Discussion
Reflex camber near the trailing edge is used chiefly on
Answer: A
Correct answer: Tailless aircraft, to reduce the nose-down moment
A cambered section has a nose-down pitching moment which, on a conventional aircraft, is balanced by the tailplane. A tailless design has no tail to do it, so the trailing edge is reflexed upward, loading the rear of the section in the opposite sense and bringing the moment coefficient near zero. It costs some maximum lift, which is the price of dispensing with the tail.
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