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For static directional stability the yawing moment derivative with sideslip must be

  • A.Equal to the rolling moment derivative
  • B.Positive
  • C.Negative
  • D.Zero

Answer: B

The sign convention makes a positive derivative the stable one, with a right sideslip producing a yawing moment to the right. That moment turns the nose into the relative wind and removes the sideslip that produced it.

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