Principles of Flighteasy#551
Trailing edge flaps increase lift primarily by:
A
Increasing the critical angle of attack
B
Reducing induced drag
C
Increasing the camber and effective wing area, which increases CLmax
CorrectD
Reducing the wing's angle of attack
Explanation
Flaps increase wing camber and (with Fowler-type) wing area, raising CLmax and allowing slower flight.
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