which are of several balsalaminations are flared into the balsa landing gear leg fairings.The wheels are shown encased within the pants. Yet noinformation is provided pertinent to this assembly sequence.This is, perhaps, a small point that will not present a problemfor the experienced builder. The relative newcomer will find aninformational void such as this to be rather perplexing. Noradio system installation information is provided. Any builderwith a few kits to his credit will not have any difficulty Inassembling this kit. The builder who is expecting highlydetailed, step-by-step assembly instructions will be

SPECIFICATIONS

Name TAYLORCRAFTAircraft Type Stand-Off ScaleManufactured By Micro X

P.O. Box 1Q63-D

Loraln, Otilo 44055Mfg. Suggested Retail Price $26.95Available From Both Mfg. & Retail OutletsWing Span 36 InchesWing Chord 5% InchesTotal Wing Area 200 Square InchesFuselage Length ZAVi InchesStabilizer Span IS InchesTotal Stab Area 50 Square InchesMfg. Rec. Engine Range 049Recommended Fuel Tank Size 2 OunceRecommended No. of Channels 2 or 3Recommended Control Functions Rud., Elev., optional Throt.Basic Materials Used In Construction:

Fuselage Balsa & PlyWing BalsaTall Surfaces Balsa

Building Instructions on Plan Sheets YesInstruction Manual NoConstruction Photos No

RCM PROTOTYPE

Radio Used Westporl Int'l VariantEngine Make & Disp Cox TO .049Tank Size Used 2 Oz.Weight, Ready To Fly '. 20 OuncesWing Loading 14.4 Oz./Sq. Ft.

SUMMARY

WE LIKED THE:

Overall finished appearance.

WE DIDN'T LIKE THE:

All plywood parts were missing. Balsa die-cutting only average.Nose block (balsa) extremely hard. Assembly information lackingon plan sheet.

disappointed. The die-cutting of the wing ribs was average assome ribs had to be lightly cut to remove them from the sheetblanks. The balsa "printwood" is clear and sharp and the woodquality is excellent. The wing is of conventional spar and ribconstruction and the fuselage sides and tail surfaces are builtdirectly over the plan sheet in the traditional manner. The partsfit is very good and the hardware package we would rate asbeing average. Custom Model Products "Fast Bond"cyanoacrylate glue was used for assembly of our test model.This greatly hastened the construction process and keptadhesive weight build-up to an absolute minimum. We alsoelected to mount the wing to the fuselage with nylon bolts, as itseemed a shame to use rubber bands and dowels on a scaleaircraft. This was a personal preference only.Covering:Our test model was covered with Hobby Lobby's Superkote

film type covering, over the open structures. This was lightlywet sanded to remove the gloss and provide for betteradhesion for the K & B Super Poxy enamel which was thensprayed onto the aircraft. The model may be finished with justfilm covering, however, we prefer the look of a satin enamelfinish to a glossy one, on this type of scale type aircraft. Thismethod keeps the additional weight, associated with a paintedfinish, to a minimum.

to page 169

19

FOUR FABULOUS FOAM-WING FUN FLIERSCOMBINING THE CONVENIENCE OF A READY-TO-USE MOLDED FOAM WINGWITH THE STRENGTH AND RESILENCE OF A BALSA FUSELAGE AND TAIL

scnmp

KIT RC-45

2 OR 3 CHANNELDesigned by MIKE GRETZ *24.50

• FUT-BOTTOMED MOLDED FOAM WING• BUILT-UP BALSA FUSELAGE• SHEET BALSA TAIL SURFACES• ROOM FOR STANDARD SIZE RADIOS

For .09 to .15 Engines45" Wing Span290 Sq. In. Wing Area

Printed Fuselage Sides -Build Directly on the WoodDie-Cut Plywood Formers

and Doublers

Formed Aluminum Main Landing GearAluminum Motor Mounts

Nylon Control HornsTuf-Steel RC Links

Threaded Control RodsMolded Hinges

Illustrated Instruction BookScrews, Blind Nuts andOther Small Hardware

RC-37 SUPER SPORT . . . $24.50 RC-36 KLIPPER $25.95 RC-43 COLT $25.95

COMPACT PERFORMERS — IDEAL FOR SMALL FIELDS

LEARN TO FLY RC THE SIG WAY

STEP 1 - BASIC : START WITH A STABLE HIGH-WING MODELModelers often want to start in RC with, a good-looking pattern or scale modelthat is complicated to build, has a high wing loading and flies fast. This is a mistake and never works out. First attempts with radio control should be with aninherently stable design having a flat-bottomed airfoil that gives the studentpilot time to think and develop automatic reactions. The Kadet, which will fly handsoff, is ideal for this purpose. Many club instructors and hobby dealers have toldus that two or three check-out flights on a Kadet are sufficient to allow a studentto practice fly and learn without constant attention from an instructor. And weknow of modelers in isolated areas, with no one to help them, who have taughtthemselves to fly with the Kadet.

We recommend that the novice b^in his training program by using rudder controlfor first flights and later on switch to aileron control. Ailerons are supplied in thekit for 4 channel use but the model can also be flown on 2 or 3 channels and

rudder control if the builder does not have 4 channel radio equipment. A specialbooklet is included in the kit to help the student pilot make his first radio flights.

Before you can accomplish your dream of darting around the sky with a sleekP-51, you must have some RC flying time on your log book. The word on themodeling grapevine is that our boxy buddy, the dependable Kadet, is the bestchoice. It's THE standard trainer—nationwide!

BALSA RIB WING

Designed by CLAUDE McCULLOUGH

LENGTH; 42 In.

WING SPAN: 57 In.WEIGHT: 4 Lbs.

ENGINES: .19-.40Cu. In.

FOR 3 CHANNEL RC EQUIPMENT

$43.95 ^SIG^KIT RC-31

KIT NOW INCLUDES MATERIALS AND INSTRUCTIONS FOR AILERONS

STEP 2 - INTERMEDIATE: PROGRESS TO FASTER SHOULDER WING DESIGNSBALSA RIB CONSTRUCTION WING FEATURING BUILT-IN WASHOUT LARGER SIZED MODEL - FOAM CORE WING WITH BUILT-IN WASHOUT

WING SPAN: 55-1/2

ENGINES: .29-.40KIT RC-32

WING SPAN: 62 In.LENGTH: 44 In.

WEIGHT: 5-1/2 Lbs.

ENGINES: .40-.50 Cu. In.

$49.95 $49.95 KOMANDERDesigned by CLAUDE McCULLOUGH

When the student pilot feels secure flying the Kadet and can handle it capably, he is ready totake the next step. The Kavalier has a special wing design, calculated to make this transition easier. The precise amount of incidence change required to help eliminate tip stall isautomatically incorporated as the wing is built in the usual way on a flat surface. In additionto this aid to stability, differential movement aileron horns are furnished in the kit, providingless down and more up travel on the ailerons. Adverse yaw In turns is reduced by thissimple method and controllability of the model is greatly improved. Find out what smoothflying really is with the Kavalier.

STEP 3 - ADVANCED:MOVE UP TO LOW WING AEROBATICS

FOAM CORE WING WITH WASHOUT

S.AiR FORCE

Designed by CLAUDE McCULLOUGH

Specially designed for novice RCers who want to move up from simpler models or preferto start with an aileron controlled airplane. The built-in stability, coupled with goodmaneuvering and aerobatic ability, allows rank amateurs and low-time fliers to do a creditable job. Piloting boners that would clobber other airplanes are readily forgiven by theKomander. It will fly right down to the full stalling point without snap rolling or falling offon a wing- This enables slowed down, nose-high landings to be made. Coupled with theshock absorbing qualities ot the wing mounted gear, the superior ground handling characteristics make this a tine performer from rough or grass fields.

STEP 4 - EXPERTtGRADUATE TO COMPETITION FLYING

FOAM CORE WING

KIT RC-29

B MRA ENGINES: .40 to .50■ ■ ■ ■ Bs MM Hm

■ WING AREA: 550 Sq. In.

Designed by CLAUDE McCULLOUGH LENGTH. 45-1/2 In.After some flying time on the Kadet, Kavalier and Komander, the student will be ready for thissleek stunter. The Kougar is a carefully tailored design that will do every stunt in the book-even the lomcevak - and yet is not difficult for low-time pilots to handle. The wash-outincorporated into the foam wing allows the model to be slowed down to a walk for the landing approach and flared onto the runway in a main-gear first touchdown without unduestalling or snap rolling tendencies. The large amount of wing area for the 51" span keepsthe wing loading low and'aids handling characteristics. The Kougar Is highly recommendedas an Introduction to low-wing flying and AMA pattern competition.

WEIGHT: 6-1/2 - 7 Lbs.ENGINES: .45-.60Cu. In.

WING SPAN: 67 In.

Balsa Skin Plywood Skin

$57i0 $62.95

KOMETDesigned by MAXEY HESTER

In the Komet, Maxey Hester has created a pattern ship that meets the requirements of themost demanding competition flying, yet is equally at home at a Sunday afternoon sportflying session. As in the Kougar, construction Is speeded and appearance improved by aformed plastic top made from ABS plastic that is easy to glue and easy to paint. It carriesno load and serves only as a streamlined fairing on top of the rugged balsa box fuselage.Featuring a foam core wing, this big kit takes only a short time longer to build than one ofthe so-called ARF (almost ready-to-fly) types and results in a durable aircraft with lowerwing loading and higher flight performance, at a lower cost.

See your dealer first! To order direct, odd $1 postage under $10, postage free over $10. No C.O.D.Send $2.00 for latest catalog of kits , accessories and supplies by SIG and. other major companies.

SIG MANUFACTURING CO Montezumo, Iowa 50171

SoQflnQ. ^ALJ<INDRICj^

AS most of us are graduallyprogressing up the LSF ladder,we begin to think about those

long slope, distance and thermal flights.Fliers who have achieved these taskssay they have done so by using largerbatteries, however, they never say whyand what cells to use.

Dave Register who is a personal flyingfriend, scientist, leader member of thePasadena Soaring Society, editor oftheir fine newsletter, contest director, isan all around learned gentleman when itcomes to aeronautics and electronics.

Dave has put some words together thattells us the why's, and what's of usingalkaline cells for extended flights."Ah, springtime — and a young man's

fancy goes to thoughts of Level V slopeflights? Well, if you're either that old, orthat young, then this review may help.Personally I'd rather go out and ogle a bitbut for now we'll try to get 'a charge' outof this little battery article."The problem you've got with either

the Level IV or Level V slope flights (orany long duration attempt) is that astandard .5 ah nicad pack isn't good formuch over 3.5 hours. If you're going for 4hours you can get awfully antsysweating out that last 1/2 hour, Whatmost pilots do is switch over to alkalinebatteries for the attempt. The questionthen is, which battery size is enough andhow much insurance have you got?"The first thing is to determine how

much current your flight pack requires.(You can always clip your transmitter toany old humungous batteries and parkthem on the ground.) It turns out thatboth my Kraft and Futaba 3 channeldraws about 250 ma with all threeservos in continuous motion (installed ina sailplane). Obviously you don't fly likethat so a safe upper limit to the averagecurrent draw of a 2 or 3 channel flightpack is probably 125 ma."Next question: When do you

consider an alkaline cell to be dead? Thedischarge curve for these batteries islong and flat without the characteristicsharp turn down of a nicad battery. Thecriterion one might best apply in thiscase is that many receivers use TTL IC'swhich don't like to run much below 41/2volts. That gives 1.1 volt per cell cut-offfor the alkalines which Is, coincldentally,the same as for the nicads."The project is now well defined.

Dave Register launches his AmericanEagle with flaps. Extensive flightchracteristics testing with the use of flapshave been a long time project of Dave's.

Simply take an assortment of alkalinecell sizes, slap a 10 ohm resistoron each(this gives an average current drain of125 ma during the discharge time) andsee how long it takes the battery to dropto 1.1 volt. Although this isn't exactly thesame as the momentary current surgesprovided by your servos, it will give areasonable approximation to the timeyou may expect from this type of cell."The results are summarized in Table

I and a few obvious conclusions can bedrawn, First, using D cells is atremendous over-kill unless you plan onflying for two days straight or plan onstalling your servos a lot. AA cells maybe fine for fun flying but for the 8 hoursslope flying they're calling it a bit close. Ifyou're the daring type and want to usethem, don't do any flying with thembefore your attempt. C cells seem to bejust right or, if you can't get thesemonsters in your ship, use two parallelAA packs to get the extra capacity.Unlike nicads, alkalines don't mindbeing paralleled. The last entry in thetable is the measured volume of thesebatteries. It's interesitng to note thatcapacity scales almost exactly withvolume.

"Another important consideration instrapping up your alkaline pack forduration is soldering wires to thebatteries. Spring clips aren't very high inmy book as they tend to develop contact

resistance at the most embarassingtimes. However, soldering to alkalinescan be a bit tricky, but it can be done witha few simple precautions.

First, don't use a soldering gun, thewattage is much too high. A solderingpencil of about 40-60 watts seems justright. The lower wattage (15-25) unitsdon't quite have the capacity, whileanything over 75 watts will probably frythe cell. Next, take a jeweler's file andscrape off a small area on each end ofthe battery for the solder joint. File firmlyenough to remove the surface platingbut not enough to remove the entiresurface. Dab these areas with a smallamount of resin flux (available at anyhardware or electronic's store), Do notuse acid flux. Quickly heat these areaswith the pencil Iron while simultaneouslyholding the solder to the battery contact.Do not use silver solder. Any good resincore solder recommended for

electronics work will be fine. Within asecond or two a small shiny blob ofsolder will adhere to the battery.Preparing the surfaces in this way iscalled 'tinning.' Tin all the batterycontacts and the ends of the wires.Then, without using any additionalsolder or flux, solder the wires to thebatteries, but don't leave the solderingiron on the batteries for more than a fewseconds. Practice on some old batteriesuntil you can reliably produce a goodtight joint."And there you have it, a beautifully

soldered-up pack that will safely get youthrough your Level V flight, I personallyprefer the C cell set-up as it's easier todamage the AA cells because of theirsmaller size. And whatever you do, don'teconomize and use non-alkalinebatteries. Today's IC servos requireshort but heavy current drains and onlyalkaline and nicad cells have lowenough internal resistance to meet thisrequirement."

Table 1

BatterySize

D cell

C cell

AA cell

DischargeTime

57 hours

30,5 hours

6.5 hours

Volume

2.16 in3

1,08 in3

.29 in3

Thank you Dave for a job well done, Ihope it will help you, the pilot, on thoselong flights.

to page 168

22

[L[L1[E1¥

$129" Value

4-Channel

' 25-40 Size

• 53" Wingspan

• 20-22 oz. Loading

• Very Aerobatic

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6 MODELS TO CHOOSE FROM

;© °[F[LV □ □ o Tr®H)/^w★ The Cardinal is ready for your engine and

radio, after approximately 45 minutes reassembly time, out of the shipping carton.

★ Balsa tail and stabilizer are covered, hingedand ready to go on the airplane.

★ Control horns, pushrods, throttle and steering, motor mounts, wheels and steeringarms are installed on applicable models.

★ Balsa sheeted foam core wing is covered,hinged and joined for immediate use.

★ Tortoise shell constructed fuselage isroomy, durable and unbelievably strong. Itis made of our specially reinforced RSTPplastic material with wood firewall and landing gear reinforcement.

★ Four channel operation features rudder,elevator, throttle, aileron and steerablenose wheel. No building!

★ Dealer inquires invited — please use your letterhead ★

Send Me (Na)Kansas residents add sales tax

Name^

Address

City

.Model Price

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Acct. No.^ ExpiresPRICES SUBJECT TO CHANGE W/OUT NOTICE - NO C.O.Ds

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BYRON ^ORIGINALS',/'

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Quick-Build

Exact Scale

Less than one year ago, Byron Originals Introduced ItsPitts Special with optional Byro-Drive reduction unit. Wemade some pretty strong product claims and were morethan ready to back them up. We have since learned, fromactual applications by customers both in this country andoverseas, that the Pitts and drive unit have far exceededour own ratings. Whether It be packaging, overall parts fit,ease of assembly, fidelity to scale, flight performance,materials quality, overall appeal or completeness, thesefirsts from Byron Originals have firmly established a newstandard of excellence for the entire modeling industry.

No one will agree more than the proud and satlsifiedPitts and Byro-Drive owner. He'll be the first to recommend a Byron Originals kit for your next project. And youcan count on him giving you a long list of reasons why.We suggest you take his advise and look to Byron

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Precision puHeys-designed andmatched for peakperformance.

tlghtenerioffers easyadjustment foroptimum performance andextended belt

Factory Direct Price

Prop. & Spinner Inc.

20 X 8 mapleprop and 3Vi"spinner includedwith Byro-Drive.

Tensiometer indicates exactrecommendedbelt tension forpeak performance and beltlongevity.

Poly-Flex* V-belts-proven after years of tool

shop applicationsrequiring up to20.000 rpms.

The Proven withOrder Bvro-DriuA mnH(>l numhiarOrder Byro-Drive model number

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MFR-10- .60 & .65 O.S.

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RR-11- .61 & .65 Rossi,rear valve

RF-12- .61 & .65 Rossi,front valve

WFR-14- .61 speed Webra,frt. & r. valve

TFR-13- X.60 Supertigre,frt. valve, r.

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78-'?9 SCALE KITOF THE YEAR

Wing Span;68"Wing Area:1400 sq.in.

Length: 62"

Factory Direct Price

Send mc Puts Kitis) at $212.95 ca. plus $12.00 shipping & handling.

Pibcrglassing kills) at $39.00 ca. plus $2.50 shipping

Byro-Drivels) Model No. _(See chart at left) at $98.50 ea.

plus $2.50 shipping. Foreign InquiriesMlg-15 kills) at $168.00 ea. plus $8.00 shipping contact:Fiberglassing kills) at $22.50 ca. plus $2.50 shipping f7835 Sky Par'k^(:frcle

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—1 have enclosed check or money order for $Please charge to Master Charge or Visa Account.

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$212.95

Weight: reedy-to-fly, l^^fuel.* Under 1 5 lbs. winTCconokote finish.★ Under 1 7 lbs. with Epoxy/Fiberglass

finish.(Prices subject to change without notice)Send to: Byron Originals. P.O. Box 279, Ida Grove, Iowa 51445. Ph. 712-364-3165

Includes ALL ITEMS toKits... complete models as shown!

Engine, radio, and final paint not included

BYRON

ORIGINALS

Wing Span - 57"Lenght - 55"Ready-to-fiy wt. • 814 lbs. ^Wing area - 600 sq. inches ^For .60 size engines and 4 channel radio

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having to remove and assemble hatches.• Eliminates complicated belt-start

procedures• Readily accepts most standard .60 size

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• Arrives factory installed (standardequipment) and ready for engine.

• Produces up to SVi lbs. of static thrustwith Schnuerle .60 and low nitro fuel.

MIG-15

Quick AssemblyScale Accuracy

Easy Access to Radio and Engine

With factory installed

BBYRON ORIGINALS ■yrpjet

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-.-m

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Unlike other quick-build kits that often sacrifice authenticdetail for fast assembly, Byron Originals has kept bothauthenticity and simplicity high on the priority list. All die-cutwood parts and 11 foam components needed for completionare designed with quick assembly, scale accuracy andminimized weight In mind. All foam modules consist of lightweight yet impact resistant injection molded polystyrene.

Fuselage consists of hand-layed fiberglass and arrives withfan unit, thrust tube, radio compartment and push rods alreadyInstalled. All decals and color scheme templates also included.

All control surfaces utilize center point hinging requiringstandard servos. Every last item, except radio, engine and finalpaint are included in kit. No shaping or carving required. Noguesswork involved. Only quick, accurate and enjoyablebuilding.

Optional epoxy/fiberglass kit for glassing wings and tail surfaces available for $22.50.

The ducted fan with exclusivequick-start capabilities.

Starter extension provided with kit

Add $8.00 for

shippir^g to anyU.S. address. Items

shipped by UnitedParcel Service.

$168.00Factory Direct Price

1/2-A, SPORT, STAND-OFF SCALE, FOR 2 CHANNEL RADIO

P-39 AIRACOBRA • Span 36 in. • Area 216 sq. in. • Length 28.5 in.• Weight 22-28 oz, • Engine TD ,049• Wing loading 14.6-18.6 oz./sq. ft. 34.95

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PIETENPOL SKY SCOUT ('/j-A PETE) • Span 42 in.• Area 284 sq. in. • Length 26 in. .Weight 22-27 oz.• Engine QRC .049 • Wing loading 11-14 oz./sq. ft. 26.95

P-47 THUNDERBOLT • Span 36 in.. Area 216 sq. in.. Length 28.5 in.. Weight 22-28 oz. • Engine TD ,049• Wing loading 14.6-18.6 oz./sq. ft. 34.95

ME-109E • Span 36 in. • Area 216 sq. in. • Length 28.5 in,• Weight 22-28 oz. • Engine TD .049. Wing loading 14.6-18.6 oz./sq. ft. 34.95

P-51D MUSTANG • Span 36 in. • Area 216 sq. in. • Length 28.5 in• Weight 22-28 oz. • Engine TD .049• Wing loading 14,6-18.6 oz./sq. ft. 34.95

CHIPMUNK • Span 36 in. • Area 216sq. in, • Length 28.5 in• Weight 22-28 oz. • Engine TD .049• Wing loading 14.6-18.6 oz./sq. ft. 34.95

BEECHCRAFT BONANZA • Span 36 in. • Area 216 sq. in.• Length 28.5 in. .Weight 22-28 oz. . Engine TD .049• Wing loading 14.6-18.6 oz./sq. ft. 34.95

House of Balsa makes modeling f unl

ViA. Scale ¥2 the work ~ 14 the time " 14 the priceSee your local dealer first. Distributor and dealer inquiries invited.California residents add 6% sales tax.Foreign orders — U.S. currency on U.S. bank only.

20134 State Road ■Cerritos, OA 90701" Phone: (213) 850-1276

House of Balsa

i

iCQle Yieuus- CUAUDE McCULLOUGH

NEW SCALE RULES FOR 1980-81

The Scale Contest Board hascompleted the two year cycleof receiving, modifying and

voting on rule proposals made by AMAmembers. On the Final Vote, thefollowing main features wereincorporated into the regulations;(1) Accepting the proposal made by

Dave Piahn, a new event for Giant Scalemodels was established. Several

competing proposals to increase theweight and engine size limits andinclude large models in the regular SportScale event were defeated. The new

Giant class is not restricted to 1/4 Scalebut will be for all types of models toolarge to be entered in Sport Scale.Entries in Giant must fit one or more of

these categories: (a) Powered by anengine of more than 1.25 cu. in.displacement: (b) Made to a scale of2Vb" = 1' or larger; and (c) Weigh morethan 15 lbs., less fuel. (20 lbs. formulti-engine).These requirements were adopted to

avoid having "orphan" models, too largefor one event and too small for the other.

There will be a few airplanes that will beeligible for both the Sport Scale andGiant events. (Example: 3" scale,powered by a .60 prop driver andweighing 143/d lbs.). But a betterdefinition that would allow full

development of the Giant idea withoutsome overlap between the two classescould not be found. To prevent this dualeligibility from causing operationalproblems at contests, the owner of aborderline model must decide which of

the events he will enter. He may notenter both Sport and Giant events at anyone meet with the same model.

However, different models could beentered in Sport Scale and Giant, as wellas a third in Precision Scale, as long asthey meet the requirements of theindividual events. Incidentally, if aContest Director so specifies on hissanction application and all contestpre-publicity, he may hold an eventlimited to 1/4 Scale models only, just ashe may do the same for multi-enginemodels, military models, civilian modelsof a certain period, etc.

After considerable discussion, the

Ted White's Martin-Baker MB-5. One of the

fastest designs of WWII but didn't go intoproduction.

Board decided to adopt the 40 lb.maximum weight recommended by theQuarter Scale Association of America

and previously established by theExecutive Council as the top weight forAMA insurance coverage. The QSAAhad also recommended that 4

horsepower be established as a limit onengine size. But since the Board saw nopractical way of measuring horsepower,providing an agency for the job andkeeping information current, for thepresent a maximum limit of 3.66 cu. in.was passed. 40 pound airplanes musthave adequate power to fly safely butanyone planning to undertake theexpensive development of a hugeSchneurle ported nitro-fueled beast,with horsepower far in excess of 4,should pause and consider that atanytime, under the Safety andEmergency provisions of the ContestBoard Procedures, restrictions otherthan the stated cubic inch limit can beput in force at once if necessary, to keepextreme examples of excess power outof the competition picture. The large limit

Dan Parsons, designer of the ModelMerchant kit, flew this MB-5, also got hit bythe judges for fast flying.

is intended to encourage use of gas orno-nitro alcohol fueled power of lowersophistication and reasonable cost,perhaps modifications of enginesalready in production for other uses.One interesting feature of the Giant

event proposed by Plahn is the increasein static score (as compared to SportScale) to 40-40-40 or 120 total and theflight score to 120 by addition of twomaneuvers. The Sport Scale event hastoo many ties and .1 point edges soperhaps this increase in point span willwork out a little better. It will be an

interesting experiment at any rate.Otherwise the procedures in the Giantevent are the same as the present SportScale event.

(2) The Sport Scale event (but notGiant) will be divided into Sportsmanand Expert classes, as proposed by ArtJohnson. A system much like that inPattern or the 78-79 Precision Scale

rules will be applied to move fliers up intoExpert after they have become winnersin Sportsman. At th^ same time, theclassification system for Precision Scalewill be dropped due to lack of use. Therereally are only experts left in thePrecision anyway and aspirants to jointhe ranks can be recruited from the

Expert Sport Scale fliers.(3) The matter of the importance or

non-importance of "small details" thathave been the cause of some

discontent, pro and con, in scale rankshas been dealt with in two ways. First,the radius of the judging circle has beenincreased to 15' (John Prestonproposal) for both Sport and Giant. Thisputs fine stuff farther away from thejudges where they can't see it, whichshould please those who are anti-detail.Second, since the detailing is not sonoticeable a factor, the arguments aboutjust exactly what "deemed not visible inflight" means can stop, for most of thisproblem passage has been dropped.(Proposed by John Preston and ArtJohnson.) And that should please thosewho like to put an extra finishing touch ortwo on their models and, in fact, havebeen doing it all along. As is the casewith most compromises, nobody may besatisfied, but among competition fliers,what else is new?

to page 30

27

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SCALE VIEWS

from page 27

(4) Brian Crossley's proposal tochange the ratio of the scoring and makeflying 2/3 of the points and static 1/3 ofthe points did not receive support andwas defeated. My own opinion is thatSport Scale is already stronglyflight-oriented under the present 50-50split. There is nothing wrong with that,but also nothing there to indicate a needfor further change In favor of flight points.It is already very difficult for a biplane orhigh wing monoplane to get anywhereagainst the heavy artillery that can bedelivered by WW II and other low wingtypes. Scale would become anotherpattern event with a few highly aerobatictypes predominating under a 2/3-1/3set-up.(5) John Preston's Judges Guide for

Sport and Precision Scale Flying hasbeen adopted for the rule book. As wehave seen from arguments over judgingat the Nats and other meets, thereprobably never will be any completeuniformity in this complicated job. But atleast there will now be a standard thatcan be revised if experience shows thisis indicated.

(6) An event for Sport ScaleSailplanes has been established on theoriginal proposal of Gordon Pearsonwhich, subsequently, was considerablymodified by acceptance ofcross-proposals from John Preston andBob Karlsson.

A number of other proposals werealso passed. Favorable votes weregiven to the mandatory use of scale pilotfigures (by Bil l Northrop andMcCullough), though a waiver will begranted to any models built prior to 1980that would have to be damaged to gainaccess to the cabin or cockpit. Twomechanical options changes (from DaleArvin) won. They will be limited to three,not including the multi-engine option.Those mechanical options difficult tosee In the air will be demonstrated to thejudges on the ground, after which theywill be used during the flight in ascale-like manner and at appropriatetimes in the pattern but need not beoperated on the regular or special fly-by.Presumably the flier can do a specialfly-by if he feels that this will be of help tothe judges, but he will not be required to.MORE NATIONALS PROTESTSI noted last month the Builder of The

Model rule protest against the ByronOriginals Pitts. Since then, two moreprotests have been filed, both mainlyconcerned with the emphasis that NatsScale Contest Director Dale Arvin andthe flight judges put on scale speedimpression.Ted White says in his protest that

judging scale speed by direct proportionto the size is incorrect. "... a P-51

Mustang which weighs about 10,000ibs. loaded, would have to weigh 1675lbs as a 1 /6 scale model. Now that would

make my Martin-Baker (about 1 /6 scale)have to weigh 2,000 ibs ... a modelairplane weighing a ton! It Is ridiculous toexpect a 55" model airplane to flyexactly 1/6 the speed of the realairplane." He went on to make othercomparisons of size, including the Cub."Following the criteria established by theNationals officials, you would have tofigure that because the real J-3 stalls ataround 40 mph and flies at 65-70 mph,then 1 /6 scale model (according to directproportion speed) has to take-off atunder 7 mph and fly at 10-12 mph. Thisis far out of line, but this is the figuringmethod used by the officials at theNats." He asked that the U.S. Teamselection at the Nats be voided and a

new competition be scheduled to pickteams.

Larry Jensen, who flew a BeechcraftBonanza at the Nats, also protested thescale speed impression idea, statingthat smaller models must fly faster thanlarger versions because the air in whichthey fly cannot be scaled down, a modelflying at low speed just above a stalllooks bad and is hazardous. "It is

impossible to scale down the air in whichthese airplanes must fiy. To judge a.scale airplane's 'realism in flight' morethan 2 points off for too much scaleimpression speed is wrong per the rulebook, There are 5 different things to beconsidered. That would be 2 points pereach item adding to a total of 10." Heobjected to use of USPJA pattern judges(as did White), to the wide difference insome scores (his example: 9-8-4), thedirect interference of the C.D. in markingscores and the static judges beingshown the bottoms of the models.

