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A diamond or double-wedge aerofoil in supersonic flow experiences wave drag that varies, for small angles, as

  • A.The squares of thickness ratio and incidence
  • B.The thickness ratio alone
  • C.The incidence alone
  • D.The inverse of the thickness ratio

Answer: A

Linearised supersonic theory splits the wave drag into a thickness contribution and a lift contribution, each entering as a square. This is why supersonic sections are made as thin as structure allows, and why cruising at low incidence matters so much for range.

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