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A downspring in the elevator circuit is used to

  • A.Improve the stick force gradient with speed
  • B.Increase the stick force per g
  • C.Balance the elevator about its hinge
  • D.Limit the maximum elevator deflection

Answer: A

A downspring applies a nearly constant nose-down moment, so it steepens the variation of stick force with speed and can rescue an aeroplane whose speed stability gradient is too shallow, typically one loaded well aft. Because its force is constant it does not change the force per g, which is the bobweight's job. Balancing about the hinge is achieved by mass or aerodynamic balance. Deflection limits come from stops.

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