I am inclined to agree that the scalespeed matter may have beenover-emphasized at the Nats. Theproblem here is that this is a matter ofjudgment that is not spelled out in therule book and, thus, can be interpreteddifferently by different judges. You maynot agree with the approach, but is notreally forbidden by the rules. And can westate every judgment decision in the rulebook?

In general, I also agree with many ofthe comments made by Larry and Tedabout the practical considerationsinvolved in fast and slow flying. If we areto have a scale event that encourageswide diversity in choices of subjects,then narrow approaches of any kindmust be avoided.

But I have to part company with themin several areas. First, there is noexpressed or implied idea in the SportScale rules that the bottoms of themodels are "off limits" to judges. Thebottom is the most visible in flight and issubject to the same requirements forscale as the side and top views. TheScale Board has previously allowed the

use of elevated tables and the 1980

book will eliminate ambiguity about this™ it will be stated that the judges maylook at the bottoms of the models. Last,but not least, I'm the first to wish thatthere was an organization cailed theU.S. Scale Judges Association, butthere is none. Someone had to do the

task and the USPJA volunteers

undertook it — a hard and thankless

assignment. They are probably used tounhappy contestants but it is a littlemuch to expect them to also be faultedas "incompetent." Remember that theywere briefed and directed by Scalepeople.

THE OTHER SIDE

OF THE COIN

The modeling grapevine, anextensive communications network,having spread the reports of the protestsand disagreements, many who weren'tthere have gotten the idea that Scale atLincoln was a catastrophe. "I hear it wasa really nasty Nats," said one call.Hardly, You couldn't have asked for amuch better flying site and efficientcontest operation. To balance theprotests about scale speed, there wereothers who thought it was high time for acrackdown. One contestant (who did notplace) said it was the best Nationals hehas ever attended. A letter the other dayremarked, "Nats were fun and DaleArvin did a terrific job." One thing shouidbe kept in mind. The Nats are not reailyoperated by "the AMA." The Nats arepossibie because the local modelingclub and anybody they can shanghai,plus enthusiastic modei builders from allover the country (this year, evenHawaii), used their vacation time to workiong hours in the sun. It's "us" that'sdoing it, not "them." So if you thinkimprovements can be made, volunteerto help with them or bring some friends.And maybe just a little understanding forthose who are doing their best to copewith a complicated event.

SCALE BOOKSHELF

Air Force Colors, Vol. 1,1926-1942by Dana Bell. 96 pages.Squadron/Signal Publications, 1115Crowley Drive. Carrollton, TX 75006.$7.95 plus 50 cents postage. There area lot of aviation history books out that arenothing but rehashes of worn outmaterial. This certainly cannot be said ofthis well-done collection of color and

markings during a fascinating period ofto page 167

30

Choose thc^^^way you trainwith Top FIHe's

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along with its fantastic pattern handling rriake theContender the real workhorse of our aerialdemonstration. I heartily recommend this greatTop Flite kit to anyone who wants to experiencethe ultimate in performance and stability all inone easy to build package."

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S I G

iy VInce Micchia Photos By Ron Harris

A GENTLE AEROBATIC SPORT SHIP THAT WILL DO THEPATTERN, THE STING TIED FOR SECOND PLACE IN THE RCM

1979 DESIGN CONTEST

Ouick and easy is the name ofthe game today. Quick to buildand easy to fly. Well, if that's

what you're looking for, search no more,as The Sting is here at last.

This design has been bugging me forabout a year now, so the decision wasmade to put it on paper and try it out. Ihope you like it enough to try it yourself.

After spending some time on thedrawing board, the pencil lines werecompleted at last. The purpose In mindwas to keep The Sting as simple as

32

possible and still maintain semi-modernlines.

The airfoil used is the same that wasused on the SST 40 which is kitted byHobby Shack. The control surfaces ofThe Sting are generous enough to havefull control of the model even at very lowspeeds. The overall construction of TheSting has been kept simple with nodifficult planking or carving. The Stingtips the scales at five pounds and, for a.40 powered model with the wing area ofover 600 square inches, leaves the

power loading in the low numbers.After spending some time at the local

hobby shop, buying up some of thematerials needed to start construction, Icouldn't wait to get back to the shop tostart The Sting. I'm sure many buildershave felt the same when starting a newmodel.

That evening much to my surprise thefuselage was practically finished. I findone of the best methods of cutting outparts, when building from plans. Is totrace the parts on tracing paper or

Bottom of The Sting showing 118" baisa doublers, top springers,and hardwood servo rails. Note 318" trianguiar strip shown justforward of servo rali, shown on plan but not described in text.

118" X 114" stringers cemented in place. Bevel sand two 118" balsastrips and cement them to the three top stringers fo support thedorsal fin. Cement the stringer to the center marks on F-8.

Tall blocks sanded to shape to conform with fuse/age andstringers. Note offset on tail block to clear 114" dia. dowel elevatorjoiner.

Bottom view showing rear wing-hold down blocks and 116" x 114'bottom stringer.

Front end of The Sting showing the dash block. Motor mount setat 45 degree angle bolted in place with 4-40 machine screws. Afotecut out area on nose ring for top cowl.

Tank compartment showing Goldberg nylon bearing block andgroove to clear steering arm.

velum. Cut the part from the paperleaving 116" to 1/4" margin from the part.Cement the paper to the wood withrubber cement. Cut the part out, removethe paper, and wipe the part clean. Therubber cement will peel right off easily.Two weeks later, working two or three

hours an evening. The Sting wasfinished. So here we sit writing an articleof the events that took place, and howThe Sting goes together. As of thiswriting The Sting has been test flown

and a few photos taken of it.The first day we tested The Sting,

there was no wind blowing, so the timewas ideal. We did a distance check

which really wasn't necessary since thereceiver had been used before. The

K & B .40, with a Top Flite 10/6 prop upfront, was started. First off, to get rid ofthe jitters, The Sting and I did someground handling. I got it to the far end ofthe field and made ready for take-off.

I was again surprised in what little time

it took for The Sting to get airborne. Iwould say 25 to 30 feet and The Stingwas up and away. After flying It atmoderate speed for the usual two orthree laps around the flying site, the timehad come to put it to work. First a verylarge loop was tried at full power all theway around. If the wing was going to go,I'll know at the bottom. I also checked for

flutter — there was none. Next we did a

roil. It rolls well, but you will have to use alittle rudder when the wing Is vertical on

33

3/e'x1'LEADING EDGE USE LEADING EDGE FOR PQAM WING

IM'xI/TBALSA

SPARS TOP &

BOTTOM3/32"BALSA

LEADING EDGESHEET TOP &

BOTTOM DOUBLERS 3/32''BALSA

WEBBING

3/32"*1/4"CAPSTRtPS TOP &

BOTTOM

3/16'SO. BALSA

TOP BBCTTTOM3/4 x1/2"HARD

WOOD LANONOGEAR MOUNT

3/16"* S/S"BALSA I.E. CAP 3/32-Ji 1V4- TflAJLINSEDGE TOP & BOTTOM

Dl'BAO LARGE HINGES

AILERON HORN &BEARING

5/6> M/2 'BALSA STRIP AILERONSOLID TIP OPTIONAL (SEE OTHER UP)

DIHEDRAL BRACE N0.3OIHEDI

NYLON NOSE WHEEL BEARJNGAND STEERING ARM

TRIANGLE1/4-* 3/6 'HARDWOOD

RAILS 1/B-BALSA OOUBLER

BOTTOM

ALL BOTTOM SHEETS

BOTTOM COWL BLOCKMAKE 2 FROM 5/6BALSA

TANK FLOORDRILL AND TAP FOR 1/4-20AFTER WING IS FITTED TOFUSELAGE ^ all

DASH SLOCKOPTlCNALWINDSHIELD UNE

STOCK K.B.40R/C

k3/6'HARD wood RAILS2 V2'0IA. OCH.OBERG

SPINNER

RECEIVERp.l ENGINEPUSH ROD

RUDDER 6.

ELEVATOR

MOTORSERVO

SULLIVAN FUEL

TANK NO. SSe-439 3/8-TRrANGLE STOCK— AILERON HORNS

1/2 3/4- HARDWOODWfNG MOUNT

AILERONSERVO

F-1A

3/32-BALSA FLOORX

1/4 .20 NYLON

BOLTSB.K.E.ENGINEMOUNT 40

TEEL STRAPS3/6'BALSA

6/32'DIA .WIRE3/6-TRIANGLE STOCK t/2-K3/4"HARDWOOD L/G

MOUNTP*1 3/16 'PLYWOOD

F-2 1/6" PLYWOOD \

&/32"OIAWIRE GEAR

2' WHEEL BALSA

2l/2-WH£ELS-^

F-5

1/6"PLYWOOD

F-6

MAKE FROM

1/6-BALSA

A#THROTTLE PUSH ROD HOLEB •MOUNTING HOLES FOR SLANTED ENGINE

UP RIGHT0»PUEL TANK HOLESE'NOSE BEARING MOUNTING HOLES

A* WING MOUTING HOLE

both ends of the roll. Cuban Eights weredone with no problems at all. Inside andoutside loops — no problems. I went upfor spins and got a spiral dive, so morethrow was added to the rudder after thefirst flight. There is no problem Inspinning now.

In inverted flight, The Sting hangsright in there. Now that the fuel must begetting low. The Sting was made readyfor landing. I throttled back but not quick

enough, as I over-shot the field and hadto go around again. Thistime the landingwas just about as good as can be seenanywhere. The Sting was flown a fewmore hours, with no dings or brokenprops. As far as I'm concerned that wasthe end of a perfect day. I am very proudof The Sting and I know if you decide tobuild it, you will be too. So all you guysand gals out there in the modeler'sworld, let's get to the shop and build this

thing called The Sting. This model isintended for the modeler who has flownfour channel high wing trainers, and hassome experience flying. The Sting is anadvanced trainer. Now that we have

come this far, read on, as theinstructions are next.

Fuselage Construction:Shown above the side view on the

plan is the bottom view of The Sting. Forthose who have never built a low wing

34

FULL SIZE PLANS & TEMPLATES AVAILABLE — SEE PAGE 187

WING TIP PARTSMAKE 2 OF EACH FROM 1/6" BALSA

TYPICAL WIN© SECTION

BUILT UP

FOAM CORE

PATTERN

CUT TIPS FROM A' TO 'B' 3/16'BALSA

1/16-PLyWOOO BOTTOM ONLY BUILD UP WITH SCRAP

ALL RIBS ARE ^/32'"BALSA5/32-D)A. L/G WIRE MAKE 2

DIHEDRAL BRACE N0.2

ALL OrHEDRAU BRACES

ARE 1/fi" PLYWOOD

MAIN RIBS 14 REQOTTOM STRINGER

' LANDING GEAR RIBS 0 REQD.

DIHEDRAL 1-1/4'UNDERLAST TIP RIB EACH WING.

DOUBUER RIBS 4RE0DV3r PLY.

D/A-xl- BALSA

BLOCKSRS ARE 1/e'x 1/4'BALSA

S/ie'BALSARUOCCR

CENTER RIBS 2 REQO

WING SmN 56'

WING AREA 637 SO.INSLENGTH 46-

WEIGHT S LBS.POWER .40-46 TANK PLDOR

3/12''fiALSAHINGE LOCATION

1/e-x 1/4-CENTER

BOTTOM STRINGER

3/32-BALSA BOTTOM (CROSS GRAIN)

1/4x3/0" BALSA

NYLON ELEVATOR

HORNEL AGE SIDES

16-x4- MEO. BALSA

DOUBLEHS MAKE TWO FROM 1/0" BALSA

F-6T

i/B-BALSA HEAD REST

1/2" BALSA

F-2T MAKE TWO FROM 3/16'BALSA

CEMENT TO TOP OF FUSE. SIDE 1-1/2" FROM FRONT

THE STINGF-4

1/8'BALSA

^IwN BY IviNCE MICCHIAI INKEDBT IviNCE MCCHAF-1A MAKE TWO

POSITION OF HEAD REST

PLAN NO. 783

before, this view will assist you when thetime comes for servo installation.

Begin by cutting the fuselage sidesout of 3/16" X 4" X 42" balsa. (Save thescrap for rudder and fin later.) Mark thelocation of the bulkheads with a soft lead

pencil or ballpoint pen. From 3/16" balsamake two F-2T and cement them to the

top front edge of the fuselage, and allowroom for the dash block to be cemented

there later. Cut the firewall (F-1) from

3/16" plywood. The drilling instructionsare just below it on the plans. You maychoose the method here as to uprightengine or 45 degree slanted. If slantedengine is to be used, the bottom blind nuton the back side of the firewall will have

to be Inset so as not to interfere with the

front landing gear bearing block. Afterdrilling all necessary holes in the firewall,cut F-2 and F-3 from 1/8" plywood. Tapethe rear end of the fuselage sides

together, making sure that they won'tslip, and that they are square and evenwith each other. So keep your eye onthat as you cement parts between thefuselage halves.Cement the firewall in place with

5-minute epoxy and wipe the insidecorners of excess cement since 3/8"triangular strips are to be cemented inlater. Cement F-2 and F-3 in place next.Cut 3/8" triangular strips and cut a

35

K & B .40engineinplace. And an inside shot of the cowl. Note twogrooves cut on top edge of the bottom cowl block for screwdriver,to remove engine mounting screws.

Cowl in place and is hinged on the left side. Cowl has to beopened for refueling.

Completed tail assembly. The fin Is cemented into the top of thetall block after the spacer has been removed. The "V" cut on thefront of the stab is cemented to stab mount.

Built up wing tip Is optional. Prototype used solid tips and foamcore wing.

groove for steering arm clearance onone of the triangular strips and cementthem in place. Cut two 3/8" triangularstrips to fit along both sides of thefuselage bottom and to fit from F-1 to F-2as shown on the side view. Cut two F-1 Aparts from 3/32 or 1/8" balsa and cementthem to each side of the fuselage'sinterior, just to the top edge of the 3/8"triangular strips. This is the base for thetank floor.

Cut the rest of the bulkheads from 1 /8"

balsa. Cement F-6 and F-7 together andforget the top pieces for now. F-4 iscemented in place next. The fuselagesides may have to be pulled together atthis point. I used masking tape here andit worked fine. Cut and cement tank flooras per plan. The tank floor will slip intothe tank compartment from the top andis cemented to the top edges of F-1 A.Take the tape off the rear of the

fuselage and sand to shape as perbottom view, or so that both of the

fuselage sides (when cementedtogether) are 3/16" thick. See bottomview at rudder hinge point. Cement therear of the fuselage together evenly atthe back edge and squarely across thetop. Cement F-8 in place. Cement F-5T,F-6T, and F-7T in place. Cut F-3 from1/2" balsa. If you don't have 1/2" balsa,laminate two 1/4" sheets together. Plankthe flat portion of F-2T as shown on theplan. This is planked half way so you can

to page 158

THE STING

Designed By : Vince Mlcchia

TYPE AIRCRAFTSport & Advanced Trainer

WINGSPAN58 Inches

WING CHORD11 Inches

TOTAL WING AREA637 Square InchesWING LOCATION

Low WingAIRFOIL

Semi-SymmetricalWINGPLANFORMConstant Chord

DIHEDRAL. EACH TIPIV4 inches

O.A. FUSELAGE LENGTH48 inches

RADIO COMPARTMENT AREA(L)10"x(W) 2%"x(H)3"

STABILIZER SPAN

23 Vz inches

STABILIZER CHORD (Incl. elev.)SVa" Average

STABILIZER AREA

140 Square inchesSTAB AIRFOIL SECTION

Fiat

STABILIZER LOCATION

Mid-Fuselage^ VERTICAL FIN HEIGHT

8 inches

VERTICAL FIN WIDTH (Inc. rudder)6V4" Average

REC. ENGINE SIZE

.40 Cu. In.

FUEL TANK SIZE8 Ounces "

LANDING GEAR

TricycleREC. NO. OF CHANNELS

4

CONTROL FUNCTIONSRud., Elev., Ail.,Throt.

BASIC MATERIALS USED IN CONSTRUCTIONFuselage Baisa and PiyWing Balsa and Piy (or Foam)Empennage BalsaWeight Ready-To-Fly 80 OuncesWing Loading ISOr/Sq.Ft.

SILENT POWERBY JIM ZAREMBSKi

Every RC'er has fond memoriesof past succeses in buildingand flying his or her miniature

aircraft. I personally have a clear pictureetched in my mind of the maiden flight ofmy first multi motor electric poweredaircraft. This bird was called Wren. It had

a wing span of 44" and sported a TwinAstro 020 power system with a CannonTini Twin providing the control response.On a dead calm balmy summer

evening I tested the radio with the 020'shum|ning and gave the Wren a tosswhen everything was checked out. I wasestatic as the Wren climbed to cruisingaltitude. At 200' I turned the Wren 180"

and flew back over the flight line. Thesound of an electric twin is justphenomenal. You hear the motorsscreaming in the background but whatreally stands out Is the whir of the twinpropellers carrying the model across thesky.

Since that time I have built three

additional twins — all powered by theAstro 05 twin system. These included aPartenavia P68 from the Astro Flight kitand two of my own designs —Sweepstake I and Sweepstake II. Trulythe electric twin is a sight to behold in theair and, yet, in addition to flightaesthetics, these models are extremelypractical.One of the major drawbacks of glow

powered muiti engine models is failureof one engine on take-off which leads toan abrupt end of the flight. This isobviously remedied in an electric multisystem since both motors are wiredparallel to the same power source. Theystart and stop together. Another benefitis instant starting of all motors with theflick of a switch. Finally, the noisecompared to glow engines is sonegligible that schoolyard flying of thesemodels is practical.So why haven't more twin electrics

been built and why have some of theones that have been built been onlymarginally successful?The answer to the first question is

simple. IVIodeiers feel that an electrictwin system such as the Astro 05 Twin istoo heavy and not powerful enough.After all, a fellow in a club two cities overthe mountain tried to fly a Partenavia(P-68) and it didn't perform! Bunk!

Every unsuccessful attempt I haveseen in twin motored electrics has

occurred because of the builder and/or

flyer's selection of wrong propellers orextreme lengthening of power wires tothe motors.

For the Astro 05 Twin, a Cox Gray 6/4prop is by far the best choice for a sportmodel. For a twin powered sailplane, theCox 7/3y2 prop is good. However, the7IZV2 propeller has been dropped from

Stand-Ofi Sca/e Tw/n 020 powered AeroCommander.

Twin 020 powered Aero Commander.

Bob Miller with P-68 and Super Monterey.Note fairing behind canopy on Monterey.

John Scrary's P-68 from Astro Flight kit. 5channel, rudder, elevator, aileron, motorand flaps.

Stand way back ME 262 Twin OS's.

Jim Zarembski's Sweepstake twin 05. 54oz., 74" wingspan, 580 sq. inches of wingarea. A Floater.

the Cox line. A Rev-Up 7/4 has proven tobe a good replacement.

Rick Witte, a fellow member of theToledo Weak Signals, had only limitedsuccess in the 1978 flying season withan Astro Flight P68 with twin 05's. Hewas flying with 5/4 propellers. The mereswitch to 6/4's took the P-68 from a dogto a real crowd pleasef. Roils, loops, and

to page 152

CONNECTERbik.

red

bIk.

CNARCERECEPTACLE

MOTOR

MOTOR

RATTERY

Typical wiring schematic— twin motors.

37

RC

FLYING

AND THE

LAWPart XII

WARNINGS AND SAFETY

INSTRUCTIONS.. .WHAT ARE THEYALL ABOUT?

Read And Follow These Instructionsand Warnings Before Using This Device

Don't Attempt to Operate WithoutReading and Following Instructions andWarnings . ..

Failure to Obey These SafetyInstructions and Warnings May Result InFire, Explosion or Other Casualty,Causing Serious Personal Harm andProperty Damage to Yourself andOthers ...

For Your Own Safety and That of Others

You might think that this language Istaken from the instruction sheet ormanual for a buzz-saw or perhaps evena radioactive device. In fact these are ailquotations from instruction sheets andmanuais that come with or are attachedto popular radio control devices andcomponents. You might well ask, "But Ithought this was a hobby, a fun thing.Why all these dire warnings andcautions?" The answer is simply,because they are needed.That need can be broken down into

two aspects. The first is the need toproperly instruct and warn the user of theR/C component or device about thesafety hazards that are potentially there;the manufacturer or distributor wants itscustomers to know how to properly usethe component, build the kit or device oroperate the model. After all, it is satisfiedcustomers who build a business andspread the word of something worthowning. The other aspect is thenecessity of warning the modeier that anabuse, a misuse or a failure to follow theinstructions and directions may result inserious personal injury to the modeler, toothers or property damage (includingthe loss of the model). At the same timethey know that if they fail to properlyinstruct, warn and direct with respect to

By Arthur J, SablnProf, of law

the use of their product, there is apotential legal exposure.We all know that there has been a

significant increase in consumer actionsagainst manufacturers for allegeddefects in their products, leading toserious personal injury. Not only is theuser or consumer protected by productliability case law as it has developed inmost states of our nation, but bystandersas well. It is for that reason, for example,that the woman in Pennsylvania whowas struck by an R/C model as she waswatching a swimming meet sued anumber of component makers of the R/Caircraft, and not only the R/C pilot.Therefore, because R/C

manufacturers and distributors wanttheir products to be used safely andproperly, they have given considerableattention to stating proper safetywarnings, instructions and directionsconcerning their products; at the sametime they are telling the modeling publicthat if you fail to abide by reasonableinstructions, warnings and directionsconcerning the use of the product, youcannot hold the manufacturerresponsible for any injury or damagesuffered from such misuse or abuse ofthe probuct. As the law has describedthis situation, such a user or consumerhas assumed the risk of his owninjury or loss. If a bystander, such asdescribed in the Pennsylvania case,sues the manufacturers or distributors ofR/C components along with the R/C pilotand the manufacturers or distributors

prove that the pilot assumed the risk of adefective product (assuming that therewas a defective product and not simplypilot error) then all of the fault and liabilitymay ultimately lie with that R/C pilot.

It is apparent that there is a twofoldburden: the first is on the manufactureror distributor to make certain that thereare adequate warnings, directions andinstructions so that the modeler cansafely use the component. Indeed aproduct may be considered "defective"if there is the failure to reasonably andadequately warn, direct and instruct. Onthe other hand, the R/C modeler has the

obligation of reading and obeyingthose safety instructions and warningsin order to avoid the fault of beingnegligent or having assumed the risk ofany defect or deficiency in the product.

But what about the attitude of theaverage modeler? Has the averagemodeler come to the point where hetakes seriously the warnings, safetyinstructions and directions that arecontained in that kit, with that radio, withthat engine and propeller?

Having viewed the R/C scene for anumber of years, I don't think anyonecould count the number of minor injuriesthat have occurred as a result ofoperating R/C models; for example, cananyone who has operated an R/Cengine for any length of time really saythat they haven't had their fingers"smacked" or much worse, as thenumber of stitches on the hands andother parts of the bodies of R/Cmodelers frequently testify?The manufacturer, as indicated in this

series, has a legal responsibility toproperly warn, instruct and direct as tothe safe use, operation andmaintenance of its product, but does themodeler accept his responsibility? Themodeler's failure to abide by safetyinstructions, warnings and directionsmay result in his assuming the risk ofinjury to himself and liability for injury toothers, where the manufacturer didwarn, instruct and direct and themodeler failed to abide by what hadbeen supplied with the product.

Let's start by taking a look at whattypical manufacturers are saying abouttheir kits in terms of safety instructions,warnings and directions. You willimmediately note that what isrecommended is apropos to the buildingof any R/C model so the words are worthconsidering regardless of what youmight undertake building. Here are a fewsamples drawn from the safetyinstructions and warnings of differentmanufacturers of R/C kits:WARNING

A Radio Controlled Model is not a"toy." Care and caution must be taken in

38

properly building the model as well as inthe Installation and use of the Radio

Control device. It is Important to followall directions as to construction of this kit

as well as installation and use of the

engine and radio gear. The advice andassistance of a well experiencedbuilder and pilot is highlyrecommended. Don't take chances.

Improper building, operation or flying ofthis model could result in serious bodilyinjury to others, yourself, or propertydamage.IMPORTANT NOTE

TO THE BUILDER

Every model built from a kit isdifferent, reflecting the level of skill aswell as the favored building techniquesof the modeler. Ultimately thus, eachmodel is essentially the individualcreation of that builder.

Changes and variations take place inbuilding so that while . . (kitmanufacturer) supplies most essentialbuilding materials, the end product isthe creation of the modeler.

Therefore (kit manufacturer) assumesno responsibility for the performance ofthe model, nor does (kit manufacturer)assume any responsibility of any naturewhatsoever for the loss of, or propertydamage resulting from the operation ofthis model when it is completed.

I think their message isstraightforward and honest: the modeleris the basic creator of the model and

there is no way that the manufacturercan really control what the modeler doeswith that model. Most manufacturers

spend a great deal of time and make anenormous effort to insure that areasonably well built model will performsafely. But ultimately they can't controlthe innumerable variables involved inthe building and so can only delineatesome basic safety factors and remindthe modeler that the building isessentially a matter of the creativity ofthe modeler for which he alone isresponsible.Beyond the building of the model

itself, there are the concerns with thesafety factors Involved in the installationof the radio gear and the testing of thatgear. Most R/C manufacturers anddistributors of radio equipment havenow moved to specific instructions,warnings and directions with respect tothe installation of their radio gear in anR/C model. All carefully instruct ontesting the radio in the model before itsoperation and call upon the modeler toget assistance from a proficient pilotbefore operating that model. The fieldtesting of the radio gear is so importantthat it has moved into the Academy ofModel Aeronautics Safety Code for R/Cmodels: it is incumbent upon all of us tomake certain that the radio is rangechecked and operating properly beforewe use the model on every occasion.

At first glance or thought it seemsabsurd: of course everyone knows how

to mount a propeller and to be carefulwith the use of props on models. But therecord speaks differently. Using thewrong size prop: mounting the propbackward; failure to properly tighten theprop to the engine: using props that havebeen dented, nicked or even split ("I'msure I can get another flight out of it") arejust some of the problems that haveplagued the use of propellers bymodelers, resulting in injuries, most ofwhich, happily, are of minor dimension,but unfortunately a few have resulted Inserious consequences that maim andinjure in a way that time alone does notheal.

A few years ago, recognizing the needto act, a number of manufacturers anddistributors of propellers attended ameeting at the same time they wereinvolved with the Toledo show. As a

result of that meeting, proposals forsafety instructions and warnings to beplaced on a sheet of paper going witheach propeller or box of propellers wascirculated. Ultimately there was generalagreement as to the contents of what theInstruction and warning sheet shouldcontain and it was adopted first by TopFlite Models, Inc., for their propeller line:they specifically did not copyright thematerial so that other propellermanufacturers and distributors couldadopt any or all the language involved.Because this area is of significance to

most R/C modelers, the instruction andwarning sheet is reproduced here withthe hope that every reader will take thetime to examine what is said and think

about their own method of handlingpropellers.

ADDITIONAL PRECAUTIONS

(A) Use safety glasses when startingor running engine.(B) Don't run engine in area of loose

gravel or sand; prop may throw suchmaterial in face or eyes.(C) Keep away from prop: Loose

clothing, shirt sleeves, ties, scarfs orloose objects (pencils, screwdrivers)that may fall out of shirt or jacket pocketsinto prop.(D) Make certain glow plug clip or

connector is secure so that it will not popoff or otherwise get into running prop.(E) If a spinner is used be certain its

edges do not touch the prop blades.ADDITIONAL SPECIAL WARNINGS

AND INSTRUCTIONS FOR

NYLON PROPELLERSNylon props are affected by amount of

moisture in the air and will become brittleand break if too dry. Since amount ofmoisture may vary greatly from time ofmanufacture, do as follows:(1) Boil each propeller in water for 30

minutes before first use. Water should

cover the entire prop. Do not cover pot.Let prop stay in water until cool.(2) You can add dye (Rit, etc.,) in the

water to identify boiled props as againstunboiled.

(3) After use of prop, remove fromengine, wrap In moist cloth, paper towelor rag and store in water tight plasticbag.INSTRUCTION AND WARNING

SHEET—HOW TO USE

PROPELLERS SAFELY

& PROPERLY

The failure to read and follow

instructions, abuse or misuse, mayresult In serious personal injury!(1)For correct propeller size and

pitch, follow advice of enginemanufacturer or prop chart availablefree from dealer or Top Flite.(2) Install prop with Curved side

facing you. Securely tighten propellernut; use correct wrench for this purpose.(3) When starting engine, keep

spectators away (20 feet or more) andout of path of rotating prop.(4) Keep hands away from prop ,as

much as possible; use "chicken stick"device or electric starter; followinstructions supplied with device.(5) Keep face and body away from

path of prop as you start and run engine.(6) Make all engine adjustments from

behind rotating prop.(7) To stop engine, cut off fuel supply

or follow engine manufacturer'sdirections. Don't use hands, fingers orany part of body. Don't throw anythinginto a running engine.(8) Discard any props with nicks,

scratches, splits or cracks or any sign ofwear or damage. Never repair, alter,shave or bend a prop! Normal enginevibration can loosen a prop: inspect andretighten if necessaryl

The message is loud and clear; fromthe warnings contained with the kit, thesafety instructions that go along with theengine to the requirements with respectto radio installation, operation andtesting, the aim is consistent; Make allinvolvement with every aspect of radiocontrolled modeling safe; avoid turningthe fun and excitement of R/C modelingInto injury, tragedy and loss for yourselfand others.

I close with that which must be labeledas pretty obvious — but then a lot oftruths are pretty obvious. Those safetyinstructions and warnings are there forthe modeler's protection, for the safeand proper use of the componentinvolved in the functioning model. To,ignore, avoid or disregard a warning,instruction or direction opens themodeler up to the potential of injury withor to his model or others or theirproperty, potentially turning the mostchallenging and exciting avocation intogrief and heartache.Now will you please read and follow

those safety instructions, warnings anddirections!

