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Winglets are fitted to a transport wing mainly to

  • A.Improve the aircraft's stalling behaviour
  • B.Raise effective span within the gate box
  • C.Reduce skin-friction drag
  • D.Increase the wing's thickness

Answer: B

The winglet displaces and diffuses the tip vortex so the wing behaves as though longer, and it does so within the span limit an airport imposes. The added wetted area costs friction drag, so the device pays only where induced drag is a large share.

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