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A delta wing at high angle of attack derives a large part of its lift from

  • A.A fully attached boundary layer over the entire upper surface
  • B.Shock waves standing ahead of the leading edge
  • C.The trailing vortex sheet acting on the lower surface
  • D.Leading-edge vortices that create suction on the upper surface

Answer: D

The sharp, highly swept leading edge forces separation into a pair of strong, stable vortices lying over the upper surface. The intense low pressure under those vortex cores gives extra lift that grows nonlinearly with incidence. The mechanism lets slender delta wings reach very high angles of attack without a conventional stall.

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