Induced Downwash in Manoeuvre
The simplest loading that will contribute to roll is mode 2, which is antisymmetric and does not contribute to lift as any mode An, n > 2. The mode 2 circulation and induced downwash are given by
r2[y(t)] = 2UbA2 sin2t sin 2t
wW2 [y (t)] = —2U A2 = —4U A2 cos t
Given that y(t) = -| cos t, 0 < t < n, the last relation reads
Ww2 (У) = 8UA2
This is represented in Fig. 15.24.
220.127.116.11 Induced Drag in Manoeuvre
The induced drag is given by
ideal ^1 + 2 ^^ = (CDt)ideal ^1 +
The increase in induced drag is 2%.
Fig. 15.24 Mode 2 loading for manoeuvre