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Sweeping a wing raises the drag-divergence Mach number because

  • A.Only the velocity component normal to the leading edge governs the section behaviour
  • B.Sweep increases the wing's aspect ratio
  • C.Sweep reduces the skin-friction drag
  • D.Sweep eliminates the boundary layer entirely

Answer: A

To a first approximation the section responds to the component of the free stream normal to the leading edge, which is smaller than the free-stream speed by the cosine of the sweep angle. The section therefore behaves as though it were flying more slowly, and the onset of local supersonic flow is delayed.

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