Page 129 - Aeronautical Engineer Data Book
P. 129
Basic aerodynamics 105
For downwash velocity (w):
K 0
w = , i.e. it is constant along the span.
4S
For induced drag (vortex):
2
C L
D =
D
V πAR
span 2 4s 2
where aspect ratio (AR) = =
area S
Hence, C falls (theoretically) to zero as aspect
D
V
ratio increases. At zero lift in symmetric flight,
= 0.
C D
V
