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Sailing yachts has been experienced extensively in the past years, generating very fast yachts. However, the search for speed has lead to very similar boats, with similar performance and, frequently, with poor behavior in rough water. The study of performance of sailing yacht in waves, experienced in heeled and yawed condition has been conducted, as well as the prediction of its motion in order to generate more data and provide tools to better design yachts for rough water. A deeper study of influence of the lateral force generated by the keel was done, testing the model with a normal fin keel and a pole keel (that did not generate lift). The free-running technique was applied in order to allow the model freedom for heeling and yawing. The resistance due to the attitude was obtained as an additional result. The conclusions are very interesting and intriguing and indicate the strong influence of the keel over the added resistance in waves, but the mechanism that rules that influence is not clear yet.

Keel Influence on the Added Wave Resistance for Yachts