Journal of the Kansai Society of Naval Architects, Japan

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We are convinced that the Z maneuvering test should be used to evaluate steering quality of ship quantitatively, and we have performed these tests on many ships built by Kawasaki Dock Yard in last few years. Now we have analysed the results by the method of Mr.K.Nomoto and his colleague, and have evaluated the parameters K,p and (-pK) quantitatively which represent turning, course keeping and quick response abilities of ship, respectively. Then we have reached to the following conclusion: 1. If rudder area ratio (RA)/(L・d) is constant, improvement of turning ability is incompatible with that of course keeping ability. Therefore, alteration of the form of fore and aft parts of ship means only to shift a compromise point between the above both abilities. However, if (RA)/(L・d) increased, both turning and course keeping abilities are improved, but quick response ability is determined only by (RA)/(L・d) approximately. 2. We may consider however that the possibility of some improvement of both the turning and course keeping abilities are still left in alteration of the form of fore and aft parts of ship. 3. The K,p expression is useful to express the requirements of ship handler for ship maneuvering, and to supply ship designer with suitable means which can satisfy these requirements. But, in order to complete the above mentioned method, it is necessary to carry out various model tests together with ship tests.

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Corrosion damages have often occurred on the propeller shaft sleaves. The author as a field engineer attempted to find a solution of them and draw a conclusion from his experience of inspecting many ships.

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The Yuyo-Maru No.5 is a 34,072 kilo-ton motor tanker equipped with a Hitachi B & W 1274VTBF-160 type turbo charged diesel engine as propelling machinery. She is the first motor tanker in the word equipped with 12 cylinder diesel engine of 15,000 BHP. The results of the official sea trials and also her maiden voyage verified her excellence in all respects. This report refers to the general installation of the machinery and especially touches on the counter-measure for protecting vibrations.

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The author presented, on the Journal No.86 of the Society, the general solution of the uniformly loaded plate which is accordant strictly to the requirements of the theory of elasticity. Now, the author shows the applications of the solution to the elliptical and rectangular plates with clamped edges. According to the results obtained, the deflection of the middle surface derived from the plate equation ∇^4w=P/D assuming w=0 and (〓w)/(〓n) at the boundary is smaller than what actually occurs.

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