Estudo experimental das forças de arrasto em barcos de escala reduzida

Abstract

This work has the goal to present a resulting experimental study of comparison between drag forces from the geometry variation in floating bodies. In this case, the floating bodies shown are two boats of different geometry. It was developed and made an instrument of measuring to gauge the drag force in low scale boats and of low cost compared to other experimental methods. The boats, in thesis, have the same weight. However, the dispose varying dimensions. The A model boat is thinner, while the B model is blunter. From the zero speed to about 0,6 meters per second (m/s), the B boat had lower values of drag force when submitted to the same speed. To speeds between 0,6 m/s to 0,8 m/s, the A boat had lower values of friction in comparison to the B boat. In the results analysis, it9s possible to realize that, while the A boat had higher values of the wave drag component, the B boat had higher values of pressure drag force and to viscous drag force