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.

This content is only available via PDF.
You can access this article if you purchase or spend a download.