An oar propulsion system having an oarlock attached to the rear of a standup paddle board (SUP) is used for manual propulsion of the board. The oarlock is structurally attached to the paddle board in a first embodiment, or remains removable in a second embodiment as a conversion kit. The oar shaft has a blade on one end and an exchangeable handle on the other end; the exchangeable handle may be replaced by a waist strap that is tied the paddler’s body for better stability and for steering while paddling.

An oar propulsion system having an oarlock attached to the rear of a standup paddle board (SUP) is used for manual propulsion of the board. The oarlock is structurally attached to the paddle board in a first embodiment, or remains removable in a second embodiment as a conversion kit. The oar shaft has a blade on one end and an exchangeable handle on the other end; the exchangeable handle may be replaced by a waist strap that is tied the paddler’s body for better stability and for steering while paddling.

An oar assembly for a paddleboard is disclosed herein. The oar assembly according to one embodiment, allows the user to propel in a forward as well as a reverse direction. The oar assembly comprises a shaft having a top end and a bottom end. A first geared coupler having a first toothed surface extends from the bottom end of the shaft. A second geared coupler having a second toothed surface is configured to couple to the first geared coupler. An oar blade extends from the second geared coupler. A pair of brackets is configured for assembly on the shaft, the first geared coupler, and the second geared coupler. According to one aspect, a meshing of the first toothed surface with the second toothed surface facilitates hingeable movement between the first geared coupler and the second geared coupler, and thereby between the shaft and the oar blade.

An oar assembly for a paddleboard is disclosed herein. The oar assembly according to one embodiment, allows the user to propel in a forward as well as a reverse direction. The oar assembly comprises a shaft having a top end and a bottom end. A first geared coupler having a first toothed surface extends from the bottom end of the shaft. A second geared coupler having a second toothed surface is configured to couple to the first geared coupler. An oar blade extends from the second geared coupler. A pair of brackets is configured for assembly on the shaft, the first geared coupler, and the second geared coupler. According to one aspect, a meshing of the first toothed surface with the second toothed surface facilitates hingeable movement between the first geared coupler and the second geared coupler, and thereby between the shaft and the oar blade.

An oar assembly for a paddleboard is disclosed herein. The oar assembly according to one embodiment, allows the user to propel in a forward as well as a reverse direction. The oar assembly comprises a shaft having a top end and a bottom end. A first geared coupler having a first toothed surface extends from the bottom end of the shaft. A second geared coupler having a second toothed surface is configured to couple to the first geared coupler. An oar blade extends from the second geared coupler. A pair of brackets is configured for assembly on the shaft, the first geared coupler, and the second geared coupler. According to one aspect, a meshing of the first toothed surface with the second toothed surface facilitates hingeable movement between the first geared coupler and the second geared coupler, and thereby between the shaft and the oar blade.

An oar assembly for a paddleboard is disclosed herein. The oar assembly according to one embodiment, allows the user to propel in a forward as well as a reverse direction. The oar assembly comprises a shaft having a top end and a bottom end. A first geared coupler having a first toothed surface extends from the bottom end of the shaft. A second geared coupler having a second toothed surface is configured to couple to the first geared coupler. An oar blade extends from the second geared coupler. A pair of brackets is configured for assembly on the shaft, the first geared coupler, and the second geared coupler. According to one aspect, a meshing of the first toothed surface with the second toothed surface facilitates hingeable movement between the first geared coupler and the second geared coupler, and thereby between the shaft and the oar blade.

There is described an assembly for holding a beverage container. The assembly includes a beverage holder having a base and one or more sidewalls extending from the base. The one or more sidewalls define with the base a space for receiving a beverage container. The base includes a recess formed in the base. The base further includes an aperture extending from the recess to an exterior of the beverage holder. The assembly further includes a fastener for inserting through the aperture.

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.

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.