船用螺旋桨是一类典型的自由曲面零件，它的设计和制造精度直接决定了其推进效率。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
气垫船动力系统增加了为气垫供气用的垫升风机，同时采用空气螺旋桨推进，整个动力系统设计复杂。
With lift fans for air supply and aerial propellers in propulsion simultaneity, the whole power system of Air-Cushion Vehicle becomes more complicated.
船舶推进器已经被研究了很长时间，船用螺旋桨是船舶最重要的推进器。但是，直到现在，船用螺旋桨的设计和绘制仍然是很困难的。
The design and drawing of ship screws is being studied for long time and the propeller is the most important ship impeller.
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