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Which of the following is not a fixed surface added for directional stability?

  • A.A forebody strake
  • B.The rudder
  • C.A dorsal fin
  • D.A ventral fin

Answer: B

The other three are fixed area improving the yawing moment derivative. The rudder is a movable control surface whose purpose is directional control rather than stability, and the two requirements are sized quite separately.

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