Discussion
A supercritical aerofoil differs from a conventional section principally in having
Answer: C
Flattening the crest keeps the local supersonic region at a modest Mach number over a long run, so the shock closing it is weak and both wave drag and shock-induced separation are reduced. The aft camber restores the lift that flattening the crest gave away, at the cost of a more nose-down pitching moment.
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