可変ピッチプロペラ船のピッチ逓減時の舵力について

概要

論文の詳細を見る
A ship equipped with controllable pitch propeller (CPP) is superior in her stopping ability. But, when she is going to stopping or reducing her speed, her manoeuvrability is inferior to ships with fixed pitch propeller (FPP). We think the difference is due to the inflow velocity to the rudder. So we had investigated the normal force of rudder behind CPP at a circulating water channel. And the results are given as follows. 1) On a CPP ship, decreasing his pitch, Negative slip ratio area comes out and the rudder behind the CPP will perform in a lower velocity field than propeller advancing speed. So the normal force of rudder is smaller than a FPP ship's. Especially, when the blade angle is equal to zero, the rudder force is almost equal to zero, 2) We got a experimental formula to calculate mean inflow velocity of rudder for a wide slip ratio area. We suppose that mean inflow velocity of rudder for any slip ratio can be calculated from general momental theory, and the amend-mental coefficient K of the theoretical equation should be shown as a quadratic equation of slip ratio.
公益社団法人日本航海学会の論文
1979-02-20