小型航洋船の復原性能に就いて

概要

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In this paper a method of judging the stability of small sea-going vessels recently built in our country was studied. The standard condition selected for the research of stability is that in which a vessel sails in the direction of synchronism with waves under the action of her standard steady wind and centrifugal force and is suddenly struck by a squall when she is extremely inclined to the windward direction. New formulae were used to calculate the inclining couples due to the wind, centrifugal force and rudder pressure. For the unsymmetrical rolling among waves about the steady heel due to statical inclining couples the increase in the resistance to rolling under way and also in the apparent moment of inertia with the angle of roll was considered. When the vessel was struck by a squall, the angle of inclination was found by treating the new motion as composed of free rolling and forced rolling. A number of small vessels of all types with poor stability arms including several capsized ones were investigated by this new method and a critical line for stability was consequently obtained.
社団法人日本船舶海洋工学会の論文