The period of the Dutch roll in flight mechanics is a measure of the time it takes for an aircraft to complete one full oscillation or cycle of a lateral and directional stability mode known as the “Dutch roll.” This oscillatory motion is characterized by alternating sideslip and roll motions, where the aircraft rolls to one side, then the other, with a simultaneous yawing motion.
The period of the Dutch roll=2Ï€/Damping ratio