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The aerodynamic centre of a wing is the point about which

  • A.The lift acts at all angles of attack
  • B.The wing rotates in flight
  • C.The drag acts
  • D.The pitching moment coefficient is independent of angle of attack

Answer: D

Locating it near the quarter chord for a subsonic aerofoil simplifies the whole analysis, since the moment about that point can be treated as constant. The centre of pressure by contrast moves with angle of attack and is far less convenient.

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