The gear turning propeller has a telescopic function and can complete three different kinds of operation of driving, turning and lifting.
本实用新型的齿轮回转推进器具有伸缩功能，能够完成传动、回转、升降三个不同的操作。
2
Lifting surface method and non-linear vortex lattice method were used for the calculation of propeller and rudder with additional thrust fins respectively.
对螺旋桨与舵附推力鳍分别采用升力面法和非线性涡格法计算。
3
Inaccessible areas will be constructed as void Spaces. Eye pads will be provided on port and starboard for lifting rudder and propeller.