Your comments and suggestions arealways welcome: write to me at 315South Plymouth Court, Chicago, Illinois60604. □

39

Anew name to the R/C boating activity is PratherProducts, 1660 Ravenna Ave., Wilmington,California 90744. Terry Prather has unmatched

credentials in Formula I R/C aircraft racing and is now devotinghis efforts to R/C boats. His first offering is the Prather DeepVee Sport or Racing Boat for .40 to .65 cu. in. engines. Prathercommissioned George Campbell, a prominent West Coastboat designer to design the boat that could be highlycompetitive in racing and would be stable and easy to handlefor the sport boat enthusiast.

After watching the Prather boat perform in several races andpractice sessions, we were so favorably impressed that wedecided to build up a matched pair to race in the NAMBAEnduro Event (100 lap team relay race).When you open the box, you really don't find a whole lot of

stuff in it. You get your first warm feeling when you examine theepoxy fiberglass hull that has the deck installed at the factory.We have seen many fiberglass products and Prather's work issecond to none. After considerable time was spent in fondlingthe sleek hull, the engine mount rails were examined. Theabsolutely clear 3/8" thick hard maple mounts has a bevelpre-cut to match the hull bottom. All of the goodies are strictlyfirst cabin. Incidentally, the box size is 10" x 16" x 20".Construction:

Probably the most valuable item in the box, particularly forwe neophytes, is the instruction book. Since Terry and AlPrather are new to the R/C boat scene and had to learn anawful lot the hard way, they have documented everything thata newcomer needs to build and operate their boat. Explicitstep-by-step instructions are iliustrated with 46 photographsand 2 drawings. Also included are running and maintenanceinstructions.

SPECIFICATIONS

Name PRATHER 40 DEEP VEEBoat Type Sport or CompetitionManufactured By Prattler Products

1660 Ravenna Ave.

Wilmington, Calif. 90744Mfg. Suggested Retail Price S99.95Available From Both Mfg. & Retail OutletsHull Length 40 InchesBeam 12 InchesMIg. Rec. Engine Range 40-.65Rec. Fuel Tank Size (2) 16 oz., (1) 6 oz.Recommended No. of Channels 2Recommended Control Functions Rudder & ThrottleBasic Materials Used In Construction:

Hull Fiberglass & MapleBuilding Instructions on Plan Sheets Yes

Instruction Manual Yes (28 Pages)Construction Photos Yes

RCM PROTOTYPE

Radio Used Putaba & KraftEngine Make & Disp K&B 7.5cc MarineTank Size Used 3 Tanks (38 Oz.)

SUMMARY

WE LIKED THE:

Superb fiberglass components. Completely detailed Instructionbook. Stability and ease of handling. Competitive performance.

WE DIDN'T LIKE THE:Slightly flimsy joint between hull and deck In engine compartmentarea. (Manufacturer has corrected this on current production.)

Our first step was to obtain all the items required for theproject. From Prather we picked up the optional hatch coverset, running hardware kit, and several accessory items, alllisted in the instruction book.

While handling the hull we felt that the deck around theengine compartment was not sturdy enough for roughtreatment and we epoxied a strip of glass cloth tape along theinside overlapping the deck to hull seam. This stiffened thedeck considerably. Prather was notified of this modification,and the reinforcement is now installed during themanufacturing process at the factory.

to page 151

40

MLm'

lbCrafft-Air Inc*

DRIFTER 11

The Drifter II kit immediately attracts your attentionbecause of the two choices you are given uponreading the label on top of the attractive box. You

have the option of building your next sailplane with a 6' wing orwith the optional two meter wing. As you open the box you areintroduced to a set of surprises, the first of which is the sheet ofrolled plans. Not only are they rolled but they are rolled with theprinting out. Unroll them on your building board and they staythere smooth and flat, no need looking for a set of lead weightsto keep the four corners from exploding back into the originalroll. Second, the quality of the wood was excellent and, as thefront of the box indicated, "absolutely nothing needed exceptglue, covering, and radio."The kit is set up for the 72" wing: the two meter wing may be

attained by expanding each center section S^/s". The materialsfor the two meter wing must be purchased additionally, theyare not included in the kit. Sizes and dimensions of the extra

wood are given on the plans.Construction;

All of the instructions are written across the top of the planswhich are 45" long by 35" wide. As you build the wing sections,just elevate your eyes slightly and there it is, the easilyfollowed step-by-step details. When the wings were finishedand the plans pushed up on the workbench to start thefuselage and empennage, it was disconcerting to see theinstructions disappear over the top edge of the workbench. Atthis point, the instructions were neatly removed from the top ofthe plans, folded in half and construction with completedirections was continued.

The next surprise came when we discovered themanufacturer really meant it when they said nothing else wasneeded. In addition to the standard sheets of balsa wood,

sticks of spruce and balsa and pieces of plywood, the everpresent little plastic bags of goodies which contained pushrodwires, clevises, hinges, horns, towhook, and servo mountingmaterials were also included. It is really a complete kit. Notonly is the kit easy to build, they did not sacrifice goodtechnique for ease of building.We are prejudiced by building old timers and really do

SPECIFICATIONS

Name DRIFTER IIAircraft Type Competition SailplaneManufactured By Craft-Air Inc.

20115 Nordtioff St.,Ctiatsworlti, CA 91311

Mfg. Suggested Retail Price $19.95Availabie From Bott) Mfg. & Retail OutletsWing Span 2M/72 IndiesWing Ctiord IBVz indiesTotal Wing Area 573/635 Square IndiesFuselage Length 38 inchesStabilizer Span 20 InchesTotal Stab Area 80 Square InchesMfg. Rec. Engine Range 049Recommended Fuel Tank Size w/englneRecommended No. of Channels 2Recommended Control Functions Rudder & ElevatorBasic Materials Used In Construction;

Fuselage Balsa & PlyWing Balsa, Spruce & PlyTail Surfaces Balsa

Building Instructions on Plan Sheets YesInstruction Manual NoConstruction Photos Yes

RCM PROTOTYPE

Radio Used Kraft 3 ch. KPS 12 servosEngine Make & Disp CoxTank Size Used N/AWeight, Ready To Fly 18.5 OuncesWing Loading 4.26 Oz./Sq. Ft.

SUMMARY

WE LIKED THE:

Two kits In one—72" wing & 2 meter wing. Excellent plans with fullinstructions. Quality of wood very good.

WE DIDN'T LIKE THE:

Die-cutting was not so good.

appreciate the turbulator spars forward of the main spar. Atsiow speeds It is necessary to use either turbulators orincrease the angie of attack to keep the piane in the air. Birdswith their movable wings can increase the angle of attack but itis rather difficult to do that with a model in flight. This turbulatedair over the top of the wing seems to give more lift to the wing atslow speeds and has relatively little effect at high speeds.Covering:The covering applied was transparent and opaque

MonoKote.

Engine:The Drifter II may be flown with a power pod which is well

detailed on the plans. It uses a Cox tank mount engine such asthe Baby Bee or Golden Bee .049.Radio:

The radio used was a Kraft 3 channel with KPS 12 servos.For this particular radio no difficulty was encounteredspace-wise. The battery and receiver were located in theforward compartment and the servos were located at theCenter of Gravity under the wing.Flying:

Drifter II is advertised as being easy to fly and we concur. Onthe second flight from a high start, we were snared by a granddaddy type thermal and finally chickened out before it became

to page 151

41

TAKE

A

SAILPLANE

OUT

TO

LAUNCH

TODAY By Al Do

In every sailplane club there areflyers who consistently gethigher launch altitudes than

the rest. It is no coincidence that thesesame flyers are the contest winners inthe club. The ability to get consistentlyhigh releases certainly does notguarantee wins, but consistently poorlaunches will guarantee poor averageperformance.

This article explores the dynamics ofthe sailplane launch and tries to identifyproblems in technique or adjustmentthat prevent adequate performance.Most remarks are directed toward theuse of an electric winch as the motivepower.

There are five symptoms that point tofaults in techniqu^or adjustment: (1) Aviolent yaw which may occur anytimebut is more often seen during the steepclimbing segment of the trajectory:(2) Yaw oscillation or weaving back andforth; (3) Inability to achieve a steepclimb and hence a low release altitude;(4) An immediate sag in flight path thattakes several seconds to recover normalclimb, and (5) The glider pops off the towline during the steep part of the ascent.

In a free-glide mode, the forces actingon a sailplane are due to lift, drag andgravity (Figure 1).

In a launching mode, one more force,towing force (Ft of Figure 2) is present,but the sailplane is gliding in the sameway as it was in the free-glide mode ofFigure 1 with two exceptions. Theconstant force of gravity has beenreplaced by the controlled towing forceFt, and the force of gravity Fg is now a

variable vector acting like drag duringinitial ascent. The ship goes up on towbecause the forward component of Fiisgreater than Fg + Fd.The glide angle of the ship in Figure 1

is represented by the ratio of lift to drag,or the LVD we have heard about before.As the angle of attack is Increased, theglide angle, UD improves until it reaches

•Fd

FIGURE 1

ig

a maximum. Further increase in angle ofattack results in a worsening glide angleuntil the stall angle is reached and liftdeteriorates rapidly. Increases Insailplane weight raise the wing loadingwhich increases the forward speed but,within bounds, does not affect the glideangle. The glide angle or glide ratio isrepresented by the distance traveleddivided by the distance descended.The sailplane shown in Figure 2 also

has a glide ratio which is represented bythe distance traveled divided by thedistance descended. In this case, thedistance of the trajectory traveled isroughly on a circular involute or distortedellipse. The distance descended is theamount of the line on the reel. To get themost height from a launch, we want theleast line on the reel. Therefore, weconclude that to get the best height, weshould fly a maximum L/D trajectory forthe particular sailplane. One thing to be

FIGURE 2

42

realized is that during launch themaximum L/D varies.

We previously noted that'duringascent the force of gravity, Fg, was avariable vector which acted like drag,increasing D, thereby worsening the L/Dratio. We also noted that as the angle ofattack Is Increased, L/D increases until amaximum Is reached. This peak In L/D iscaused by the induced drag increasingfaster than lift. Further Increases in

attack angle have the effect ofdecreasing both the rate at which thesailplane Is descending, as well asforward speed and glide angle. Finally,the wing reaches the stall angle. Thebest L/D on tow probably occurs at anangle of attack just before stall. This isbecause the best L/D occurs when

Induced drag equals the remainder ofthe drag and on tow there Is anadditional drag due to the tow line, amajor effect, and "drag" due to gravity.Consequently, the best L/D on towoccurs at a higher induced drag (higherangle of attack) than the best L/D In freeflight. Since the best free flight L/Doccurs not too far from stall anyhow, asailplane on tow should be flown asclose to stall as controlablllty andstability permit.

Minimum sink rate does not have

much meaning on tow. The sink rate inthis case is the speed that the line istaken onto the winch reel. The point toconsider is that at an angle of attackgreater than that which producesmaximum L/D, induced drag and theresultant lower L/D not only results Inless launch altitude but the ship is veryclose to stalling. We are really treading avery narrow line. A stall on tow results inthe undesirable yawing which variesfrom violent to gentle depending on thestall characteristics and stall mode.

A most common potential disaster onlow Is tip stall. Most gliders will not tipstall unless considerably yawed — oftenbeyond the maximum yaw that can becommanded by the rudder. Initial yaw,which many times will start a tip stall, cancome from launching with one wing low.It pays to check for level wings at eachlaunch. Once a tip stall starts, It IsImportant to quickly get the nose downand the glider back on heading.A further complication to the launch

glide angle is the effect of gravity. InFigure 2 we noted that during a launch,the force of gravity opposes the forwardcomponent of the lifting force. Thisappears as drag in the force diagram.The magnitude of this gravity drag whichacts in opposition to the forward liftingforce is proportional to the cosine of theangle of ascent. A 90° or vertical launch,If this were possible, would have the fullforce of gravity acting like drag. To apoint, the higher the angle of attack, thegreater the lift and the steeper the climb.However, in addition to the rise Ininduced drag with greater attack angles,another non-linear drag function.

gravity, comes into play. All this tells usthat the steepest Initial climb does notnecessarily result in the highest launch.Also, since the drag-like force of gravityIs directly proportional to weight, thebetter launch can be achieved with a

lighter sailplane — all other things beingequal — which comes as no surprise.Even though the steepest climb may

not be optimum, the best climb is prettysteep. Assuming the glide angle of asailplane is degraded during a steeplaunch to 5:1 to 8:1, the optimum initialclimb is still from 79 to 83 degrees. Theflyer should apply sufficient up-trim toachieve a steep, fast climb that Is farenough from stall that pitch transients,such as winch pulsing do not drive theangle of attack into a stalled condition.

Let's now consider launching speedand technique. It is very possible tolaunch a sailplane In a fully-stalledcondition. Two good ways to do this areto. point the ship up and then throw itstraight out or, second, let the line jerkthe ship out of your hand. In the firstinstance, the ship may have goodairspeed, but the angle of attack isabove the stall angle. At this point theflying field tips up and the ship runs rightInto the side of it. The results of thesecond case are the same, but thereason is different. The towing force isgenerally applied to the glider through ahook on the bottom of the fuselage. Thisforce may act on the center of inertia ofthe ship through a "couple" (Figure 3)

The Inertia of the ship opposes thetowing force. The forces are, however,applied at points displaced by adistance, M. This causes upwardrotation. As there Is initially little fonwardspeed, the stabilizer Is not effective andthe wing is rotated into a stalled angle ofattack. This condition Is evident in the

ship that almost does a tall slide onlaunch which Is finally recovered whenthe stab gets the angle of attack sortedout. This can be avoided by:(1) Launching with sufficient airspeed sothe stab is effective; (2) Launching at anangle high enough that the towing forcevector passes through the Center ofGravity: therefore, M = O (Figure 3); or(3) On heavy sailplanes, or ones withinsufficient elevator authority, theproblem is sometimes solved by towingwith a yoke attached at the G.G. pointInstead of the bottom of the fuselage. Itmust also be stated that solution #2

must be accompanied by a heave toestablish a viable angle of attack,otherwise the tow line will pull the shipforward at an angle of attack which maybe above stall.

All this discussion concludes that a

sailplane should be given sufficientInitial airspeed to generate enough lift tosupport Itself. In his "Challenger" article.Otto Heithecker gives us somelaunching guidance: "Hold onto thegilder until the winch builds up plenty ofpull then heave. That's right, heave,don't just let go." It's difficult to launchtoo hard if done smoothly.

Next we come to launch angle. Ideallythe ship should be launched at 80° and20 mph. There are a couple of thingswrong with this. First, there is no way Ican heave my SVa pound Challengerstraight up. Even my 47 ounce Aquliapresents a challenge in this department.Second, I have shortened the nosemoment on two sailplanes when the tow

to page 142

FIGURE 3

43

LOU PROCTOR

MAGNIFICENT

A young Lou Proctor, far left, with a very young Charles LIndbergand some other model contest winners; about 1929.

I have been opening kits for more years than I care toadmit, some have impressed me greatly, some havejust impressed me and then there have been

others .. .

It comes right down to, "Whatyoubuyis whatyouget,"—quality and price usually go hand in hand. Don't expectmatched sheet balsa, balanced wing spars, full hardware,hand picked sawn and sanded wing ribs, for bargainbasement prices.Some of the kit manufacturers have had to make the

decision that if they want to meet or beat the market,shortcuts have to be taken and you, the modeler are expectedto do a bit of trimming and sanding.Then there are a few who, no matter what, will not allow

their quality to deteriorate. One of these is known topractically everyone who has been building models for anylength of time. He answers to the name of Lou Proctor. Lou isa person who really does give a darn how the buyer of the kitis impressed and someone like that should have his kitspraised to the sky. I have built three kits that, to my way ofthinking, are the epitome of model aviation; they are theProctor Antic, the Proctor Bipe and the Mini Antic. These kitshave one thing .. . QUALITY . . . you just can't emphasizethat word enough when it comes to products that bear LouProctor's name.

i have had the pleasure of spending many hours in Lou'splant over the past 5 or 6 years. It is clean, there isn't a speckof dust anywhere, the tools and machines in his machineshop are immaculate. Everything has its place and is there; I

A It. Ferguson, USN, Lou'sfather In the center, and Lou in the latestspace garb. Photo taken in Butle, Montana, 1930's.

am not sure whether it is Lou or his lovely wife who insiststhat it be that way, but I wouldn't be far wrong if I bet it wasboth of them. They work side by side in the plant with one ortwo employees who make up the whole work force ofProctor Enterprises. Lou runs the production line making surethe inventory of every kit part is up to date, Elsa packs theboxes and, with Lou's help, gets them ready for delivery.

Every part of the kit fits and fits exactly when the timecomes to install it in the plane. Sanding a little bit off orhaving to make a new piece because it was too small just isn'ta part of Lou's quality control. Recently, I had to rebuild thefuselage of my Antic. Due to pilot error, it had a hard landingwhich others might be tempted to insist was a crash. All I hadleft was the engine mount and the empennage, everythingin-between was totally destroyed. Knowing that Lou keeps afull stock of fuselage parts on hand at all times, I paid him avisit to collect the parts I needed. Remarkably, they lookedexactly like the same parts that were in the kit when Ipurchased it six years ago. When the rebuilding was altfinished I proceeded to the next step, attaching the enginemount to the firewall. The firewall has four little indentationsin it where the holes should be drilled for blind mountingnuts. Without first thinking of matching them up with theengine mount, I drilled the holes, inserted the blindmounting nuts and then it dawned upon me — will theymatch? After all it had been a long time since I built theengine mount. With great trepidation, i put the engine mountup against the firewall and inserted the Tirst machine screw. Itfit! Well of course it fit, idiot, that was only the first one. Then

lust like 1911 on an early morning in France, on the way out to meetthe hun. Jack Paul's Proctor bipe on a take-off.

Prototype Parasol Antic, with upright engine and Williams Brotherswheels. Wide well placed gear makes ground handling easy.

AND HIS By Paul Denson

FLYING MACHINE

Paul Denson's first Antic. Clear transparent MonoKote is used onthe open framework to keep out dirt and grease.

The man today — Lou Proctor In front of his San Diego, Californiashop, with a Proctor Parasol prototype model.

I inserted the second, the third and the fourth. Miracle ofmiracles they all fit with absolutely no binding. With thatfantastic bit of information I approached Lou the next dayexpecting to inflate his ego to the rafters and what did I get,"Of course it fit, how could you expect it to be otherwise?"Then I remembered that it was Lou Proctor I was talking to.He tools his jigs and templates so that every part that goesinto one of his kits is identical to the same part that has beengoing into every one of his kits for years.

If you have looked at some of the kits now available youkinda wonder how you can build a plane with so few parts.Take a look at one of Lou's kits; there are so many parts therethat it looks like one of those jigsaw puzzles that used tocover the whole card table. And every one of those parts isjust as precisely made as was my firewall. Every part is legiblynumbered to simplify construction and not only that, but youwill find it identically marked on the plans.

Another friend who makes kits among other things, oncehelped me to get my head on straight regarding the hobbywhen I complained about how hard it was to build a certainsection of his plane. He asked me why I was in the hobby, ifnot for the challenge? If you really want a cha//enge and wantto build a plane you will be proud to own, then accept thechallenge of one of Lou's kits. I have yet to talk to anyonewho didn't finish one of the kits once started, nor who didn'tenjoy it from the first glue joint to flying.

According to pictorial evidence, Lou first showed his skillat model airplane building at age twelve. We are sure itwasn't glow engines, radio control or MonoKote that

attracted his attention, they hadn't been invented yet. It wasstrictly the product of rubber power, tissue, bamboo, balsawood and chew it off your fingers type of glue that appealedto the crea(»V/fy in Lou.

During the next five years, at the urging of his very goodfriend )im Walker, he was he was actively engaged in modelbuilding and also worked part time at Bacon Aircraft inVancouver, Washington, making drawings for, and helpingrepair, airplanes. In 1927, while working at Bacon, Louearned his pilot's license.

Barely two years after Lindberg made his historic flight,Lou had his firstcontactwith fame. In 1929 he entered a local"Lindy" model plane contest and placed Second. He wasawarded his prize by the Lone Eagle, Charles A. Lindberghimself. Within weeks following this contest, working 16-18hours a day 6 days a week, Lou built a scale model of aVought-Corsair biplane destined for entry in the forthcomingNATS. The plane was very well detailed with individuallycast cylinders, pushrods, and connectors, with controls thatworked flying surfaces from both cockpits. This planequalified for entry by winning the local contests then went onto win the scale competition at the NATS. First prize was anall expense paid six weeks tour of Europe.

fnroute overseas on the passenger ship "Dutchess ofAthol," he was accompanied by the indoor rubber champJoseph Culver of Oakland, California, and Donald Burnham,the outdoor rubber champ, from West Lafayette, Indiana.During their spare time aboard ship, the boys built airplanes.

to page 139

The Antic on floats — also available as a Proctor kit. This one hasoak stained fuselage front end and floats.

Another view of the Mini-Antic, with a C.I. |oe pilot giving you a"Clear" just before engine start. .19 engine required.

Since 'the beginning of time,''There have been those men '

Who looked to the sky, who envied birdsTheir graceful soaring flight,Who said to themselves."If I could but fly... " .This is the.story of those mdn,''And how they learned to fiyi \And the remarkable things ; iThat have happened since, i!

With this greeting, ybu are welcomed to the display area ofthe United States Air Force

Museum, the world's oldest and largestmilitary aviation museum. First openedin 1923, it is appropriately located on theoutskirts of Wright Patterson Air ForceBase, near where the Wright Brothersdeveloped the first airplane and learnedto fly It."This is the story of those men"; from

the beginning of recorded history, as farback as Kenshu.the Egyptian Navigatorof the skies of about 1000 B.C. and

Ashur, the mythical Assyrian WingedDiety, up to and including some of ourrecent space achievements, men andhardware.

The Air Force Museum is part of ourUSAF, but is neither the story nor a tribute to man's efforts to discover moreefficient ways in which to destroy hisbrothers. It does, however, depict faithfully and without prejudice the variouswars in which the flying machines playedan ever increasing role. The Museum ismore a moving story and a tribute toman's efforts first to challenge an environment for which he was not designedand is ill suited, and later to improve hisknowledge and machines to the pointwhich we now know, and so often takefor granted. On Our visit to the Museum,we learn, or are. remirided of all thepioneers, from the early Montgolfier balloon, and DaVincI man powered helicopter which didn't work, to the Wright'sairplane which did, and which is generally accepted as the beginning of man'strue flight. There are no names skipped;there is Lilienthal and Chanute, there isLindberg and Rickenbacker, there isBilly Mitchell and Colin Kelly. There arerelative newcomers, like Chuck Yeager,

By Eloy Marez

and Gordon Cooper. And there are rela-tlve unknowns, such as some WorldWar II Prisoners of War, and Rosie TheRiveter, of fame during the same era.There is simply not enough room here

to tell you all that there Is. It took "theMuseum staff a 216 page book to do so,and.we will tell you about that later. I wiijstress one thing: if there is one ounce of.patriotism or pride for our country and itsachievements in you, if you "are deeplyinterested in aviation and airplanes, ifyou were ever a crew member in any AirForce airplane, or if you have ever flownsimply for the love of flying, don't go tothe Air Force Museum. It is guaranteedto cause you more than one case ofblurred eyesight or runny nose.

It may be when you once again seethat old fabric covered trainer in which

you first soloed, or maybe that bomberor fighter in which you flew all those missions. Or it may even be an airplanewhich you yourself never flew, such asthe P-38 Lightning so beloved by thelong range bomber crews that theypraised it in song and poem. Or yourattack of emotion might come at a completely different and unexpected time.Remember Saturday morning parade inSan Antonio during Army Air Corpsbasic training, when it was 110° in theshade, and no shade. The "Off we go" Ofwhat.vyas then the Army Air Corpssongdid noLdo much for most of us then, but Ican guarantee a completely differentfeeling at this point in life, upon hearing itsung by Robert McArthur Crawford, justas he wrote It back in 1939.

Yes, I will admit to having to fumble fora handkerchief on more than one occa

sion, but then after 24 years of flying withthe USAF, I feel I own stock in that particular company. And once again, sittingin the radio operator's position in a B-17after some 30 years have elapsed doestend to bring back memories. In-theyears after. I logged a lot of hours ahdialot of miles in Uncle's transportairplanes, and what brought back thestrongest memories was the Douglas0-124 Globemaster ih which I flew morehoure and to more places than In anyother bird. "Ole Shaky" as she was cal

led, flrat produced in 1950, is not yourmodem airplane, though it was the firstof the biggies, and I'm sure providedmuch data for the ones that came later.

The C-14 spanned 174 feet, 130 feetlong, with a maximum operaGng gross of180,000 pounds. It was powered byPratt and Whitney R-4360 engines of2800 horsepower each, the largest andmost advanced piston engine ever"made. The 4360 is the displacement, in28 cylinders, in four banks of seveneach. The C-124 wasn't fast, cruising atonly 180 knots, but it was steady. Wewent to such exotic places as Rio,Range Pango, Hong Kong, Moscow,and the South Pole together. We hauledrelief supplies to the Brazilian floods,and to Chilean and Worrocan earthquakes, and broughi;Out refugeesfrom Hungary and Lebanon. We hauledBelgian troops into the Congo, andfamilies out. We carried Ambassadors

complete with household furniture andautomobiles to their new stations, andonce a badly burned little girl to the AFburn clinic in Texas. We parachuted adrug needed to cure a rare disease intoSt. Helena, down in the South and laterhauled penguins from the Antarctic tothe Portland Oregon Zoo. And she always brought us home! Now, I ask you,how can you see a friend with whom youshared such adventures and not getsentimental?

Because as we all know, airplaneshave a character and personality of theirown. Some come from the designersand builders, some is inherited from thepeople who maintain and fly them. In thisrespect, the airplanes at the Air ForceMuseum must consider-themsSlves

lucky. They must know that they havehad their part in aviation history, and thatthey will never fly again. They are old,yes, but as in the case of people, old ageis better than the other alternate. These

airplanes have escaped the junk pileand the cutting torch, and are at rest witha new family that loves and respectsthem, and cares for them.

A museum cannot, and is not, only acollection of inanimate objects. It, in turn,is enriched by the personalities of those

RCM VISITS Phot:os By Dick Tichenor

THE AIR FORCE MUSEUM

Aerial view of the museum and grounds. The main buildingopened in 1971, contains over 230,000 feet of space.

Dick Tichenor's favorite, the B-70, one of the many projects hewas involved with during his years in the aerospace industry.

46

Kathy Arnold, one of the museum'svolunteer guide ladies. Spec/a/ tours forschool classes and other groups areavailable.

The Wrights did not only make bicyclesand invent airplanes, they also designed awind tunnel, which worked up to 160 mph.

F-80C now under restoration, beingworked on by John Lyons in the nose, andCharlie Smith in cockpit. Walter^ Olsensupervises.

Tom Campbell (L) and Gerald Rittingerworking on a Boeing P12 restoration.Approximate completion date is in abouttwo years.

Eloy fi/larez browsing in the aviation bookbuyers paradise, the AF Museum'sbookstore. Catalog is now available, theyaccept mail orders.

...Z -'IrJIDick Tichenor, minus his Instamatic, andMuseum Director Co/. Richard Uppstromdiscuss the F-107 undergoing restoration.

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The famous Curtiss P-40 Warhawk, in thecolors of China's Flying Tigers. Manyfamous aircraft, often one of a kind, are ondisplay.

whose duty it is to establish and operateit. And if ever the military placed a man inthe best possible position for both himand for the job, they did so with the assignment of Col. Richard L. Uppstrom asMuseum Director back in November1977. To start with. Col. Uppstrom is anRC'er, a scale builder as you might expect. He has some 5100 hours of flyingtime, including about 1200 combathours, and 396 combat missions. Hehas flown the old Martin Marauder,some of the jet fighters, and flew C-47'sin night illumination and psychological

And there we were... Eloy Marez and Col.Uppstrom swap flying stories while sittingin the B-17. Some were even true!!!

47

warfare roles in Vietnam. To this job ofMuseum Director, Col. Uppstrom iscompletely dedicated and, very frankly,admits to loving the job. We commentedupon the fact that he gave the impression of a "kid in a candy store" to whichhe answered by showing us a caricaturesome friend had done, depicting him asa exactly that, a kid in a candy store.

Col. Uppstrom is surrounded by a staffof experts, all of whom share his love forairplanes and dedication to their particular jobs. And it takes all kinds, fromtypists and telephone operators down tothe guys in the back room, the craftsmenwho maintain and restore, and in somecases build, the display airplanes. Nowthese are guys that we modelers canrelate to, the type that spends hours overone rather insignificant looking piece,but which has to be just right before theyare satisfied. In one case, we saw theremains of four different attempts to duplicate the fuselage side panels for anaircraft undergoing restoration. The results of their efforts and appreciation forwhat they are doing is evident in thefinished products throughout themuseum. Even though the general public doesn't get to see these fine gentlemen, we all know that you exist someplace, and we thank you for your effortson our behalf and on behalf of our mutual

friends, the planes that we all love.Also important to the operation of the

USAF Museum is another dedicatedgroup, all ladies, in this case. The Officer's Wives Club of Wright-PattersonAFB gives tours for school classes ofGrades 4-9, on advance reservations.We followed a couple of groups ofyoungsters through part of their tour,and were impressed. First, with the factthat these lady guides enjoy what theyare doing, and are dead serious about it.Secondly, they displayed a greatamount of knowledge about the individual subjects, and about aviation ingeneral and enjoyed sharing it with theiraudience. We are sure that because oftheir efforts, the kids come away with agreater understanding of what they saw,and a better appreciation of aviation'sefforts before we arrived at cannedstereo music and in-flight movies. Recently, this tour service has been extended to adult groups, on a space available basis.

There is another group of ladies whowe modelers will be happy to learn about, the ones who operate the Museum'sResearch Division. They maintain adocument collection of an estimated

200,000 photos, tech manuals, test reports, books, magazine articles, andother materials on USAF aircraft and

other aspects of USAF history. Anyoneis welcome to visit the Research Centerin the main building, weekdays between9 and 4. Though they don't have facilitiesto reproduce photos, you can use anavailable Zerox machine to copy anything there that is of interest to you. Mail

requests are honored, however, the staffand time is limited and research projectsthat require an extremely long time cannot be undertaken.

