Equipment for the conversion of a sailboat hull, having a substantially rectangular cockpit, into a rowing boat includes a frame that is substantially rectangular. Such frame is shaped to be arranged with the two major sides at the two major sides of the cockpit and is provided with a removable locking system of the frame to the hull of the boat. Two cantilever members jut out beyond the sides of the hull and are connected to the frame at one end and are provided with rowlocks on the other end. A seat is also provided, slidable along at least one couple of guides parallel to the major sides of the frame.

Equipment for the conversion of a sailboat hull, having a substantially rectangular cockpit, into a rowing boat includes a frame that is substantially rectangular. Such frame is shaped to be arranged with the two major sides at the two major sides of the cockpit and is provided with a removable locking system of the frame to the hull of the boat. Two cantilever members jut out beyond the sides of the hull and are connected to the frame at one end and are provided with rowlocks on the other end. A seat is also provided, slidable along at least one couple of guides parallel to the major sides of the frame.

A modular flotation device comprises a first elongated rigid pontoon module comprising a first pontoon section and a second pontoon section, a second elongated rigid pontoon module comprising a third pontoon section and a fourth pontoon section, and an intermediate frame module comprising longitudinal members extending substantially parallel to the first and second elongated rigid pontoon modules, and lateral members extending substantially perpendicular to the first and second elongated rigid pontoon modules. The first, second, third, and fourth pontoon sections can comprise identical connection profiles and are interchangeable with one another.

A modular flotation device comprises a first elongated rigid pontoon module comprising a first pontoon section and a second pontoon section, a second elongated rigid pontoon module comprising a third pontoon section and a fourth pontoon section, and an intermediate frame module comprising longitudinal members extending substantially parallel to the first and second elongated rigid pontoon modules, and lateral members extending substantially perpendicular to the first and second elongated rigid pontoon modules. The first, second, third, and fourth pontoon sections can comprise identical connection profiles and are interchangeable with one another.

The invention involves a paddleboard kit for converting any water sports board such as a surfboard into a paddleboard. An oar support assembly, typically secures oars with pivotal paddles to the board; facilitating rowing exercises that may be practiced while kneeling or standing. During use, the pivotable paddles pivot in such a way that the blade portion holds a steady position in relation to a shaft portion on the power stroke, whilst being free to fold in the opposite sense on the idle stroke when each stroke is executed as a substantially axial thrust of the shaft. The oar support assembly secures the pair of oars and is itself secured to the board by way of board couplers adjustably coupled to a portion of a strap that tightens to snuggly wrap around the board.

The invention involves a paddleboard kit for converting any water sports board such as a surfboard into a paddleboard. An oar support assembly, typically secures oars with pivotal paddles to the board; facilitating rowing exercises that may be practiced while kneeling or standing. During use, the pivotable paddles pivot in such a way that the blade portion holds a steady position in relation to a shaft portion on the power stroke, whilst being free to fold in the opposite sense on the idle stroke when each stroke is executed as a substantially axial thrust of the shaft. The oar support assembly secures the pair of oars and is itself secured to the board by way of board couplers adjustably coupled to a portion of a strap that tightens to snuggly wrap around the board.

The invention relates to a center-axis oarlock and methods of providing constant gearing throughout the arc of an oar in a boat or shell.

The invention relates to a center-axis oarlock and methods of providing constant gearing throughout the arc of an oar in a boat or shell.

Described herein are spacers for oarlock height adjustment, for example, for rowing racing shells. The spacers can have a C-shaped clamp section; and a grip section having two handles extending from said clamp section, wherein said clamp section is adapted to be securely fastened to an oarlock pin and to release from the oarlock pin when the handles of the grip section are squeezed together. The clamp section can have an outer rim section, an inner rim section, and an opening configured to pass around the oarlock pin. Also described herein are methods for adjusting oarlock height making use of the spacers.