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Flight tests show that holding 8 degrees of steady sideslip requires 5 degrees of aileron held into the slip.

What does this measure?

  • A.The aeroplane's directional stability
  • B.The aileron's hinge moment
  • C.The strength of the dihedral effect
  • D.The rudder's control power

Answer: C

The dihedral effect rolls the aeroplane away from the sideslip and the aileron must resist it. The ratio of aileron to sideslip is therefore a direct flight test measure of how strong that rolling response actually is.

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