# Dutch Roll:
Dutch roll is an aircraft motion that is identified by a combination of a continuous back and forth rolling and yawing motion.
In general, a Dutch roll is considered to be dynamically stable, meaning that the oscillations tend to decrease in amplitude. Most large airliners have a yaw damper installed that can artificially increase stability.
Aircraft that have wings placed above the center of mass, dihedral wings and swept wings tend to increase the roll restoring force, therefore increase the tendency of the aircraft to initiate a Dutch roll. This is the reason why high-winged aircraft are often slightly anhedral, and swept wing aircraft rely on the operation of the yaw damper.
How it occurs:
In aircraft design, relatively weaker positive directional stability as opposed to positive lateral stability can result in a Dutch roll. Rolling the aircraft around the longitudinal axis means that a sideslip is introduced into the relative wind in the direction of the rolling motion.
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Table of Contents:
- What Is Dutch Roll?
- How Does Dutch Roll Occurs?
- Stronger Roll Stability
- Weaker Yaw Stability