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What does the hinge moment coefficient depend on most strongly?

  • A.Surface deflection and local incidence
  • B.Aeroplane weight and altitude
  • C.Fuel state
  • D.The number of hinges fitted

Answer: A

The coefficient is a function of the flow over the surface, so deflection and local incidence dominate, with Mach number and any tab position as further arguments. Weight and altitude affect the flight condition and therefore the dynamic pressure, which multiplies the coefficient rather than setting it. Fuel state is a mass matter. The number of hinges is a structural detail with no aerodynamic significance at all.

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