![]() Strong lateral stability (due to the more-direct airflow past the down wing, which has been pivoted forward by the slip) begins to restore the aircraft to level flight. When an aircraft rolls around the longitudinal axis, a sideslip is introduced into the relative wind in the direction of the rolling motion (due to the lateral component of lift when the wings are not level). In aircraft design, Dutch roll results from relatively weaker positive directional stability as opposed to positive lateral stability. A similar phenomenon can happen in a trailer pulled by a car. Wings placed well above the center of gravity, sweepback ( swept wings) and dihedral wings tend to increase the roll restoring force, and therefore increase the Dutch roll tendencies this is why high-winged aircraft often are slightly anhedral, and transport-category swept-wing aircraft are equipped with yaw dampers. ![]() Dutch roll stability can be artificially increased by the installation of a yaw damper. This motion is normally well damped in most light aircraft, though some aircraft with well-damped Dutch roll modes can experience a degradation in damping as airspeed decreases and altitude increases. ![]() ![]() This yaw-roll coupling is one of the basic flight dynamic modes (others include phugoid, short period, and spiral divergence). Air Force flight manual.ĭutch roll is a type of aircraft motion consisting of an out-of- phase combination of "tail-wagging" (yaw) and rocking from side to side (roll). Dutch roll damping technique, scanned from U.S. ![]()
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