Joseph M Silvia DeceasedWarwick, RI

4905622, Mar 6, 1990

May 9, 1988

7/191835

Joseph G. Silvia - Newport RI

B63B 3900

114122

A system for reducing roll of vessels comprises at least one and preferably a pair of hydrofoil devices suspended from lines rigged on each side of the vessel, preferably from outrigger booms. The devices are asymmetrical foils which are arranged to provide a downwardly acting hydrodynamic force as the devices move with respect to the water. The center of the hydrodynamic force, the center of gravity of the device, and the suspension line attachment being in vertical alignment to provide a balanced foil. The devices function when the vessel is under way and when the vessel is stationary. The hydrodynamic force provides tension in the suspension lines which serves to damp the tendency of the vessel to roll while under way. The hydrodynamic force assures that the devices will not suddenly lose their damping effect or loose control and jerk or breach. When not under way, rolling is damped by differential resistance of the devices to upward movement through the water.