The theoretical calculation method about how to predict the hydrodynamic characteristics of ichthyoid rudder is proposed in this paper 本文提出了一种鱼形舵定常升力的水动力性能预报的理论预报方法。
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In addition , the data needed to survey and the equation concerned is given . the elements that affect the hydrodynamic characteristics of ichthyoid rudder are analyzed 在试验设计部分，给出了鱼形舵敞水试验的具体思路，有关设备、装置，需要测量的主要数据，处理数据所要用到的主要公式等。
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In the first part , the steady nonlinear vortex lattice method is adopted to calculate the hydrodynamic characteristics of open water ichthyoid rudder , and the induced velocity of ichthyoid rudder is calculated using panel method 本文理论计算部分，采用定常非线性涡格法计算鱼形舵的水动力性能，用面元方法计算舵流场的诱导速度。
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The results of the lift interference are given here as a result of a series of rudder of different aspect ration fitted to different location of the fornication . in the second part , the device of open water experiment of ichthyoid rudder is present 提出了一个估算鱼形舵定常升力的方法，计算了一系列不同展弦比、不同翼型、不同位置分叉点及尾缘剖分角对鱼形舵影响下的升力。
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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 其研究的鱼形舵是一个没有在水下移动的鱼尾形剖面单片结构，增加了全舵的剖面拱度，使螺旋桨尾流的折射水量增强，进而增大了水动力的作用，使之比普通流线形舵的升力提高30左右。
