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The neutral point is the centre of gravity position at which

  • A.The aeroplane produces maximum lift
  • B.The elevator becomes ineffective
  • C.The aerodynamic centre coincides with the nose
  • D.The pitching moment curve has zero slope

Answer: D

Moving the centre of gravity aft to that point removes the stabilising slope entirely, leaving the aeroplane neutrally stable. Any further aft movement makes it statically unstable, which is why the neutral point defines the aft limit.

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