Compared to an ordinary rudder , the value of lift coefficient of ichthyoid rudder is about 30 % higher and the maximum rudder angle of it nearly reaches 45 degrees . ichthyoid rudder is a design under such a conception as to effectively utilize the propellers slipstream for rudder action , and featured by having a fish - shaped one - piece construction that is to say - no part of ichthyoid rudder can move in the water 其研究的魚(yú)形舵是一個(gè)沒(méi)有在水下移動(dòng)的魚(yú)尾形剖面單片結(jié)構(gòu),增加了全舵的剖面拱度,使螺旋槳尾流的折射水量增強(qiáng),進(jìn)而增大了水動(dòng)力的作用,使之比普通流線形舵的升力提高30左右。