Discussion
Inboard ailerons are fitted on many large transports to
Answer: B
Correct answer: Avoid the wing twist that causes reversal at high speed
An inboard aileron applies its load near the wing root, where the structure is deep and torsionally stiff and the moment arm to the torsion box is short. Very little twist results, so the aileron's own lift change is not cancelled.
An outboard aileron works at the flexible tip, where the same load twists the wing appreciably. Large transports therefore use outboard ailerons at low speed for their long moment arm, and lock them out at high speed, rolling on inboard ailerons and spoilers instead.
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