Discussion
Assertion (A): A swept wing aeroplane feels more strongly stable in roll on the approach than in cruise.
Reason (R): The sweep contribution to the dihedral effect grows with lift coefficient.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the mechanism. Sweep's dihedral effect works through the lift difference between the forward and rear wings in a sideslip, and that difference scales with the lift coefficient at which the wing is working.
On the approach the lift coefficient is high, so the contribution is at its largest and the aeroplane feels stiffer in roll. In cruise it is much reduced. That variation across the envelope is why a swept-wing aeroplane's Dutch roll is worst at low speed and why yaw dampers matter most there.
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