Discussion
A wing carries \( 2.5 \) degrees of washout with a root incidence of \( 3 \) degrees. The tip incidence is
Answer: A
Correct answer: 0.5 degrees
Washout is a reduction of incidence from root to tip:
\[ 3.0 - 2.5 = 0.5^\circ \]The tip therefore flies at a lower angle of attack than the root and reaches its stalling angle later, so the root stalls first. That preserves aileron authority into the stall and gives a nose-down pitching moment rather than a wing drop, which is what makes the stall benign.
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