Amodel of a sailing yacht is towed with a small angle of attack, or leeway angle, about the vertical axis. the drag force and side force are measured separately. if the yacht hull operating in this manner can be regarded as a vertical hydrofoil in the presence of the free surface, what are the appropriate scaling laws to apply to each force component? distin- guish between parameters that should be scaled in principle and those that would be most important in a model test. in fresh water (15°c), towing- tank tests of a model 2 m long with wetted-surface area 1.5 m² give a measured drag force of 10 n and a side force of 28 n at a speed of 1.4 m/s. what are the corresponding full-scale results for a yacht 10 m long in salt water (15°c)?