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Skin-friction drag on a modern subsonic transport typically accounts for roughly

  • A.None of the drag in cruise
  • B.Half the total drag in cruise
  • C.Five per cent of the total drag
  • D.Ninety-five per cent of the total drag

Answer: B

About half the cruise drag of a transport is skin friction, with most of the remainder being lift-induced. That split is why laminar flow control and riblets attract such sustained research attention despite the practical difficulties they present.

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