Abstract: A water craft constituted by a fiberglass body with a streamlined bow in back of which is a recess forming a seating compartment. The rear end of the body is formed to provide a keel. Front-to-back guides in the seating compartment support a shiftable seat having dismountable arms that extend laterally to opposite sides of the body to support floats at their ends. In front of the seat, pedals are supplied which are kinematically joined to a central shaft within the body that is connected to a drive shaft that emerges from the body for driving a propeller.

Abstract: A water-craft which comprises a swing assembly including opposed seats and a foot-rest arranged to each make a reciprocative movement and a transmission mechanism to convert the reciprocating movement of the seats into a rotary movement to actuate a paddle-wheel for propelling the craft. The transmission mechanism includes reciprocating pairs of angularly adjustable one-way grippers which grip an endless belt for moving the latter in one direction or in the other or which clear the belt to propel the craft forwardly or rearwardly, or to permit use of the swing assembly while the craft remains stationary.

Abstract: An amphibious pedal powered sailboat apparatus is provided by the present invention. In one embodied form, the inventive boating apparatus comprises in combination a relatively lightweight boat hull having an upper deck portion, a bow portion, and a stern portion; a front pair of wheels mounted on the hull for steering and to provide mobility of the apparatus on land and a rear pair of wheels mounted on the hull to provide traction and mobility of the apparatus on land; a first pedalling stand fixedly mounted in the bow portion of the hull and a second pedalling stand fixedly mounted in the stern portion of the hull; the first and second pedalling stands each comprising a pair of foot pedals mounted for rotational movement about a horizontal axis transverse to the longitudinal axis of the hull; and drive mechanism for coordinating operation of the pair of foot pedals on the first and second pedalling stands.

Abstract: A pedal powered watercraft is disclosed in which a centrally disposed longitudinally extending frame carries a centrally positioned pedal housing having one pedal on each side of said frame with one of a pair of longitudinally extending laterally horizontal boards mounted on each pedal. The frame carries a pair of vertically spaced apart stops constituted by horizontal bars extending outwardly from the frame on each side of the watercraft at the forward end of thereof. The boards extend forwardly of the pedals beyond the bars with these bars being positioned so that the upper bars are below the upper surface of the boards when the pedal carrying the same is at the upper limit of its path of movement, and the lower bars are above the lower surface of the boards when the pedal carrying the same is at the lower limit of its path of movement. This causes the forward end of both boards to point in such a direction that the tilt of both boards moves the craft forwardly when the upper board is depressed.

Abstract: The present invention provides a pedal powered amphibious sailboat apparatus. In one embodied form, the inventive boating apparatus comprises a relatively light-weight hull with peripheral air tanks along the interior walls of the hull, two pedalling stands which translate the rotational movement of the foot pedalling by one or two occupants to a gearing system by means of drive chains, which synchronously causes rotational movements of a screw propeller and a pair of wheels in the rear of the hull. Accordingly, the unique pedal powered sailboat apparatus of the present invention is capable of cruising water with pedal power of the occupants and capable of land transportation without use of a fossil fueled combustion engine or electricity.

Abstract: This device is for aiding a swimmer to obtain more thrust when swimming underwater. Primarily, it consists of a pair of poles secured to a harness, which is worn by the user. It also consists of a plurality of pivotal fins secured to the harness, for increasing the speed of the user, who moves the device by a pair of handle grips secured to the poles.

Abstract: A screw-propelled, water saddle for ride on a water surface. This water saddle is supported by two parallel floats, properly spaced apart and joined by at least one emerging cross-member. A central bar or tubing is fixed parallel to the floats at the middle of the cross-members. The saddle is mounted on the rear part of the central bar approximately at the center of the area defined by the floats while the front end of the same receives a removable propelling and steering device comprising a screw-propeller driven by a pair of pedals and a handle-bar for steering the propeller in a given direction. The rider takes place on the saddle, puts his feet on the pedals and activates the handle-bar to place the propeller in the desired direction. This screw-propelled water saddle is particularly interesting because of its simplicity, lightness, stability, speed and manageability.

