Discussion
Compared with a plain flap, a Fowler flap increases lift additionally by
Answer: D
Correct answer: Increasing the wing area as it extends rearwards
A plain flap only adds camber by deflecting the trailing edge. A Fowler flap translates aft on tracks as it deflects, so it adds camber and enlarges the reference area at the same time - and since lift is proportional to area, that second effect is substantial. It is why Fowler flaps give the largest lift increment of the common trailing edge devices.
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