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Laminar flow aerofoils achieve low drag by

  • A.Increasing the thickness ratio
  • B.Forcing early transition
  • C.Holding a favourable gradient over much of the chord
  • D.Roughening the leading edge

Answer: C

Moving the point of maximum thickness aft keeps the flow accelerating over much of the surface, and that favourable gradient suppresses the instabilities that would otherwise trigger transition. The saving is real but fragile, since insects, rain or manufacturing waviness can destroy it.

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