We 've managed to achieve propulsion through hand-powered propellers .
我们已经成功地研制出了手动推进器。
Hb-sia uses four electric motors turning propellers .
hb-sia使用四台电机驱动螺旋浆。
The engines used by ark angel are electric motors driving counter-rotating propellers , mounted in pods below the hull .
方舟天使使用的引擎是反向旋转的螺旋桨驱动的电动马达，安装在船体下的分离舱中。
These are similar to the azimuth thrusters already used on some vessels : propellers on pods that can be rotated to push the ship in different directions , making a rudder unnecessary .