They do recommend another sourceof information for USAF aircraft, anotherWright-Patterson office which maintainsa micro-film file of information and draw

ings. You may query them reference toavailability and cost of film duplicatesabout any obsolete or non-classified AirForce Aircraft, by writing to ASD/DAD,Wright Patterson AFB. OH 45433.The museum occupies a 400 acre

site; the main building is 800 feet long,240 feet wide, with a ceiling that soars to80 feet. In addition, there is an annex,and shop and storage areas. The aircraftdisplay starts with a reproduction of theWrights 1909 military flyer and ends withthe X-24B, one of the lifting body NASAresearch aircraft. In-between you'll seeScouts and Camels, Texans andMarauders. Liberators and Flying Fortresses, and on the jet age with the P-59,and the Century Series, the F-100 andabove numbered fighters. You'll enterthe space age, with satellites, Mercuryand Apollo capsules. Outside, on theMuseum grounds, you'll see a number offamous missiles, the Titans and theMinutemen. The list is too long, but thechances are that the one you are lookingfor is there someplace.

At the AF Museum, you'll see famousaircraft. There is a C-118, but not just aC-118, rather President Truman's "Independence." In fact, there are threepresidential aircraft on display, and thepresent "Air Force One" is already promised when it is retired. Amongst the famous, there is our modeling friend BobThacker's F-82 Betty Jo, in which he seta Hawaii to New "York distant record

back in 1947. There is the B-29 that

dropped the A-bomb at Nagasaki, and aC-54 of the type that dropped candy tothe children of Berlin during the airlift thatkept that city alive for so many monthsback in 1948. Along with the individuallyfamous, equal space is granted themore humble but certainly reknownedC-47 Gooney Bird.The Museum also plans and operates

a number of special events throughoutthe year. Some may be in commemoration of some historical aviation event, orpossibly the opening of a new display.Aviation movies are shown on previously announced schedules, and a giftshop and book store are also operatedon the premises both chock full of itemsof interest to aviation buffs.

As stated in the beginning, the Story ofthe Air Force Museum has already beendone, in much more detail. The book soentitled is 8V'2 x 11, has over 200 pages,and 450 illustrations. Also available is an

aircraft photo book of over 100 pages,which includes data of all the aircraft on

display except for late additions. Wherecan you get them? From the bookstore,of course. But there is a better way. In

early 1978, a program called Friends ofthe Air Force Museum was initiated bythe Air Force Museum Foundation. This

philanthropic, non-profit nationally recognized organization lists amongst itsaccomplishments the raising of theseven million dollars for the new buildingwhich now houses the museum, all at noexpense to the taxpayer.

Basic membership in this group bringsto you the pleasure of knowing that youare helping to preserve some of ourheritage, both that of aviation and of theUnited States. In addition, you get suchmaterial things the aircraft photo bookmentioned, a Museum aircraft calendar,discounts at the gift and book store, anda newsletter. This membership fee is$10.00. There are progressively highercategory memberships, such as a$25.00 Sustaining Membership, whichbrings you the basic benefits, plus theAir Force Museum book described

above. There are also ContributingMemberships at $100.00 per year, andSupporting Memberships, at $500.00,both with increasing benefits. All memberships will soon receive a gift shopcatalog now being prepared. For yourconvenience, we have reproduced thebasic membership application, or writedirectly to the museum for membershipinformation.

The Museum is always looking for additional aviation artifacts, and includes ashopping list in its "Friends" newsletter.They would like such things as any WWIaircraft or some of those that came a bit

later, such as the P-1, 0-1, A-12, etc.Later than that even, they'd appreciate aP-66 or an A-17A. But they don't needonly complete aircraft, they are alsolooking for F-80C ammo cans, and200-300 square yards of unused astro-turf or similar material. In fact, any articleof equipment or wear that came out ofdad's old overseas footlocker could easily be the only one left in existence andmuch sought after by the Museum. Youare invited to write and tell them about

any such items in your possession andthey will arrange for a possible inspection and eventual donation or loan for

display.The actual location of the Museum is

six miles east of Dayton, on SpringfieldStreet, with easy access from all majorfreeways. Though located on the base. Ithas an easy, no guard, no controlentrance of its own. Admission is free,and it is open 9 to 5 weekdays, 10 to 6weekends, every day, except ChristmasDay. This might seem like a too tightschedule for its workers, until youremember that the Air Force itself is

open 24 hours a day, every day,including Christmas day.The United States Air Force Museum

thus makes it possible for you to stroll inair conditioned/heated comfort throughthe pages of aviation history, civilian andmilitary, its people and its machines.

to page 139

48

resulted In this eye catchingStand-Off Scale version of Burt

popular home-bulit oana^

49

One of the most spectacularairplanes to appear on thehomebullt scene has been Burt

Rutan's Varieze. The aircraft is unusual

for both its composite structure(fiberglass over foam) and its canardplanform. In addition, the Varieze hasunusually high performance relative toits modest power. Since I live close toOshkosh, Wisconsin, where the E.A.A.annual convention is held, I have beenable to inspect the plane and watch it fly.It is every bit as spectacular in the air asit is on the ground. Last year there werefour or five Varieze's at Oshkosh and the

workmanship on all of them matched theusual pattern R/C model. Also aforthcoming space epic movie will use asmall fleet of the Varieze as space stylefighter aircraft.When the Varieze first appeared, I

looked at it from the point of view of anR/C model but decided that there were

too many unknowns. About a year later, Iread an article in the E.A.A. magazineSport Aviation mentioning that Mr.Rutan had been an R/C modeler formany years. Being rather quick torecognize a truth, I decided that he hadprobably built and flown a lot of canardR/C models. Armed with this knowledge,I proceeded to build a quickapproximation to a Varieze. True to theoriginal Varieze, I put a Vector Directoron the front canard to give both aileronsand elevators via the canard surfaces.

When launched, this model wouldinitiate a slight bank and never recoverfrom the turn. I promptly shelved themodel.

The next flying season, I noticed thatMr. Rutan had added ailerons to the

main wings and turned the canardsurfaces into elevators, so I did likewise.On the next test flight, I launched fromthe top of a hill. The plane went outstraight as an arrow. Application ofailerons yielded the fastest roll I had everseen. However, it still wouldn't turn andonce the nose dipped below the horizon,there was no recovery. Knowing that Iwas making progress, I re-read thearticles on the Varieze and noticed thatthe wing tip rudders only movedoutboard to create drag for turningpurposes. I also decided my canard wastoo small and increased its area by athird. The next test flight took me bysurprise — the plane flew perfectly! Itwould turn right and left, loop, would notstall, still rolled like mad, and had asmooth stable glide. After a few flights, Idecided to disable the "kick-out"

rudders and fly a pylon race. On the firstturn, I discovered again that, without therudders, it wouldn't turn — and scratchone model. Although the "SchoolyardCanard" (ROM, May 1978) would flywithout these rudders, the presentmodel will not, for reasons that escapemy limited knowledge of thingsaeronautical. However, it does fly. Nowthat the concept had been proven, all

50

VARIEZE

Designed By : Frank B. Baker

TYPE AIRCRAFTStand-Off Scale Canard

WINGSPAN

' 37 Inches

' WING CHORD

6V8 Inches

TOTAL WING AREA

221 Square InchesWING LOCATION

Shoulder WingAIRFOIL

Semi-SymmetricalWING PLANFORM

Swept and TaperedDIHEDRAL, EACH TIP

IVa Inches

OVERALL FUSEUGE LENGTH29 I nch6S

RADIO COMPARTMENT AREA

.(L)li"x(W)23/8"x(H) 2%"CANARD SPAN23 Inches

CANARD CHORD (incl.elev.)4 Inches

CANARD AREA

78 Square InchesCANARD AIRFOIL SECTION

Flat Bottom

CANARD LOCATION

Shoulder Position

VERTICAL FIN HEIGHT

6% Inches

VERTICAL FIN WIDTH (Incl. rud.)3V2" Average

REC. ENGINE SIZE

.049-.051 Cu. In.

FUEL TANK SIZE

1 Ounce

LANDING GEAR

TricycleREC. NO. OF CHANNELS

2

CONTROL FUNCTIONS

Ail,. Elev,, & Kick-Out Rud.BASIC MATERIALS USED IN CONSTRUCTION

Fuselage Foam, Ply & BalsaWing Foam & Balsa (Ace wings)Empennage BalsaWt. Ready-To-Fly 28 OuncesWing Loading 18 Oz./Sq. Ft.

that remained was to build a pretty,Stand-Off Scale version to replace thebalsa box prototype. The resultingStand-Off Scale version is the subject ofthis article.

CONSTRUCTION

Due to the use of foam wings andrather simple framework, theconstruction of this model is

straightforward. First, let me justify therather sturdy fuselage. With the longspan canard out in front, its tips tend tohit the ground if one makes a badlanding and they snag doorways. As aresult, considerable stress is placed onthe fuselage. My prototype fuselage of3/32" sheet proved to be very fragile.The 3/16" sides on the present versionare quite rugged and eliminated thebreakage problem.The fuselage is basically a box which

is built upside down on the work benchas the top is flat. When installing thefirewall, check to insure there are 2°built-in down thrust. Also, glue in thetriangular plywood wing hold-downplates so they clear the fuel line holesand the motor mount bolt holes. You

may need to do a bit of carving to insurethe proper clearance. The main landinggear is 3/32" music wire held in aplywood sandwich. Install the landinggear before gluing on the 1/4" sheet thatgoes from the nose block to the firewall.Glue on the nose block and carve it to

rough shape. It will be final shaped afterthe canard is mounted. The canard is

built from one piece of hard 3/8" balsasheet and the elevators are 1" trailingedge stock. I made the elevator horn outof 3/32" music wire and brazed a brass

strip at the center. A Veco U/C elevatorhorn could be used; the important thingis that it be as long as shown on theplans to minimize the throw. Carve andsand the canard airfoil to a Clark Y with

the rounded front about 1/8" above the

bottom line. This provides the necessaryfront canard incidence. Mount the

canard and use a level to insure the

bottom surface is at 0°, also check to seethat it is horizontal and perpendicular tothe center line of the fuselage. Install thetop balsa block and do the final shapingand sanding of it and the nose block.Use a razor saw to cut off the nose block

where shown on the plans. Cut a 7/8"square 9/32" deep recess into the block.Make the nose gear out of 3/32" musicwire and glue it into the 3/32" plywoodsandwich. Glue this plate in the noseblock recess and then glue on the tip ofthe nose block. A bit of final sanding willbe needed. Now set the fuselage aside.The wing is constructed of a 6"

straight section of Ace 1/2A foam wingand two taper sections. Cut the tapersections as shown on the plans andplace all three sections together on atable. Use a pencil to draw in the sparline on the top and bottom. Also be sureto check that the outboard ends are

parallel to the center line of the wing. Cut

Landing gear sandwiched between two pieces of plywood. Nose blocks rough carved. Needs additional tip block and finalfilling and sanding.

Six Inch center sect/on of Ace constant chord wing shows spar,trailing edge and Sullivan Gold'N-Rod and cable installed.

Aileron horn and rudder "kick-out" linkage. Linkage on both tipson bottom side.

Rudder "kick-out" linkage shown with aileron cable hooked up. Rudder with .025" music wire to hold tension on rudder.

the grooves for the 1/8" square sprucespars on top and bottom. I used threebrass gears in a mandrel and my Dremelsaw power take-off cable, it will cut asmooth notch. Block up the tips of theouter wing panels and sand theinboard edge until it is perpendicular.Glue the 1/4" square trailing edge sparand then the 1" trailing edge stock to thecenter and two outer wing panels. Nowuse epoxy to glue the wing panelstogether. Before the glue sets, check thedihedral and the match of the panels toprevent twist. The 1/8" square sprucespars are glued in using white glue. Donot crack or cut them at the dihedral

break; they will bend around thesepoints easily. Now use two gears in yourDremel tool to cut the 1/16" slot for theaileron control cables. Install theailerons and the 1/16" plywood

ABOUT THE AUTHOR

Frank B. Baker, age 50, has been flyingmodels for 43 years and has been in R/C since1954. He Is a member of the Madison Area Radio

Control Society (MARCS) that also Includes wellknown designers Owen Kampan and RomeyBukholt on Its roster. Two previous articlesauthored by Frank were published by ROM, arudder only B-24 and a Stand-Off Scale P-51presently kitted by Fllteglass. His major interestin R/C is multl-englned 1/2A scale and a B-29,B-25, B-26 and a P38 are currently flying. Whennot engaged In R/C, Frank Is a professor ofEducational Psychology at the University ofWisconsin. In 1969, he rebuilt a full-size PiperJ-3 and Is well known locally for his numerouscross country adventures In his Cub.

reinforcing plate on the top and bottomof the wing tips. Build the rudders out of1/8" sheet and install the return springs.These springs should be very light andhave just enough pressure to return therudder to neutral. Then glue the ruddersonto the ends of the wing.The only sneaky part of the whole

airplane is the rudder "kick-out"mechanism. The basic principle is thatup aileron actuates a wire lever thatforces the rudder outboard while down

aileron moves the lever away from therudder which is held in neutral by thereturn spring. The slot in the nylonaileron horn allows the other end of the

lever to move freely in the properdirections. The wire lever is built as

follows: clamp a piece of 3/32" musicwire in a vise and then wrap a section of

text to page 135

51

FULL SIZE PLANS AVAILABLE — SEE PAGE 187

TYPICAl. FINISHED

CROSS SECTION OF

WHEEL PANTS

J/32" PLYWOOD

MAKE TWO

ACE l/EA STYROFOAM WINS

(CONSTANT CHORD TYPE)-

FOR CENTER SECTION

AILERON HORN ILARCiE MIDWEST OR

GOLDBERC) MODIFIED AS SHOWN.

MAKE ONE RIGHT-HANDED ANO

ONE LEFT-HANOED.

I/I6 PLY-

TOP ONLY

rTRAILING EDGE STOCK

1/4"Sa BALSA

SMALL XLETT HINGES

OVERLAP CABLE ENOS

ANO SOLDER TOGETHER

— — —

-—- —.

r—

\0RAIDEO

CABLE

I

-J

l/}6 PLYWOOD AILERON SERVO

MOUNT (RECESSED AS PER SIDE

View BELOW)

^—

^5"5^3

-=

OUTER PANEL IS TRIMMED TO SIZE

SHOWN USING ACE l/ZA TAPERED

STYROFOAM WING

HALF-SIZE DIHEDRAL DETAIL

REAR

VIEW O

F WI

NG J_

— r

AILERON PUSH ROD CABLE- SULLIVAN

•GOID-N-HOO'ICODE OHC-3, STOCK

NO. 507}

AILERON SERVO LINK-1/2 ARM SOLDERED TO AILERON PUSH ROD

CABLE. RIGHT END BENDS DOWN 3/1

6'.'

THEN BACKWARDS 7/l6r

REAR-FACING ARM ENCAGES AILERON SERVO OUTPUT WHEEL

3/6"HARD BALSA SHEET H-

SMALL KLETT HINGES^

YELLOW

PLASTIC

TUBING

AILERON HORN

\ R

UDDE

R'KI

CK-O

UT'L

EVEH

-I

l/IE'MLiSIC WIRE

-|. .1 __

-]r.\

Ui-!l

7^

I'TRAILING EDGE STOCK

VSS'OIA. MUSIC WIRE

NOSE TIP 9L0CK-

7/8"XI

I/9"

XI-l

/e'L

-HARO BALSA

KRAFT-HAYES

K-M O.S MOUNT

3/16" BALSA SHEET SIDES

\..

-AFT SECTION OF STRAKES SHAPED TO

MATCH LEASING EDGE OF WING (SEE SIDE

VIEW). DO NOT GLUE STRAKE TO WING.

RETURN SPRING

RETAINER-S/ie"

BALSA SHEET

h;

JuU

COX'TEE-OEE"

049 OR .091

ENGINE

HATCH PARTING LINE

l/e'OIA. DOWEL

STYROFOAM CANOPY/HATCH

./

STYROFOAM BLOCK

1/16" PLYWOOD

HORN

l/ie

'DIA

-MUS

IC WIR

E |

—

1

NOSE L G. STRUT-

3/32'MUSIC WIRE

NTRUE FLAT LENGTM-

(BEFORE BENDING PER

CURVE IN SIDE VIEW)

11/

4'* DtA. NOSE WHEEL

BRAS

S I

I 11

ELEVATOR

ievi f _

1I

■ -f—-

V8'* SALSA

CROSS BRACE

WHEEL PANTS CORE-1/2"BALSA SHEET MAKE 2

r DIA. SPiNNER

1,^' 3ULUVAN 1 U£. —

^j

,, SLA

NT TANK j

SWITCH HQ

ELEVATOR TRAVEL - - 1/4"UP AND 1/4

" DOWN

AILERON TRAVEL

l/4"UP ANO l/4"OOWN

$•1/

2"0«

A UAIN WHEELS

NOTE 2* DOWN-THRUST

— - ' .

cRISH'TORNADO' 5"DlA ,4 * P

iTCH PUSHER

^ PROPELLER

IS REC

OMME

NDED

©RCM- ALL COM

MERC

IAL RtOHTS RESERVED

VARIEZE

DESICNED BY FRANK BAKER

INKED BY PAUL PLECAN

1/16" PLYWOOD

PLAN NO. 764

The paint's dried, the radioinstalled and the engine runsjust right — we're ready to take

our latest "pride and joy" out to the clubairfield and see if it flies as good as itlooks. In our pre-departure checklistappears the item, "Check the CG." Nineout of ten modelers will wait until they getout to the field to check the final balance

of their models. It usually takes twopeople — hanging the model from bothwing tips — to see if the balance point is"on the front spar" as the kit plansindicated.

The two-finger balancing act is as oldas R/C and gives a rough idea of nose ortail heaviness. But, it isn't the mostaccurate system in the world! It's kindalike cutting out balsa wing ribs with anaxel Wide fingers give the falseimpression that the model is "right on."And ™ balance positions can vary morethan the 1/4" to 1/2" range indicated onthe plans! Of course, the conscientiousR/C modeler will try to balance his birdlaterally, too — to make sure that thewings are of equal weight. No sensehaving to hold full aileron during the firstflight, just to keep the wings level!

For the expenditure of about tenminutes time and very little cash, youcan build a duplicate of our "CG Finder."It takes a 10" piece of 1 x 2 pine and acouple of 3/8" or 1/2" dowels, Cut thedowels to the same length and trim themto the round pointed wedge shown in ourphotos. Draw a centerline on the 1 x 2and drill a couple of holes (square andstraight!) about 6" apart. Stick thedowels in the holes, line up the wedgepoints with the centerline and you'reready to balance your model!Dimensions of the device aren't critical— only alignment is. The dowels shouldbe long enough to allow a high wingmodel to hang free during the balancingprocedure (6"-8"), and to clear the fixedgear on a low winger. The holes in the1 X 2 will hold the dowels in a friction fit,but you can epoxy things together, if youwish.

To use the CG Finder, simply hang thebird across the dowels until it balances.

You can do the job all by yourself — to amuch greater degree of accuracy thanthe old "two finger" method.

While we're at it, let's considerfourteen "truisms" about R/C modelbalancing. Read 'em, apply 'em — andyour model will fly better!(1)lf a model is out of balance,

longitudinally, the farther from the pointof ultimate balance that weight is added,the lesser that weight may be. In otherwords, a small weight on the propellershaft or under the engine will balancethe bird if it's tail heavy — rather than aheavier weight in the tank or radiocompartment. A nose-heavy model canbe balanced, with a minimum of addedweight, the further toward the tail youplace the weight.(2) Once the proper balance of a

CG OR NOT

CG ...THAT

IS THE

QUESTION

model is achieved (by adding weights)the weight should be bolted, screwed orepoxied in place to make sure It doesn'tcome loose in flight! And — consider theweight that is added by the bolt, screw orepoxy!(3) When the model is properly

balanced, mark the balance pointsomewhere on the fuselage or wing —with a piece of tape, contrastingcovering material, pencil, pen or "magicmarker." Then if the model requiresrepairs at a later date, you canre-balance it at the proper point withouthaving to dig out the plans. Thebalancing line can be drawn on afuselage wing saddle or Inside thefuselage to mark the point,unobtrusively.(4) A good way to balance a model,

laterally, is to balance the uncoveredwing or wings. Covering materials,particularly the heat-shrink films, addweight to a wing rather evenly.Balancing with the wing uncoveredallows you to hide the balance weight.Of course, a final lateral balancing of theR/C model should be done with the

model ready for flight.(5) Balance any model without fuel in

the tank. This will result in a bird that is atad noseheavy at take-off. But — thebalance will represent the best possiblecondition for the model — on landing —when the fuel is low.

(6) Most kits and scratch-built modelinstructions advise the builder tobalance the model, using components ofthe radio. A couple of factors make this adifficult task. First, the sen/os must bemounted on fixed bearers (or the servotray must be) so using the radio tobalance the bird will give you only arough approximation. Second, manymodel designs don't provide the spaceat the right places for a radio installationthat'll really balance the model. Thereare big and little battery packs, miniatureand full-sized servos and a host of

receivers of varying weight and size.

By Col. John A. deVries

Stick 'em where they'll contribute to thebalance of the model but add weightwhen it's needed!

(7) Changing a prop may affect thebalance of an R/C model. It's kinda

"nit-picky," but going from nylon towood, or vice versa, can goof-up a wellbalanced model. Using the CG Finder,it's easy to re-balance. As a corollary tothis "truism," it's only smart tore-balance a model that has undergonemajor repairs!(8) Retracts affect both the

longitudinal and lateral balance of amodel having them. Check the CG withthe gear extended and retracted tomake sure it stays in the designedrange. If you're faced with the problem ofhaving to choose a balance point for aretract equipped model, favor the geardown CG. A model's laalance is most

critical at low airspeeds — which are"seen" at take-off and landing.

(9) Ninety-nine percent of the plansfor R/C models, from all sources, show abalance point. And, just as often, thebalance point Isn't the model's Center ofGravity! The CG is somewhere up ordown a line drawn through the balancepoint but its exact location is seldomshown on model plans. Modelers wouldbe surprised if the real, physical CG wasshown because, sometimes, it'soutside the physical structure of themodel! From a practical viewpoint,balancing the model as indicated on theplans will result (usually) in a bird that willfly properly.(10) All of us know that aft CG's

usually produce "twitchy" models so —particularly for first flights of new models,balance the bird in the forward part ofthe balance range (nose-heavy).Pattern fliers know that it takes a

slightly aft CG to permit their models tosnap and spin properly. But, a snap onthe final Is not something a beginner ornew modei driver really needs!(11) We've all seen the odd model at

to page 134

53

AN INSULATED FLIGHT BAG

"takes out the NUMB

and puts back the FUN

in cold weather Hying"!

BASIC MATERIALS REQUIRED

1/2 yard Parka (guUted snowmobile)Fabric and a 16" Zipper,

optional: 1 pair of Knitted Cuffs

By Bob Wallace

ASSEMBLY SEQUENCE

ifi!

step i

CUT PIECE OF PARKA MATERIAL

18" X 36"

Step 2

FOLD EDGES OVER 1/2" ANDSTITCH.

Step 3

STITCH BUTTON HOLE (CENTEREDIN BAG MATERIAL) FOR ANTENNAEXIT. CUT SLIT IN CENTER OF

BUTTON HOLE.

STITCH BUTTON HOLE FOR TRAINER

CORD EXIT (IF DESIRED). CUT SLITIN CENTER OF BUTTON HOLE.

Step 4

FOLD BAG MATERIAL IN HALF WITHSTITCH EDGES OUTWARD. MARK HANDOPENINGS (3" FROM BOTTOM OF BAG).STITCH SIDES UP TO AND BEYONDHAND OPENINGS. TRIPLE STITCHHAND OPENING EDGE.

step 5TURN BAG FINISH SIDE OUTWARDAND INSTALL ZIPPER IN BOTTOMOPENING.

PUT ON YOUR "LONG JOHNS' ANDGO FLYING,

I am an ardent R/C enthusiastwho has not been blessed with

the good fortune (some wouldcall it wisdom) to live in an area that isconducive to year round flying. The cold,snowy winter months have long been aperiod of limited flying: a time spentprimarily in building new aircraft for the

coming season. While one can dress ina sufficiently warm fashion to ward offthe winter cold, keeping your hands frombecoming numb while flying has alwayspresented a perplexing problem. What isa 10 or 12 minute flight in the summer iscut short to 2 or 3 minutes, due to handsthat rapidly lose all feeling due to the

cold. No matter how good yourcirculation may be, clutching a metalencased transmitter in sub-freezingtemperatures is guaranteed to quicklytake the joy out of flying.

Flying with mittens or gloves on is veryrestrictive. If the gloves or mittens arewarm they also destroy all "feeling" for

the sticks with their bulkiness.

The answer to this dilemma was

provided by the creation of theTrans-Mitt, an insulated muff type baginto which the radio transmitter is placedand the hands inserted via cuffs or slit

openings. The transmitter bag conceptwas originated in 1976, by Pete Reed ofPlainville, Connecticut. Pete is anationally recognized pylon racer andwhen it comes to building, flying, andR/C knowledge — Pete Reed is one ofthe best.

Pete's original bag was fashionedfrom nylon windbreaker material. Thisbag worked very well and lead to thetype shown in this article, which isconstructed from nylon parka material.

Nylon parka material, which issometimes called quilted snow mobilecloth, is readily available in most fabric

stores. It is nylon on both sides with apolyester insulating filler in the middle. Itis stitched in either a lateral or quiltedpattern, comes in a larger variety ofcolors, and is washable.

This material comes on a 42" wide roll

and sells for $4.95 per running yard. TheTrans-Mitt is light in weight, very warm,and does not restrict hand-transmitter

stick movements in any way. Inextremely cold weather a pocket typehand warmer can be inserted in the

Trans-Mitt for additional warmth. Either

the fuel stick or fluid type work equallywell.

I have flown in below zero weather

and can assure you that when using aTrans-Mitt bag your hands will come outof the bag at the conclusion of the flighteven warmer than when you insertedthem. The Trans-Mitt bag also serves as

9.

o

an excellent padded storage bag foryour transmitter when not in use andkeeps it dry and free of dirt and snow atthe flying field.The only materials needed to

fabricate a Trans-Mitt bag are a 1 /2 yardpiece of parka material, a 16" heavy dutynon-separating zipper and nylon thread.Knitted cuffs can be added if desired. I

personally believe slit openings aresuperior as they make hand entry intothe bag much easier. The total cost ofmaterials is approximately $3.50. If yoursewing talents are as limited as mineare, an ideal method of acquiring aTrans-Mitt bag would be to take yourwife, girl friend, mother, sister, daughter,etc., out to dinner and just "happen tostop by" the local fabric store on the wayhome. (For dinner and a movie you mayget your name or initials embroidered onyour bag!)

In constructing a Trans-Mitt bag,velcro (hook and loop) type closingstrips can be used in place of a zipper.The use of a clear vinyl window in theface of the bag (to view the transmitter)should be avoided as it greatly reducesthe insulating value of the bag.The only use limitation of a Trans-Mitt

bag is in regard to instructing a beginnerwithout the benefit of a trainer cord.

Obviously, passing the transmitter toanother flyer is all but impossible when itis inside such a bag.

Winter flying sessions that wereformerly comprised of 2 or 3 abbreviatedflights due to "numb thumbs" can nowbe as lengthy as you choose to makethem. If you are an RC'er who lives in apart of the country where thetemperature dips below the freezingmark, the Trans-Mitt is an accessoryitem you won't want to be without. Use itonce and you'll be convinced. □

2

etween the wars was a

romantic period In aviation formodelers and, although 1 have

never been a scale buff, some of thatromance has rubbed off. Memories ofthe thirties, when military aircraftparticipated in airshows along with the"stunt flyers," are still fresh. Of course, Iwas Very Young then and most of myinformation came from the pulpmagazines that littered the shelves atthe drug store. Semperfi is an attempt tocapture some of the yellow-wingedmilitary mystique of that time in an easyto build and fun to fly airplane.

Since most airplanes of that periodhad conventional landing gears, so doesSemperfi and it is a compromisebetween scale looks and practicaloperation. The result Is an airplane thatthese aging reflexes are able to keep onthe runway, even in a crosswind. In fact,after a bunch of flying the only propdamage has been slightly round tipsfrom nose-low landings.

In the air it is a solid airplane and notgiven to bad habits. It will snap and spinbut these are controlled maneuvers andnot accidental ones. Although invertedpasses and loops are comfortable,outside snaps and spins are not its bag.The roli rate is good and makes even themost uncoordinated of us look good. Arolling break to an overhead 360°approach, like the airshow boys did it, is

easy and impresses the Sundayonlookers. Wheel landings are just aseasy as stall landings and look great asthe tail comes down to three pointposition.When building Semperfi, or any

airplane, think light. There is no way abrick can perform like an airpiane, andthis is an airpiane not a brick.

CONSTRUCTIONWing:Cut the wing ribs from medium 1/16"

sheet balsa (all wood is balsa unlessotherwise stated): pin them together andgang sand them to the same outline.Select six from the batch and cut themain spar notches 1/8" wider on eachside to accept the dihedral braces andtrim 1/16" from the top and bottom ofthem for the center section sheeting.Call these ribs R1. Cut the webs for the

main spars and the trailing edge from1/16" sheet; the grain should runvertically. The trailing edge sheeting is1/16" sheet and the trailing edge is 1/8"square.

