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Winglets are of limited value on a supersonic aircraft because

  • A.Induced drag is a small share of supersonic drag
  • B.They cannot be built strongly enough
  • C.They increase the wing's aspect ratio too much
  • D.They interfere with the trailing vortex system

Answer: A

Winglets attack induced drag, which dominates in slow flight but is a modest share of the total for a supersonic cruiser, where wave drag and friction lead. The added area and its own wave drag can easily outweigh the induced-drag saving, so the device does not transfer well to that regime.

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