Current Wolfson Unit tank test techniques are described and results presented that demonstrate how reliable data can be obtained from yacht models using simple equipment and measurement systems. The results presented are from models of 12m Yachts tested at both 1:10 and 1:4 scale. The correlation with full scale performance is shown for a 12m Yacht with a conventional keel. The induced and heeled components of resistance, obtained from tests at both scales, are compared for both the conventional and a winged keel. The interpretation of various characteristics in the tank data and the use of flow visualisation and measurement techniques are discussed. Scaling problems are considered and also shown is the influence of sail coefficients on the performance prediction for a 12m Yacht.
The 'A' class model yacht racing rule devised in 1923 is described and its parallels with their full size metre class rules are discussed. Unlike their full size counterparts, successful model yachts from all decades of the rule's existence survive in good condition. This provides an opportunity to assess progress in yacht design using towing tank techniques. Six championship winning models, representative of typical design types, were tested in the towing tank and the results are presented Windward sailing performance prediction calculations for the models are also using representative soft sail force coefficients. The developments in hull design, sail materials and hull construction leading to the latest 'A' class models are described. The use of model sailing trials as an aid to the design of full size yachts is also discussed.
Towing Tank tests on a single 2.4 m LOA model hull form with 3 alternative counter lengths, and 2 alternative rudder configurations have been carried out in the Southampton Towing Tank. The results were used to derive predictions of full scale resistance curves for a 10m L WL racing yacht. In addition to the resistance data, sinkage and, trim were measured. Wave profile measurements were also made to determine the influence of counter length on the hull generated waves. The resistance curves are presented for the 5 configurations investigated and the results are compared with published regression analysis methods of estimating hull resistance based on geometric hull parameters.
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