The accelerations of spiral maneuver and cycloid maneuver can be expressed by their components in the pitch plane and the yaw plane.

螺旋机动和摆式机动的加速度可以用纵向和航向平面内的加速度分量来表示。

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Investigators say the weight, wind factors, an ineffective pilot maneuver in response to an onboard alarm and a subsequent surprise yaw caused the aircraft to spin out of control.

WSJ: Feds: Overloading, pilot error downed NY copter