虽然极寒，而在点火后此燃料可以产生炽热的蒸汽(5000度)和足够的推力：氢比其它推进器燃料的效率高出40%。
Though the fuels are frosty, upon ignition they generate scorching steam (5, 000 degrees) and plenty of thrust: Hydrogen is 40 percent more efficient than other propellants.
通常螺旋推进器最大效率为75％，其余的能量以漩涡的形式损失。
Usually, the fullest efficiency of screw propeller is 75% with the rest energy lost in the way of whirlpool.
但其排气速度却异常惊人，大约为化学燃料火箭的十倍—这使得离子推进器的效率非常高。
The exhaust velocity, though, is enormous—more than ten times that of a chemical rocket—and this makes ion propulsion extremely efficient.
它们使用的操纵和控制系统大多是由多个螺旋桨推进器组成的，这样的系统体积大、重量大、能耗高、综合效率低，并有较大的噪音和尾涡。
Their maneuvering and control systems are made up of several propellers. This system has many disadvantages such as big volume, high consuming of energy, low total efficiency , high noise and vortex.
仿鱼鳍水下推进器作为一种具有效率高、运动灵活以及噪音低等优点的新型水下推进器越来越受到广大科技工作者的重视。
A new type of underwater turbine has been paid more and more attention for its high efficiency, maneuverability and low noise.
仿鱼鳍水下推进器作为一种具有效率高、运动灵活以及噪音低等优点的新型水下推进器越来越受到广大科技工作者的重视。
A new type of underwater turbine has been paid more and more attention for its high efficiency, maneuverability and low noise.
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