Discussion
A Fowler flap differs from a plain flap in that it
Answer: C
Correct answer: It extends aft, adding area and camber
A Fowler flap runs aft on tracks as it deflects, so the wing gains planform area as well as camber - and since lift is proportional to area, the gain is large, giving increments in maximum lift coefficient well beyond what camber alone achieves. A plain flap merely hinges down, adding camber at constant area. The Fowler pays for its performance in track and carriage complexity, and it certainly increases drag.
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