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A supersonic aerofoil is given a sharp leading edge chiefly to

  • A.Keep the bow shock attached and weak
  • B.Increase the maximum lift coefficient
  • C.Delay boundary-layer transition
  • D.Reduce the skin-friction drag

Answer: A

A sharp edge asks only a small deflection, which an attached weak oblique shock can supply, so the wave drag is small. A rounded edge would force a detached bow shock with a strong nearly normal portion ahead of it and a heavy drag penalty at supersonic speed.

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