Transport Efficiency of Conventional Airships and Hybrid ...

©2018

Deutscher Luft- und Raumfahrtkongress 2018DocumentID: 480209

1

28.5%12.5%

21%

20%4%

15%

Weight split of conv. airship

Fabrics Tails Gondola

Propulsion Undercarriage Systems

©2018

Deutscher Luft- und Raumfahrtkongress 2018

2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 0.2 0.4 0.6 0.8 1

f_st

ress

Radi

us x

(1.2

q +

ICPI

xq )

x/L

Fabric stress parameterRadius x (1.2 q+ICPI x q)

Conventional: Rad x (1.2q+CPxq)Hybrid: Rad x (1.2q+CPxq)f_stress

©2018


3

51%

1%

11%

8%2%

0.4%9%

3%

4%2% 5% 1% 1%

Blimp drag split

Envelope Envelope accessoriesTail surface Brace cablesControl lines AccessoriesControl Car OutriggersNacelles Car & engine AccCooling Drag Handling linesMisc & Interf

©2018


4

0.01

0.1

1

10

0.1 1 10

K_in

d

AR_Splan

WT tests on AirshipsLifting Body Re-Entry vehiclesAircraft WingApproximation

1

10

100

0 50 100 150

Tota

l L/D

Vcr [kts]

Aerodynamic Efficiency L/D2t Useful Load

Blimp - Max. HeavinessHybrid - Max. HeavinessHybrid - 50% max. Heaviness

©2018


5

1

10

100

0 50 100 150 200

Tota

l L/D

Vcr [kts]

Aerodynamic Efficiency L/D20t Useful Load


0.10

1.00

10.00

100.00

0 500 1000 1500 2000

Fuel

bur

n pe

r ton

-mile

(k

g / (

t x n

m)

Payload (kg)

Fuel burn per ton-mileAirships with 2t useful load

35kts cruise speed

Blimp - 500nm mission rangeBlimp - 1000nm mission rangeHybrid - 500nm mission rangeHybrid - 1000nm mission range

©2018


6

0200400600800

100012001400160018002000

0 500 1000 1500 2000 2500

Payl

oad

(kg)

Range (nm)

Payload-Range Diagram2t Useful Load

Blimp Vcr=35ktsHybrid Vcr=35ktsBlimp Vcr=70ktsHybrid Vcr=70kts

02000400060008000

100001200014000160001800020000

0 1000 2000 3000

Payl

oad

(kg)

Range (nm)


Blimp Vcr=35ktsHybrid Vcr=70ktsBlimp Vcr=70ktsHybrid Vcr=130kts

0

50

100

150

200

250

300

350

400

450

500

5 25 45 65

Min

. Pow

er (D

x v

) [kW

]

Vcr [kts]

Minimum Power Required2t Useful Load


0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5 25 45 65 85

Min

. Pow

er (D

x v

) [kW

]

Vcr [kts]

Minimum Power Required20t Useful Load


©2018


7

02000400060008000

100001200014000160001800020000

0.0 1.0 2.0 3.0 4.0

Payl

oad

(kg)

Endurance (days)

Payload-Endurance Diagram20t Useful Load

Blimp - Vcr=35ktsHybrid - Vcr=47kts-35kts

0

200

400

600

800

1000

1200

1400

1600

0 50 100 150

Prod

uctiv

ity (n

m x

ton

/ hou

r)

Cruise Speed (kts)

Airship productivity20t Useful Load

Hybrid - 500nm mission rangeBlimp - 500nm mission rangeHybrid - 1000nm mission rangeBlimp - 1000nm mission range

©2018


8

0.0%2.0%4.0%6.0%8.0%

10.0%12.0%14.0%

Opt. Speed -Max. Payload

Opt. Speed - 50%Load factor

Opt. Speed -200kg Payload

Rela

tive

DOC

Relative DOC500nm mission range

2t Hybrid Airship compared to 2t Blimp

0%

2%

4%

6%

8%

10%

12%

14%

Opt. Speed - Max.Payload

Opt. Speed - 50%Load factor

Opt. Speed -200kg Payload

Rela

tive

UC

Relative Unit Cost (UC)500nm mission range

2t Hybrid Airship compared to 2t Blimp

0200400600800

100012001400160018002000

0 500 1000 1500 2000 2500

Payl

oad

(kg)

Range (nm)


Blimp Vcr=35ktsHybrid Vcr=35ktsBlimp w. Water Recovery - Vcr =35kts

©2018


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©2018


10

©2018


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Transport Efficiency of Conventional Airships and Hybrid ...

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