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Which term names the moment the pilot must overcome, as opposed to the moment the surface applies to the aeroplane?

  • A.Pitching moment
  • B.Control effectiveness
  • C.Manoeuvre margin
  • D.Hinge moment

Answer: D

The hinge moment is the one the pilot fights, about the surface's own hinge; the pitching moment is what the surface does to the aeroplane, about its centre of gravity. Control effectiveness is the derivative that quantifies the second. The manoeuvre margin is a stability property. Confusing the two moments is the single most common error on this topic, and the whole design art of balance depends on keeping them separate, since balance changes one and not the other.

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