Abstract
The swimming motion of Tuna type fishes has excellent ability for its speed and efficiency. In the former studies, we made 1/1 scale model of Blue Fin Tuna body and caudal fin. The body resistance in the water flow are measured, and the lift and drag force of caudal fin are also measured. By using these data, we developed swimming mechanism and mounted on float, This paper shows a performance comparison between Tuna type caudal fin and Rectangular caudal fin.
