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The study of a propulsion system by fin stroke like fish, dolphins and birds is a kind of application of organic phenomena to mechanics. The propulsion system by fin stroke, which has such advantages as safety and silence compared with a common screw propeller, is applied to propulsive systems of ships.<BR>In this work, theoretical analysis of a simple two-dimensional oscillating wing model is described; the relationship between fin's behavior and its thrust is experimentally obtained; several new propulsion systems are examined on their practicality with loaded on a 3.5 m long boat.<BR>In result, (1) the mean thrust generated by fin stroke is simply expressed by the theoretical equation which coincides an experimental one. (2) The mean thrust and the propulsive efficiency increased when the fin's angle of deviation has a phase delay. (3) The mean thrusts by propulsion system by fin stroke on the boat were almost similar to those by a common screw in the condition of the same wing area and in a low speed range.<BR>Thus, the fin stroke system was proved to be applicable for propulsion of safe and silent ships.
公益社団法人日本マリンエンジニアリング学会の論文