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The centre of pressure of an airfoil is the point at which

  • A.The airfoil has its maximum thickness
  • B.The boundary layer first becomes turbulent
  • C.The chord line meets the mean camber line
  • D.The resultant aerodynamic force may be taken to act

Answer: D

Placing the whole resultant force there produces the same moment as the real distributed loading, so no additional moment is needed. Its position moves with angle of attack, which makes it awkward as a reference point.

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