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Hinge moments matter on a fully powered aeroplane because they

  • A.Size the actuators and the hydraulic supply
  • B.Determine the stick force directly
  • C.Set the aeroplane's static margin
  • D.Fix the maximum load factor

Answer: A

The actuator must overcome the hinge moment at the worst combination of deflection, incidence and dynamic pressure, so hinge moment estimation sizes the jack and the hydraulic power. Stick force comes from the feel unit instead, which is the whole point of a powered system. Static margin is a whole-aeroplane property. Load factor limits come from the structure and the flight envelope, not from a hinge.

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