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.
一般用空载速度、最大推进力、效率及其他一些参数来表征压电线性马达。
In general, the piezoelectric linear motor is defined by no load velocity, the maximum thrust force, efficiency and other parameters.
这些因素必须迅速加以调整以确保最大的推进效率。
These factors must be adjusted rapidly to ensure maximum propulsive efficiency.
这些因素必须迅速加以调整以确保最大的推进效率。
These factors must be adjusted rapidly to ensure maximum propulsive efficiency.
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