Battery Webinar
WHAT IS THE POWER CONSUMPTION?
3
How did you validate the power consumption of the a/c?
Simple power requirements can be obtained from general aerospace principles
Hover lift efficiency¹
[aircraft weight / power]
[kg/kW] [lb/hp]
12
1.7
kg/kW
7.3-
7
6
5
4
3
2
1
0
1
8
PROPELLER
4
4.88 10
10
100
Helicopter
LILIUM JET
Tilt rotor
100
Tilt wing
Lift-fan
1 000
10 000 [lb/ft²]
48 824 [kg/m²]
Disc loading
[aircraft weight / thrust area]
Direct lift
1 000 1,150 10 000
kg/m2
LILIUM Sources: 1. Hover vertical lift efficiency graph illustration from NASA SP-2000-4517; 2. For illustration only; 3.
Estimate based on Type Certificate jet configuration with a weight of 3,175kg; 4. Propeller-based eVTOL estimate
based on peer websites, press clippings and the NASA SP-2000-4517
Electric Hover Power simplified calculation ²
(A)
(B = 1/A)
(C)
(D = B / C)
(E)
(F = D x E)
Disc Loading
Lift Efficiency
UNIT
Electric Hover Power
kg/m²
kg/kW
Shaft Specific Power
Electric Power Train Efficiency %
Specific Electric Power
Aircraft weight
kW/kg
kW/kg
kg
kW
LILIUM
JET
1,150
1.7
0.59
87%
0.68
3,175
2,147
PROPELLER
eVTOL
-2x
60
3.6
0.28
87%
0.32
3,175
1,014
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