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Hinge moment is proportional to which power of true airspeed?

  • A.The square
  • B.The first power
  • C.The cube
  • D.It is independent of speed

Answer: A

Hinge moment carries dynamic pressure, so it goes with the square of the speed at a fixed coefficient: doubling speed quadruples the force. That single fact explains aerodynamic balance, tabs of every kind, and ultimately powered controls. A linear dependence would have made manual controls viable to much higher speeds. A cube law belongs to power rather than force. And independence of speed is the behaviour of an artificial feel unit that has not been scheduled with q.

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