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The adverse pressure gradient on the upper surface of an airfoil is steepest at

  • A.Zero angle of attack
  • B.Negative angles of attack only
  • C.The zero-lift angle of attack
  • D.High angles of attack

Answer: D

Raising the incidence sharpens the suction peak, so the pressure must recover over the same distance from a lower value. The gradient therefore steepens and separation moves forward, which is what limits the maximum lift coefficient.

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