Helicopter Sizing by Statistics - Faculty of Aerospace Engineering
Helicopter Sizing by Statistics - Faculty of Aerospace Engineering
Helicopter Sizing by Statistics - Faculty of Aerospace Engineering
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Main Rotor Diameter (m)<br />
40<br />
30<br />
20<br />
10<br />
0<br />
AHS Forum 58, June 2002<br />
Main Rotor Diameter<br />
The " square− cube" scaling law:<br />
D ∝ W 13<br />
0<br />
D = f (W 0) )<br />
D = f (W (GW 0, Vm & V ) max<br />
Estimation<br />
0 10 20 30 40<br />
Main Rotor Diameter Estimation (m)<br />
Error (%)<br />
40<br />
30<br />
20<br />
10<br />
0<br />
7<br />
D = f ( W0)<br />
6<br />
30<br />
21<br />
Average error Max error<br />
D = 0.<br />
980 W 0. 308,<br />
0<br />
D W<br />
AVER ε MAX ε<br />
where is in [ m] and is in [ kg]<br />
( = 7%, = 30%, R = . 9606)<br />
D = 9 . 133 W0. 380 / V0.<br />
515<br />
m ,<br />
0<br />
Vm<br />
is in [ km / hr]<br />
S/ L<br />
AVER MAX<br />
ε ε R<br />
( = 6%, = 21%, = . 9744).<br />
0<br />
D = f ( W0, Vm) <strong>Faculty</strong> <strong>of</strong> <strong>Aerospace</strong> Eng., Technion - I.I.T.<br />
8
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