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A bobweight in the control run is fitted to

  • A.Reduce the hinge moment at high speed
  • B.Prevent control surface flutter
  • C.Provide artificial feel in a powered system
  • D.Increase the stick force per g

Answer: D

A bobweight is a mass that responds to normal acceleration, so it adds a force proportional to g and raises the stick force per g without affecting the force at one g in level flight. It is the classic fix for an aeroplane whose manoeuvre forces are too light. It does nothing about the speed dependence of hinge moments. Flutter is prevented by mass balancing at the surface, which is a different weight in a different place. Artificial feel units are separate devices.

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