Apparatus and associated methods relate to using an additive (material deposition) process to incrementally form a closed-cell lattice structure formed as a unitary body in the shape of a marine hull cavity, the unit cells of the closed-cell lattice structure are substantially hollow. In an illustrative example, a method may include (a) forming a closed-cell lattice structure through additive manufacture, the hull cavity material may be bonded to an upper manufactured liner and a lower manufactured liner through lamination or mechanical connection. Unit cells of the closed-cell lattice structure may include hollow voids filled with gases. Providing the additive manufactured closed-cell lattice structure with a unitary body and hollow voids to trap gases may further advantageously promote the buoyancy and reduce the degeneration of a marine hull.

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 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 system comprises a carrier structure configured for carrying a module and a floating support structure configured for supporting the carrier structure. The carrier structure comprises first connection means and the floating support structure comprises second connection means, whereby the first and second connection means are configured for releasable connection and comprise contact surfaces that prevent the carrier structure from rotating about its longitudinal axis when the two structures are connected. A transportation and installation apparatus for the carrier structure is configured for being arranged on a floating vessel.

A gyroscopic roll stabilizer for a boat includes a flywheel shaft having a first end and an opposite second end. The flywheel shaft has first and second open-ended cavities formed on opposing ends. A first uneven seal encloses the first cavity, and a second uneven seal encloses the second cavity. The first and second uneven seals are both configured to provide asymmetric sealing such that greater resistance is provided against flow in a primary sealing direction, from a first side toward a second side, than in a secondary sealing direction, from the second side toward the first side. The first side of the second seal faces inward toward the second cavity, and the second side of the first seal faces inward toward the first cavity. The first and second seals are functionally inverted relative to each other. Related methods are also disclosed.

A gyroscopic roll stabilizer for a boat includes a flywheel shaft having a first end and an opposite second end. The flywheel shaft has first and second open-ended cavities formed on opposing ends. A first uneven seal encloses the first cavity, and a second uneven seal encloses the second cavity. The first and second uneven seals are both configured to provide asymmetric sealing such that greater resistance is provided against flow in a primary sealing direction, from a first side toward a second side, than in a secondary sealing direction, from the second side toward the first side. The first side of the second seal faces inward toward the second cavity, and the second side of the first seal faces inward toward the first cavity. The first and second seals are functionally inverted relative to each other. Related methods are also disclosed.

A framework (50) for modular construction of an offshore framework structure comprising a first bar (51) functioning as a floating body, a second bar (52), with two posts (53) for substantially parallel support of the bars (51, 52) and two belts (54) for tensioning the framework (50). Connection elements (55) are positioned at the respective ends of the bars (51, 52), which exhibit flanges (56) for attaching the connection elements (55) to the bars (51, 52). In the connection elements (55), receiving areas (57) are positioned transversely to the longitudinal direction (61) of the bars (51, 52) for attaching the posts (53). Further, the connection elements (55) have securing means (58) for securing belts (54) provided with tensioning devices (60) in such a way that the framework (50) can be held in shape or diagonally tensioned by means of the tensioning devices (60).

A relatively thick, rubberized adhesive tape is applied to an article to repair, patch, bond, seal, or waterproof the article, to join two or more articles, and/or to modify the appearance and/or physical properties of the article, such as by thermal insulation, shock resistance, vibration resistance, electrical insulation, and the like.

A relatively thick, rubberized adhesive tape is applied to an article to repair, patch, bond, seal, or waterproof the article, to join two or more articles, and/or to modify the appearance and/or physical properties of the article, such as by thermal insulation, shock resistance, vibration resistance, electrical insulation, and the like.

A method of assembling a watercraft of a family of watercraft includes, when assembling a first watercraft, attaching a front hull panel to a rear hull panel such that the front hull panel extends forwardly of the rear hull panel. The front hull panel and the rear hull panel form a hull of the first watercraft. The method also includes, when assembling the second watercraft: attaching a hull extension panel to the rear hull panel such that the hull extension panel extends forwardly of the rear hull panel; and attaching the front hull panel to the hull extension panel such that the front hull panel extends forwardly of the hull extension panel. The front hull panel, the hull extension panel and the rear hull panel form a hull of the second watercraft. The second watercraft has a second hull length greater than a first hull length of the first watercraft.