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, while 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.

A Cantilever Beam Linkage is disclosed for a mechanism and structural support to power and control a cantilever beam in reciprocal motions, by adopting and using planar 4-bar parallelogram linkages, typically for drive mechanisms, into mechanisms to function as guided roller supports, free to translate but fixed for rotational motions; and as load separators where forces and moments are separated. A Cantilever Beam Linkage is applicable for a cantilever beam in reciprocal motions to have its powering and controlling applied forces confined within narrow bodies, to have the cantilever beam extends out multiple times the narrow body width, and to have applied forces equal to response forces; and is particularly suitable for applications such as: a rowing boat oar and a flying machine flapping wing.

A paddle mount for a boat is described. The mount includes a generally t-shaped tubular body including a flange and a stem, where the length of the flange and the stem is adjustable and the ends of the flange are configured to rest on opposite sides of the boat cockpit. The mount is configured to couple to the front end of the cockpit and to an end of the stem, such that the t-shaped body may be rotated upwards away from the boat. A mount adapter is also described that may be used to attach a paddle to the boat using the mount.

A paddle mount for a boat is described. The mount includes a generally t-shaped tubular body including a flange and a stem, where the length of the flange and the stem is adjustable and the ends of the flange are configured to rest on opposite sides of the boat cockpit. The mount is configured to couple to the front end of the cockpit and to an end of the stem, such that the t-shaped body may be rotated upwards away from the boat. A mount adapter is also described that may be used to attach a paddle to the boat using the mount.

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.

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.

A row boat for rowing training includes a hull including a bottom and four sidewalls, and a pair of oars connected to opposing sidewalls, each oar including a handle and an oar scoop disposed as an end of the handle, wherein the oars are configured to rotate about a first axis of rotation to move the oars during a pull phase and a flex phase of a rowing stroke, and wherein the oars are configured to rotate about a second axis of rotation to change an angular orientation of the oar scoop in water during the pull phase and the flex phase.

A force measurement device capable of wirelessly transmitting information about strokes produced by a rower rowing a boat. The device itself attaches to an oarlock without requiring any modification to the oarlock, riggers, or boat. One device shall be required per oarlock. The device may be self powered or utilize an energy storage device. The device will transmit the information gathered by the sensors via wireless communications to a smart device in the boat or a nearby location. This smart device will display the information in a manner easily interpreted to the user, store received data and transmit the data.

A force measurement device capable of wirelessly transmitting information about strokes produced by a rower rowing a boat. The device itself attaches to an oarlock without requiring any modification to the oarlock, riggers, or boat. One device shall be required per oarlock. The device may be self powered or utilize an energy storage device. The device will transmit the information gathered by the sensors via wireless communications to a smart device in the boat or a nearby location. This smart device will display the information in a manner easily interpreted to the user, store received data and transmit the data.