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A wing's leading edge is described as subsonic when

  • A.The section is symmetric
  • B.It lies behind the Mach cone from the apex
  • C.The whole aircraft is flying below Mach one
  • D.The trailing edge is unswept

Answer: B

What matters is the velocity component normal to the leading edge. If the edge is swept far enough to lie inside the Mach cone, that component is below sonic speed and the edge behaves in a subsonic manner, permitting a rounded nose and leading-edge suction even though the aircraft is supersonic.

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