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A ventral fin beneath the rear fuselage

  • A.Replaces the rudder
  • B.Adds stability at high angle of attack
  • C.Reduces directional stability
  • D.Acts only on the ground

Answer: B

It remains in relatively clean air when the main fin is blanketed at high incidence. The penalty is ground clearance, which is why such fins are often made to fold or are confined to aeroplanes with long undercarriages.

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