Cover the plan with plastic sheeting orwaxpaper to keep the glue from stickingand assemble the wing right over theplan by laying the trailing edge sheetingand the bottom main spar in position onthe plan. Glue the trailing edge on theback edge of the trailing edge sheeting.Start the assembly with the second R1from the center, install it and the

webbing next to it (on both spar andtrailing edge); install the next rib followedby the webbing, another rib, etc., out tothe tip. The webs help with the spacingas well as keeping the ribs perpendicularto the spars. The ribs should be glued inas you go. Glue in the two top spars andthe leading edge, then remove the winghalf from the plans and glue in the otherbottom spar. Do not add the top trailingedge sheeting at this time.The other wing half is built just as the

first by turning the plan over and buildingit on the back side. The plan can berubbed with cooking oil or sprayed withspray-wax to make it transparent.When both halves are complete,

bevel the ends of the spars, leading andtrailing edges to fit together at thedihedral joint in the center, and join themwith the plywood dihedral braces. Cuttwo RTs apart at the aft side of the mainspar notch and install them on eitherside of the dihedral joint, as shown, toform the servo box. The leading edge ofthese ribs are cut in front of the sparnotch and joined together at the center.The trailing edge sheeting is now addedand the center section sheeted with1/16" sheet. Do not sheet the top of theservo box. The brass tube aileron torquebearings, with their torque rods, areepoxied to the trailing edge on eitherside of the center section and faired withpieces of 1/4" square soft balsa that

56

SEMPERFI

Designed By : LF. (Randy) Randolph

TYPE AIRCRAFT

SportWINGSPAN

48'/2 InchesWING CHORD

Root 73/4"'—Tip7Vz"TOTAL WING AREA

366 Square InchesWING LOCATION

Low WingAIRFOIL

Flat Bottom

WINGPLANFORM

SweptT.E. (slight)

DIHEDRAL, EACH TIP1 Inch

OVERALL FUSELAGE LENGTH35'/s Inches

RADIO COMPARTMENT AREA(L) 8V4" X (W) IVi X (H) 4"

STABILIZER SPAN

18 Inches

STABILIZER CHORD (IncI.elev.)5%" Average

STABILIZER AREA

95 Square InchesSTAB AIRFOIL SECTION

Flat

STABILIZER LOCATION

Mid-FuselageVERTICAL FIN HEIGHT

5 Inches

VERTICAL FIN WIDTH (incl.rud.)5" Average

REC. ENGINE SIZE

.15-.25 Cu. In.

FUEL TANK SIZE

4 Ounces

LANDING GEAR

Conventional

REC. NO. OF CHANNELS

4

CONTROL FUNCTIONS

Bud.. Elev., Throt., Ail.BASIC MATERIALS USED IN CONSTRUCTION

Fuselage Balsa and PlyWing Balsa and PlyEmpennage Balsaand PlyWt. Ready-To-Fly 36-40 Oz.Wing Loading 16 0z./Sq. Ft.

have been hollowed to receive the

bearings. The ailerons are 1/4" aileronstock that has been tapered at the tip.Make them full length and cut 2" from theoutboard tip of each and glue thesepieces to the trailing edge of the wing ateach tip. The ailerons themselves will beinstalled when the airplane Is covered.Cut the wing tips from 1/4" soft balsa,glue them to the tip ribs, and sand themto shape. Round the leading edge andsand the whole wing with 150 gritsandpaper.Fuselage:The fuselage sides are cut from two

pieces of 3/32" x 6" x 36" medium balsa.These can be purchased or made byedge gluing four sheets of 3" stock toform two pieces 6" wide.Gut out the two sides, pin them

together and sand them to the sameoutline with a sanding block. Use thefinished sanded side as a terhpiate to cutthe two 1/16" plywood doublers. Epoxythe doublers in place, one left and oneright, and again pin the sides togetherwith the doublers on the outside and

sand the edges square. While the sidesare still pinned together, drill the 1/4"holes for the wing hold-down dowels andmake the cut-outs for the stabilizer and

wing. Save the bottom of the wingcut-out as it will be glued to the bottomcenter of the wing to form that fairing.Cut the notch just forward of the wing toreceive the landing gear mounting block.Separate the sides and add the 3/16"square balsa uprights and longerons,the 1/16" balsa cabin doublers, and thesen/0 and tank mounting rails.

The firewall and first bulkhead are cut

from 1/4" plywood and the aft bulkheadis 1/8" plywood. Drill the firewall for thethrottle line, fuel lines and enginemounting bolts. Install T-nuts for theengine mount and epoxy them in place.Glue the two bulkheads in place on oneof the fuselage sides; make sure theyare square and glue the other sidedirectly over the first. Use a square andmake sure that both sides are exactly inline. Glue the sides together at the tailand install the firewall and check that the

fuselage Is true with no bends or twists.Glue the landing gear mounting block inplace and add the two pieces of 1/4"plywood above it on each side. Thesepieces are glued to the fuselage sides aswell as to the 1/4" plywood bulkhead.

text to page 128

57

m

(1) The fuselage "kit" ready for assembly. (2) Fuselage sides with cabin doublers, tank and servo rails added. Cabin bulkheads are firstglued to one side in preparation for assembly. (3) Firewall installation. The sides are notched to receive the landing gear mount, torqueanchors are added above the mount and the mount and anchors drilled to receive the landing gear. (4) Fuel tank is installed with foamwedges after throttle line is epoxied through firewall and into cabin. (5) Foam wedge above tank completes installation and final sheetingcan be done. (6) The two ribs on both side of the center section are notched at the main spars to allow installation of the dihedral braces.(7) The completed center sect/on ready for sheeting, trailing edge top sheet has now been installed. (8) Wrap bond paper around part ofsanding block to form tips, the paper keeps the sandpaper from changing the airflow at the tip.

^9^ TemporarUy hold wing in position on fuselage to build bottom fairing on wing. Fairing is formed from the bottom sections of the sideswhich were cut out to make the wing saddie. (10) Complete wing to fuselage fairing. Aileron hardware can now be installed. (11) Aileronhardware Installed and ailerons notched and drilled to receive aileron torque rods. Do not install ailerons until they are covered.(12) Elevator, stab and rudder, fin ready for cover. (13) Detail of bottom of rudder, notched to receive plywood insert for tail wheel tilleranchor. (14) Radio installation, battery and receiver forward, servos aft. (15) Taii wheel installation. (16) SEMPERFI.

FULL SIZE PLANS AVAILABLE — SEE PAGE 187

l/ie^SHT WEB

ALL GUSSETS

3/l6"SHT

1/4-SO LE

1/16" SHI TBB

3/6" SO. SPARS

3/16'X ^

I/I6" PLY

WEB

3/8-HBD

1/4" PLY

SPARS

(DRILL FORENOINE

MOUNT BOLTS

BETORC INSTALLM)

1/8* SO

HINGES

1/8" PLY

AILERON 1/4-SHT. '-

= =

( -l/8-BRASS

^ TU

BEI/I6"SHT TOPS. BOTTOM

3/16 *SHT

1/4" S

Q.

^3/32- WI

REDIHEDRAL I" EACH TIP

3/16-

OOWEL

tSV Lv-

-RIBS

1/16" SHT 26 REQ

W2 I

l/B-

PLY.

3/l6"S0

TRIM SIX TO BROKEN LINE 1/32- WIRE

TIPS 1/4- SOFT SHT

m^/4" DOWEL WING HO

LD DOW

NSNOTE-- FUSELAGE TOP NOT SHOWN TWS VIEW

INNER NYROD TO THROTTLE

I RC

VR4 OZ. TANK

aVlN

dKE.

-'3/16

3/8"

ALL CROSSBRACES 3/16' SO

SHEER WEBS

TE

!'■ '

I ' '.'

I1/16- SHT

3/16-x

RUDDER

CABIN DOUBLER 1/16" SHT

1/16- PLY

6 ROD

3/16"

SHT

,, 3/6" SO

/L^

HINGES

THROTTU

RCVR

NYrSODS

3/6' -

GUIDES

1/16'PLY

1/6 "PLY

SOLDER EYELET

1/6* WIRE

TRIMTAIL WHEEL BRACKET

AS SHOWN

U-BRACKET

1/16-PLY

ALL LONGERONS &

UPRIGHTS 3/6" SQ

1/4-pLY

FUSELAGE TOP & BOTTOM

J/16

- SHT, CROSSGRAIN

MOVE SERVOS FORE OR AFT

NOTE: FUSELAGE LEFT SIDE S DOUBLER

FOR PROPER C.G.

NOT SHOWN TrtS VIEW

T= DENOTES 1/16-PLY DOUBLER

I" DIA

LG. STRAPS

LANDWQ GEAR

l/8-W»?E

2 ROD

SEMPERFI

2-DIA

NOTE: ALL PARTS BALSA UNLESS OTHERWBE NOTED

SOLDER

WASHER

PLAN NO. 705

^Qcllo Spectrufn.iisi222iL:°

D-L^Mb

efore we get into this month'sI subjects, I'd like to say a fewwords about some things we

published in the last few months. Thebridge circuit that was recommended toprovide protection, against connectingcircuits with the wrong polarity, willprotect the circuit as claimed but couldprevent the circuit from operating asoriginally designed. This is due to thefact that diodes have a forward voltagedrop as opposed to being ideal devices.For instance, If you put a bridge betweenyour receiver and your airborne batteryyou could expect to have a lower voltageon the receiver and possibly a reducedsensitivity. In addition you would have allkinds of noise on the power line due tothe servo current fluctuations causingthe voltage across the diodes tofluctuate. Not a thing you want in yourairplane. In other circuits, the bridge canalso cause troubles. If you put a bridgebetween your Astro-Flight or S & O fastcharger and your battery for example,you wouldn't get much of a charge. So aword to the wise. Understand the circuit

you are trying to protect before addingdiode protection.The other subject that requires

clarification is that of curing big airplaneproblems by using Ffvl equipment. Mostbig airplane problems are caused byIgnition noise and/or noise caused bylots of metal to metal contacts. The FM

will take care of the problems verynicely. There Is another "big airplane"problem associated with flying wires,metal struts, and long servo leads thataffect the system. It is not obvious thatFM will overcome a situation where the

antenna system is being fouled up. We'dappreciate hearing from anyone whohas any experience in this area. Thesubject of antennas seems to be comingup more and more these days so Ithought we might discuss them thismonth, not so much to offer any curesbut to spur a little more experimentationand reports from our readers. Most of ushave become complacent because the30" piece of hook-up wire works fine andfits in our pattern and sport airplaneswith no difficulty. However, we are nowseeing tiny airplanes with .02 and .049engines as well as monsters with theaforementioned "bird cages"surrounding the antenna. At Las Vegaswe saw an interesting antenna on a

pattern plane in order to avoid anyproblems due to the internal tuned pipe.We asked for a write up on it and hope topresent it in a future article.

Antennas

Dear Jim:

One subject that has recieved little (orno) comment in your column is receiverantennas. To jog you into writingsomething, I'll ask a few questions:

The obvious one is, what do i do withthe antenna in an 020 poweredmini-modei? if i chop it off and retunethe antenna coil, what am i losing inrange? What else could I do?Back in the September 1966 RIC

Modeler, Jack Wiershauser wrote whatappears to be a good article on thissubject (copy enclosed). He suggesteda central loading coil, i note that Kraft isselling a gimmick like this. Whatapproach are they using?

There are lots of similar questions(i.e., antenna in the wing?) that need agood up to date discussion. How aboutwriting one?

Sincerely,Ted Off

Ventura, Calif.First of all I'd like to say we have talked

about antennas before and

recommended that you go to a verticalwhip on your plane if you are havingtrouble. This is probably more Importantas you start shortening your antenna.But let's look at what we are trying toaccomplish with a receiver antennabefore we come to any conclusions.Most of the following was lifted from a

paper submitted to RCM byG.B. Herzogof Princeton, N.J. who many wi llremember as an early pioneer in R/Cand particularly in proportional. Thepaper, as written, applied to 27 MHz andMr. Herzog offered to update It for 72MHz. I'm not sure what happened but I

for one would love to see it. So if this

magazine makes it all the way to NewJersey, maybe we'll entice Mr. Herzog toget out his typewriter.The transmitter antenna is designed

to establish a strong radiated field in thevicinity of the receiver. The receivingantenna must extract enough energy toprovide adequate signal for the receiver.Most receiving antennas take the form ofa wire from the forward part of thefuselage up to the vertical fin. When theplane is flying directly away or directlytoward us this antenna can be oriented

along the pointing vector from thetransmitter antenna. The radiated wave

has voltage and current componentsthat are at right angles to the pointingvector. No signal lies on this vector andtherefore no signal can be induced in areceiving antenna parallel to this vector.Now don't quit flying, because,fortunately the plane Is never exactlyoriented this way and all parts of theantenna are not in a straight line.Furthermore the metal in the planedistorts the field which helps induce asignal Into the receiver.

Mr. Herzog ran field tests with atelemetering system to establishantenna performance and the resultsindicated that the wire to the fin was

grossly inferior to the vertical whip formost flying conditions. With the verticalwhip on the plane and at a range of 400feet he had to collapse the transmitterantenna to find any appreciable nulls.With a horizontal antenna on the planehe could find nulls where the received

.045 WIRE15 TO 16 INCHESLONG

E-F. JOHNSON.

JACK

e.F. JOHNSONPLUG

TOP OFFUSELAGE

, POWERPLUG

RECEIVERBATT.

#24 WIRE

SAME LENQTO

AS WHIP

30" GROUNDPLANE

WIRE

FIGURE 1

61

signal was essentially zero with thetransmitter antenna fully extended.The 1966 RCM article by Mr.

Weirhauser recommended a tunedantenna, and a ground plane wire. Againhe was working on 27 MHz and a quarterwave antenna would be 9' long. A shortantenna (less than quarter wave) can bemade to look like a quarter waveantenna by tuning it with a loading coil.He recomm'ended a center loaded

antenna with the loading coil mountedon top of the fuselage and vertical wireextending from it wth a flexible wire ofthe same length inside the fuselage. SeeFigure 1.The loading coil must have enough

Inductive reactance to cancel thecapacitive reactance of the shortantenna. At 72 MHz, a quarter waveantenna must be 3,4 feet long. So theusual hook-up wire isn't too far off, nor Isthe antenna Illustrated in Figure 1 withno loading coll. However, if you wantedto cut it down, the loading coil might bethe solution. You could do a lot ofcalculations but the best way to go abouttuning an antenna is with a grid dipmeter. The author suggests that nomods are required to the receiver butthis is probably dependent on thereceiver design. He suggests the bestmatch can be achieved by adding a 2-3turn link at the cold end of the inputtuning coil as shown in Figure 2, if yourreceiver doesn't already have thisconfiguration.

LOADING

COIL

HECEtVER

TURN

1FIGURE 2

Before you get too excited, read whatMr. Herzog says. "We can improve thereceiving antenna by providing a groundplane and by appropriately tuning withloading coils. This would make thereceiving system more sensitive andmight be used as a means for reducingthe required transmitter power. It would,however, at the same time, make thereceiving system more sensitive tointerfering signals on the same ornearby frequencies." He recommendsimproving the transmitter antennaefficiency and leaving the receiverantenna somewhat inefficient, providingthat it doesn't have any serious nulls.We've previously discussed that theplace you can expect to have problemsis down low and far out and that In mostcases you will be flying level in that case.

Therefore the vertical whip, even thoughIt Is short, is the way to go vs. a longerantenna in the wing. What we are sayingis that polarization is more importantthan having the proper electrical length.Now the problem with cutting part of

the antenna off is that the antenna

capacitance will change and thereforeaffect the front end tuning. In fact it maynot tune at all. Again, it depends on thefront end design.

I recently received the completeseries of articles on Terry Platt's FMsystem that appeared in RCM & E inEngland, courtesy of Mr. N.R.Chippendale of Ottawa, Ont. Terry hasan interesting solution in the form of anFET RF amplifier that acts as a bufferbetween the antenna and the first tunedstage. See Figure 3.

V

FIGURE 3

Terry says it provides amplificationand allows any length of antenna to beconnected. He was concerned about nothaving any tuned circuits before theamplifer which could lead to crossmodulation with strong signals butexperiments have shown no sucheffects. Note that this is with his receiver;you might experience different results.The bottom line is that short antennas

will work but they will be less efficient soyou must take steps to make up for thisloss. You must also make sure yourfrontend is still tuned when you get done. I'msure there is someone out there who has

been through this exercise and maybe afew more will do some experimenting.Let's here from you.By the way, I hope to have more to say

about Terry Platt's FM system soon.Super Battery?

The following news release from"Spotlight" was sent in by Ken Kern ofBedford, Indiana. I haven't been doingany "hamming" Ken. Hope your newKraft FM system works as well as mine.

Super BatteryDeveloped By 'Ma BeW

A sensational new electric storagebattery destined to power theautomobiles of the 19d0's - and to

drastically slash the energyrequirements of our transportationsystem -has suddenly appeared on thescene.

The new battery has a very highspecific energy (or energy density): 200watt-hours per kilogram (wh/kg) -eighttimes as great as the lead-acid batteriescurrently used to power electric cars. Italso has very high specific power: 2.5

volts per ceil, or twice that of the nickelcadmium battery which powered thevehicles used in exploration of the moon-plus four times the energy density.

Also, like the nickel cadmium andlead-acid batteries, it is "cold" -that is.it works at existing temperature.

This breakthrough was developed byBell Telephone Co. at its laboratories inNew Jersey.

The negative electrode, or anode, ofthis super battery is lithium, the lightestof ail metals, and possessing a veryhigh electric potential. The positiveelectrode, or cathode, is vanadiumdisulfide, a mica-like substance that hasa maximum capacity to store electricions on either side of its razor-thin

layers. Used as the power-pack in anautomobile it represents only 20percent of the overall weight - asopposed to 40 percent for currentbattery-powered cars.

It will enable the electric vehicle to

travel more than 400 miles between

rechargings. Preliminary indicationsare that this battery is very durable, withan efficiency greater than 80 percent.

To date, "Ma Bell" is keeping mumabout commercial developmentpossibilities -perhaps waiting for offersfrom the giant auto-makers.The lithium batteries with which I am

familiar are great from a weight andvolume standpoint and have great shelflife but are not rechargeable. They alsocan be a little unsafe. This one sounds

like a real winner. Hope they can putthem in small packages. Sounds like apack of two cells of the same weight asour present cells will last twice as long ona charge as a four cell nicad pack.

Dear Sir,I'm thinking about purchasing an Ace

3 channel radio system. I am planning toconvert it to 7 channels later, if i get it. Idon't know a lot about radios but when

the advertisement says that thetransmitter's battery pack is a dry pack.I think that this means that the batterypack takes alkaline batteries, I wouldlike to use nickel cadmium batteries. Is

there a manufacturer that makes a

nickel cadmium battery pack that willwork in the Ace radio. What I would like

to do is replace the alkaline batteries inthe original battery pack with G.E. nickelcadmium batteries. Since the G.E.

batteries are 1.2 volts and the alkaline

are 1.5 volts will this drop in voltagecause any problems? What would youdo, I am lost. Thank you for your timeand help.

Yours truly,Lanzy Baker

Springfield, HI.Ace has a mod kit for their transmitters

that includes the batteries and I believe

the charger at a very reasonable price.Surprised you haven't seen itadvertised. By the way. that is the only

to page 122

62

BIG it Beautiful

BY DICK PHILLIPS!

I have been a little concernedlately at some of the kitscoming on the market, and

even some of the ones which have been

around for a while. My concern is that weare using some of these models in a waythey were never intended to be used.That is, we are putting 2 HP gas enginesin place of smaller glow engines.One of the problems with doing this Is

that we are applying significantly morepower than these models were designedfor, adding much more weight In thenose than was intended by the designer,and producing lower vibrationfrequencies than would be the case withglow engines. The mass moving Isgreater In the larger displacementengines and the load on the alrframe,wing mounts and control surfaces Ismuch greater than was originallyintended.

All of these items added to the 'model'

designed alrframe can produce apotentially dangerous combinationwhich could fail at just exactly the wrongtime (Murphy's Law!) and create aproblem for us,When I first built Sid Morgan's J-3

Cub, I selected woods other than thosespecified In order to get around some ofthe problems I could see In the use of theQuadra engine. This made for a muchstronger model that would have beenthe case had I used the balsa specified.As with any building project, especiallyIn a new area, I learned a good deal fromthat model and It Is still teaching methings. It has had a lot of flights on Itsince It was built in 1976 and it Ispresently In such a shaky condition that Ihave recently decided not to fly It anymore as being just too darn chancy.This Is not to suggest that the plan is at

fault. It was originally designed for a .60or a .80 and I have seen a number of

them fly and they fly as the full scaleprototype did. It's not a pattern airplaneand It won't fly like one. Adding the gasfired engine to It makes it a little morecapable than it could ever have beenwith glow power aboard, but It still Isn't aP-51 or anything like it!As I have mentioned before, building

strongly will add weight but, at the wingloadings of these big birds, the additionof a pound or so won't make any

fm.rA

The Squadron concept again. The shotwas taken at the STARS Fun Fly at O/ean,New York, looks as If the STARS have theirD Vlll's almost ready for the air.

STARS Bristol Scouts were present andawed the onlookers with their realistic

flight. Four were flown together and muchimpressed those who were unfamiliar withmodels. Unfinished Fokker D VIII in the

background.

Three of four Super Stearman (plan byGodfrey) present at STARS event. The onein the foreground is Don's and Is patternedafter Joe Hughes' aircraft. Flies just great.

noticeable difference. The J-3 weighs 16pounds ready for the air and It couldeasily maintain its admittedly low-levelperformance at a weight 8 to 10 poundsheavier, surprising as that may sound.So, for the next few minutes, let's take

a look at building big models with an eyetoward building a solid, safe and longlasting model which can be flown with nosafety reservations.Even In the more temperate parts of

the country, we are pretty well at theheight of the building season as youread this with Christmas not too far off.For that reason, I'd like to do a little

review of building techniques for thebenefit of those going Into the largermodel for the first time.

Basic materials are first on the list and

these can be so varied depending onlocal conditions and availability. Thoseof you who have been following "Big IsBeautiful" for any length of time knowthat I have recommended the so-called

soft woods for some time now. By softwoods, 1 mean easily worked woods likespruce, white pine, cedar and poplar, toname just a few. Take a look aroundyour area and determine what woodsare readily available to you. Use as yourcritera woods which are straight grainedwithout knots or severe deformation of

the grain. The closer the grain, theharder the wood, generally speaking.Once the wood has been chosen,

then it is simply a matter of deciding whatsizes are required and how to go aboutcutting them. Generally, I use the samesize as recommended on the plan. Thetransition from balsa to one of the soft

woods Is enough to provide more thanadequate strength for the engines wewill be using in Quarter Scale and largermodels.

Working from a plan, such as theMorgan J-3, I changed all of the stripwood to western white spruce, which Ibuy at the local lumberyard. Naturally, Ichoose the straight grained pieceswhich are clear of any knots or checks. Iuse spruce because It Is readilyavallableto me here and there Is enougharound that I don't have too manyproblems finding good stuff.

If you are going to paw through a slingof 2 X 4's to find good wood, make sureyou pile it all back neatly again, you maywant some more at some time In the

future and you won't be very welcome Ifyou destroy the lumber yard's stock onhandl

Another good source of really finewood is the homebullt supplier. If youread through Sport Aviation (EAAMagazine) you'll find suppliers listedthere. They stock SItka Spruce for thehomebullder and It is just the best youcan get. My last batch of 50 lineal feet ofSItka Spruce 1 x 6 cost me about $30.00That's a bit over a dollar a board foot. If

you figure your balsa stick stock out atto page 92

63

Another Pitts kit! Seems like just about everyone has aPitts, but Royal Products has a one and two holer.No, not an outdoor "thing," but a Pitts 8-2! The extra

5" or so in the fuselage length for the extra cockpit makes adifference in the performance, for a model, that is!Construction:

The plans are quite good and I could find no fault with thebalsa and plywood selection. One feature noteworthy was thedie-cutting — crisp, sharp and accurate. A joy compared toother brands.

I elected to start with the fuselage. Who wants two wings onthe work bench? The fuselage construction is straightforwardmodel building, going together quite fast with the use of HotStuff. The basic frame-up of the plywood formers and balsastringers took less than an evening following themanufacturer's instructions. All of the sheeting, blocks andmiscellaneous parts fit with little or no modifications. The cowland engine mount assembly is practical and easy with thepre-shaped and cut balsa blocks.The horizontal stab and vertical fin are a piece of cake. Glue

them up, a little sanding and install. I used a C & B tail wheelassembly in place of that which was supplied (most of thehardware is in the kit). It looks a little more realistic with thesprings, etc., on the tail wheel assembly.

Step back and look it over — nice! The heavy dural gear willhelp those not-so-soft landings. Don't tell anyone that the 5/32wire, which is a part of the gear, takes most of the load.

I was quite impressed with the foam wheel pants but onlyafter working with them. They sand and finish like balsa with anadded plus of being lighter overali. Kraft wheeis were installedin the pants as I did not want to bottom out on landings. The

SPECIFICATIONS

Name PIHS S-2

Aircraft Type Sport ScaleManufactured By Royal Products Corp.

790 West Tennessee Ave.

Denver, Colorado 80223Mfg. Suggested Retail Price S89.95Available From Both Mfg. & Retail OutletsWing Span *. 52 InchesWing Chord 8¥4 InchesTotal Wing Area 830 Square InchesFuselage Length 46-9/16 InchesStabilizer Span 20 InchesTotal Stab Area 190 Square InchesMfg. Rec. Engine Range 60-.80Recommended Fuel Tank Size Not specifiedRecommended No. of Channels 4

Recommended Control Functions Bud., Elev., Throt., All.Basic Materials Used In Construction:

Fuselage Balsa & PlyWing Balsa & PlyTail Surfaces Balsa

Building Instructions on Plan Sheets YesInstruction Manual :...Yes

Construction Photos No

RCM PROTOTYPE

Radio Used Kraft

Engine Make & Disp Kraft 61Tank Size Used 12 Oz.Weight, Ready To Fly 128 OuncesWing Loading 22V4 Oz./Sq. Ft.

SUMMARY

WE LIKED THE:

Clean dle-cuttlng; sturdy landing gear; good parts fit; good flightperformance.

WE DIDN'T LIKE THE:No fault noted, but it Is not a beginner's project.

cabane struts are easy to install and key into the fuselage,assuring proper alignment. Two bolts hold the upper wing onthe assembly.On to the wings. I was amazed at how quick they went

together. All the parts fit and I enjoyed building them. Not anexcessive amount of work considering two sets of wings. Theyseemed quite strong and with the addition of the "N" struts,which are functional, made the overall wing/fuselage structureseem unbreakable.

Mating of the wings to the fuselage was a snap. I used aRobart incidence meter to double check all of the incidence

angles and thrust line. No major changes were necessary. Beassured that things are right with this tool, something everyoneshould have around the shop.Check all of the controls at this point. Make sure all of the

surfaces move free with no binding. Du-Bro bolt on ball linkswere used on the aileron inter-connects rather than the systemshown on the plans. No special reason, just wanted to dosomething a little different. The elevator pushrod length mustbe determined and installed permanently at the horn, prior tocovering. The rudder pushrod can be snaked through after theairplane is finished.Covering:The framework got a few coats of sanding sealer, followed

to page 90

64

KING RAT AND HIS PIETENPOLFIGHTER BOMBER

With three cat victories already to his credit. King Rat will soon become an ace. Flying the most sophisticated and heavily armedaircraft known to mouse and man. King Rat seeks out and delivers devastation to his enemies. A House of Balsa Pietenpol hasbeen specially modified for his death dealing purpose. The roar of the powerful O.S. Max .35 engine strikes fear in the feline

population as they scurry for cover but there is little they can do to evade this flying machine which is controlled by a 5 channel Avionicsguidance package by Kraft Systems.As for the House of Balsa Pietenpol modifications, I discarded the solid balsa tailfeathers in favor of the built-up rib structure as on the

full scale ship. The wing tips were flared out similar to the WW I Fokker aircraft. A head rest fairing was added but the front cockpit wassheeted over. The wire rigging, turnbuckles (Proctor), and hardware fittings were researched through two tech manuals concerning thePietenpol. These were bought at the EAA museum in Hales Corner, Wisconsin. The Gnome dummy cylinders and Sp)andau machine areWilliams Brothers products. The feed/eject scoops are scrap built as is the working bomb.The pilot, "King Rat," started out as a Williams Brothers pilot. It was filed (the face) flat as possible. Scrap balsa used to build up the

rodent's features. More scrap balsa was added to the bottom of the pilot for proper height. The head was also cut and rejoined to get awayfrom the static "mummy" pose. The head is covered with mole fur.The whole plane is covered with antique Coverite except for the front walnut veneered areas. Sig dope was used for sealing and

colored areas, insignias, etc. The side and top cowling was made from very thin aluminum sheet, attached with epoxyand RC 56 glue.And now, dear reader, if your pet cat suddenly goes bananas for no apparent reason, it might be that its super sensitive hearing has

picked up the sound of King Rat on patrol and all that you can do is to hope for the best. gy Brad Kaste

Pit stop. GENE HUSTING

The 1979 ROAR Nationals were sponsoredby the MORCAR Club of Columbus, Ohioand were held at the new Eastland

Shopping Mali parking iot.

1979 ROAR NATIONALS

The 1979 ROAR Nationals washeld in Columbus, Ohio, andwas sponsored by the

MORCAR Club of Columbus. TheEastland Mall Shopping Center parkinglot was an ideal location and providedmore than enough area for the track andcompetitors. The Nationals was a twoweek event with the first week devotedto 1/8 Scale and the next week to 1/12Scale. Having just spent two weeks inGeneva at the World's Championships,many of the 1/8 Expert Class racers hadused up their vacation time and couldnot participate in the Nationals, myselfincluded. So I'll not be able to give you afirst hand report on the 1/8 Nationals, butI did get to talk to many of the racers atthe ROAR banquet following the 1/8Nationals, and I'll give you theirconsensus on the races.

To begin with, they all praised therather inexperienced MORCAR club fordoing an excellent job in running the 11BNationals. The 1/8 program consisted ofGT Super Stock, Can Am and Ovalracing with three driver classes: Expert.Amateur and Novice classes. Due tolimited spaced availability here, we'llhave to limit our reporting to the Expertclasses. Amateur and Novice results willbe published in ROAR'S Rev-Upnewspaper for interested readers.

1/8 GT SUPER STOCKThe 1/8 track layout was described as

a "typical short Mid-West type track" bythe racers. There appeared to be about4 or 5 racers who had a good chance ofwinning, including Top Qualifier ArtCarbonell.

That super fast racer, Arturo Carbonell,was Top Qualifier in the 118 Super Stockand Oval events and won the Super Stockclass.

