Discussion
Statement I: Roll control near the stall is often taken over by rudder and spoilers.
Statement II: A lowered aileron raises the local incidence on a wing already close to stalling.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. Lowering an aileron raises the local angle of attack on a wing already near the stall, so the down-going aileron can stall its own wing tip and produce a roll in the wrong direction - or a wing drop.
Rudder and spoilers avoid the problem: neither raises local incidence anywhere. Washout, stall strips and boundary layer fences are the complementary design measures, arranging for the root to stall before the tip so that aileron authority survives to the stall.
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