Discussion
At high lift coefficient the dihedral effect of a swept wing
Answer: B
The sweep contribution to the rolling moment with sideslip is proportional to the lift coefficient, so it grows as the aeroplane slows and the lift coefficient rises. That is why a swept-wing aeroplane's Dutch roll is at its worst on approach, where the mode is both slow and roll-dominated, and why the yaw damper is required for landing on many types. Geometric dihedral is indeed a fixed contribution, but sweep is not, which is the point. Nothing here reverses the sign.
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