direct-drive propeller

And it also should be defined that the diameter of a propeller is the leading parameter when the blade of propeller is partly above of the surface of water.

同时指出了在大风浪中航行,桨叶偶尔露出水面特殊工况时,其标志性变量应是:螺旋桨直径参数。

And it also should be defined that the diameter of a propeller is the leading parameter when the blade of propeller is partly above the surface of water.

同时指出了在大风浪中航行桨叶偶尔露出水面这一特殊工况时，其中标志性变量应是螺旋桨直径参数。