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.

An oarlock that is designed to be used with an oar-right. It is an oarlock that has a pin for securing the oarlock in an oar holder or gunwale of a boat. A U-shaped bracket is attached to the pin. There is a formed piece that has a cylindrical upper portion and a lower squared portion that is secured to the U-shaped bracket. An oar fits into the cylindrical upper portion and the oar-right fits into the lower squared portion of the formed member. The U-shaped bracket can rotate on the pin, which means that the oarlock can rotate 360 degrees and the formed member is free to pivot between the arms of the U-shaped bracket. Because the formed piece is a closed member, the oar cannot come out of the oarlock no matter how much the oar maybe moved or jostled by rough water, nor can the oar rotate on its own axis.

An oarlock that is designed to be used with an oar-right. It is an oarlock that has a pin for securing the oarlock in an oar holder or gunwale of a boat. A U-shaped bracket is attached to the pin. There is a formed piece that has a cylindrical upper portion and a lower squared portion that is secured to the U-shaped bracket. An oar fits into the cylindrical upper portion and the oar-right fits into the lower squared portion of the formed member. The U-shaped bracket can rotate on the pin, which means that the oarlock can rotate 360 degrees and the formed member is free to pivot between the arms of the U-shaped bracket. Because the formed piece is a closed member, the oar cannot come out of the oarlock no matter how much the oar maybe moved or jostled by rough water, nor can the oar rotate on its own axis.

A narrow beam rotomolded foam filled catamaran that incorporates regular points of attachment through the deck and a tubular frame that is highly customizable with modular accessories making it ideal for maneuverability, stability, durability, transportation, storage, and customization.

A narrow beam rotomolded foam filled catamaran that incorporates regular points of attachment through the deck and a tubular frame that is highly customizable with modular accessories making it ideal for maneuverability, stability, durability, transportation, storage, and customization.

A paddle for watercraft has a shaft to which blades are attached at opposite ends. The blades may be mounted directly to the shaft or via drop cranks. The shaft is suspended on handles oriented transversely to the shaft's longitudinal axis. The handles are capable of pivoting motion relative to the shaft as well as rotational motion about their respective longitudinal axes.

The clamping device may comprise a platform base, a pair of locking claws, and a mount. The clamping device may be coupled to a base object via the mount. The clamping device may retain a clamped object to the base object using the pair of locking claws. An individual locking claw selected from the pair of locking claws may comprise an over-center linkage resulting in bistable positioning of the individual locking claw. The individual locking claw may transition from an open position to a closed position under the influence of a closing force. The individual locking claw may transition from the closed position to the open position under the influence of an opening force. As a non-limiting example, the clamping device may retain a paddle to a boat by clamping onto a shaft of the paddle.

The clamping device may comprise a platform base, a pair of locking claws, and a mount. The clamping device may be coupled to a base object via the mount. The clamping device may retain a clamped object to the base object using the pair of locking claws. An individual locking claw selected from the pair of locking claws may comprise an over-center linkage resulting in bistable positioning of the individual locking claw. The individual locking claw may transition from an open position to a closed position under the influence of a closing force. The individual locking claw may transition from the closed position to the open position under the influence of an opening force. As a non-limiting example, the clamping device may retain a paddle to a boat by clamping onto a shaft of the paddle.

An oarlock-installation for a boat in which an oarlock is mounted on an upright pin for angular displacement about the pin during rowing of the boat, the oarlock-installation comprising a mechanism for deriving measurements of angular displacement of the oarlock from a datum angle about the pin during the rowing, a mechanism for deriving measurements of force exerted on the oarlock during the rowing, and a mechanism for deriving measurement of rowing power from the measurements of force and the measurements of angular displacement. The rowing-boat oarlock-installation may also comprises a power module, attached to the oarlock, which is responsive to rowing of the rowing-boat to derive force measurements in accordance with rowing forces exerted on the power module during the rowing.