# Jet damping

The jet damping contributes to the pitch and yaw damping coefficients, $Cm_q$ and $Cn_r$, where $Cm_q$ is the rate of change of pitching moment with respect to pitch rate and $Cn_r$ is the rate of change of the yawing moment with respect to yaw rate. For jet airplanes in cruise, the contribution of jet damping is usually negligible because the external aerodynamic damping is large relative to the jet damping. Rockets at lift-off, however, have practically zero external aerodynamic damping and the jet damping becomes significant.[2]