A kiteboard includes a base, a front extension and/or a back extension. The base includes a top face and a bottom face and an outer edge face. The outer edge face is extending in a circumferential direction along an outer contour of the top face and the bottom face and includes a first mechanical interface. The front extension and/or the back extension include a top face and a bottom face and an inner edge face. The inner edge face extends between the top face and the bottom face along an inner contour and corresponds at least partially to the outer contour of the base. The inner edge face further includes a second mechanical interface, such that in an assembled position the first and the second mechanical inter-face are engaged with each other to position the front extension and/or the back extension with respect to the base.

A waterboard assembly (such as a surfboard assembly) may include a first body portion, a second body portion, and a joining mechanism positioned to releasably attach the first body portion to the second body portion. In some embodiments, the joining mechanism may include a first interlocking portion and a second interlocking portion. The first interlocking portion may be attached to, integral with, or part of, the first body portion. The second interlocking portion may be attached to, integral with, or part of, the second body portion. The first interlocking portion may releasably interlock with the second interlocking portion. In some embodiments, the joining mechanism may include one or more fasteners for holding the interlocking portions together.

A waterboard assembly (such as a surfboard assembly) may include a first body portion, a second body portion, and a joining mechanism positioned to releasably attach the first body portion to the second body portion. In some embodiments, the joining mechanism may include a first interlocking portion and a second interlocking portion. The first interlocking portion may be attached to, integral with, or part of, the first body portion. The second interlocking portion may be attached to, integral with, or part of, the second body portion. The first interlocking portion may releasably interlock with the second interlocking portion. In some embodiments, the joining mechanism may include one or more fasteners for holding the interlocking portions together.

An electrically motorized watercraft may include a hull module and a driveline system. The driveline system may include an electric power module and a driveline module. The driveline module may be arranged at an underside of the hull module.

An electrically motorized watercraft may include a hull module and a driveline system. The driveline system may include an electric power module and a driveline module. The driveline module may be arranged at an underside of the hull module.

A hydrofoil watercraft, in particular, a hydrofoil board is described herein. The hydrofoil board may comprise one or more of a body, a hydrofoil assembly, and/or other components. The body may have one or more of a deck surface configured to support a rider, a bottom surface opposite the deck surface, and/or other surfaces and/or features. The body may comprise a fore portion having a planing surface forming part of the bottom surface. The body may have an aft portion having an aft bottom surface forming part of the bottom surface. The fore portion may be toward a front end of the board. The aft portion may be toward a rear end of the board. An aft cross-sectional thickness between the deck surface and the aft bottom surface may be less than a fore cross-sectional thickness between the deck surface and the planing surface.

A portable inflatable diving float that includes an inflatable float body is revealed. The float body consists of a horizontal portion provided with a left folding area formed on the left side and a right folding area formed on the right side. After the left and the right folding area being folded to a middle portion of the float body, a left edge portion of the left folding area and a right edge portion of the right folding area are connected by a first connection member and kept in the folded state. A flat body formed after deflation of the float body becomes a backpack body with smaller area. At least one strap member is connected between the top end and the bottom end on a front side or a back side of the float body so that users can carry the backpack body on their back.

Recreational board such as paddleboards and surfboards, and methods of assembling and disassembling the recreational boards, the boards including a front portion, a back portion, and a plurality of elongated supports extending between the front portion and the back portion and located within, and removable from, recesses in the front portion and/or the back portion. The recreational board may further include a releasable fastening element securing connecting the front portion to the back portion.

Recreational board such as paddleboards and surfboards, and methods of assembling and disassembling the recreational boards, the boards including a front portion, a back portion, and a plurality of elongated supports extending between the front portion and the back portion and located within, and removable from, recesses in the front portion and/or the back portion. The recreational board may further include a releasable fastening element securing connecting the front portion to the back portion.

A wave riding vehicle having a top surface, a bottom surface, a rear tail, a nose, and said tail and nose are connected by opposite left and right side rails, and the side rails extend substantially linearly from the tail and away from a central axis and then linearly extend to the nose and toward the central axis and embodiments include a central arcuate hump that transverses the top surface.