Abstract: A personal watercraft includes a floatation member, a thrust assembly, a steering assembly, and a braking assembly. The assemblies may be actuated either mechanically or electrically. The thrust assembly is human powered, solar powered, or electric powered. The thrust, steering, and braking assemblies can be added after-market to an existing stand-up paddle board (SUP), or built into one or a plurality of SUPs during initial manufacturing. When the thrust assembly is human powered, it is leg or arm powered. When the thrust assembly is leg powered, the legs can move backward and forward in a sliding motion, up and down in a stomping fashion, or move in a loop trajectory. When the thrust assembly is arm powered, the arms can move forward/backward together or separately. The thrust assembly includes one or a plurality of paddles or flippers that are positioned to the side or under the SUP.

Abstract: The ‘Fluke Board’ is a human-powered, hydrodynamic ride-on board/structure, which functions under water but has buoyancy and is operated via the rider's hands or via the rider's feet. The rider thrusts the ‘Fluke Board’ up and down in the water, in the manner of a fluke or flipper, to produce forward motion through the water. The ‘Fluke Board’ therefore has unique features and functions that distinguish it from existing ride-on boards. The ‘Fluke Board’ rider, regardless of their age, experiences fun and exercise, which promote fitness and good health.

Abstract: The watercraft includes: an open rigid frame having a concavity, two rigid oblong floats (11, 12) respectively fastened at the two ends of the frame, extending transversely with respect to the frame, on either side thereof, so as to offer a user a grip for his hands, and seat element (7) serving to support a user positioned astride. The frame is tubular and provided in its lower part with at least one water access orifice (8, 9, 10) and in its upper part with at least one vent (E1, E2) enabling the frame to fill at least partially with water and act as a ballast.

Abstract: A watercraft (10,40, 60, 90, 110, 200, 210, 310) is disclosed which is propelled by at least one pair of pivoted sheets (28, 29) which are reciprocated through the water by a propulsion mechanism (18, 25, 45, 48, 91, 92) which is driven by repeated weight transfer of an operator's body (20). Also disclosed is a hull assembly system (61, 161, 261). The water craft disclosed are particularly suited as pleasure craft able to be transported by a vehicle and operated by many classes of persons including those without endurance or stamina.

Abstract: A sportboard device (10) for movement over a fluid medium, including water, snow, or ice; including a plurality of pivotable fin assemblies (20) for transferring force from the user's feet to the fluid. Fin assembly (20) includes foot platform (30), transmission shaft (51), and fin (21). User stands on foot platforms (30) with feet secured by strap (34), binding (35), or friction surface (36). Twisting the feet pivots foot platforms (30). Torque is transmitted through shaft (50) to fin (21), causing fin (21) to pivot against the fluid medium. Coordinated movements of foot platforms (30) cause sportboard (10) to move relative to the fluid in the absence of gravity, wind, or wave force or in a direction different from that of the natural force.

Abstract: A muscle-powered watercraft includes flotation and propulsion structure having at least two blades which remain rigid under the stresses that are subjected to. The front edges of the blades are hinged about respective axes transverse to the watercraft's axis of propulsion, spaced from one another along the axis of propulsion on either side of the watercraft's center of gravity. Each of these blades extends symmetrically from the axis of propulsion. Abutment structure limits the angle of freedom of each blade about its hinging axis, and the volume of water displaceable by immersion of the flotation structure is selected to correspond to 1 to 2 times the total laden weight of the watercraft. The flotation structure has feet-supporting surfaces distributed about the craft's center of gravity, whereby a driver may impart to the watercraft a sinusoidal movement in and out of the water by pitching the craft and hence making the blades operate in opposition to one another between the abutments.

Abstract: A water vehicle which is actuated by the occupant when alternating their body weight simultaneously upon two buoyant members having simultaneous, alternate, vertical movement means for one end of each member. The movement further actuating a pair of flippers to simultaneously, alternately, actuate between a first and second position, therefore causing forward movement. The Water vehicle further provides steering means which allows the occupant to steer the vehicle by simply twisting their waist. This vehicle is easily assembled, dis-assembled and portable.

Abstract: A propulsion system for a water-borne vessel. There is a generally inflexible fin member. A projection member is connected to the vessel. It has a resilient connecting member attached to the generally inflexible fin member. The projection member is connected to the vessel so as to be held below water along an axis parallel to the water line.

Abstract: An amusement device comprising a boat, for a rider, which is formed of lightweight material, and permits the rider to stand on the boat much like on a surf board and by rolling the boat about its longitudinal axis causing provided fins to flex and form propulsion apparatus for the boat.