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Which statement about the neutral point is false?

  • A.It gives zero pitching moment slope
  • B.It defines the aft centre of gravity limit
  • C.The static margin is zero there
  • D.It is the point through which the lift always acts

Answer: D

Correct answer: It is the point through which the lift always acts

That is the false one. The neutral point is the aerodynamic centre of the whole aeroplane: the point about which the pitching moment does not change with incidence, which means it is the point through which the *increment* of lift acts. The total lift acts through the centre of pressure, which moves with incidence. The other three statements are all correct restatements of the definition.

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