当飞机垂直起飞时，飞马发动机前后四个喷管转到垂直向下的位置，在喷气反作用力的作用下产生向上的推力，使飞机垂直上升；
When the plane tries to take off vertically, the Pegasus engine's four jettube will turned to face the ground so that the whiff will raise the aircraft.
最后一步是将蒸汽引入气缸，使得活塞前后推动，从而提高了发动机的速度，降低了燃料消耗。
The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing the speed of the engine and cutting its fuel consumption.
在一些滑翔器里小型电力发动机也可以前后推动电池来调整倾斜角度。
In some gliders small electric motors also slide the batteries backwards and forwards to adjust the pitch.
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