可変ピッチプロペラの設計難易度について

抄録

In this paper, the difficulty index in design of CPP is proposed as“ (PN²) ^2/5”. This index is derived from the principle of similarity and may serve as a common scale among designers of engine plant and hull and shipowners to judge the reliability of CPPs.
The upper limit of this index in the present situation can be introduced from the reference list of each CPP maker in the world and various model test results. As CPPs for high speed vessels are sensitive to wake distribution behind hull with regard to fluctuating load on blades and cavitation, it is noticeable that the allowable upper limit of these vessels is especially restricted.
Some method to push up this limit line is proposed, but in any case it is very important that the CPP dimensions are chosen to be kept good relation to hull dimensions.