470 Class is a double racing yacht and an Olympic item. It control performance is very good. Driving skills is one of the keys to success in the regatta. So,crews should have a certain comprehend to the manoeuvrability of the hull and centerboard. The centerboard is one of the important appendage to the hull,and it has great influence to the hydrodynamics of the hull. At present,Research on the hydrodynamics of the centerboard for 470 Class Yacht is not much. In order to make the players to have more scient...