On a Method of Determination of Principal Dimensions and Ship-Form for High-Speed Vessels

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  • 高速艦舩の主要寸法及び舩型の選定法に就て

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Results of model ship experiments which were conducted at the naval experimental tank in Tokyo have been compiled during last twenty years for about 130 actual high-speed vessels as well as many model ships of methodical experiments which cover very wide range of ship-form beyond those of actual ships. Ship-form coefficients and "elements of form" for optimum resistance qualities are examined by tracing minimum [〇!C] envelopes for successive values of [〇!K] of standardised "[〇!K]-diagrams". In designing a high-speed vessel it is assumed that the first given items are the displacement and the speed of the ship. A method of estimating principal dimensions and ship-form, having desired amount of GM., as well as horse-power to propel said displacement at intended speed is treated as per table 3 in text and figs.7,8. In analysing steam trial results of actual ships by the aid of their model experiments, two empirical coefficients are introduced, one is to cover the scale effect, weather conditions etc., and the other is to provide for the cavitation effect of actual propellers. The author is in opinion to arrange those empirical coefficients on proper criterions for the reference of the most successful design of future ships.

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