Following previous papers on the formulation of a maneuvering model for sailing yachts by Delft Ship-hydromechanics Laboratory, further improvements have been made to a number of the generic expressions originally presented to determine the coefficients of this model. In particular the side force production by the keel and the rudder, also in each others presence, has been improved. New experimental results have been incorporated to account for the influence of downwash and heeling angle. In cooperation with the 2007 IACC team United Internet Team Germany the model has been used to get more insight in what is going on during a tack and if possible to find ways to optimize the tacking procedure. With the data available from both dedicated tests with the design in the wind tunnel and the towing tank the coefficients in the maneuvering model have been fine tuned to fit the German IACC contender. Subsequently the model has been used to analyze different rudder and trim tab operating procedures to find an "optimal" tacking procedure. The results of this study are presented here.
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