Discussion
Differential ailerons reduce adverse yaw by
Answer: A
Correct answer: Deflecting further up than down
Differential ailerons are rigged so that the up-going surface travels further than the down-going one. The larger upward deflection adds profile drag on the rising wing, while the smaller downward deflection limits the induced drag added on the other side.
The two changes together reduce the drag differential that causes adverse yaw. The mechanism is purely geometric, arranged in the control linkage, which makes it a cheap fix - and it costs a little roll authority, since the down-going aileron does less than it might.
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