Abstract
This study investigates numerically the drag force on the Optimal dinghy, which is one of the official classes of international sailing regatta. The drag force is affected by the forward and backward tilt angles and the heels angles. The results revealed that the minimum drag force on the dinghy occurred under the flat dinghy and zero tilt angle condition. The drag force decreases with increasing backward tilt angle. Meanwhile the minimum drag force occurred at the 10 degree of the heeling angle under low velocity condition, and it occurred at the 5 degree while the sailing velocity exceeded 2 m/s. The correlation of the drag force and the sailing velocity can be expressed as FD = 13.87V2 for flat dinghy sailing.
Highlights
The Optimal dinghy is one of the official classes of international sailing regatta
This study aims to analyze the variation of dragged force resulting from water resistance under the various operating condition of the sailing Optimal dinghy, owing to the viscosity of water is much greater than that of air
The drag force increases rapidly with an increase of the sailing velocity, the correlation can be expressed as FD 13.87V 2
Summary
The Optimal dinghy is one of the official classes of international sailing regatta. It is the most popular sailing within all classes. The resulting wind force is divided into two perpendicular direction that is parallel to the longitude length of boat and the transverse width of the boat. The former force drive the boat forward, and the later force pull the sideward. Akimoto [6] considered the flow dynamics with the free surface between water and the air, and compared the complex shape of sailing boat. This study aims to analyze the variation of dragged force resulting from water resistance under the various operating condition of the sailing Optimal dinghy, owing to the viscosity of water is much greater than that of air
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