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Discussion

NACA six-series aerofoils were developed principally to

  • A.Improve behaviour at supersonic speed
  • B.Extend the run of laminar flow
  • C.Increase the maximum lift coefficient
  • D.Reduce the section's thickness

Answer: B

Moving the point of maximum thickness aft holds a favourable pressure gradient over much of the chord, delaying transition. The low-drag benefit is confined to a narrow band of lift coefficient and is fragile in service.

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