Discussion
Assertion (A): Anhedral is sometimes fitted to an aeroplane with a heavily swept wing.
Reason (R): Sweep supplies a large dihedral effect of its own, and an excess of it degrades Dutch roll damping.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason. Sweep produces a strong rolling moment with sideslip because the advancing wing meets the flow more nearly square on, and on a heavily swept wing that effect alone can exceed what is wanted. Geometric anhedral subtracts from it, trading a little spiral stability for a better damped Dutch roll. It is why so many swept-wing military transports carry visible anhedral while straight-wing light aeroplanes carry dihedral.
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