Stresses on sailing yachts at sea

This article describes load measurements taken on a number of yachts with lengths between 8.6 m and 35 m.

In order to achieve the optimum design of the hull structure and the rigging components on modern sailing yachts, information is required about the loads occurring on the yachts during operation. Decisions regarding the dimensions of a yacht's constructional elements are normally made manually based on load statements which are obtained using empirical guidelines or which are determined according to unreliable rules from the Classification Societies.

Measurements are needed if reliable load statements are to be made. These measurements should provide data on the external loads affecting yachts during various weather conditions and maneuvers. This article describes load measurements taken on a number of yachts with lengths between 8.6 m and 35 m. Hull pressures, rudder torques, forces in the mast, stays, shrouds and keel bolts together with accelerations at various points were measured.