spade rudder
... sonar声纳 spade rudder悬挂舵 spectacle frame眼睛型骨架 ...
[船] underhung rudder
... 穿心舵轴平衡舵 balanced rudder with axle 悬挂舵 underhung rudder 半悬挂舵 partially underhung rudder ...
partially underhung rudder ; semi-spade rudder ; Half-hanging of rudder ; Semi-suspension rudder
悬挂舵