The thrust characteristics of axis symmetry nozzle were mainly measured in test. For the nozzle having a vectoring angle, the deflectionefficiency was measured too.
The merits of gravitational tractor in asteroid deflections are its high reliability and independence of asteroid characteristics, and the demerit is its low deflectionefficiency.
在小行星牵引任务中，引力拖车方法的优点是不依赖小行星特性、可靠性高，缺点是偏移能力有限。
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Meanwhile, such parameters as diffraction efficiency, deflection Angle and driving power of device have been analyzed and computed theoretically.