可変ピッチプロペラ船の操縦性能について I : CPP船とFPP船の比較

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  • Maneuverability of the Ship equipped with Controllable Pitch Propeller I : Comparision between CPP Ship and FPP Ship

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In order to compare the maneuverability of the ship equipped with Controllable Pitch Propeller (CPP) and the ship equipped with Fixed Pitch Propeller (FPP) under the same sailing speed, the Nansei Maru (G. T. 75.14 ton) was employed, and the Zig-zag tests and the Turning circle tests on the vessels had performed by setting the sailing speeds at Full speed (8.5 knot), Half speed (6.5 knot) and Slow speed (4.5 knot) under the condition of CPP or FPP. Results obtained are as follows; 1. Under the sailing speed of 6.5 knot, there was no difference between CPP and FPP during the Zig-zag tests and the Turning circle tests. 2. Under the sailing speed of 4.5 knot, maneuverability index K was larger for CPP than for FPP and T was smaller. And both Maximum advance (D_A) and Maximum transfer (D_T) in the turning circle were smaller for CPP than for FPP. From the above, it can be said that the maneuverability on the both CPP and FPP hardly differ each other when sailing at a half speed, however, CPP was slightly superior to FPP in the maneuverability when sailing at a slow speed.

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