Discussion
Assertion (A): Spoilers are attractive as roll controls on large transports.
Reason (R): They produce favourable yaw and avoid the wing twist that causes aileron reversal.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives both of the attractions. Spoilers add drag on the descending wing, inside the turn, so the yaw they produce is favourable rather than adverse and no coordinating rudder is needed.
And they generate a rolling moment by destroying lift rather than by loading the section aft, so they impose no twisting moment on the wing and are immune to the reversal that limits outboard ailerons. Both properties matter most on a large flexible wing, which is exactly where they are used.
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