Gary Kyes was Top Qualifier and won the118 Can Am ciass and also won the 116 Ovalclass.

Rick Davis could only take time off work tocompete in one event, so he chose the 11126 cell Modified class and easily won it.

Jack Jacobs, Dana Smeltzer, and BillSteele were all running extremely fastand had a real tight race going, butArturo Carbonell put it all together for thewin with Hank Smith, 2nd, and Bill Steelewho led part of the race taking 3rd.

1/8 GT SUPER STOCK1. Arturo Carbonell Delta

2. Hank Smith Delta

3. Bill Steele Assoc.

4. Rod Galloway Delta

5. Ken Campbell Delta6. Jack Jacobs Assoc.

7. Mike Dueller Delta8. Bob Yelle Delta

9. Bruce Oakley Delta10. Don Shrieve

1/8 CAN AM

This is the premier event of the 1/8program and a few surprises surfacedhere. Along with the guys who went fastin the GT event, Mark Majors lookedsuper good, but the one who hadeveryone talking during qualifying wasGary Kyes. Gary didn't run the GT event,and with a limited amount of practicewas Top Qualifier. Arturo Carbonell,Jack Jacobs, and Gary Kyes made areal race of it, but at the finish it was GaryKyes winning. Hank Smith finished 2ndagain, with John Thorp taking 3rd.

1/8 CAN AM1.Gary Kyes MRP2. Hank Smith Delta

3. John Thorp Thorp4. Bill Steele Assoc.

flSSOcinTco

Curtis Husting won the most competitiveciass, the 1112 6 cell Production, where thetop 5 finishers were all on the same lap.

17 year old Mike Lavacot is already a superdriver. Mike was Top Qualifier In the 1112 6cell Modified class and won the 1112 6 cellStock class.

66

5. Jack Mueller Delta6. Mark Major Assoc.7. Jack Jacobs Assoc.8. Bill Klingbell9. Dana Smeltzer Assoc.

10. Arturo Carbonell Delta

1/8 OVAL

Arturo Carbonell was Top Qualifier,yet Gary Kyes added another win in theOval race, but not until a tough race wasrun between Gary and Art Carbonellwho had to make a long pit stop droppinghim too far back.

1/8 OVAL1.Gary Kyes MRP2. Don Shrieve

3. Art Caibonell Delta4. Bill Clemens Delta

5. Ken Campbell Delta6. Paulo Catucci SG7. Mike Queller Delta8. Dana Smeltzer Assoc.

9. Hank Smith Delt^10. Jack Mueller Delta

1/12 ROAR NATIONALSThe 6 cell outdoor events were run

first, on the 1/8 track with a shortenedstraightaway. When we first saw thetrack, it did seem to be a "typical short[\/lid-West 1 /8 track," especially since wehad just come back from the 1,000 footlong Geneva track. Although all the 1/8racers liked the track, we thought it alsomade an excellent 1/12 track. Sundaywas open practice, with the weather at90° with 90% humidity and it remainedthat way all week. We got familiar withthe course and dialed in the cars with thecorrect gearing, wings, etc. The practicesessions were 9 minutes long, so battery

Don McKay made his prediction come trueby winning the 1112 Gas class. Don will beable to retire undefeated because the 1112Gas class is being discontinued at theNationals.

r 1 _ -f

This is the 1112 indoor track. That's right -It was run ouWoors. The track sure lookedsmall outdoors, but It was a great indoortrack.

Kent Clausen was one of the best of theExperts by being Top Qualifier in both the1112 6 cell Production and Stock classesand winning the 1112 4 cell Stock class.

Curtis Husting's TOJ bodied Sports Carwas typical of the Associated team cars.Traction was good enough that wingsweren't required.

11

Curtis' Associated RC12E Production carfeatured the lightweight conversion partsand the new super fast Bantam Midgetservos from Novae Electronics.

Gary Kyes entered this beautiful 1112 917Porsche and won Concours. 118 Concourswas won by Paul Punter.

life could be checked, with all thequalifying heats and Mains 8 minuteslong.

1/12 6 CELL MODIFIED CLASSThis is the 6 cell (battery) outdoor

class using Can Am bodies and Modifiedmotors — re-wound, ball bearings, etc.17 year old Mike Lavacot, from So. Calif,was Top Qualifier turning 32 laps withhis Reedy modified motor. The next fivequalifiers turned 31 laps, showing justhow close electric R/C racing is.Gary Kyes got the jump at the start

with Kent Clausen right behind. Kenttwice came up to pass Gary, but bothtimes Kent tried passing on the outsideand Gary spun him out. Meanwhile, RickDavis, who got off to a bad start, workedhis way up to Gary, followed him for acouple of laps, picked the right spot andpassed Gary taking the lead. Kent hadworked his way back up to Gary again,tried to pass a third time, but didn't makeit again. Davis went on to win with Kyes2nd, and Clausen 3rd. Top QualifierMike Lavacot, had broken the spring inhis transmitter which made it impossibleto drive.

1/12 6 CELL MODIFIED1. Rick Davis Assoc.2. Gary Kyes MRP3. Kent Clausen Assoc.4. Jeff Rold Assoc.5. Curtis Husting Assoc.6. Gene Husting Assoc.7. Roger Curtis Assoc.8. Mike Lavacot Assoc.9. Mike Rowland Assoc.10. Kevin Orton Leisure

1/12 6 CELL PRODUCTIONThis is the 6 cell outdoor class with

Can Am bodies. Chassis are all stock kitmanufactured cars, such as sold in"Ready To Run" cars with completelystock ROAR legal motors. Nomodification allowed to cars or motors.Now comes the incredibly strange

part. 20 year old Kent Clausen fromMonterey, Calif., was Top Qualifierturning 32 laps. Using a stock kit car witha stock motor, Kent turned the samelaps as the modified cars with modifiedmotors did the day before! Not only Kent,but the whole field turned the same lapswith the kit cars, including myself. Aftermuch discussion, we all agreed thestock motors were slower on thestraightaway, but much easier to drive Inthe corners. Even so, none of usexpected this outcome. Jeff Rold, CurtisHusting, and I turned 31 laps.

In the Main Event, Curtis Husting justsimply ran away with the race — Curtisgot out in the lead and was long gone.Top Qualifier, Kent Clausen got a badstart, but worked his way up to that man,Gary Kyes, again, but when Kent tried topass Gary he got knocked upside downand dropped to 4th Place. Curtis went onto win with Kyes 2nd and that smooth,fast driver, Eric Hahn, 3rd.1/12 CELL PRODUCTION CLASS1. Curtis Husting Assoc.2. Gary Kyes Leisure3. Eric Hahn Jerobee4. Kent Clausen Assoc.5. Gene Husting Assoc.6. Mike Rowiand Assoc.

to page 87

67

HERE'S HOW

A fleet in a tree -forty feet up -and how to rescue it? That is, in onepiece.

A rope thrown over a limb and looped around the tail enabled thebig bird to be lowered gently down through the branches.

It happened one Saturdayafternoon. Al Rockhill broughthis scratch-built, Quadra

powered, Fleet bipe to the flying field forsome test flights. All of the boys on theflight line stopped flying and settleddown in a good spot to watch as Albegan to assemble the big bird. When allwas in readiness, and the Quadra wasidling smoothly, Al slowly advanced thethrottle and soon the big Fleet was offinto the blue. What a beautiful sight! Theclimb-out was near perfect and then, atapproximately 100' altitude, it went into agentle left bank. Suddenly Al realizedthat the gentle left turn was there to stay.Trying all the controls, he discovered hehad only the throttle. By this time theFleet had made several large circles andthe wind had carried it well over thewoods located on the southeasternportion of our flying field. At that time ofyear the woods was an absoluteimpenetrable jungle of nettles, vines,poison ivy, and undergrowth. We stoodtransfixed and watched the Fleet circleout of sight over the woods and waitedfor the inevitable --- that is, theimpending crash with parts droppingthrough the tree limbs. There wasabsolute silence. No sound of crashing

parts failing through the tree limbs—justa complete nothing. What hadhappened to the Fleet?A good friend (and field owner) Cliff

Bennett came to our rescue by drivinghis Ford tractor with rotary mower, wellinto the woods, carving a path for us. Itwasn't long before the Fleet was spotted— in the top of a tree, 40' up and hangingby its tail from a limb (Photo No. 1). Aftertalking over many possible ways ofretrieving the Fleet, without causing herto fall, we decided to climb the tree,(which was loaded with poison ivy) loopa rope over the tail section, throw therope over a limb, jar the airplane loose,and lower it gently to the ground (PhotoNo. 2). During the process of loweringthe Fleet, it was necessary to pry it awayfrom the limbs in order to lower it withoutdamage. As it neared the ground,several pairs of hands reached up andretrieved it (Photo No. 3).

Later, with the Fleet setting safely onthe flight line we assessed the damagecaused by the crash (Photo No. 4).Would you believe only one brokeninterplane strut? Twenty-four pounds ofairplane in a tree and that was all. Thankthe Lord for the limb that caught it by thetail — because that's what saved it!

What an exciting Saturday afternoon!Especially for Al, who must have died athousand deaths. As for me? I shot therescue sequence photos and tried tostay away from the poison ivy!Once in a while 1 get a chance to do

some building. That is, when Dick KIdddoesn't know when I have a set of hisplans completed. And, recently, I havebeen doing some covering with CoveritePermagloss. Not a new product but onecertainly worth mentioning. This is greatstuff! Especially for the large aircraft thatare popular today. I found it very easy towork with, once the correct temperatureof 375°F was set on the heating iron.

Coverite puts but an excellentinstruction booklet to help you along theroad to a successful covering job. One ofthe things mentioned under"Preparation of wood surfaces" wasventilating the wood to dry it out. This isdone by inserting pins in a block of wood(5/8/sq. in.) and gently puncturing thesurface of the solid sheeted areas withthis tool. The purpose of this is to get ridof the moisture and dry out the balsa.Place the framework under a heat lampor out in the direct sun for about 3 hours.Then apply a coat of Balsarite (Coverite)

to page 86

dEager hands assist in the final moment of triumph! It was finallyrescued. All 24 pounds of It.

Al Rockhllls' magnificent scratch-built Fleet. Quadra powered, 24pounds, covered with Coverite Permagloss. Doesn't It look real?

SMITH I

STEERABLE TAIL WHEEL

UDCATE 360° LOOP BENDIN WIRE SOTHATTAILWHEEL

ARM AND RUDDER ARE "NEUTRAL .

1 tlESS THROWImORE THROW _(t

PLY

BULKHEAD RUDDER

TOP VIEW

NOTE X DIMENSION

BULKHEAD

OUTER TUBING

LOCATE LOOP PROPER DISTANCE FROM

OF TAILWHEELSO THAT RUDDER ANDTAIL WHEEL THROW ARE APPROX.THESAME.

SMALL I.D. FUEL LINESLIPPED OVER TAILWHEELARM.

INNER NYROD

OR PUSH ROD

360°BEND

IN WIRE

2-56

THREADED ATBOTH ENDS

PLY BULKHEAD

RUDDERCLEVISEPOXY OR

GLUE

PLY

CLOSURE WHEEL COLLAR ( SET SCREWAND SOLDER)

HARDWOOD BEARINGBLOCK SLOTTED TO FIT

WIRE.PREFORMTAIL

WHEEL STRUT BEFOREASSEMBUNG PLY CLOSURETO BEARING.

Thanks To —

Don GrossiBedford, Moss.

GET YOUR PANfSTitles are intended to capture

your attention. If this one did,why not read a couple of

paragraphs? This project is easier than itlooks, allows for creativity, and isenjoyable. While making your pants, youcan continue to fly your "bottomless"bird, so there is no pressure to be in ahurry.A statement-question that I hear

frequently is, "I like your plane, wheredid you get the wheel pants?" It seemsthere is a considerable market for pants.And why not? Wheel pants on modelsize aircraft may or may not do much foraerodynamics but they make the planelook prettier and meaner. You canindividualize your bird, even though itwas built stock from a kit by addingwheel pants of your own design.

If you are still with me, I better explain"where I am coming from." I am not anexpert in any part of the RC hobby,merely an enthusiastic participant. Ihave been in the hobby long enough toknow some of the basics and to realizethe wide range of skills and techniquesemployed. We are adding RC hobbyistseach day and, as a result, we keep"re-inventing the wheel" on an individualbasis. After working out the details formaking fiberglass wheel pants, Idiscovered that even though all of my"original ideas" had been done before, alot of RC'ers had never heard of thebasic techniques. Ideas and methodsthat really work are worth repeating, sofor all modelers who haven't tried thismethod, this workshop is in session.The basic process entails using a

male mold which is somewhat easier toconstruct than a female mold. Thefiberglass parts are built up on theoutside of the mold rather than the morecommon method of lay-up inside a mold.The key to obtaining a satisfactoryexternal surface on the finished productis the use of a common toy balloon toforce the resin and cloth to conform tothe contour of the mold. This processcan be used to form many items thathave a simple basic convex shape.Engine cowls, wing tips, tip tanks, andbombs are some items that are readilymade in this manner. We will make amale mold and use it to form fiberglasswheel pants. The pants shown are foruse with sheet metal struts. Pants forwire gear can be made in a similarfashion but will require specializedmounting hardware (such as the flangedwheel collars made by Fox) and will notbe covered here. If you haven't workedwith resin before, please be very careful

By Dawes H. Reyburn

with the catalyst and always providegood ventilation for the work area. Seeyour hobby dealer about the hazardsinvolved.

TYPICAL WHEEL PANTS

You will need; resin, fiberglass cloth,party balloons (about 8" diameter),plastic food wrap, scrap softwood, andassorted hardware as noted in text (seePhoto #1).

The necessity of making molds seemsto stop a lot of people from makingfiberglass parts, so we will make onemold which, in effect, becomes fourmolds. Keep in mind that this mold is nota throwaway item. It can be used overand over to makeduplicate parts or canbe reshaped if a smaller product isacceptable.

Determine the size wheel that youwish to cover since the pants must bebigger than the wheels. Find two piecesof scrap white pine (or any otherworkable softwood) that, when placedback to back, will be at least as thick,high, and long as the desired interiorsize of one complete wheel pant(?).Sketch a profile side view of the desiredshape right on one piece of board. Use aright or ieft view, it doesn't matter (seePhoto #2). Remember to allow sufficientangles on the bottom of the pants tokeep them above the runway when taildragging or nosing over. If you fly from agrass strip, keep the pants fairly high atthe bottom.

Next determine wheel position withinthe outline, clamp the boards togetherand drill a 3/16" hole through bothpieces of wood right where the wheelaxle will be. (The hole should be drilledas near a 90° angle as possible as it willbe used to bolt the boards together andlater it will mark the wheel pants for axlelocation.) Cut two pins from nails or wire(see Photo #2) and press the boardstogether against the pins and bolt themthrough the hole. The bolt and the pinswill hold the boards in alignment for thenext steps. (Do not use glue since youwill separate the boards later and havetwo molds.) You may remove the bolt forsome - teps as the pins will hold for allbut very rough handling. Saw throughboth boards to achieve a rough shape ofthe profile sketch (see Photo #3).Now you are well along, so use your

disk Sander, grinding wheel, knife, rasp,or what you have, to achieve a pleasingfunctional shape for the pants. Just cutaway everything that doesn't look likewheel pants. Shape both sides a little ata time to keep the two halvessymmetrical. Use templates foraccuracy if you desire. Always work inreference to the joint between theboards and maintain the joint as thecenteriine (see Photo #4). If your lumberis soft, shaping the mold is easy andpleasant so develop a shape thatpleases you. You are thedesigner/sculptor and you can make alot of duplicate pants with the mold. Tip:If you haven't tried "Dragon Skin" for fast

70

2.) Pant outline and position of pins1.) Materials needed. See text

4.) Rough contour of mold.3.) Cut to rough shape of outline

6.) Mold halves separated5.) Sanded smooth, ready to separate.

7.) Holding blocks attached. Note shape. 8.) Plug cut and removed.

71

rough shaping of any softwood, run toyour neighborhood hardware store andbuy a sheet ortwo. It is a metal substitutefor sandpaper. While It won't replacepower equipment, It is cheaper and it willeat balsa like you won't believe.When you have the shape and size

about right, sand the mold to a smoothsurface (see Photo #5). Note: Thathighly visible line between the boards isblack art paper that was placed there forphotographic emphasis of the joint.Remove the bolt and separate the two

halves. You should now have twoidentical but opposite molds (see Photo#6). Since the two molds were shapedto a common centerline, the pant halveswill fit together perfectiy. Firmly attach apiece of scrap lumber to the back of eachmold. This provides a surface forclamping the mold in place while youwork. The use of wood screws isrecommended, to aliow easy removai incase you wish to reshape the mold at alater date (see Photo #7).To use the same molds to make both

right and ieft pants, we must make somemodifications to ailow for mounting atthe strut. Center your strut over the axlehole and mark a rectangle (or follow strutshape) about 1/8" to 1/4" larger than thegear strut end. The excess size wiil allowfor some later adjustments, if necessary.Use a razor saw to cut about 1/8" deepon this outline. After saw cuts are made,use an X-Acto knife to undercut. Try tokeep the undercut parallel to thecenterline (back) surface of the mold.This will determine the mountingaccuracy. Gently remove the cut-outplug, in one piece if possible (see Photo#8). Do not destroy the plug. Repeat theoperation on the opposite moid. (If youfollowed the gear shape, instead of arectangle, be sure to cut for a left andright pant.) You will remove or replacethese plugs to make left and right pants,Clamp the mold in a vise or nail to a

box or workbench. Place scrap paperunderneath to catch any excess resin.Remove the plug and save it for later.Now cut a balsa wood plug and sand itto shape. Make this plug about 1/8"shorter and 1/16" narrower and thinnerthan the original to allow for thethickness of the resin and cloth. Wrapthis plug with one or two thicknesses ofthin plastic food wrap (Saran Wrap is acommon brand name). Place the plugwhere you can find it. To keep the resinfrom sticking to the mold, drape twothicknesses of plastic food wrap over themold and work it down, especially intothe area where the plug was removed.(Note: A few wrinkeis are inevitable andwill cause no problems.) Dimple theplastic at the bolt hole to cause a locatormark on the pant. Do not pierce theplastic!

Cut fiberglass cloth into sizes andshapes that will cover the mold withabout 1/2" or more overhang ail around.Plan about four thicknesses if you use3/4 ounce cloth, less if heavier cloth isused. I use one layer of heavy clothoverlayed with one layer of 3/4 ouncecloth.

Now a short discussion of the firstpotential problems. Wheel pants aremuch longer than they are high. Whenwe put the balloon over the resin andcloth, the contracting balloon will try towrinkle the cloth parallel to the longestdimension. To minimize this, placemasking tape on the long sides of thecloth overhang, stretch the cloth snugand fasten to the back of the mold withthumb tacks. (Depending on which sideyou are making, use the baisa piug toassure enough slack is in the cioth toailow the plug to be inserted after resin isapplied, see Photo #9.)

If everything has gone all right this far,mix the resin (about 1V2 oz.) using aboutone-fourth again as much cataiyst asrecommended. Thoroughiy saturate thecioth with resin. Work out ali visibie airbubbies. (I use a smail piece of packingfoam folded over and clamped in aclothespin (see Photo #1). Put theplastic wrapped balsa plug in place andyou are ready for the balloon. Blow theballoon up once and let the air out topre-stretch it. Blow up again and nowforce the balloon over the mold whileslowly letting the air escape as theballoon settles in piace (see Photo # 10).(You probabiy should practice this on abare plug to get the hang of it beforeapplying resin and glass.) You will havetwo thicknesses of balloon to form theresin and glass to the shape of the mold(see Photo #11). Lay finished part asidefor a minimum of 24 hours as the resinhardens very slowly under the balloon.Now make the other half of your pant,

this time leaving the original plug inplace under the plastic wrap to form acontoured outside half. Lay aside toharden.

Be sure to change the molds that usethe plugs when making the second pant.Remember, you want left and rightpants.When resin is hard, peel the balloon

away. Trim the overhanging fiberglassflush with the back of the mold (seePhoto #12). Sand the edge, ifnecessary, to achieve a straightcenterline. fRemove the pant half fromthe mold and remove the Saran Wrapfrom the inside (see Photo #13) of thepant. At this point if you decide the pantis not thick enough, don't panic. Simplyrewrap the moid with new plastic wrap,replace the pant half and add more cloth,resin, and a new balloon. Allow time toharden.

When you have two halves that youare satisfied with, cut the wheel openingin the bottom of the halves. Maybe makethe opening a little smaller than you willactually need. Wash the halves withalcohoi, especiaiiy around the seamarea, and allow to dry.We know the halves are the same size

but they are flexible and keep bendingaround, so place the halves togetherand align one spot that you know iscorrect, then Hot Stuff that spot. Makefour or five more Hot Stuff points aroundthe seam as you align the joint. Use5-minute epoxy to seai the seam ali theway around inside the pant.Now reinforce the seam in front of and

just behind the wheei opening. Theseare the weakest areas. This can bemessy, so cut a 1" square of piastic film(backing from MonoKote or Solarfilm isfine). Piace a 1/2" square of giass clothon the plastic and smear on someepoxy, Place the whole mess inside thepant and position it with the one fingerthat you can get through the wheeiopening, squeeze in place and leaveplastic, cloth, and all in place until theepoxy hardens, then remove the plastic.Smear extra epoxy around inside ofwheel opening and around the offsetsfor the gear strut as extra reinforcing.Aliow to harden. Finish cut the wheelopening and driil the axle hole.

Test your method of mounting. Since Ido not use pants on high performancebirds, I have had good luck withoutattaching the pants at the outside end ofthe axle. I clamp the pants to the sheetmetal gear struts with the axle nuts.Usually I use threaded nails for axles(see For What It's Worth, Oct. '78, ROM)and the nail head guarantees that thewheel won't fall off the axle, so if the axlenuts are tight, no problem. If you desireto try this type of axle, that big old nailhead allows for many types ofattachments at the outside end of theaxle. Soldered metal tabs, bolts,silicone, or key slots, are some areas toconsider. It all depends on the size andshape of your wheei pants.

Check the outside surface. Sand thehigh spots, if necessary, and fiii anyporous areas and low spots with resinand micro-balioons. When cured, sandto your satisfaction and the pant is readyto paint.The foregoing sounds complicated

but it isn't once you have tried it. Youmay spend an hour or so on the mold butthe rest is fast and easy. Waiting for theresin to harden is about the hardest part.Now that you have made wheel pants,

making a cowl or wing tips won't be anyproblem at ali. Fiberglass parts aremuch more durable than most moldedparts as furnished in kits.

Fly neat, keep your pants on! □

72

10.) Pressing balloon over mold9.) Glass In place ready for resin

12.) Trim and sand flush with mold.11.) Balloon m place.

13.) Remove plastic wrap from Inside. 14.) Molds, halves, and a finished product.

15.) Two views of pants. 16.) They don't look bad.

73

/for WHAT IT'S WORTH\The following Idea was submitted by

Richard R. Smith of Waynesbore,Virginia. It Is an idea that Richard hasbeen putting into use for some time andhas found It most useful not only for It'soriginal intention but for other uses aswell.

During construction many people plugor wrap those brass fuel tank lines toprevent them from becoming dirty orclogged with dust, wood chips, paint,etc. An easy way to do this at any time isto cut off a piece of silicon fuel tubing andapply a little silicon adhesive to one endand let dry/cure, After this Is done youhave a neat slip on cap that can be usedover and over. Making up a number ofsuch caps will assure a ready supply atall times.

Generally, lengths of 3/4" to 1" areadequate. The silicon adhesive may beany brand such as found in stores (GE orDow). A sketch of this idea is shown.

SILICONEADHESVE

In an attempt to store dowel, wire, &tubing in an orderly yet handy container,William Bitautas of Chicago, Illinois,collected several paper tubes andassembled them as shown in the sketch.The large center tube was about 4" Indiameter and was cut In half. The back ofthis tube was covered with stiffcardboard as were the bottoms of all thetubes. Short lengths of tubing, wire, &dowel (about 3"-6") are stored in theshortest tube and longer pieces are put

in the longer tubes. The center section Isuseful for storing heavier pieces ofhardwood and straightedge. This holderfits handily on the side of Bill's workbench.

Fred T. Strauss of WashingtonTownship, New Jersey, made up asimple third hand which any modelercan always use. Take a scrap of woodabout 4" square and a piece of 1/8"solder. Form a loop on one end andsecure to block with a screw and

washer, as shown In sketch. Slide analligator clip on the other end, touch itwith a soldering iron to secure andyou're all set. Two or more arms can beplaced on the same block If needed. (Ed.Note: for heavier objects, silver solderwire might work better due to its greaterstiffness.)

Plastic pilot figures that have brokenloose Inside of a sealed canopy areunsightly and troublesome to repair. Toprevent this from happening, try thefollowing method submitted by RalphAkens of Warren, Michigan, during theconstruction of your next project.

Prior to painting the plastic pilot figure,insert a 6" loop of soft .05 wire into itshollow base. Reach inside the hollow

base with long-nose pliers and bend andtwist the wire until It is completely hungup on the interior cavity of the pilot figure.Support the pilot figure in clay, with itshollow base upright and fill the cavitywith a small amount (about 1/8 oz.) ofSIg Expandable Polyurethane liquidfoam. (See accompanying sketch.)

PLASTICPILOT

PIQURE

POLYURETHANEFOAMCOCKPIT FLOOR

WITH HOLE

FOR WIRE

EPOXY

IN PLACE

05 SOFT WIREINSERTED INTO PILOT

AND BENT OVER

UNDER COCKPIT FLOOR

When the foam has hardened, thewire is securely bonded Into the pilotfigure. Prior to Installation, this wireprovides a convenient handle to hold thepilot figure during detail painting. Afterpainting, the pilot is permanentlyattached to the plane by pulling the wirethrough a small hole in the cockpit floor,bending the wire over and epoxying it inplace.

o

vA clever idea by Ron McDanlels of

Terre Haute, Indiana, as the sketchshows, Is to take a wine bottle stopperand drill out to fit over some of your smallscrewdriver handles. It makes themeasier to work with, but also can belocated on your work bench much faster.(Ed. note: The process to get anunneeded stopper Isn't all bad either.)

Sam F. DiNoto of Methuen,Massachusetts, sent along his methodof attching the wing to his "Skylark 56."Sam claims it has solved his problems oflosing nylon wing bolts, trying to getthem started into the threaded block etc.

First, enlarge what holes you may haveon your wing to allow the heads of thebolts to pass through. Use 1/16"

o

_/FOR WHAT IT'S WORTH VLATCHED

WtNG T/E

WOOD

SCREW

FUSELAGE

UNUTCHED

. NYLONLATCH yj/ifgQBOLTS

aluminum and cut a latch as shown inthe sketch. Sam uses a wood screw forthe pivot in the center of the latch andalso cement on the threads of the screw.It's a pleasure to loosen the nylonscrews about two turns, rotate the latchand remove the wing. A few words ofcaution: Be sure and tighten the screwsbefore flying.

To achieve the proper amount ofdownthrust on your engine mount —being individual mounts or round base— the following suggestion was sent In

.ENGINEMOUNT

— 3/8- DOWELJ

FILE

ENDROUND

#45 DRILL1/2" DEEP

by Charles L. DeCap of East Moline,Illinois. Per the sketch, first mark theangle of downthrust on a block of woodand wax lower portion. Next clampengine mount to reference line andfollow up with wax paper or Saran Wraptaped to flat surface. Apply epoxy puttyto mount and place on wax paper orSaran Wrap to harden. After putty hasset up, trim off excess epoxy and drill outmounting holes. Details are shown insketch.

Bob Zimmerman of Neola, Iowa,found an inexpensive, simple way tofabricate a "long reach" screwdriver forhard to get at places. Simply flatten oneend of a length of brass tubing andepoxy the other end into a drilled outhandle. Brass tubing comes in variouslengths to suit your needs. Also, it comesin various diameters to suit different size

screws. See sketch.

□

©

o

M-WOOD/ BLOCK

■Si

1 - ■X-\\■nl! {|i ]

DOWNTHRUST

When removing the wings fromseveral of his R/G model planes, DennyDeLaroche of Cape Coral, Florida, findsthe rubber bands covered with oil andvery slippery. Upon taking them off,occasionally the edge of the bands arecut by fingernails or they slip and fly offinto space. To alleviate this problemDenny designed this little gadget, asshown in the sketch, to remove therubber bands. It sure works 100%.

Some clean words from NelsonChong of Los Angeles, California, whohas found that a product called "WetOnes" (a moist soft cloth towlette),works very well for cleaning your handsand planes at the flying field. They onlycost about $1.30 for a bottle of 70 sheetsand are obtainable at most drug stores.They are much easier to carry than largerolls of paper towels and spray bottles ofcleaner in our already space-tight flightboxes.

Larry Latowski of Battle Creek,Michigan, tells you how to clean up youract. The best de-greaser and cleaningmaterial for paint and plastic films is soldat the local auto-body supply houses. Itis called Dupont's Prep-Sol. A lightwiping with this solution leaves a modelexceptionally grease-free. Especiallyuseful when patching the plastic films.Larry has never known it to harm asurface finish.

An inexpensive method of weightingdown a wing, fuselage, or most anythingfor that matter, during the buildingprocess, is to get some empty milk orwater, quart, half-gallon, and gallon sizeplastic containers. By pouring water in orout, you can vary the weight up to 2,474,or BVz pounds respectively. Be sure tocap and wipe dry the outside of thecontainer, to prevent water from gettingonto the wood surface. This idea wassubmitted by Roland Chow of MontereyPark, California.

An inexpensive small fuel pump,primer, oiler or glue gun can be madefrom disposable hypodermic syringesavailable in assorted sizes at most drugstores. They may be used as is, withoutneedle, or with apiece of fuel lineslippedover the end. This idea came fromWalter Farmer, Holbrook, Arizona. □

showcase *73All items appearing in Showcase 79 arepress releases supplied by themanufacturer of the product and/or theiradvertising agency unless otherwisespecified. Note: The review ordiscussion of any product by RadioControl fvlodeler Magazine does notconsitltute an endorsement of that

product nor any assurance as to itssafety or performance by RCM.

