Discussion
Consider the following statements about a supercritical aerofoil:
1. Its upper surface is relatively flat over the forward part of the chord.
2. It carries pronounced aft camber.
3. It prevents any supersonic flow from forming on the surface.
Which of the statements given above is or are correct?
Answer: C
The first two describe the shape correctly, the aft camber recovering the lift the flattened crest gave away. The third is false: the section does not prevent supersonic flow but keeps it at a modest Mach number so the terminating shock stays weak.
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