Abstract: An active roll stabilisation system for vessels, the system comprising at least one stabilisation element that extends from the vessel's hull, below the water line, on a side of the vessel, sensor means for sensing the vessel's motion and delivering control signals on the basis thereof, as well as moving means for moving the at least one stabilisation element relative to the hull in dependence on at least the control signals delivered by the sensor means, wherein the moving means are arranged for imparting at least a pivoting movement in the direction of the stem or the stern of the vessel to the at least one stabilisation element and wherein the moving means comprise a first hydraulic drive assembly for moving one stabilisation element, said first hydraulic drive assembly being composed of at least one auxiliary hydraulic cylinder for moving the stabilisation element relative to the hull and a main hydraulic cylinder for driving the at least one auxiliary hydraulic cylinder.

Abstract: An active roll stabilisation system for vessels, the system comprising at least one stabilisation element that extends from the vessel's hull, below the water line, on a side of the vessel, sensor means for sensing the vessel's motion and delivering control signals on the basis thereof, as well as moving means for moving the at least one stabilisation element relative to the hull in dependence on at least the control signals delivered by the sensor means, wherein the moving means are arranged for imparting at least a pivoting movement in the direction of the stem or the stern of the vessel to the at least one stabilisation element and wherein the moving means comprise a first hydraulic drive assembly for moving one stabilisation element, said first hydraulic drive assembly being composed of at least one auxiliary hydraulic cylinder for moving the stabilisation element relative to the hull and a main hydraulic cylinder for driving the at least one auxiliary hydraulic cylinder.