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The chief reason a supersonic transport has proved economically difficult is

  • A.The absence of suitable engines
  • B.The inability to keep the leading edge subsonic
  • C.Its low cruise lift-to-drag ratio
  • D.The impossibility of building a wing strong enough

Answer: C

Wave drag and the poor lifting efficiency of a thin, slender wing together halve the lift-to-drag ratio relative to a subsonic transport, and fuel burn per seat-mile follows directly. The engineering was demonstrated decades ago; it is the economics, along with the sonic boom overland, that has proved intractable.

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