A convertible chair for a standup paddle board includes a seat portion having a first fabric structure defining a seat of the convertible chair and a pair of seat portion wings extending away from the seat. The seat portion further includes a first pair of structural members embedded in the first fabric structure and cooperating to define a boundary of the seat. The seat portion further incudes a hinge assembly embedded in the first fabric structure and fixed to each structural member of the first pair of structural members. The convertible chair further includes a back portion having a second fabric structure defining a back of the convertible chair and a pair of back portion wings extending away from the back. The back portion further includes a second pair of structural members embedded in the second fabric structure and cooperating to define a boundary of the back.

A convertible chair for a standup paddle board includes a seat portion having a first fabric structure defining a seat of the convertible chair and a pair of seat portion wings extending away from the seat. The seat portion further includes a first pair of structural members embedded in the first fabric structure and cooperating to define a boundary of the seat. The seat portion further incudes a hinge assembly embedded in the first fabric structure and fixed to each structural member of the first pair of structural members. The convertible chair further includes a back portion having a second fabric structure defining a back of the convertible chair and a pair of back portion wings extending away from the back. The back portion further includes a second pair of structural members embedded in the second fabric structure and cooperating to define a boundary of the back.

A standup paddleboard outrigger includes a long, narrow, lightweight displacement hull and a pair of outrigger pontoons mounted to a bridge. The two parts disengage for easy storage and transport. The hull has a platform to stand on. Paddling with a long handled paddle propels the craft through the water. The outriggers provide lateral stability/support and actuate the rudder in order to make turns. When a person stands on the platform and shifts body weight, the rudder will rotate to the right and the craft will turn to the right. The more weight that is shifted, the greater the turning action. The responsiveness to the shift of body weight can be adjustable for personal preference either firmer or more flexible, as is the turning response of the rudder fine or coarse turning.

A water sports board with enhanced flexibility includes an elongated core body and an elongated wooden or carbon fiber planar stringer disposed on the centerline of the core body. A plurality of elongated slots are formed in the upper edge of the stringer and extend downwardly toward the bottom edge. The slots are filled with an elastic rubber-like material. The water sports board can be a surfboard, windsurfing board, kite board, wakeboard or body boards.

A structural blank suitable for a watercraft is described. At least part of the structural blank comprises a plurality of structural elements connected to adjacent structural elements so that the plurality of structural elements are arranged in a matrix of structural elements forming at least a portion of the structural blank.

A water sports board includes a top deck forming portions of an outer surface of the water sports board; an underside forming portions of the outer surface; a set of internal baffle chamber structures disposed between the top deck and the underside, each baffle chamber structure fluidically isolated from another baffle chamber structure and including a plurality of pressurizable/inflatable baffle elements therein having hollow elongate internal passages that are fluidically coupled to one another; and a set of inflation/deflation valves fluidically coupled to the set of baffle chamber structures, wherein each inflation/deflation valve is accessible from the outer surface of the water sports board. The water sports board can also include a concavity adjustment mechanism by which concavity of the underside of the water sports board is adjustable. Essentially the entire water sports board is manufacturable by way of 3D printing.

The present disclosure is directed to a personal watercraft, such as a standup paddleboard, provided with a viewing window that allows the user to view the underwater environment. The viewing window may be watertight and constructed from at least two durable, transparent panels. The area between panels may be sealed from air and water infiltration. A user may add waterproof lights to the bottom of the standup paddleboard in order to allow viewing of the underwater marine environment at night.

A foldable recreational board that can be formed into a ridable board for riding and then folded when finished for easy transportation or storage. The foldable recreational board has foam sections covered by a flexible skin. The flexible skin includes a closing and opening mechanism. When the closing and opening mechanism is closed the skin is held very tight around the foam sections so that the foam sections are squeezed together tightly to form a ridable board. When the closing and opening mechanism is opened, pressure is released from the foam sections and the recreational board can be folded. In a preferred embodiment there are three foam sections and the opening and closing mechanism is two zippers attached to a inch thick flexible neoprene skin.

A modular floatation board may have predetermined flexibility or rigidity characteristics where the longitudinal bending moment of the assembled board is generally transmitted in a distributed manner from a nose module to a tail module through an intermediate module. The modules may be coupled together by an interface connection established between the intermediate module and the nose and tail modules. A tensioning member may compress the modules in longitudinal alignment and prevent the modules of the assembled board from separating.

A water sports board with enhanced flexibility includes an elongated core body and an elongated wooden or carbon fiber planar stringer disposed on the centerline of the core body. A plurality of elongated slots are formed in the upper edge of the stringer and extend downwardly toward the bottom edge. The slots are filled with an elastic rubber-like material. The water sports board can be a surfboard, windsurfing board, kite board, wakeboard or body boards.