Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer.
In order to decrease the system Inveracious Alarm, the alarm restraining can be done when the driver turn about, loose accelerograph and apply the brake.
The airship establishes the returns posture immediately, the returns cabin and the advancement cabin separates, the retrofire, starts from the outer space to the earth's surface returns.
Besides the property of the asynchronous motor,the taper asynchronous motor can daff the detent easily,because magnetic force is generated when stator three-phrase windings connect to the electricity.