Discussion
Statement I: A swept wing adds usefully to directional stability.
Statement II: In sideslip the forward wing meets the flow at a lower effective sweep and produces more drag.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. In sideslip the forward wing meets the airflow at a lower effective sweep angle than the rear one, so it presents a greater effective span and frontal area to the flow and generates more drag.
That drag differential, acting at a distance from the centre of gravity, produces a yawing moment towards the relative wind - a stabilising contribution. It is modest compared with the fin's but it is genuinely useful, and it grows with sweep and with lift coefficient. The same sideslip on a swept wing also produces a strong rolling moment, which is why sweep contributes an effective dihedral as well.
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