CHANGE OF ADDRESS NOTICEBob Violett Models a business

primarily oriented towards thedevelopment and production of R/C FanJet aircraft and accessories, hasrelocated in Orlando, Florida. Thetechnical nature of these productsdemands extensive flight testing beforerelease and this is best accomplished ona year round basis. Currently available isthe well proven Skyhawk, SkyhawkFans, various decal markings, retracts,a new "Power Plus" exhaust system.Flight testing of the F-86 F Sabre Jet andits systems is in progress and scheduledfor release in the spring. Bob invites yourcorrespondence to: Bob Violett Models,P.O. Box 822, Casselberry, Florida32707. (305) 677-5044.

MRC/WEBRA SPEED .61REAR EXHAUST ENGINE

The new .61 front rotor, rear exhaustpattern engine, Model No. 1030RC isdescribed as the most powerful engineof that size ever developed byMRC/Webra. It is reported to develop1.85 HP at 16,000 rpm. This newpowerplant utilized a Dykes ring, and amassive 17mm crankshaft, large bailbearings, and a thick crankcase. Ail ofwhich add up to many, many hours ofreliable operation, even under themechanical and thermal stresses of highperformance operation. It comesequipped with the new Dynamix slidevalve carburetor, which provides

excelient throttie control throughout theentire operating range with none of theusual mid-range sagging problems. Forthe ultimate combination, thecompanion 1100/20 tuned pipe isrecommended. For further information,see your dealer, or inquire from FrankRitota, at Model Rectifier Corp. (MRC),2500 Woodbridge Ave., Edison, NJ08817.

BALSA USA SOPWITH PUP

Another great one from that prolificgang out at Balsa USA — this one is anold favorite, the Sopwith Pup, inStand-Off Scale, for Quadra or similarpower plants. It spans 9 feet, with a 21"chord. The height is 34", and the totalflying weight is around 27 pounds. Thekit includes full sized rolled plans andcomplete instructions, with 3-views andphotos, Ali parts are die-cut from quaiitybalsa and plywood. A 190 piecehardware kit is included, which containseverything required including cable andbrass tunbuckles. A10Vz" diameter cowlis included, as are redwood spars,cabanes, struts, landing gear andlongeron. The "Pup" is priced at$119.95, direct only from Balsa USA,P.O. Box 164, Marinette, Wl 54143. It isalso offered complete with Quadraengine, at $199.59.

assembled at $27.95, and in kit form for$22.95. Order yours from Charlie's R/CGoodies, P.O. Box 192, Van Nuys, CA91408.

PRATHERPRODUCTSR/C BOAT RADIO BOX

Prather Products, well knownmanufacturer of R/C model plane kits,and recently, R/C boat kits, hasannounced its new epoxy-fiberglassradio box, designed for the new Prather40" Dee Vee, as well as many otherboats. It features tinted Lexan cover,plywood bulkhead, pine rails, andaluminum nut plates. It is expeciallyshaped to safely and securely hold allthe radio components, while stillproviding the necessary clearance forthe engine tuned pipe when one isinstalled. The box is 6%" high, and 5"wide. The highest point, the servo side,is 272", and the low side tapers from 1 %"down to IV4". Designated as No. 8100,Prather's radio box sells for $16.95, atyour favorite R/C boat supplier. Orcontact Prather Products, 1660Ravenna Ave, Wilmington, CA 90744.

CHARLIE'S R/CGOODIES MIDGETSERVO

Small in size, but large in quaiity andfeatures — Charlies R/C Goodies newMidget Servo is now available. As far aswe know, this is presently the smallestservo in production, being only 11/16 xI.Vax 1-13/32" in size, and weighing only.885 ounce. In spite of the small size anddimensions, it develops 5 pounds ofthrust, and has a 100 degree operatingtime of .3 second. The electronics aredesigned around the proven SigneticsNE 544N integrated circuit, with externaldrive transistors. It is available both

GIEZENDANNER

STAB MECHANISMSTwo interesting items, designed and

tested by the internationally famousBruno Giezendanner are now availablehere in the US. Both are for improvingand simplifying horizontal stabilizerinstallations. Part No. GMP-900 is aFlying Stab Mechanism, recommendedfor Don Lowe's Phoenix 8 and similardesigns. It is extremely light in weight;less than 1 ounce, uses precisionbearings and an aluminum crossbar.Precision nylon crossbar sockets and allinstructions and parts are included.Price is $14.95. Part No. GMP-901 is a

76

Removable Stab Mechanism, which

allows removing the entire stab foreasier model transport or storing. It too,is light in weight; less than 1/2 ounce,and is also constructed of precisionnylon and aluminum parts. Withinstructions, only $8.95. FromGiezendanner USA Modeling ProductsInc., P.O. Box 818, Pottstown,Pennsylvania 19464.

PAP7ICI0ANT3 rN THE

IX WOPLO AEPOBATIC

CHAIVIPiaNSHIPS

• C MOPP'SON

"AEROBATIC AIRPLANES"

BY REPLA-TECH INT'L

Bob Morrison of Repla-TechInternational, has many talents weappreciate; he picks great airplanes towork with, and his drawings and plansare guaranteed to make you wish theworkbench was clean so you could startcutting out pieces. Bob has recently puta lot of his material together into a 48page publication, entitled "AerobaticAirplanes, Participants at the IX WorldAerobatic Championships," which isnow available both from retail outlets

and direct. This book contains detailed

drawings, photos, and descriptive dataof the airplanes as mentioned in thename. The price is $3.95, plus 50cpostage, if ordered direct, fromRepla-Tech Int'l, Inc., 48500 McKenzieHwy., Vida, Oregon 97588.

CANNON R/C SYSTEMS

G-MARK .061 ENGINES

Cannon Eelctronics, well knownmanufacturers of some of the smallest

and lightest R/C systems available,recently announced that it has beenappointed US agent for the Japanesemanufactured G-Mark glow plugengines. These engines are to beavailable in both R/C and non-R/C

versions, and In displacments of .03,.061, and a twin .061 simultaneous firingtwin. The .061 is on hand now. It is

claimed to offer good idle, down to 4800,smooth speed transition with up to16,500 rpm — with a muffler attached.The recommended prop Is 6/3, 15%nitro fuel, and a short reach plug. Themounting dimensions are basicallythose of the Cox .049/.051 Tee Dee's.

The G-Mark .061 is priced at $39.95; theTwin is tentatively set at SI 09.95. Dealerand distributor inquiries are invited. Forfurther information send a self

addressed stamped envelope, toCannon R/C Systems, 134200-26Saticoy St., North Hollywood, California91605.

BOLINK'S R/C CAR WHEELS"If we don't have them, you don't need

them," might well be the motto ofBoLink/Champion, when it comes towheels and tires for R/C cars, sport orcompetition. It offers what is claimed tobe the industry's most completeselection of wheels, tires, and donuts;eight different wheel and six differentcompounds. An illustrated catalog Isavailable, which lists all the dimensions,both in inches and in millimeters. For

your copy, send $1.00 to BoLinkIndustries, P.O Box 80653, Atlanta,Georgia 30366.

BYRON ORIGINAL'S

MIG-15

Following the success of its wellknown Pitts BIpe, Byron Originals isoffering a new Mig-15 Ducted Fanmodel, for .60 power and its own fan unit,the Byrojet. The kit includes everythingrequired to get in the air, with theexception of radio and engine. It

features a hand laid fiberglass fuselage,die-cut wooden parts, and impactresistant injection molded polystyrenefoam components which require noshaping. Fan unit, pushrod, radiocompartment and thrust tube are factoryInstalled. All control surfaces utilizecenter hinging, requiring only standardservo power for proper operation.The fan unit is lightweight, yet rugged,

made from glass filled nylon, and matesperfectly with most Schnuerle .60's andrequires only low nitro fuel, A specialstarter extension is required to crank themid-fuselage fan installation — it, too, isfurnished. The Mig-15 is scheduled to beavailable in the fall; look for it at yourfavorite shop, or inquire from ByronOriginals, P.O. Box 279, Ida Grove, lA51445.

5^^

PARMA INT'I 1/12 SCALE

R/C CAR BODIESMore goodies for the R/C car fan,

these from Parma Int'l., 13927 ProgressParkway, North Royalton, Ohio 44133.Pictured are the Thunderbird stock car,and the Toyota, both in crystal clearlexan. As with most Parma bodies, theyare available clear, or painted, in variousParma paint colors. Now at your dealers,or inquire direct.

MIDWEST MODELS

1/4 SCALE INSTRUMENTSFrom all indications, the big birds are

definitely here to stay, and we are seeingmore and more designs andaccessories made especially for them.A recently realized item which fills adefinite need Is a set of scaleinstruments imported and distributed byMidwest Model Supply Co., 1354Naperville Dr., Romeoville, IL 60441.The Instruments are manufactured bythe well known Modellbau Wanitschek inGermany, and are made in three pieces,a bezel, appropriately colored faces and

77

THE THIRD ANNUAL

CONSUMER TRADE SHOW

JANUARY 12 & 13,1980

Pasadena Center, Pasadena, CaliforniaHOME OF THE FAMOUS ROSE PARADE & ROSE BOWL

SEE THE LATEST PRODUCTS AND VISITWITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF:

* • model ENGINES• RADIO CONTROL SYSTEMS

^ * • MODELING ACCESSORIESINDOOR DEMONSTRATIONS

STATIC DISPLAY COMPETITION IN MANY CATEGORIES

SEE INDOOR R/C RECORD TRIALS AND FIRST R/C ROBOT CONTEST

• MODEL AIRCRAFT• MODEL BOATS• MODEL CARS

OVERSEAS EXHIBITORS CORDIALLY INVITEDINTERNATIONAL MODELER SHOW. BOX 127. COSTA MESA. CA 92627: (714) 548-4700

SHOWCASE '79

from page 77/76

clear plastic lens. To assemble, theadhesive backed face is applied to thebezel, the lens is snapped in, and theentire instrument is then glued on thepanel. Simplicity itself, and extremelyrealistic, with very little time or effortconsumed. To simplify things for thoseof us not that familiar with aircraftInstruments, a printed guide is included,which shows which type of face goeswith each instrument. Various squareand round bezels are furnished, to be

l l l l l i l l l l l l l i !|l!i| l [ l|l

used as required, A total of 21

instruments are included in the package,everything from altimeters to oil gauges.Even sailplane instruments areincluded, as is a nice little radio completewith tuning knobs and frequencywindow. The complete set is $9.95,available now. Look for them at yourfavorite hobby shop, or order direct fromMidwest Model.

DAVIS DIESEL'S

OS .60 CONVERSION

Bob Davis, long time proponent ofdiesel power, and manufacturer ofnumerous diesel conversion kit for glowengines announces the availability of his

to page 82

Join the Friendly JeaftiLive and work in beautiful North San Diego County, the gardervsppt in the"USA, only minutes to the beaches and .,t- l/2^hoc^^. th^ rri^^ajns'^^, skiihgEnjoy year around outdoor activity. Work with a' dedicated g%pgptra''dfocontrol enthusiasts. Our rapid growth has created op%nh^^or,rifa^Wists;^ipl^tic injection moldmakers,' rriechanical design engineers, and engineerirgelectronic technicians and electronic technician assistant.. ..

• ■■ ■- "-fL. _Send resume to. Kraft Systems, Inc., P.O. Box 1268. Vista, CA 92083. *

78

SPECIALSALE

OF KAVAN PRODUCTS

alouette 2

Jet

Ranger

New!Jatnmngarand alouette 2

TratnarpaiTnita movamant

vwftftina20ft (6m«tar^eircta |afiduptoS ft (I.Smatara) in aftituda

OtherwiseAhis

LIST SALE

ALOUETTE 2. fixed pitch, no. 2000 280.00 229.95

alouette 2. collective pitch, no. 2500 460.00 329.95

JET RANGER, no. 3000 600.00 479.95

ALOUETTE 2, fixed pitch, RIGIDCONVERSION KIT. no. 2000 R

54.75 42.95

ALOUETTE 2 collective pitchCONVERSION KIT. no. 2500A

252.00 1 99.95

ALOUETTE 2 collective pitch. RIGIDCONVERSION kit, no.2500R

228.00 179.95

JET RANGER. RIGIDCONVERSION KIT, no. 3000 R

201.75 159.95

JET RANGERNEW CLUTCH, no 3149 N

JET RANGER

NEW ROTORHEAD.no. 3302N

happentoyou helicopter TRAINER.no. 200

101.30 79.95

167.50 124.95

500.00 3 9 9.95

M

HOW TO ORDER:

Postage and Handling for USA only: Alouette kit $5.00 shipping and handling;Jet Ranger kit $15.00 shipping and handling; all modification kits $3.50 ea.,insurance Included. For C.O.D.'s add $1.00 extra. Visa and M/C orders include:card number, expiration date, and interbank number on M/C cards. Allow timefor personal checks to clear. California residents, add 6% sales tax. For fasterservice call (213) 506-7564 or stop by. For foreign orders write for shippinginformation.

MODEL PRODUCTSP.O.BOX 284, 11526 BURBANK BLVD. NORTH HOLLYWOOD, CALIF. 91603

BUD NOSEN MODELSINCORPORATED

BOX 105, TWO HARBORS, MINNESOTA 55616All kits feature all wood construction, fast assembly, huge rolled plans, assembiy instructions, machine and die cut parts, all necessary hardware and much,much more. Designed for .60 engines on up. Write for our illustrated catalog—50$.

standoff Scale

Formed ABS

cowl Kit -

$119.95

3 or 4 Channels

Flys like atrainer Kit -

$99.95

9' AERONCA "CHAMP" 102" BUD NOSEN TRAINER

1/4 size Standoff

scale 3 or 4

Channels Kit •

$99.953 or 4 Channels

No foam or

plastic Kit •

$79.95

airplans '"fi—Quadra economy

$129.95

+1/3 Size Standoff

scale 4 Channels

Kit -^ required

$129.95

1 /4 size Standoff

scale 3 or 4

Channels Kit -

$139.951/4 size Standoff

scale Molded

cowls Kit -

$169.95AUSTRALIA

EK Loglctrol Australia44 Macquarle Road

Earlwood 2206Sydney, Australia

SWITZERLAND

Blue Max

Modellflug-Technik AGAlte Landstrasse 122

SOUTH AFRICA

Radio Control World

202/4 Oceana House

Lower Burg St.

CANADAJohn Klassen Hobby Central

400 Guyler StreetThunder Bay, Ontario

OVERSEAS

DISTRIBUTORS

CH-8800 Thalwll Switzerland Capetown 8001 So. Africa

• Stand-off Scale

. 2.7

5" equals r

• 102"Span

• 16.5# fl

ying

wt.

• 1800 sq. in.

wing

• 26%" chord at root

^CicC '7

to-4

€li'

'<i'

spec

tacu

lar

102 ' P-51 D

KIT $169"

Mnu>)

4 channel rad

ios re

quir

edDesigned for

.60 engines

with

prop dri

ver

Very stable fl

yer

Proof of scale 3 views

Kit includes 21" canopy

No foam or plastic

6" spinner is no

t included

avai

labl

e di

rect

only $16.95

Huge rol

led Plans

Machine and die

-cut

par

tsDecals not included

BUD NOSEN MODELS, INC.

Box 105

Two Harbors, MN 55616

catalog 50C ^

The safegrinding wheel

TUF-GRIND

Reinforted to prevent breakageand shattering. Strong enough tocut and grind Just aboutanything — steel, fiberglas,plastics, wood, and so on.

it's the toughest and safest

grinding wheel available.Fits ail standard motorized

grinding tools.

2" TUF-GRIND &

MANDREL ASSY.

$3.98

H.O.B. Hardware

20134 State Road, Cerritos, Caiifornla 90701

Twinn-K, inc.P.O. Box 31228 Dept. 1200

Indianapolis, IN 46231

SHOWCASE '79

from page 78/76

latest conversion. After two yearsdevelopment and field testing, acomplete conversion kit for the OS .60 isunder production. This conversion isclaimed to transform your OS into apower plant free of glow plugs, sparkplugs, mags, points, etc., into a truediesel capable of swinging a 16/4" propat 10,000 rpm, with an idle as low as1800. It does so with extremely lowvibration, and at a flying weight of IV2pounds, including 8 ounces of fuel.Conversions are also available for theFox .15 Schneurle; K&B .21; ST. 35;OS .40 FSR; as well as the Cox .020,.049/.051, and .09. For furtherinformation and prices, send 40 cents toDavis Diesel Development. Box 141,Milford, CT 06460.

GRANGER WILLIAM'SGEE BEE OECALS

Who among us has not at one time oranother gazed at drawings or plans ofone or more of the Gee Bee and said

"Gee, if only..." add your favoriteexcuse ... Well, at least one of these

excuses has now fallen by the wayside— the markings! Granger Williams nowhas them for you, on high quality decals,for both the Gee Bee R-1, and the Z,Both are in 2" scale, and each includesall the markings as on the originalaircraft. $4.95 each, postpaid, directfrom Granger Williams, 181 Pawnee St.,San Marcus, CA 92069. □

6l.86-f69-9U-lwzfL AN 'oivddng•3AV NosuaddarezzsiDnaoud sdw

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diz axvis

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>10800 96uBa 0} esn •Aousnbsjj JB810 jo^ >|080o •

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lapojftj jsujuisuBJi —|8pO|AJ J8A!808U —

SiapOLU OAA) Uj 8|qB|!6AV •

iiBj sdjjsueqdJOOJ JO 8U0 U80AA JO 96e)|OAIBOIljJO B 0OB8J SdUdUBq U80A^Suju'jBM 8|q|pnB-6u!;6S|nd b saAfO •

96 fr 3$ A|uo lU3nV-d3MOd

ijoiiuouj sBbiioa iBOqiJO AjsueqB SB s}OB sh|d 'J9;eoo| suBid ;so| e puB8otA8p BujUJE/A Aouanbsj^ b p uoqoun]|6np 6 seq qoiqAA uj8)sAs Buuoiiuoujaiqipne 8}8|dujoo b s; {j9|v-ui9lsAsi9UO inoMijM aq O) pjo^je noA ueo

iMBN

S6'2e$A|uo

ld31V-|/\l31SAS

PRECISION BALANCE in ALL DIRECTIONSHere's the eQuipmmt you need lo give your props the very bestbal»ice-balance in all directions. CeieiullY crafted Irom top graderneteriais. BUBBLE BALANCER accomodates 3/16,1/4,9/32 propholes. Other sizes available on special order. Dealers invited.

„««« HOWARD B. HUEBL KPT dpostage. hantSing. ki Minn.add 4t4sales lai. No C.O.Oj Box 193 Route 4 Mankato, Mn. 50X11

82

CONTINENTAL 4B STATES (except Texas)

^1-800-433-2022TEXAS RESIDENTS ONLY

1-800-772-2313

FOREIGN, ALASKA,HAWAII &

PUERTO RICO(817) 738-2301

For Information(817) 738-2301

imtiDi

SUPER KAOS40 $3719

• 52" wingspan, 507 squares• .35-.49 engineDesigned for fun fiying, yet is capabieof maneuvers in the advanced ciass.Easy and simpie construction, a winter building project now, a crowdpieaser to fiy this spring I

COVERINGIvlonoKote Opaque or transparent., $ 5.60MonoKote Metaiiic $ 6.50EconoKote $4.25 or 3/$11.99Super Coverite $5.75 or 3/$15.99Siikspun Coverite $5.75 or 3/$15.99Permagloss Coverite $6.79 or 3/$18.99Day Glo Coverite $7.50 or 3/$20.99Coverite Graphics, 1" numbers $ .992 'numbers $ 2.19 3" numbers $ 3.99

MonoKote Heat Seal lron $13.99MonoKote Trim Tooi $10.99MonoKote Heat Gun $20.99Baisarite $ 2.25Glass Coat $ 2.25

RHOM RETRACTS

^ Trikes $78.00f Mains $56.00

L J CorsairMains .$73.00

Freon e«t,a FW-190 Mains. $58.00

Build with DREMEL#281 $40.99#371 $40.99^#381 $44.99#572 $62.99#580TabieSaw. $62.99#210 Drili Press . $16.99 ^#2215 D-Vise ... $20.99 ^

KRAFT RADIOS

KP7C w/14'sor 15's

$379.00

KP2A

w/14"s..

KP2AWw/14's..

KP3ASiw/14's..

iKP4Ar ' w/14's..

P w/15's..KP6A

w/14's..

w/15's..

$ 89.99$ 89.99$ 99.99$191.00$199.00$210.00$217.00

MODELING NEEDSCraft-Air ESV $16.99Craft-Air Fiite Box $19.99Devcon Epoxy, 9-oz.,5 minute or 30 minute $4.25 or 3/$11.99

DuBro Kwik Fiii Fuel Pump $ 6.95DuBro Muii-i-aire II S 6.99Edson Motor Mount, adjustable — $ 5.55Fox Large Cub-styie wheels, pr. 4" $ 6.294'/2"$7.69 5" $8.99 SVa" $9.99 6" $11.50

Hobby Poxy i $ 1.19Hobby Poxy ii $ 2.88Hobby Poxy III $ 3.49Hot Stuff, 14 grams $ 2.35Hot Stuff, Blue Line $ 2.99Hot Stuff, 2-oz $ 7.20M.E.N.GeliCell 12-vt. battery $23.95Miller #2017 Sprau Rig $54.99Prather Fuel Line, 30'roll $10.77Robert Super Pumper $12.99Robart Auto Mix $ 7.25Sullivan Starter $25.99Sullivan Deluxe Starter $28.00Silver Solder S 2.99Soft Glass $ 6.99Taylor Multi-Charger $19.99Vortac Exploding Bombs (2) $ 7.69Vortac Release Clips $ .79Vortac Release Mechanism $ 3.88Wiihold Glue ... 8-oz. $1.25 17-oz. $ 2.25Zinger Props, per dozen 8"$ 9.369" $9.36 10 " $10.80 11" $11.50

Robart incidence Meter $10.99X-Acto #11 Blades, 100 pk $ 9.60•T" Pins, V2-ib. bulk $ 4.99"T" Pins, 100 count $ .99

W« offer complete service on Kraft,Futaba, Logictroi, Pro-Line & World

radios. Call Ted White (817)738-2301

I.. H. Taylor

ft- POWER PACER$48.99

■BUILDERS' GIFTS—]

SUPER 1-fj nilSANDER lisle

....

Full HouseBuildac^curate

$41.99Converts to fuse jig.

CUSTOM CRAFT Oefuxe Kit

MITERSANDER$19.99

Produces precise angles, performs butt& edge bevel, square up, edge straighten. sheet & spar splice, slock sizing,compound bevel, gusset angle; sands dihedral angle on foam or built-up wing.

SIG

KUPPER'45" wingspan $lg99.09-.15 engine2-3 channel radio

Small sport flyer for fun events! Kitfeatures the convenience of ready-to-use molded foam wing with thestrength of a balsa fuse & tail. Buildinternal fuse sides directly on wood.All quality parts in every kit with step-by-step instructions. Why wait? Order

& get started.

Some iiems in limited quantity and advertised specials,subject to availability, will be honored until Dec. 10. 1979.Prices may change il retail price or discount structurechanges.

Tape or glue ttiis label to the Iupper right hand corner'of any ■envelope. Enclose order form Iand your check, money order ■or credit card number. No letterpostage necessary

1 No postage11 necessary

1 1 it mailed1 1 in the

United States

BUSINESS REPLY LABELFIRST CLASS PERMIT NO. 161 Ft. Worth, TX

Y market;POSTAGL WILL BE PAID BV ADDnESSEE

Dave

P.O. Box 2172 76113

3955 W. Vickery Blvd.Fort Worth, TX 76107

Phone (817) 736-2301

The Hobby MarketP.O. Box 2172

Ft. Worth, TX 76113

ONE SIZE nxs ALL!FOR WINTER-PROJECT BUILDERS

The Jungmeister builds fast, so it gets youquickly to the part you like—detailing. Goall the way; weight is no problem. She flies

best at 13 lbs. anyway!

FOR BIPLANE LOVERSThe agile Jungmeisterhas been the classic

acrobatic biplane for

over 40 years. Paintit military orcivilian— do Bevo

Howard's one.perhaps?

FOR QUARTER-SCALE BUFFSLike 'em big, but not too big? The Bucket

is true % scale, but at 65" span, it'llfit in your car. A schneurle .60 up to .90

works fine. No gear-drives needed.

FOR CONTEST FANSOur record for turning sport flyers into

scale-contest winners is unbeaten anywhere.Plait designs fly well, and have helped many

modelers get their first trophy.

FOR SPORT FLYERSVou who love flying most will find our newJungmeister is fun just below the pain level.Completely acrobatic at a slow realistic

pace, and it laughs at rough fields.

The Biicker Jungmeister.Each kit custom-made and signed by Dave Platt.Not available thru stores. Sold only direct to give youthe best price possible. We pay U.P.S. shipping.

Complete kit $119.00

In only four monthsthe latest Mk. II

Duellist design hasestablished a

reputation as "themost thoroughlyrefined and provenR/C twin ever". Fast,beautiful, impressive—yet completely safe atslow speeds or withone engine out. Allbalsa construction.

Span 69" for two similar .25—.40 engines.

SUSLLXST XZ Cortip/efe kit $79.00Dave iviodels inc y/SA

Send envelope for detailed leaflet. Charge cards welcome.6940 N.W. I5th St.. Plantation. Fla. 33313 Phone (305) 587-4861

/■BIG BASH MODEL AIRPLANE

CONTEST & SWAP MEETSaturdays, November 17 & December 8, 1979

CONTEST:Entry fee is $1.00. Models must be on

display no later than 11:00 a.m. toqualify. Judging: 1-10 pts., totalappearance: 1-10 pts., presentation; 1-10pts,'quality of work. Prizes will beawarded in three classes: R/C, U-control,rubber band. Judging over at 1:00 p.m.,results announced at 2:00 p.m.

SWAP MEET:Any model builders who have models or

merchandise they wish to buy, sell, tradeor swap can get a table for the day for$2.00. Advance tickets can be purchasedfor $1.00 from Big Bash or your modelairplane club. Clubs can return anyunsold tickets for full refund. Clubs carlbuy tickets for 50 cents each.

Vi

For Furilwr InformiUion,THE BIG BASH HOBBY SHOWS

D & TIOGA STREETS — PHILADELPHIA, PA 19134 — (215) 427-3700

HERE'S HOW

from page 68

to the entire framework. This will seal thewood, inhibit the return of the moisture,and reduce the bubbling and wrinklinglater on. Incidentally, the pin holes willnot show through the covering.Permagloss also hides wood grain andslight imperfections much better thanthe plastic films. And, It's ten timesstronger!

Another neat wrinkle I ran across wasto cover the seams with a strip ofPermagloss with pinked edges.Normally the seams are placed on theunderside where they cannot be seenfrom the top. However, If you look at a fullsize aircraft, covered with fabric, you willfind pinking tape used all over it, mainlyto reinforce the seams and cover the ribstitching on the wings and tail surfaces.What I generally do is lay thePermagloss on a table dull side up (glueside), strike off a series of parallel guidelines about 1/4" to 5/16" wide using asoft pencil and cut along each line withpinking shears. Pinking shears are notgenerally very long so, after each cut,line up the pattern with the precedingcut. Do a neat job and cut the strips longenough to take care of the application.Iron on these strips where all seamsoccur, covering the seams, especiallywing tips, leading and trailing edges offlying surfaces, and fuselage seamjoints. You'll be amazed at how muchmore professional your covering job willappear. Maybe, someday, we can talkthe Coverite people into providingpre-cut rolls of pinking tape ofPermagloss and Super Coverite. Fornow, we'll have to cut our own. Dropthem a line and ask for their instructionbooklet. Better yet, buy a roll of SuperCoverite or Permagloss and you'll findone inside. It certainly is super coveringmaterial.

The idea presented on the sketchpage was sent to us by our good friendDon Grassi of Bedford, Massachusetts.You may remember Don's fineadvanced sport pattern design calledthe Avatar presented in the June 1979,issue of RCM. I had the privilege of doingthe plahs. Don has designed many otherairplanes and sent us this simplemethod for steering a tail wheel that Isforward of the rudder post. Don's ideahas the distinct advantage of having nointernal connections to lose adjustment.Once set up, it stays that way. A simple360° bend in a threaded (at both ends)rod that fits loosely over the tail wheelarm is all that is required. Of course, the360° bend must be located so that the

86

tail wheel arm and rudder are set in

"neutral" position. It must also be notedthat the amount of throw in the tail wheel

can be controlled by the location of theloop with respect to the centerline of thetail wheel. The fuel line slipped over thearm is there to eliminate the metal to

metal aspect. Give it a try on your nextship. It eliminates the tail wheeladjustment once installed. □

PIT STOPfrom page 67/66

7. Roger Curtis Assoc.8. Kevin Orton Leisure9. Jeff Rold Assoc.

10, Paulo Catucci LeisureAll of the Main event motors were

opened up by the Tech Committeeconsisting of ROAR President RickPerry, Gary Kyes and Mike Reedy.Motors were checked visually forcompliance to ROAR rules and the 1stPlace motor was unwound and the turnscounted on each pole.

1/12 6 CELL STOCK CLASSThis is also a 6 cell Can Am Outdoor

class using stock motors but allowingmodified chassis, ball bearing axles,wheels, etc. That man. Kent Clausen,continued his fast ways by being TopQualifier again and increasing the laptotal to 33 laps, again, with a stockmotor!! What's so amazing about Kent isthat he's only been racing less than ayear, but he has the perfect line and justdoesn't make mistakes when he's out infront. Jeff Rold was 2nd qualifier with 32laps and I was in the same heat with Jeff,also turning 32 laps and 8 secondsbehind Jeff. But I was only 5th qualifier.Qualifying was so close, that betweenJeff and I came Roger Curtis, 3rd. andMike Lavacot, 4th. These electric racesare really close. Gary Kyes got a 5' jumpstart to begin the Main Event and withthat much head start you're guaranteedgetting through the first corneruntouched, and Gary put the advantageto good use. After the cars got sorted outgoing through the first corner, 17 yearold Mike Lavacot was in hot pursuit ofKyes. It took Lavacot a few laps to catchKyes and then he just sat on Kyes tailwaiting for the right moment to pass. Ittook a few laps, but Gary went a little toowide in a corner, Lavacot slipped by totake the lead. In another couple lapsKyes was passed again, this time byCurtis Husting. But one of the mostamazing performances was going on byKent Clausen. At the start of the racenine cars went forward and one wentbackwards! ! Kent uses specialconnectors (no more) and he pluggedhis motor in backwards. By the time MikeReedy realized what was happening,and plugged the motor in correctly, Kentwas almost one lap down. But then hedrove so well he worked his way all theway up to 4th Place behind Kyes.

