Discussion
Aileron reversal at high speed occurs when
Answer: A
Correct answer: Wing twist overcomes the aileron
A down-going aileron produces its lift well aft on the section, which twists the wing leading-edge-down. That twist reduces the wing's own angle of attack, and the lift it loses opposes the lift the aileron gained.
Both effects grow with dynamic pressure, but the twist grows faster because the wing's torsional stiffness is fixed. Above the reversal speed the twist wins outright and the aeroplane rolls the wrong way. The remedy is stiffness or geometry - inboard ailerons and spoilers - not a change to the control run, which is correctly rigged throughout.
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