Dutch Roll is defined as which phenomenon?

Dutch Roll is defined as which phenomenon?

• A. The tendency of the aircraft to yaw when it rolls.
• B. The tendency of the aircraft to roll whenever it yaws.
• C. A three-dimensional oscillation of the wing during gusts.
• D. A coordinated turning maneuver.

Answer: (B)

Dutch roll is a lateral-directional oscillation where yaw and roll are tightly coupled. When the aircraft yaws, it tends to roll, and this rolling motion then reinforces the yaw, creating a characteristic side-to-side, back-and-forth motion. This happens because the aircraft’s lateral stability characteristics—such as dihedral and the interaction with the vertical tail—convert a yaw motion into a rolling moment. That’s why the description “the tendency of the aircraft to roll whenever it yaws” is the best fit. It directly captures the coupled behavior at the heart of Dutch roll. If we described yaw occurring because the plane rolls, or treated it as a simple gust-induced wing oscillation or a coordinated turning maneuver, we’d be describing a different phenomenon or an intentional action, not this stability-related coupling.

Dutch roll is a lateral-directional oscillation where yaw and roll are tightly coupled. When the aircraft yaws, it tends to roll, and this rolling motion then reinforces the yaw, creating a characteristic side-to-side, back-and-forth motion. This happens because the aircraft’s lateral stability characteristics—such as dihedral and the interaction with the vertical tail—convert a yaw motion into a rolling moment.

That’s why the description “the tendency of the aircraft to roll whenever it yaws” is the best fit. It directly captures the coupled behavior at the heart of Dutch roll. If we described yaw occurring because the plane rolls, or treated it as a simple gust-induced wing oscillation or a coordinated turning maneuver, we’d be describing a different phenomenon or an intentional action, not this stability-related coupling.