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As the angle of attack of a cambered airfoil is reduced towards the zero-lift angle, the centre of pressure

  • A.Moves rearward, tending towards infinity
  • B.Moves steadily forward to the leading edge
  • C.Remains fixed at the quarter chord point
  • D.Moves to the trailing edge and stops there

Answer: A

With lift approaching zero but a residual pitching moment remaining, the point at which the force would have to act recedes without limit. This awkward behaviour is precisely why the aerodynamic centre is preferred as a reference.

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