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Article type: Cover
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Cover1-
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Cover2-
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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Article type: Appendix
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App1-
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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Kazuo ITO
Article type: Article
Pages
1-6
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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In this paper the author introduces a simple method of computing the diameter, pitch and developed area of propeller according to the formula for optimum diameter: D^2=(143)/N��<(SHP)/(V_3)> which was given by Dr. Taniguchi. The method of computation is explained by a numerical example. For reference to this paper 5 sheets of diagrams representing optimum relation of Unken's series model propellers are added.
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Atsuo YASAKI, Hiroshi OKAMOTO, Kazuya OKADA
Article type: Article
Pages
7-12
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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Performance of propellers with the tips cutted for shortening their diameters has been studied by open water test in Mejiro Tank. In self propulsion tests, cutting the tips of propeller usually decreases model ship's speed and increases propeller's revolution compared to original condition at same DHP. We studied this problem giving our mind to the case of change of main engine of ships. So, we had the following tests: Test 1. Influence of cutting tips; Adopted rate of diameter decrease is -10% and -20%, and fairing ranges from 0.8 to 1.0 of the diameter of each cutted propeller. Test 2. Influence of fairing range; 0% (no fairing), 0.1R, 0.2R and 0.3R fairing ranges are tested, rate of diameter decrease being 15% for each. Model propeller particulars are shown in Tables 1 and 2. Fig. 5 shows the variations of propeller revolution and ship's speed at constant DHP, analyzed from open water test results, considering the change of advance coefficient (1-w) according to the changing of diameter. From this analysis, we find first that the variation of propeller revolution derived from test is smaller than estimated value from series chart, and next that the wider the fairing range is, the larger the increase of revolution is, but the width of the fairing range has practically no influence of the propeller efficiency.
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Hitoshi FUJII, Hideo OMORI
Article type: Article
Pages
13-21
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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This paper describes the effect of steering speed on rudder performance, revealed by a experiment using a free running, self-propelled model. Comparing with steady lift and unsteady one calculated by Theodorsen's method, the difference, which is attributed to the unsteadiness, i.e., angular motion, is negligible for ordinary steering speed. However, according to the experiments employing the free model, the rudder performance, especially rudder torque, is affected with steering speed, because the modol motion is changed by the variation of steering speed.
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Yoshihiro IZUMOJI, Noritaka OOKA
Article type: Article
Pages
22-40
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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Recently for marine purpose there is a greater demand for medium sized diesel engines than for large engines, and accordingly, maintenance in case of using bunker oil for the former is more difficult than the latter. This paper refers to the problem of fuel and lube oils applied for these engines with respect to their maintenance, and is intended to explain generally the result of laboratory test of oils made by the writers. With regard to fuel oil, it is necessitated that firm specification shall be completed and that necessary quantity of products shall be available anywhere. With regard to cylinder lude oil, the writer mainly takes up a problem in this paper how to consider on adaptability of high alkaline oil. If similar type engines are used, high grade oil should still be applied for those engines which are used in high loaded and more continuous condition with less frequent overhauling. With regard to crank case oil, there is one problem, that is, sufficient purification and replacement of oil should be carried out in timely period.
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[in Japanese]
Article type: Article
Pages
41-44
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
45-49
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
50-53
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
54-58
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
59-62
Published: June 30, 1962
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
63-79
Published: June 30, 1962
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Article type: Appendix
Pages
80-82
Published: June 30, 1962
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Article type: Appendix
Pages
App2-
Published: June 30, 1962
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Article type: Appendix
Pages
App3-
Published: June 30, 1962
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Article type: Appendix
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App4-
Published: June 30, 1962
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Article type: Appendix
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App5-
Published: June 30, 1962
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Article type: Appendix
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App6-
Published: June 30, 1962
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Article type: Appendix
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App7-
Published: June 30, 1962
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Article type: Appendix
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App8-
Published: June 30, 1962
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Article type: Appendix
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App9-
Published: June 30, 1962
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Article type: Cover
Pages
Cover3-
Published: June 30, 1962
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