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A swept wing contributes to directional stability by

  • A.Producing a rolling moment only
  • B.Having no directional effect at all
  • C.Yawing moment from differential drag
  • D.Reducing the fin's effectiveness

Answer: C

In sideslip the forward wing meets the flow at a lower effective sweep and generates more drag, yawing the nose back. The effect is modest compared with the fin but adds usefully to the total on a swept wing aeroplane.

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