A dual drive system for providing motive power to a watercraft has a frame configured for connecting to the watercraft and a drive assembly connected to the frame. The drive assembly has a manual drive mechanism configured for receiving mechanical input from a user, a motor drive mechanism configured for receiving mechanical input from a motor, a driveshaft having a first end in selective engagement with one of the manual drive mechanism and the motor drive mechanism and a second end in engagement with a propeller, and a drive selector for selectively engaging the manual drive mechanism or the motor drive mechanism with the driveshaft based on a position of the drive selector between first and second positions. In the first position, the drive selector engages the manual drive mechanism with a driveshaft. In the second position, the drive selector engages the motor drive mechanism with the driveshaft.

A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turn on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turn on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

A watercraft includes at least one floating member, a central frame supported thereon, first and second foot platforms, and first and second handlebars. The first and second handlebars define elongated configurations and include grasping end portions, intermediate portions pivotably coupled to the central frame, and base end portions pivotably coupled to first end portions of the respective first and second foot platforms. A propulsion system includes an axle assembly, first and second rotating arms, and first and second oars. The rotating arms are fixed relative to one another, pivotably coupled about the axle assembly at first ends, and pivotably coupled to second end portions of the foot platforms at second ends. The oars are engaged with and extend from the foot platforms. The propulsion system cycles the oars approximately 180 degrees out of phase to propel the watercraft while maintaining substantially perpendicular orientation of the oars.

A watercraft includes a hull, an opening extending vertically through the hull, and a support assembly configured to mount a propulsion mechanism to the watercraft. The hull at least partially defines the opening. The support assembly includes a rightward support device attached to the hull, positioned between a forward portion of the opening and a rearward portion of the opening, and at least partially defining a right lateral portion of the opening. The support assembly further includes a leftward support device attached to the hull, positioned between the forward portion of the opening and the rearward portion of the opening, and at least partially defining a left lateral portion of the opening.

A watercraft includes a hull, an opening extending vertically through the hull, and a support assembly configured to mount a propulsion mechanism to the watercraft. The hull at least partially defines the opening. The support assembly includes a rightward support device attached to the hull, positioned between a forward portion of the opening and a rearward portion of the opening, and at least partially defining a right lateral portion of the opening. The support assembly further includes a leftward support device attached to the hull, positioned between the forward portion of the opening and the rearward portion of the opening, and at least partially defining a left lateral portion of the opening.

A vehicle using an action-reaction principle is proposed. More particularly, there is proposed a vehicle using an action-reaction principle, the vehicle being able to be moved forward by reaction that is generated when a propelling member repeatedly slides.

A stand-alone modular removable rudder system for watercraft having a rudder comprising a steering handle coupled to a quick release mechanism adapted to releasably secure said steering handle to said watercraft in proximity to the operator, said system further comprising, a rudder mount adapted to be coupled to the rear of the watercraft by a quick release mechanism adapted to releasably secure said rudder mount to said watercraft, said rudder being carried by a rudder support pivotal about said rudder mount and cables operatively connecting said steering handle to said rudder mount whereby the steering handle can be operated to steer the rudder.

A human driven water propulsion apparatus includes a propeller and a human powered drive coupled to the propeller for driving the propeller. The propeller and human powered drive are connected to and supported by a chassis. Foot pedals are slidably engaged with the helical drive shafts. The helical drive shafts are connected to the propeller through one-way clutches and a gear train such that the propeller is driven by the helical drive shafts when driven by the pedals. In a watercraft application, the chassis is rotatably mounted for rotation between a first position where the propeller is faced in a forward direction and a second position where the propeller is faced in a rearward direction. In a swimmer application, a seat is attached to the chassis by a seat post and straps secure the seat to a user.

A human driven water propulsion apparatus includes a propeller and a human powered drive coupled to the propeller for driving the propeller. The propeller and human powered drive are connected to and supported by a chassis. Foot pedals are slidably engaged with the helical drive shafts. The helical drive shafts are connected to the propeller through one-way clutches and a gear train such that the propeller is driven by the helical drive shafts when driven by the pedals. In a watercraft application, the chassis is rotatably mounted for rotation between a first position where the propeller is faced in a forward direction and a second position where the propeller is faced in a rearward direction. In a swimmer application, a seat is attached to the chassis by a seat post and straps secure the seat to a user.