A variety of multi-use, configurable watercraft is disclosed. A first type of watercraft used in a first water-based activity may be used as a component in a second type of watercraft used in a second water-based activity. For example, a stand-up paddleboard (SUP) may be used for paddle boarding, and then converted into a kayak, sailboat, catamaran, motorboat, or other type of vessel by adding one or more components to the SUP. In one embodiment, two paddleboards are used to construct a variety of multi-hull watercraft.

An inundation prevention system for ship is provided. The inundation prevention system for ship includes a fire-extinction gas ejection part configured to eject a fire extinction gas to an installation area prepared in a hull, an airbag part of 3D shape disposed in the installation area, and an airbag actuation part configured to supply the fire extinction gas to the airbag part, if inundation occurs in the installation are, and to inflate the airbag in the installation for compulsory buoyancy.

An attachment system for an offshore structure includes a porch configured to be affixed to the offshore structure, an adaptor configured to engage with one or more plates of the porch, and a latch to retain the adaptor into engagement with the one or more plates, in which the adaptor is configured to support an equipment device. A method of attaching equipment device to a structure includes affixing a porch of an attachment system to the structure, engaging an adaptor with one or more plates of the porch, and attaching an equipment device to the adaptor.

An attachment system for an offshore structure includes a porch configured to be affixed to the offshore structure, an adaptor configured to engage with one or more plates of the porch, and a latch to retain the adaptor into engagement with the one or more plates, in which the adaptor is configured to support an equipment device. A method of attaching equipment device to a structure includes affixing a porch of an attachment system to the structure, engaging an adaptor with one or more plates of the porch, and attaching an equipment device to the adaptor.

The invention generally relates to devices for stabilizing floating structures and systems and methods utilizing such stabilization devices. Some embodiments of the stabilization device include a fabric material having a collapsed configuration and an expanded configuration. The expanded configuration of the fabric material may form a column of the fabric material. The column of fabric material may define an internal volume. The front end of the column of fabric material may be closed, and the back end of the column of fabric material may define an opening for receiving water for filling the internal volume. When filled with water, the stabilization device may improve roll stabilization of a floating structure. The floating structure may be a flotation device of an emergency flotation system, boat, or inflatable raft, for example. The emergency flotation system may be used with aircraft, (e.g., helicopters) to provide stabilization when the aircraft is ditched in water.

The invention generally relates to devices for stabilizing floating structures and systems and methods utilizing such stabilization devices. Some embodiments of the stabilization device include a fabric material having a collapsed configuration and an expanded configuration. The expanded configuration of the fabric material may form a column of the fabric material. The column of fabric material may define an internal volume. The front end of the column of fabric material may be closed, and the back end of the column of fabric material may define an opening for receiving water for filling the internal volume. When filled with water, the stabilization device may improve roll stabilization of a floating structure. The floating structure may be a flotation device of an emergency flotation system, boat, or inflatable raft, for example. The emergency flotation system may be used with aircraft, (e.g., helicopters) to provide stabilization when the aircraft is ditched in water.

A watercraft with outboard stabilizing members on a hull with a bow wrap and port and starboard side sheets with one or more longitudinal channels. The port and starboard stabilizing members comprise buoyant members in a sheath having one or more longitudinal keepers that are configured to be received into the side sheet channels. Tension members extend through the keepers, and are attachable near the aft end of the watercraft, and releasably engage tensioning mechanisms in the bow wrap, for releasably attaching the stabilizing members to the side sheet. Deck access plates through the side walls provide access to the tensioning mechanisms, which may be, for example, crank or electric winch mechanism.

A watercraft with outboard stabilizing members on a hull with a bow wrap and port and starboard side sheets with one or more longitudinal channels. The port and starboard stabilizing members comprise buoyant members in a sheath having one or more longitudinal keepers that are configured to be received into the side sheet channels. Tension members extend through the keepers, and are attachable near the aft end of the watercraft, and releasably engage tensioning mechanisms in the bow wrap, for releasably attaching the stabilizing members to the side sheet. Deck access plates through the side walls provide access to the tensioning mechanisms, which may be, for example, crank or electric winch mechanism.

Disclosed in the present disclosure are a swinging wing plate structure for providing buoyancy for a ship body and the ship body with the wing plate structure, relating to the technical field of boats and ships. The ship body includes a ship main body, where the ship main body is provided with vertical structures on two sides and inclined plates in front and rear, two ends of the vertical structures on the two sides extend out of the inclined plates in the front and rear of the ship main body, lower ends of the vertical structures extend out of a bottom of the ship main body, accommodating grooves are provided on the two sides of the ship main body, a portal arranged vertically is provided in the accommodating grooves, two sides of the portal are provided with vertical slide rails, slide plates are slidably connected to the vertical slide rails, first hydraulic cylinders are arranged on the portal, piston rods of the first hydraulic cylinders are connected to the slide plates, the slide plates are provided with wing plates, and ends of the wing plates extend out of the two sides of the ship main body. The vertical structures on the two sides of the ship main body reduces an influence of waves, when a ship reaches a certain speed, the wing plates are unfolded, then the wing plates make contact with a water surface, and the wing plates are lifted by water flow, so as to increase the buoyancy of the ship main body and increase a ship speed.

Described is a multi-use offshore structure having a first configuration and a second configuration. The first configuration includes a pontoon base disposed at a lower end of the multi-use offshore structure. A deck is disposed at an upper end of the multi-use offshore structure, and hull column structures extend between the pontoon base and the deck. The second configuration includes the pontoon base, the deck, and the hull column structures of the first configuration. A set of sponsons is formed to be installed on the hull column structures, and a deck expansion unit is connectable with the deck.