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Which best summarises why wing design differs so sharply between the subsonic and supersonic regimes?

  • A.Skin friction behaves differently above Mach one
  • B.Lift cannot be generated supersonically
  • C.The air becomes viscous only above Mach one
  • D.Induced drag rewards span, wave drag rewards sweep

Answer: D

The whole tension of the subject lies in that one sentence. A long wing is cheap in induced drag but expensive in wave drag; a slender swept wing is the reverse. Every planform from the sailplane to the delta is a position taken on that trade, and variable sweep was an attempt to avoid taking one.

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