Discussion
Assertion (A): Roll control near the stall is often left to rudder and spoilers.
Reason (R): A lowered aileron increases the local angle of attack on a wing already close to stalling.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the reason for the first. Lowering an aileron raises the local angle of attack, and on a wing already near the stall that section may stall - producing a roll opposite to the one commanded, or dropping the wing further.
Rudder and spoilers avoid the difficulty because neither raises incidence anywhere. The complementary design measures are washout, stall strips and fences, arranging for the root to stall before the tip so that some aileron authority survives to the stall.
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