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All of the following raise the maximum lift coefficient of a section EXCEPT

  • A.Deploying a trailing edge flap
  • B.Extending a leading edge slat
  • C.Adding vortex generators ahead of the separation point
  • D.Increasing the surface roughness near the leading edge

Answer: D

Roughness at the leading edge trips the flow and promotes early separation, cutting the maximum coefficient, which is why icing and insect contamination matter so much. The other three are all recognised high-lift measures.

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