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.
密封性是全回转推进器水下安装最重要的条件，针对不同形式的全回转推进器基座，其密封形式也有很大差别。
Tightness is the most important foumdation of azimuth thruster' underwater installation, regarding different types of azimuth thrus'ter foundation, the types of sealing are different.
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