The invention relates to an active roll stabilization system for ships, including at least one stabilization element extending below the water line, which is mounted on a rotary shaft that extends through the ship's hull, a sensor for sensing the ship's movements and delivering control signals on the basis thereof to rotation member for rotating the rotary shaft for the purpose of damping the ship's movements that are being sensed through the stabilization element.The object of the invention is ...

Steering and/or stabilising device for motorised watercraft, with at least two operating units comprising each a retractable fin (4), characterised in that the retractable fins of each operating unit are contained in tubular watertight casings (5) open on the bottom or on the underwater area of the hull sides and located completely or for their prevailing portion inside the hull, one on the starboard side and the other on the port side, each fin (4) being guided axially in the associated tubular...

This invention relates to a fold-able panel as keel stabilizer for small boats of up to 20 feet in length approximately during trolling speeds of up to ten miles per hour approximately, such that the same motor can be used for trolling as well as higher speed point to point travel. More particularly it relates to adding a fold-able panel along the side of the boat closer to the transom. The panel when opened or unfolded extends below the bottom of the boat and provides stabilization during troll...

In a water craft, a stabilizer apparatus and method includes a stabilizer surface with a retractable arm connected with the stabilizer surface. An extension/retractor is connected with the retractable arm for extending and retracting the retractable arm beneath the water craft.

The present invention provides a watercraft having steering components (steering tabs or stabilizers) for maintaining steering capability even while amount of water ejected from a propulsion pump is decreased. The steering components are movably disposed on a hull of the watercraft at or below the water level on both right and left sides to be in an "Operating State" in which resistance of water is larger or to be in a "Non-operating State" in which the resistance of water is smaller in accordan...

An object is to suppress the rocking motion of a vessel body with a high level of accuracy by obtaining a required lifting force. A torque calculation section 27 calculates a torque of a fin 11 based on the pressure of a hydraulic cylinder 12. This torque is inputted to an angle of attack computing unit 24 via a torque adjusting unit 28, and based on this torque, a fin angle with respect to a flow of sea water, that is, an angle of attack of the fin is estimated. Then a command generation sectio...

The invention relates to a fin stabilization system adapted to minimize roll about the longitudinal axis of the boat during sharp cornering at very high speeds. In one form, equipment such as a machine gun is mounted to the bow of the boat and targets are adapted to be engaged in high-speed maneuvers when cornering and the deck of the boat is not excessively rolled whereby blocking visibility in a turn.

A stabilizing fin assembly for use with a watercraft includes a mounting structure, a stabilizing fin structure, and a releasable securement structure. The mounting structure is fixedly attached to a side portion of a hull of a watercraft. The stabilizing fin structure is removably mounted to the mounting structure. When the mounting structure is fixedly attached to the hull, the stabilizing fin structure is disposed externally of the hull and adjacent the side portion of the hull in an operativ...

An open-trough kayak sailing accessory kit is described in which a removable, portable, lightweight bi-pod mast is mounted to a removable board/hatch at the front of the kayak. The mast then tilts back over the kayak so as to center the sail over the craft. The bi-pod mast is hinged to the board and has various rope securement points to give it fore and aft stabilization. To provide lateral stability to the kayak, a leeboard kit according to the invention is included, having a leeboard removably...

Ventilated sponsons, personal watercraft having ventilated sponsons, and methods for adjusting the handling characteristics of personal watercraft by ventilating the sponsons. The present invention provides ventilated sponsons, sponsons, having holes formed through the sponsons to allow high pressure water trapped under the sponson to escape. The holes formed through the sponson thus allow for fine tuning and adjusting the performance characteristics and handling characteristics of the personal ...