The invention is related to boatbuilding and may be used in construction and modernisation of high-speed monohull motor seagoing boats, where a single hull is used, which is moving in a surfing on a water cushion mode.

Stabilised hull of a monohull motor boat, which is using a surfing glide on a water cushion, with the deeply submerged displacement bearing blade, with a hull of a total width of not more than 50% of its length, which, in its lower part over its entire length, has a descending shape of its bottom surface in the direction bow-to-stern, where the bow is elevated up to the distance from the waterline, corresponding to at least 25% of the hull's width, and under the bow is a high wave-piercing stem. Wherein, in the front 40% of the hull's length, the bottom surface has a descending shape, which smoothly flows into the bottom surface of the stern part of the hull, and has an angle of descent in relation to the waterline at zero speed of at least 5 degrees, in the rear 60% of the hull's length, the bottom surface has a descending shape, and the angle of descent in relation to the waterline at zero speed of not more than 5 degrees, while it has an almost flat shape in its cross section, and is submerged by 70% or more of its length below the waterline, where the submerged part becomes the “surfing surface”, which is gliding, during the boat's movement, on a water cushion, and carrying not more than 70% of the boat's fully loaded weight.

The hull is made with a longitudinally positioned located underneath the bottom surface, symmetrical with respect to the boat's centerline, and commensurate with its length, vertically oriented, deeply submerged displacement bearing blade of narrow shape and of low wave/hydrodynamic resistance; wherein the ratio of the length to the width of the bearing blade of at least 20 times, with the displacement of the bearing blade corresponding to 30-50% of the boat's fully loaded weight, and with its height (excluding the stem) of not less than 20% of the maximum width of the hull, wherein ensuring a deep submersion of the bottom edge of the bearing blade in relation to the waterline. The bearing blade is made with wave-piercing lines, with a high wave-piercing stem, reaching by its height the bow end of the bottom surface of the hull, with the sharp rear and front lines, and the smooth middle lines; and has a triangular cross section over its entire length, with the most acute angle at its bottom; and the maximum width of the bearing blade is located within 40-60% of its length, which determines the centre of the displacement of the bearing blade within 40-60% of its length, in its upper third.

The cont

A fin bearing assembly for a fin stabilizer of a watercraft includes a shaft for driving at least one fin of the fin stabilizer that is disposed coaxially in a trunk pipe, and the fin is rotatably supported radially outward on the trunk pipe by at least two fin bearings. The shaft for the rotating driving is connected inside the hull to a drive unit of the fin stabilizer by a transmission of the fin stabilizer such that the shaft and the transmission rotate together.

A ballast water-free ship using a difference in the depth of the bottom shell plate between the bow/stern and the midship section and a construction method thereof. A stepped portion is formed between either the bow or the stern and the midship section, such that the depth of the bottom shell plate of either the bow or the stern differs from the depth of the bottom shell plate of the cargo containment in the midship section, so that cargo can be loaded and unloaded without ballast water operation.

A system is demonstrated for heave neutralisation of semisubmersible platforms that can be built into any conceivable configuration of such platforms. That the system is also conceivably active and predicatively can be controlled can be concluded by analysing the appended calculation models. As an example FIG. 18, column E, is mentioned, wherein the water volume increments in the rise canister are 37 cubic metres for each half metre of wave height, so that, with reference to column A, from H=10.5 m to H=12 m is 4×37 148 cubic metres more than 150 tonnes—simultaneously with the air pressure, shown in column K, increasing from 123.86 to 131.05 kPa, a difference of just 6.19 kPa (0.0619 bar or 61.9 millibars). Large ballast volumes can be moved out and in of the system at small pressure changes and short response time.

A floating platform for high-power wind turbines, comprising a concrete substructure, said concrete substructure forming the base of the platform, which remains semi-submerged in the operating position, and consisting of a square lower slab on which a series of beams and five hollow reinforced concrete cylinders are constructed, distributed at the corners and the center of said lower slab; a metal superstructure supported on the concrete substructure and forming the base for connection with the wind turbine tower, said tower being coupled at the center thereof; and metal covers covering each of the cylinders, on which the metal superstructure is supported and to which vertical pillars are secured, linked together by beams, which join at the central pillar by an element whereon the base of the wind turbine tower is secured.

An offshore semi-submersible platform includes: at least three stabilizing columns; a truss structure securing the at least three stabilizing columns to one another; for at least one of the stabilizing columns, a substantially horizontal perforated plate and a fastening arranged for fastening the substantially horizontal perforated plate to the stabilizing column at least in a working position below a bottom surface of the stabilizing column, creating a wave load attenuation chamber being defined between the substantially horizontal perforated plate in the working position and the bottom surface of the stabilizing column.

The present invention relates to a floating support structure (1) provided with a main floater (2) and with a heave plate (3). Heave plate (3) comprises a section varying with depth. Furthermore, heave plate (3) has a minimum horizontal section Sd1 greater than horizontal section Sc of main floater (2).

The present invention is a floating support structure (1) provided with a main floater (2) and a heave plate (3). Heave plate (3) comprises a single row of orifices (4), substantially parallel to the periphery of the heave plate.

A ballast water-free ship using a difference in the depth of the bottom shell plate between the bow/stern and the midship section and a construction method thereof. A stepped portion is formed between either the bow or the stern and the midship section, such that the depth of the bottom shell plate of either the bow or the stern differs from the depth of the bottom shell plate of the cargo containment in the midship section, so that cargo can be loaded and unloaded without ballast water operation.

A floating offshore structure includes a buoyant hull including a first column, a second column, and a pontoon coupled to the first column and the second column. The pontoon extends horizontally from the first column to the second column. The pontoon includes a first tubular member, a second tubular member positioned laterally adjacent to the first tubular member, a first edge plate extending horizontally from the first tubular member, and a second edge plate extending horizontally from the second tubular member. The first tubular member and the second tubular member are disposed between the first edge plate and the second edge plate. Each tubular member has a central axis, a first end coupled to the lower end of the first column, and a second end coupled to the lower end of the second column. The longitudinal axis of the first tubular member and the longitudinal axis of the second tubular member are disposed in a common horizontal plane.