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Lift on an airfoil arises physically from

  • A.The thrust component acting along the chord
  • B.The friction of the air on the upper surface
  • C.The integrated pressure difference between the surfaces
  • D.The weight of air displaced beneath the wing

Answer: C

Integrating the pressure distribution around the section, with a small contribution from shear, gives the resultant force whose component perpendicular to the flow is lift. Friction contributes almost entirely to drag rather than to lift.

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