This avoids the use of a traditional propeller shaft and puts the propellers in a clear flow of water, which greatly improves efficiency.
这样就避免了使用传统的螺旋轴，将螺旋桨置于干净的水流中，从而大大提高了效率。
Usually, the fullest efficiency of screw propeller is 75% with the rest energy lost in the way of whirlpool.
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。
Some pumps used for 1000 hours, the ship propeller in the use of time is also greatly reduced because of the efficiency of air piping.
某些水泵使用1000小时左右即出现严重的空蚀，船舶螺旋桨在使用一段时间后也因空蚀而效率大大降低。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
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。
The test results indicated that the variation of the spacing between propeller and rudder bulb has obvious effect on propeller open water efficiency.
试验结果表明，桨、舵球间距的变化对螺旋桨敞水效率的影响是明显的。
The advantage of the ducted propeller is, this type propeller can support greater thrust and higher efficiency under low speed, so is the first choice.
导管螺旋桨优势在于低航速时提供更大的推力和更高的推进效率，因此作为首要选择。
The boss vortex cavitation of propeller can be avoided by PBCF, and an increase of 2% in propulsion efficiency has been measured in the model tests.
桨毂帽鳍可改善毂涡空泡，模型试验状态下可提高推进效率2%左右。
This new principle is of great significance for analysing fish's swimming and designing high efficiency propeller.
这一新型原理对分析鱼类游泳及设计高效推进器具有重大意义。
The propeller is not only favorable to enhance the efficiency of marine propulsion systems, but also can generate large pushing force.
该螺旋桨不仅有利于提高船舶推进系统的效率，而且能产生较大推力。
The propeller is not only favorable to enhance the efficiency of marine propulsion systems, but also can generate large pushing force.
该螺旋桨不仅有利于提高船舶推进系统的效率，而且能产生较大推力。
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