A hull structure for a semi-submersible wind power turbine platform. The hull structure includes first, second and third buoyant stabilizing columns extending in a substantially vertical direction; and first and second elongated submersible buoyant pontoon structures extending in a substantially horizontal direction. The the hull structure generally has a V-shape in the horizontal plane with the first and second pontoon structures forming legs in the V-shape and with the second column located where the legs meet. The second column has a cross sectional area at its intended operational waterline that is larger than the cross sectional area of each of the first and third columns at their corresponding intended operational waterlines so that the second column exhibits an operational waterplane area that is larger than the operational waterplane area of each of the first and third columns when the hull structure is set in the operational state.

A fin stabilizer is provided for a vessel and includes a fin which is supported by a shaft that extends below the waterline. The shaft is fixed in rotation along its elongate axis relative to the vessel and the fin includes an actuator mechanism which causes the fin to rotate around the shaft to counteract roll of the vessel. In some cases, the actuator may be hydraulic and the shaft may include passages therethrough to transfer hydraulic fluid/pressure from the vessel's interior hydraulic system through the shaft and into the actuator to cause the fin to rotate. The fin may also be able to pivot into a storage position where, for example, the shaft is folded into a cavity in the vessel hull.

A floating marine structure which includes a first float disposed at the center and a plurality of second floats disposed around the first float, where the first float has a floating body made of a floatable material in a polygonal prism shape, a damping unit coupled to the bottom of the floating body at the center, having the same cross-section as the floating body, having a cross-sectional area larger than the cross-sectional area of the floating body, and reducing a shake of the first float in the sea, and at least one coupling hole formed at each side of the floating body. The second float has the same shape as the floating body and has coupling protrusions formed at sides facing the sides of the floating body and inserted in the coupling holes, and wherein the coupling holes are formed at alternate sides of the floating body.

A stabilizer that extends from the hull of a watercraft below the waterline when needed is disclosed. The stabilizer produces added drag on the watercraft's counteracting a tendency to change bearing. Stabilization chambers of the stabilizer hold semi contained water to produce an extended drag effect by adding lateral weight due to the water that is semi contained within the chamber during use. The restricted flow of water into and out of the stabilizer and the outer dimensions of the stabilizer provides lateral drag to mute any ambient drift.

A hull structure for a semi-submersible wind power turbine platform and a method for loading a set of such hull structures onto a semi-submersible cargo carrying marine vessel. The hull structure includes first, second and third buoyant stabilizing columns extending in a substantially vertical direction; and first and second elongated submersible buoyant pontoon structures extending in a substantially horizontal direction. The hull structure generally has a V-shape in the horizontal plane with the first and second pontoon structures forming legs in the V-shape and with the second column located where the legs meet. The hull structure is arranged so as to exhibit: i) a first angle in the horizontal plane between a central longitudinal axis of the first pontoon structure and a central longitudinal axis of the second pontoon structure; and ii) a second angle in the horizontal plane between a) a first imaginary line between a central point of the first stabilizing column and a central point of the second stabilizing column and b) a second imaginary line between the central point of the second stabilizing column and a central point of the third stabilizing column, wherein the second angle is larger than the first angle.

There is provided systems and methods for stabilising a vessel against a stationary structure. Embodiments of the system include a sensor system, a processor, and a vessel control system. The processor is configured to determine a change in the position and/or motion of the waterborne vessel relative to the stationary structure based on sensor data, and to determine a minimum corrective force required to oppose the change. The minimum corrective force is then delivered by the vessel control system operable to stabilise the waterborne vessel relative to the stationary structure.

A ship hull comprises a bottom portion having a wave piercing bow, a top portion having first and second side surfaces extending to a top deck and a substantially horizontal surface extending away from the bottom portion at a position between the bottom portion and the top portion.

An offshore floating platform device, a construction method, and an operation method are provided. The device includes a pontoon carrier component. The pontoon carrier component includes a pontoon provided with a counterweight body at a bottom and a central cylinder at a top. The pontoon is provided with an anchor chain assembly on its outer cylindrical surface for keeping the elevation of the pontoon carrier component in the sea. A platform is arranged around an edge of a top surface of the central cylinder. Multiple tower bases are provided on a top surface of the central cylinder for installing a tower of the wind turbine. A buoyancy support component is provided on an outer cylindrical surface of the central cylinder, and the buoyancy support component ascends and descends as it rolls along the outer cylindrical surface of the central cylinder in response to changes in water level.

A system includes a marine propulsion device, an actuator, a sensor, and a controller. The sensor detects motion information indicating an up-and-down directional motion of a bow of a watercraft. The controller is configured or programmed to selectively set either a trim-up direction or a trim-down direction as a trim direction in accordance with the up-and-down directional motion of the bow based on the motion information. The controller is configured or programmed to control the actuator to cause the marine propulsion device to perform a trim motion in the trim direction, and to set a duration of the trim motion to be different between when the marine propulsion device is caused to perform the trim motion in the trim-up direction and when the marine propulsion device is caused to perform the trim motion in the trim-down direction.

An offshore floating platform device, a construction method, and an operation method are provided. The device includes a pontoon carrier component. The pontoon carrier component includes a pontoon provided with a counterweight body at a bottom and a central cylinder at a top. The pontoon is provided with an anchor chain assembly on its outer cylindrical surface for keeping the elevation of the pontoon carrier component in the sea. A platform is arranged around an edge of a top surface of the central cylinder. Multiple tower bases are provided on a top surface of the central cylinder for installing a tower of the wind turbine. A buoyancy support component is provided on an outer cylindrical surface of the central cylinder, and the buoyancy support component ascends and descends as it rolls along the outer cylindrical surface of the central cylinder in response to changes in water level.