The variation of lateral stability of a sailing yacht with forward motion

Article type: Research Article

Authors: Millward, A.

Affiliations: Department of Mechanical Engineering, University of Liverpool, England

Abstract: An experiment was carried out to measure the lateral stability and vertical position of the Centre of Lateral Resistance of a one sixth scale model of the hull of a Dragon yacht when moving at a steady speed through the water. The results obtained showed that the stability with forward motion was up to 7.6% greater than the static stability for the test conditions. It was also found that the actual Centre of Lateral Resistance was 2 1/2% of the draught nearer to the waterline than the design estimate in the upright condition but 6% lower for heel angles in excess of 20°. For normal sailing conditions, with heel angles in the region of 10°–20°, the conventional design value for the vertical position of the Centre of Lateral Resistance would be a reasonable first approximation.

DOI: 10.3233/ISP-1978-2528603

Journal: International Shipbuilding Progress, vol. 25, no. 286, pp. 157-159, 1978