Modern ocean racing yachts often encounter considerable difficulty in steering and directional stability. In order to understand and correct these difficulties, it is necessary to identify these separate force and moment components of the hull, keel, rudder/skeg combination and the sail plan. This paper concentrates on the underwater forces and moments, using a combination of tank test data and aircraft analysis techniques. Sample calculation results are presented for a typical One Ton yacht. The influence of the sail plan is discussed. The direction for possible improvements are shown and recommendations are made as to the type of general­ized hull and sail data which are required to improve this basically simple static analysis.

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