Discussion
A supercritical aerofoil section delays drag divergence chiefly by
Answer: D
The relatively flat upper surface keeps the local supersonic flow at a modest Mach number over a long run, so the shock closing the pocket is weak and the wave drag and shock-induced separation are both reduced. It does not prevent supersonic flow; it manages it, and the aft camber recovers the lift lost from the flattened crest.
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