A letter to you from Dave Platt..._ inc

frecuently

\ \t.3 ^eceiv® ^ ^3®if'

;ate clarirv I,Jne Daveiducts- j-eive a '3®

near MoaeVct

My company this cOT»P^y„'^iaUvI^own °Tny interest, tn the«ith ahy o the_spitf^«,; tty

iy rSnc^at^V - ^^dertraaccon.p3hy ^%ith aw other Spitfrre^ ^ tvi

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Dave Platt

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Lavacot continued on for the win withCurtis 2nd, and Kyes 3rd.

1/12 6 CELL STOCK CLASS1. Mike Lavacot2. Curtis Husting3. Gary Kyes4. Kent Clausen5. Jim Aguirre6. Jeff Rold7. Mike Rowland8. Gene Husting9. Eric Hahn

10. Roger Curtis

Assoc.Assoc.

MRPAssoc.ParmaAssoc.Assoc.Assoc.

JerobeeAssoc.

1/12 4 CELL STOCK CLASSThe 4 cell cars are normally run

indoors and they were scheduled to runindoors at the Hylton Hotel, until when,at the last minute, the Hylton decided tocharge rent for the hall which wassupposed to be free, The rental fee wasimpossible, so the indoor races wereheld outdoors.

The MORCAR club set up the indoortrack which really looked small afterrunning on the modified 1/8 track. It wasonly 60' long, which is the same size Itwould have been indoors, but it lookedso small outdoors. Roger Curtis, MikeRowland and I had made all the Mainsso far, but we all agreed we weren't anycompetition for these younger racerswho were dominating the winner's circle.When we saw this small track wethought we had it made. We figured thereason we weren't competitive enoughwas the outdoor track was too big for usto see as easily as the younger drivers.Standing on top of the drivers' stand wecould see every last square inch of thissmall track, so now we'd show themsome real driving!

I was up among the first group andreally did fantastic, or so I thought! I cutall the corners within 6" to 10", never gotstuck in the boards, passed cars left andright without touching them and easilywon my heat, turning 33 laps. I waspleased with my performance. Rogerturned 32 laps in his heat and Mike had31 laps. Our logic certainly was working— until Curtis Husting ran, that is. I'm notabsolutely certain about this, but I thinkthat small track must have looked smallto Curtis too. Otherwise, how could hehave possibly turned 36 laps? Justbecause he cut all the corners within 1"never making a mistake, making it lookso easy. On top of that, Kent Clausenturned 35 laps and Jeff Rold turned 34laps and Mike Rowland didn't evenmake the Main. So much for our logic!

We were getting ready to start theMain and it started to cloud up. RickPerry was hurrying everyone up to thestarting line to beat the rain whileexplaining if we got half the race in itwould be official, otherwise we'd go byqualifying times.

The race started and Curtis took off inthe lead with Kent Clausen in second.There was quite a bit of talking going onamong the drivers, but I would hearCurtis chanting, "C'mon rain, C'mon

to page 90

88

Aero Sport Stx Syttems Include: 6 channelreceiver, 6 channel transmitter, all Ni-Cadt forboth transmitter & receiver airborne, dual charger (charges both sets of batteries at the sametime), four (4) NS-IC servos, servo trays,extra servo wheels. Instruction book, freauencyflag and full ISO day warranty. 72 mHz only.I849»aero sport six

Radio Control System

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aero sporttliree IDS'*

Aero Sport Three Systems Include: 3 channelreceiver, 3 channel transmitter, both for AAAlkaline battery operation .(batteries not included), two (2) NS-IC servos, dry airbornebattery box, switch harness, frequency flag,servo trays and full tGO day warranty. Choiceof 72 or 75 mHz.

aero sporttwo

7999Aero Sport Two Syttems Include: 2 channelreceiver, 2 channel transmitter, both for AAAlkaline battery operation (batteries not Included), two (2) NS-IC servos, dry airbornebattery box, switch harness, frequency flag, extra servo wheels and full ISO day warranty.72 mHz only.

aero sportfour t69>*

Attfi Sport Pour Systems Include: 4 channelreceiver, 4 channel transmitter, all Nl-Cadt forboth transmitter and receiver airborne, dualcharger (charges both batteries at the sametime), four (4) NS-IC servos, servo trays, extra servo wheels. Instruction book, frequencyflag and lull ISO day warranty. 72 mHz only.

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PIT STOP

from page 88/66

rain," over and over again. The windpicked up and 3 minutes into the race itstarted to rain. I yelled out "It's raining uphere," but Rick was below the driver'sstand and still dry and he said, "Keepracing, there's only 45 seconds left to thehalfway mark." So we kept running. Bythe halfway mark, there was a torrentialdownpour going and Rick called the raceofficial. Incredible!! The first time in

history an indoor race was rained out!Curtis was in first, Clausen 2nd, and JoeAlves was in 3rd.

This was a stock motor class and

Curtis' motor was unwound and found tohave 34 turns of wire on 2 poles and 35turns on the 3rd pole. The rules call for aminimum of 35 turns. The Igarashifactory has obviously made a mistake inwinding this motor. In our local races wewould have declared this motor within

tolerance, knowing one turn more or lesswill not make a noticeable difference in a

motor's performance. But for a Nationalevent it must be 35 turns, so Curtis'motor was disqualified. It's a tough wayto get disqualified on someone else'smistake, and after such a fantasticdriving performance, but it had to bedone this way. This moved Clausen intoFirst Place and his motor was unwoundand was okay.

4 CELL STOCK CLASS1. Kent Clausen

2. Joe Alves

3. Gene Husting4. Mike Lavacot

5. Jim Welch

6. Eric Hahn

7. Jeff Rold

8. Roger Curtis9. Gary Kyes

10. Curtis Husting

Assoc.

Speed DesignAssoc.

Assoc.

MRP

Jerobee

Assoc.

Assoc.

MRP.

Assoc.

Would you believe two more indoorraces got rained out? We were

supposed to run the final two indoorraces — outdoors, on Saturday, but itrained all day Saturday, so the two raceswere cancelled.

I believe all the racers would like to

thank all the MORCAR members, andespecially Tim Wilson, for doing animpressive job in staging theNationals. □

PITTS S-2 'from page 64

— by sanding,then back to the basics of silk and dopefor the final covering. I did not feel thatthe plastic type finish would do theairplane justice. Besides, I wanted topeel dope off the fingers once again. Mychoice was Royal Silron and Aero Glossclear dope followed by acrylic lacquerforthe color, Black fuel line was split andused for cockpit and windscreen. Muchthinking went into the paint scheme.Who wants an everyday Pitts type finish!The result was as the pictures show(yellow, white with black pin stripe tape),quite impressivel Overall weight at thistime with no gear was 6 lbs.Engine:

I went with a Kraft .61 plus a TatoneManifold #EM-3 which allowed a scaletype exhaust system out the bottom ofthe cowl. A 12 oz. round fuel tankinstallation did not crowd anything in thefront end. Access holes were drilled inthe cowl for the needle valve and glowplug, There is more than enough roomfor any size .60 engine.Radio:

Radio room is more than enough. Infact, you could install a back-up system ifyou so desjred, honest! It was a pleasureto work on a scale airplane with thatmuch room. Figure on a lot of foamaround the receiver and battery pack, as

to page 92

90

KWIK-HINGESLOTTERFOR LARGE AND

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THE ONLY UNIVERSAL SLOTTING

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The black oxided, hardened steel

blades fit neatly in a no. 2 x-actoknife handle and work in conjunctionwith our handy alignment jig thatfeatures 3 interchangeable snap-onguides. Two for large and small leafhinges, and one for drilling 3 standard size holes to match any type ofhinge you choose to use.

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insure the finest quality available. Entirely flash free for smooth, quiet operation. They are simple to instal l using aknife blade or the Du-Bro Kwik-HingeSlotter. (Cat. No. 216.) For total holdingpower, these hinges are embossed andhave 6 holes on each side. Safer than the

removable pin type, our hinge pin isalready locked in place.

No. 116 (6 each) SI. 10 No. 117 (15 each)

SMALL NYLON HINGESJust the right size for those smaller airplanes. They're easy to install too, byusing the Du-Bro Kwik Hinge SlottingDevice. These rigid, nylon hinges areembossed and have 6 holes in each sidefor maximum holding power. For safety, each hinge is locked together at thefactory and checked for smoothness ofoperation.

No. 118 16 each) S1.00 No. 119 (15 each) $1.95 J

DU-BRO KWIK-SWITCH MOUNTTHE SIMPLEST, FASTEST AND EASIEST WAY TO

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This complete switch mounting set enables you to installyourbattery switch in minutes, anywhere in the fuselage,by drilling ONE. 3/16" hole!!! Excellent for use in planes,helicopters, boats, and cars. This attractive, black nylon

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GLO-PLUGCONNECTOR

For engines .10 Sup One piecebrass barrel snapson to plug forpositive starting.24 -1/2" long withattached batterylugs. An excellentaccessory fortoday's kind ofmodeler.

No. 147 $2.25

91

Ten years ago weopened Hoboy World.

None of us can avoid the tumps and bruises we get from oldfather time but we can ail be better off for the experience... bytaking encouragement from the victories and by learning fromeach mistake.

We've been in business ten years now and we've grown andprospered. For this we are grateful.Many firms have crashed along the way. Of the continual .

advertisers in R.C. Modeler, {starting with July 1969) only 3quality firms have taken their lumps from old father time andkept on flying. They are "Ace Radio Control, Inc.", "WorldEngines" and "Hobby World". • .You can benefit from our experience by letting us help with

any R.C. project. We'd like to help you take your lumps fromthe "old man" and maybe get in a few of your own.

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PITTS S-2

from page 90/64

there is a lot of space up there. I used aKraft Series 75-7B radio with KPS-14

servos. All were installed in trays as perthe manufacturer's instructions.

Flying:So here we have a good looking

airplane and pilot (?) but are they wortha darn? Yes,, to both! The extra 5" or soover the standard Pitts make this model

a lot easier to fly (yes, I've flown theone-holer). Not at all sensitive on theelevator, if the C.G. is as shown on theplans. Ground handling is good toexcellent. Not like a pattern typeairplane, it is honest and predictable inthe air and especially so on landing.Conclusion:

While this kit shouldn't be suggestedas your first R/C project, it Is a snap afteryou have a bit of experience. Royal is tobe commended as this kit is excellent as

is the complete Royal line. Try atwo-holer. We think you will like it and it ismore fun with a two holer! □

BIG IS BEAUTIFUL

from page 63

current retail prices, you'll discover thatmy spruce is a real bargain! Not tomention the fact that it is absolutelyperfect wood, with nothing to throw awayexcept the sawdust, and even that's toonice to discard! (My source is SportAviation, E2651 Number 3 Road,Richmond, B.C. Canada V6X 2B2.) Isuspect you will find that there aresuppliers to the homebuilt market allover the country and that they would beable to supply the wood you need if youcannot find anything locally that suitsyour purpose.

I use the spruce for longerons and forthe normal things we'd use strip woodfor. I have used cedar for leading edges,and such items, in that it is a bit softer,lighter and, therefore, works a littleeasier than the harder spruce.

For filler blocks (i.e., wing tips, cowlblocks and that sort of thing) 1 prefer touse polyurethane foam. Sig sells this asa two solution material that makes about25 times its original volume in a foamthat will accept fibreglass resin right ontop of it. Handy for finishing and a lot lesstrouble than trying to find large (andexpensive) chunks of balsa for the samepurposes. This material is used as anInsulation and should be readilyavailable almost anywhere. It can begotten in sheets or in the two liquid formwhich is great for making small bits youneed and even for filling areas which youfeel need a bit more support from the

to page 94

92

Superscaledeloll vour RC12E. OurLexon* Toj-303/ Coswoiih, vocuum-tormed bodvlaaluring cuslom paintond hand-fabricated cold altbox. mirtor ond "Warsieiner" sponsor decols (not Included In kit).

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THE RC12E'S TRACK RECORD AT THE NATS

ROAR Nationals Expert Class 1:12 Scale Electrics

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19784ceil No event MRP RC12E

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19794cell No event R012E No event

6cell RC12E RC12E RC12E

'4 cell cars run indoors, 6 cell cars outdoors. Chart shows all expert class main eventsunder olttclal ROAR sanction since the RC12E wos Introduced.

The Nais-wlnning RC12E features die-cut fiberglass chassis, lightweight racing wheelsand tires, tough glass-tilled nylon pillow blocks ond complete, detailed Instructionsincluding racing tips from Gene Husling and Roger Curtis. Approved lor ROARcompetition.

The Team builds that experience into everyRC300 and RC12E competition car kit. And now thephenomenai RC12E is even avaiiabie assembled,tuned and ready-to-win. So whetheryou're ready for thehigh-powered gasclass or looking forthe easy maintenance and tightdicing of 1:12electrics, we've gotyou covered.So join forces

with the Team. We've got the magic if you've gotthe touch. ' . '

It's a gosl The new 1:6 scale AssociatedRC300 sweeps the 1979 ROAR Wlnlernots InFlorldo...1-2-31 !

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$18.00 labor plus partsEXPERT SERVICE ON ALL

KRAFT PRODUCTS

K.S.E., TOWER. P.C.S.

DEALER SALES ON E.K. and PRGLINE

RADIOS and ACCESSORIESWARRANTY REPAIRS ON:Ace. E.K, Logictrol, ProLine

REPAIR SERVICE FOR:

ORBIT (We have all available parts &repair facility for Orbit Systems) •

WORLD, FUTABA, CIRRUS, MICRO.CANNON. R.S. SYSTEMS, M.R.C..ROYAL, HOBBY LOBBY, BONNER, MAC'S

PPAI IQ\y1T SCALE ACCESSORIESiXL/mLIOIVI • BY WILLIAMS BROTHERSRADIO CONTROL

CONTROL-LINE

FREE-FLIGHT

SCALE PILOTS • SCALE WHEELS

CYLINDERS • ENGINE KITS ■ MACHINE GUN KITS

PLASTIC DISPLAY MODELS

SEND SOe FOR COMPLETE ILLUSTRATED CATALOGDEPT. RC

181 PAWNEE STREET, SAN MARCOS, CA. • 92069

BIG IS BEAUTIFUL

from page 92/63

inside. Be careful that you do not confinethis mixture while it is foaming upthough, as it will develop tremendousinternal pressure and tear things uppretty good!Wing ribs don't really require a lot of

strength (except where they are part ofwing mounting): fuselage formers thesame except where they support theloads of landing gear and enginemounting, so most of mine are made upfrom mahogany door skins. They arecheap as dirt (approximately $1.49each, on special and with some slightdamage) and a couple of them will builda lot of wing ribs and formers!Where rea! strength is required, it's

hard to beat ordinary plywood, the samestuff you'd use to handyman around thehouse with and if you are using it for afirewall, lay a layer of glass doth andresin on it and you'll find it's more thanadequate.

Preparing the strip wood can be doneon any radial arm or table saw. (It's a bitof an overkill to use a radial arm saw for

Charfie Mills' Quadra powered big model.Desigried by Charlie Mills and Harvey Hilland called the Hill-Mill Special. Noperformance data available although ithas flown.

Jim Messer of the STARS designed andbuilt this Ercoupe and has both plans anda soon to be available kit. 'Coupe has bagsof hours on It and flies very well from allreports. Jim flew it prior to painting and itIs obvious the paintjob improved its looks!

Stinson Voyageur by Art Lane. 101" span,designed for the Quadra, plywood andcedar construction - not yet flown.

to page 98

94

ROYAL REALISM...from the outside in!

Royal scale aircraft ha/e long been known for their authenticity andflyability .Now, this meticulous craftsmanship has been carried one stepfurther — right into the pilot's seat! Everything from seat belts to instruments are included in these micro-molded plastic interiors . Thesides, dash, seat and flooring come in modular sections which are easilyassembled .The end result: a new dimension in scale realism Available

at your local hobby dealer.

Now Available.60-.80 Size ($9.95)

CorsairFW-190SpitfireZero & P-51

Bearcat

VzASize ($6.95)CorsairP-51Zero

.40 Size ($8.95)P-51Zero

Corsair

.20 Size ($7.95)ZeroP-51

More to come!

THERMALON

N

A REVOLUTION'

IN MODEL COVERINGS

FEATURES• WORKING TEMPERA

TURE: ISQC (300F)

• FABRIC IS THINNER

AND LIGHTER THANCOMPETITIVE IRON-ONFABRICS

• THE FINISHED GLOSS

ON ULTRAGLOSS IS

COMPARABLE TO THEPLASTIC IRON-ONS

AVAILABLE IN RED.

^ WHITE. BLUE, ORANGE

& YELLOW

« SUPERIOR HANDLING(■HARACTERISTICS ONCPMPOUND CURVES

About the ProductThermaion developed by Royal tocombine the JU9''ty. strength and beauty of a silk ."^d dope finish with theconvenience, s^eed and ordorless application of the p'asdc iron-on films.

SUPERWEAVE THERMALON• Unprepared surface which is

ready to iron-on and paint orfly If fuel proofing is unnecessary.

• 44"x41" $9.95• 44"x15' $39.95

ULTRAGLOSS THERMALONThe one-step Instant finishtt Fabric is ready to iron-on — no

painting or further finishing isnecessary.

• 44"x38" $11.95• 44"x15' $51.50

ROYALPRODUCTS790 W.TENNESSEEDENVER. CO 80223

The Royal Line of SCALE R/C KITSWING AREA PRICE

.60-.80 SIZEA6M5 Zero 706 sq.Spitfire 736 sq.Cessna 700 4/5 sq.F8F Bearcat 652 sq.FW - 190 Focke-Wulf 642 sq.Ju 87-D Stuka 723 sq.F4U - 1 D Corsair 669 sq.Kl -43 Oscar 613 sq.Piper Colt 946 sq.P -51 D Mustang 777 sq.Ki - 61 Hien , , . 676 sq.Spirit of St. Louis 958 sq.Pitts Special 856 sq.Pitts S-2 830 sq.Staggerwing Beech 907 sq.Cessna 206 654 sq.F4J Phantom 477 sq.ME -109 Messerschmitt 697 sq.

.40 SIZEP - 51 D 576 sq.Bleriot 564 sq.Spitfire 496 sq.Zero 577 sq.Piper Colt 527 sq.Hien 468 sq.Corsair 480 sq..20 SIZEZero 356.5 sq.P - 51 D Mustang 372 sq.Cessna 172 388 sq.Cessna 182 405 sq.Bleriot .09-.15 388 sq.

TWINSC-47Skvtrain .40-.61 Size .767 sq.Cessna 310 Q .35-.61 Size .725 sq.B - 25 Mitchell .40-,61 Size .750 sq.Cessna Skymaster ,35-.61 Size ,754 sq.P - 38 Lightning ,35-.61 Size .695 sq.P68 Victor ,19-.25Size ,502 sq.B1 7 Fortress ,15-.20 Size .806 sq.y^A SIZECorsair .049-,051 Size . .229 sq.P51 D Mustang .049-.051 Size . .217 sq.Zero .049-,051 Size. .232 sq.

•$99.95•$99.95$94.95•$99 .95•S:99.95$94.95

*$99.95$89.95$94.95

•$99.95$94.95$99.95$84.95$89.95$94.95$•99.95$89.95$94.95

*$79.95$54.95$59 .95

•$79.95$59.95$59.95

•$74.95

•$55.95•$54.95$56.95$64 .95$39.95

in.$ 119.95in. $99.95in. $109.95in. $109.95in.$114.95in, $89.95;n.$149.95

in. •$39,95

in. •$39.95in. *$39.95

'Contain scale cockpit kits

NEW

S R

OS 50 FSRWe are pleased to share with OS the announcement of the new 50 FSR. This middlesize Schnuerle will take its place beside theOS 40 and the OS 45 FSR's. The 50 has a

slightly larger frame than the 40 and the45 but it is substantially smaller than the 60.If you are using a 40 or 45 size Kaos, forinstance, this might be just what you areiGoking for to put some more excitementin your life. This engine is also going to beoffered as a U/Controf engine. The wire sizefor the 50 is the same as the 45, whereasif you go to a 60, it is substantially heavierand you have to have longer lines. Havinganother engine in this size range will beexcellent for World Engines as the demand forthe 40's and the 45's has exceeded the supply.0S50FSRR/C $109.00U/Control Version $95.00

WORLD ENGINESWORLD ENGINESWORLD ENGINESWORLDWORLD ENGINES8960 Rossash Ave., Cincinnati, Ohio 45236Telephone (513)793-590^ Telex 214557

WORLDS Products Available From:ARKANSAS

Sherrill's House of Hobbies34Q8 S. UniversityLittle Rock, AR 72204

CALIFORNIA

Active T.V.. Hobbies & Crafts717E.Maln St.Santa Maria, CA. 93454

Authorized Radio Control915 N. Main St.Orange, CA. 92567

Covina Hobby Center140 N. Citrus Ave.Covina, CA. 91722

Evett's Model Shop1636 Ocean Park Blvd.Santa Monica, CA. 90405

Franciscan Hobbies1935 Ocean Ave.San Francisco, CA. 91127

The Hby. Co. of San Francisco5150 Geary Blvd.San Francisco, CA. 94118

The Hby. Co. of San Francisco217SuttBr St.

San Francisco, CA. 94106

High Flight Hobby Shop38126 6tb St., E.Palmdale, CA. 93550

L.R. Taylor 8i Co.20831'/: Roscoe Ave.Canoga Park, CA. 91306

R/C Hobby Mart9219 Folsom Blvd.Sacramento, CA. 95826

Smith Bros. Hobby Center8941 Reseda Blvd.Northridge, CA. 91324

Smith Bros. Hobby Center1542 Los Angeles Ave.Sim! Valley, CA. 93065

Smith Bros. Hobby Center16217 Victory Blvd.Van Nuys, CA. 91406

T & A Hobby Lobby3512 VU. VictoryBurbank, CA. 91505

COLORADO

Custom Hobbies2813 E. Plane Ave.Colorado Springs, CO. 80909

Tom Thumb Hobby Center7020 E. Colfax Ave.Denver, CO. 80220

CONNECTICUT

Al's Hobbles

54 Chestnut Hill Rd.

Norwalk, CT. 06854

Bristol Hobby Center641 FarmlngtonBristol Plaza

Bristol, CT. 06010

FLORIDA

Art's Hobby Shop103-34 Atlantic Blvd.

Jacksonville, FL. 32211

Farmers Sundries 8i Hobbies4926 E. BroadwayTampa, Fl. 33605

Field's Hobby Shop602 S. EdgewoodJacksonville, FL. 32205

Garand Hobbles605 Wood Rd.Seffner, FL. 33584

The Hobby House360 Hwy. 17-92Maitland, FL. 32751

GEORGIA

The Hobby Shop123 S. Broad St.Tbomasville, GA. 31792

B-N-8 Hobbies, Inc.6473 Hwy. 85Riverdale, GA. 30274

HAWAII

The Hobfaietat

1423 Tenth Ave.Honolulu, HI. 96616

ILLINOIS

Al's Hobby Shop121-123 Addison St.Elmburst, IL. 60126

Klipper's Toys & Hobbies1314Waukegan Rd.Glenview,IL. 60025

Stanton Hobby Shop4734 MilwaukeeChicago, IL. 60630

West Side Hobby2629 W. Main St.Belleville, IL. 62221

INDIANA

Mutcbler's Hobby4620 Crandell-Lanesville Rd.Corydon, IN. 47112PH: 812-366-3141

Spencer's Craft & Hobby2015 Ewing St. Rd.Seymour, IN. 47274

KANSAS

Modeler Hobby Shop947 Park Lane Shopping Ctr.Wichita, KS. 67218

KENTUCKY

Jackson Purchase Hobbies408 Reed StMayfield, KV. 42066

LOUISIANA

Hub Hobby Shop2618 S. Broad Ave.New Orleans, LA. 70125

TARTAN

Displacement: 1.34 cu.ln., 22 cc. Weighs 2 lb. 114 oz.(less muffler). Reed valve induction. Prop shaftdiameter - .550". Uses Supertigre Mag V seriescarburetor. Roller bearings lower end of rod, frontand rear ball bearings. Has short shaft in back. 3 boltradial mount, 3 7/16" center to center. Glo plugignition. No RF noise to bother radio, Runs good andswings 18" prop. Comes with muffler.Cat. No. 16292 Retail S175.00

LOUISIANA (cont'd)

Mercury Hobbies, Inc.Rte. 6, Box 734AMandevllle, LA. 70448

MASSACHUSETTS

FIdrer R/C17 Salmi Rd.Framingham, MA. 01701

N.E.R/C Service497 Central Ave.

Seekonk,MA. 02771PH: 617-761-6268

Ray's R/C Specialties12 Sherman St.Worcester, MA. 01610

The Hobby Hut47 Bank St., RearAttleboro, MA. 02703

MICHIGAN

Hobby World1049 28th St.SWGrand Rapids, Ml. 49509

Joe's Hobby Center17900 6. lOMile Rd.E. De&oit, Ml. 46021

Joe's Hobby Center33419 Grand River Ave.Farmlngton, Ml. 48024

Joe's Hobby Center7845 Wyoming Ave.Dearborn, Ml. 48126

Rider's Hobby Shop115W. Liberty St.Ann Arbor, Ml. 58108

MICHIGAN (cont'd)

Rider's Hobby Shop920Trowbridge Rd.E. Lansing, Ml. 48823

Trackside Hobbles418 Main SlRochester, Ml. 46063

Pate Waters

R/C Service Midwest41889 Joy Rd.Canton, Ml. 48187PH: 313-455-1380

MISSOURI

C.W. Reed54DBWoodsonRd.Raytown, MO.64133

MINNESOTA

Medical Center Cycle5640 W. BroadwayMinneapolis, MN. 55426

MISSISSIPPI

H&BModels319 W. MainTupelo, MS. 38801

NEBRASKA

Chick Bartlett's Hobby Town134N.13diSt.Lincoln, NB. 68508

NEW HAMPSHIRE

Fins Photo 8i Hobby ShopKings Hwy. PlazaStratham, NH 03865

NEW JERSEY

J.A. Deneke526 DoremusAve.Glen Rock, NJ 07452

NEW JERSEY (cont'd)

Hobby Hut567 Rt. 23Pompton Plains, NJ 07444

Paul's Hobby Sport 8i Marine540-546 Peterson Ave.E. Rutherford, NJ 07073

Tiny Tots Stores, Inc.19gU.S. RL 22, EastGreenbrook, NJ 08812

Tiny Tots Stores, Inc.Rt. 40 & Washington Ave.Pleasantville, NJ 08232

NEW YORK

Brown's Hobby Center6031 BroadwayBronx, NY 10471

Mardel Hobbies351 Altamont Ave.Schenectady, NY 12303

World Wide Hobby391 S.Main St.New City, NY 10956

NORTH DAKOTA

McGiffins1228 9th Ave. S.Grand Forks, ND 58201PH: 701-772-5311

772-5360

OHIO

Country fl/C12450 Amity Rd.Brookville, OH. 45309

Jack's Hobby ShopR29'.4 Walnut St.Shelby, OH. 44875

Hobby Stop4907 Summit StToledo,OH.43611

National Hobby Inc.6238 Ridge Rd.Cleveland, DH. 44129

Mark RIba Cabinets32094 Detroit Rd.Avon, OH. 44011

Pit 8i Prop Hobbies, Inc.6831 Flag Center Dr.Columbus, OH. 43229

W-K Hobbles19 N. Main StCenterville, OH.45459

Wife's Hobby Shop712 Bristol

Lima, OH. 45604

PENNSYLVANIA

Groff's Hobby Shop115 E. State StQuarryvllle, PA. 17566

J.C. R/C Hobbies23 Easton Rd.Willow Grove, PA, 19090

Skelly Sporting Goods2227 W. Market StYork, PA. 17404

TEXAS

H. Hobbs

4615 Banister Le.Austin, TX. 78745

VERMONT

The Hobby ShopRFDNo.1,Rt.7Swanton, VT. 05466

The Hobby ShopBurlington Square MallBurlington, VT. 05401

Midd-WayShop40 Court St.Middlebury.VT. 05753

VIRGINIA

Bob's Hobby Center3002 W. Cary St.Richmond, VA. 23221

WASHINGTON

Firgrove Model Supply10811-1360) St, E.Puyallup,WA. 98371

Stewart Enterprises429W.Chelan St.Wenatchee, WA. 98801

WISCONSIN

Pope's Hobby Land640 S. 3rd. St.Wausau, Wl. 54401

CANADA

Hobby DenNorU) Bay MallNorth Bay, Ont, Canada

Calgary Hobby Supply3920 EdmontonTrail NECalgary, Alberta

Can-Air Hobbies, Inc.5650 Blvd. Gouin OuestMontreal, Quebec, H4J-1E4

Dundas Hobby Supply16 Sleepy HollowDundas, Ontario

LeModele Reduh Enr.265, LaroucheArvida, QuebecPH: 648-2136

Mareoux Hobbies5 DuchesnayBeauport, Quebec

ENGLAND

MJ. Wllshera

Unit 10, Paramount EsLSandown Rd.Watford, Herts

GERMANY

Helmut Noll4660 HerneBHauptstr 6, Wast Germany

ITALY

G 2 ModelsVia A DA Mestre,31Mestre, Venice

¥lorld Engines8960 ROSSASH AVE., CINCINIMATI. OHIO 45236 TELEPHONE (513) 793-5900 TELEX 214 557