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A supercritical aerofoil is selected for a transonic transport because it

  • A.Reduces skin friction drag
  • B.Increases the section's thickness ratio
  • C.It weakens the shock, delaying drag rise
  • D.Prevents supersonic flow forming at all

Answer: C

The flattened upper surface keeps the local Mach number modest over a long run, so the terminating shock is weak. Aft camber recovers the lift the flattened crest gives away, at the cost of a more nose-down pitching moment.

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