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A supersonic leading edge is one that

  • A.Cannot generate any lift
  • B.Occurs only below Mach one
  • C.Lies ahead of the Mach cone
  • D.Is always unswept

Answer: C

If the edge is not swept far enough to hide inside the Mach cone, the flow meets it supersonically and an attached shock forms along it. Such an edge must be sharp, and it recovers no leading-edge suction, so the drag due to lift is higher than for a subsonic edge.

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