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The lift of an airfoil in incompressible flow is NOT affected by

  • A.The angle of attack of the section
  • B.The camber of the section
  • C.The density of the air
  • D.The absolute static pressure of the free stream

Answer: D

Lift depends on the pressure DIFFERENCE around the section, not on the absolute level, so raising the ambient pressure while holding density and speed constant changes nothing. Angle, camber and density all enter directly.

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