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The hydrodynamic resistance of a sailing yacht is strongly influenced by the large appendages and heeling angles. The paper presents a comparative analyze of the theoretical and experimental results related to the influence of the appendages and heeling angle on the hydrodynamic resistance of a yacht, of 14.23 m length. The theoretical approach was based on the method proposed by Larson and Eliasson. The residuary resistance was calculated using the empirical relations developed by Gerritsma, on the basis of Delft systematic yacht series. The components of the yacht resistance including the keel, rudder and additional weight influence were estimated by using a computer code performed in Java language, in the Research Centre of Naval Architecture Faculty. The experimental model tests have been carried out in the Towing Tank of the Naval Architecture Faculty of “Dunarea de Jos” University of Galati. A set of combinations of appendages and heeling angles of 5°, 10° and 15° has been considered. The comparative diagram between the theoretical and experimental results of the yacht resistance shows large differences. The important influence of the heeling angles and large appendages on the yacht hydrodynamic resistance was highlighted. As a consequence, the increasing of the accuracy level of the resistance prediction methods and the appendages resistance optimisation become very important objectives, during the initial design stages.
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