A boat having a transom and a rear platform extending at least partially across the transom. The rear platform includes a hatch defining at least partially the rear platform, the hatch having a bottom surface, and a hatch pivot for pivoting the hatch about a hatch pivot axis from a first hatch position to a second hatch position. The boat is free of an enclosed engine compartment. The hatch at least partially defines thereunder a space for receiving a marine outboard engine. The space extends rearwardly of the transom and is open at a rear of the boat.

A floating offshore structure of the present invention comprises: a plurality of columns; and a tower support column for supporting a tower of a power generation structure, wherein a polygonal shape is formed by means of an imaginary line connecting the columns, and the tower supporting column can be provided at one point of one of the sides of the polygonal shape.

A floating offshore structure of the present disclosure includes: a plurality of columns; and a plurality of pontoons installed at lower ends of the columns, respectively, wherein a polygonal shape is formed by an imaginary line connecting the columns, the pontoons are installed inside the polygonal shape, a cross-sectional area in a direction parallel to sea level of the pontoons is greater than or equal to the cross-sectional area in the direction parallel to the sea level of the columns, and the pontoons may have a shape protruding outward at the lower ends of the columns.

A wind-energy-power-generating device is disclosed for flotation on a body of water. The device includes a turbine assembly having rotor blades rotating about a rotation axis for harnessing kinetic energy from an airflow. The device includes a cowl at least partially surrounding said turbine assembly and defining an airflow passageway between a cowl inlet and outlet, having an inlet and outlet axis, respectively. The inlet and outlet axis intersect at a redirect angle. The device includes a base platform adapted to support the turbine assembly and cowl on the water. The cowl is rotatably mounted on the base platform such that it is rotatable around the turbine assembly to self-align with a wind direction. Stabilising arms extend from the base platform and are spaced circumferentially around a platform axis, to stabilise it on the water. A wind-energy-power-generating device secured to the ground or other fixed non-floating structure is also described.

A pontoon boat includes port and starboard pontoons and cross members connecting the pontoons. A shock absorber may be installed at each point of connection of the pontoons to the cross members. A cross member may be embodied as a double-webbed beam having first and second parallel flanges and first and second webs disposed between and connected to the flanges. Each pontoon may include a two-stage lifting strake having a first surface and a second surface inclined from the first surface.

A cockpit extension that extends aft of a boat transom for increasing the afterdeck area of the boat. The cockpit extension includes a deck that can be accessed from the afterdeck of the boat and an under-face beneath the deck that can be above or below the water-line of the boat. The cockpit extension can also include one or more of a gunwale, inner bulkhead, and outer freeboard. A running surface can also be provided on the under-face that improves the backing down process of the boat. The boat has at least two outboard engines, attached on the port and starboard sides of the boat transom, respectively.

An easily assembled highly portable watercraft comprising a modular boat system that seats one or more operators and is comprised of four or more pontoons connected to downward-sloping diagonally-placed outrigger beams with attached stiffeners connecting to a bridge-deck. The portable watercraft can be rowed, poled, propelled by fins or propellers, and sailed, for example, by an operator situated on the bridge-deck. The pontoons, outriggers, bridge-deck, and other aspects are easily interchangeable to conform to numerous configurations making a custom watercraft that is tailorable to varying water conditions.

A vessel having a stern and a bow, a deck having a top surface and a bottom surface; a first outer pontoon, a second outer pontoon, a central pontoon, and the motor pod each disposed below the deck and mounted to the bottom surface of the deck. The central pontoon is disposed between the first outer pontoon and the second outer pontoon, wherein the outer pontoons are spaced apart. The motor pod is disposed behind the central pontoon and between the first outer pontoon and the second outer pontoon. The motor pod defines a running surface, wherein the vessel is capable of planing on the running surface. The motor pod supports a motor at the rear. The vessel provides the ride characteristics and stability of a pontoon-style vessel at rest and at lower speeds while also providing the performance, maneuverability, and turning radius characteristics of a V-hull sport boat.

Described herein is an unmanned water vehicle comprising two or more hulls, a retractable sensor apparatus, a wireless communications device, a steerable drive apparatus, a mobility and control module providing operation of the unmanned water vehicle, and a power system comprising: one or more solar panels and an energy storage device, wherein the unmanned water vehicle is capable of continuous operation for a period of at least 3 months.

The present invention provides a hull-conversion device and method for modifying the underside of a watercraft, more specifically a multihull watercraft. The hull-conversion device comprising a water diverting surface, a kinematic assemblage, and a frame. The hull-conversion device may be operable to adjust the watercraft's characteristics in displacement mode and planing mode. The hull-conversion device may function to provide a more stable, controllable, and efficient platform for operating a multihull watercraft, and provide a suitable wake for towable water sports.