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A dorsal fin extends the fin forward along the top of the fuselage in order to

  • A.Maintain directional stability at large sideslip angles
  • B.Reduce the fin's area requirement in cruise
  • C.Increase the rudder's effectiveness at low speed
  • D.Improve the aeroplane's appearance

Answer: A

The main fin can stall at large sideslip, at which point its restoring moment collapses. The dorsal extension has a very low aspect ratio and keeps working to much larger angles, filling in exactly the region where the fin gives up.

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