Discussion
Assertion (A): A yaw damper is fitted to almost every swept-wing transport.
Reason (R): Sweep raises the dihedral effect, which increases the roll content of the Dutch roll and worsens its damping ratio.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second explains the first. Sweep makes the rolling moment with sideslip strongly negative, because the advancing wing meets the flow more nearly square on, and that added roll response degrades Dutch roll damping at the same time as it helps the spiral. Combined with the fall in yaw damping at cruise altitude, the bare airframe cannot meet the requirement, so rate feedback to the rudder is provided as standard rather than as a refinement.
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