The Analysis of the Stability of Small War Crafts of defunct Japanese Navy

Abstract

Now defunct Japanese Navy prescribed, at its designing of war crafts, in consideration of their stability capacity, the permissible lowest values of GM, OG, Stability range, etc. separately, in accordance with the class of vessels and their sizes.
Later on, however, due to the development of stability theory, it became possible to determine the stability capacity, by applying the organic relation of these values mentioned above and obtaining a value that is the combination of these values.
In this thesis the authors, basing upon the“Theory of Safety Criterion of a Ship”established by Prof. Watanabe, have calculated the Safety Criterion c Value, studying the actual instances of 15 vessels, including destroyers and torpedo boats of the defunct Japanese Navy, and about 90 of their different conditions and analysed them from various angle, such as the transition of the history, and the statistic distributional state.
This study of the authors has led to the possibility to determine the permissible lowest value of safety criterion of naval small crafts.