Abstract: A buoyant apparatus for transport or amusement which is propelled by a human operator in a standing position. An annular float has a platform secured to its upper side and a plurality of circumferentially spaced fins extending from its lower side. Struts with pontoons are removably connectable to a rotatable mast which extends through the platform. When a human operator strands on an outer ring portion of the platform, the pontoons float in the water and stabilize the annular float in an inclined position, raising the fins on one side of the float out of the water. When the operator walks forwardly, counteracting the torque by holding a paddle against a strut, forward propulsion results. When sufficient skill is acquired, the struts and pontoons are disconnected from the mast, and the operator drags the buoyant paddle in the water to provide balance and counteract torque sufficiently to result in forward propulsion.

Abstract: A watercraft, which is propelled by a swivellable propulsion fin, which extends from its swivel axle parallel to the longitudinal direction of the watercraft and which is swivellable laterally by a drive device. The swivellable propulsion fin is arranged on the stern of the watercraft in the prolongation thereof.

Abstract: A buoyant apparatus propelled by a human operator has a pair of side by side annular floats and a pontoon rotatably mounted at the corners of a triangular frame. A pair of platforms are each mounted on the upperside of one of the annular floats. A plurality of paddles are mounted on the undersides of the floats at circumferentially spaced locations. The rotational axes of the floats converge upwardly, and the buoyancy of the floats is such that a person can be buoyantly supported in the water by the apparatus with the outboard portions of the floats raised out of the water sufficiently to result in forward propulsion when the person rotates the adjacent inboard portions of the floats rearwardly. This rotation may be done by the person engaging and rearwardly pushing the inboard portions of the platforms with his or her feet while sitting or standing. Alternatively, the floats may be rotated through a pedal drive operated by the person in a sitting position.

Abstract: A pedal-operated nautical propulsion device for small craft, such as a pneumatic raft. The device comprises a pedal crank system producing circular motion which is transmitted by a frame-supported mechanism to a holder carrying a paddle to cause the paddle to undergo translation in a vertical plane, whereby the paddle is plunged in the water to propel the craft and then raised thereabove. The mechanism which makes it possible for the paddle to extend well forward of the pedal crank system includes a bar coupled to the system to transmit the motion thereof, the end of the bar being hingedly connected to the end of the paddle holder. Further included are first and second interhinged connecting rods, the end of the first rod being hinged to the bar and the end of the second rod being hinged to the paddle holder to define a deformable quadrilateral structure.

Abstract: A boat comprising a tread drive system including pedals which are adjustable to the size of the operator. An axle extends through the bottom of the boat at the center of the tread system and is connected for oscillating movement therewith, the axle carrying at its lower end a horizontal swing arm. A vertical fin is mounted on the free end of the swing arm for pivotal movement relative thereto. The fin is a flat rigid plate which is tiltable between angular stops. The fin widens rearwardly and is confined by top and bottom baffles. The fin is arranged beneath the center area of the boat between an aft stabilizing fin and a front fin acting as a rudder whose pivot bearing may be coaxial with that of the tiltable fin. The aft stabilizing fin corresponds in size and shape to the rudder and is rigidly fastened to the bottom of the boat near its stern, preferably underneath the seat area for the operator. The boat is steered by a horizontal tiller or steering wheel joined to the upper end of the rudder shaft.

Abstract: A watercraft, which is propelled by a swivellable propulsion fin, which extends from its swivel axle parallel to the longitudinal direction of the watercraft and which is swivellable laterally by a drive device. The swivellable propulsion fin is arranged on the stern of the watercraft in the prolongation thereof.

Abstract: A combined propulsion and support device for use by a swimmer when the device is in a first operating position, but with the device being quickly and easily transformed to a second position in which it is more compact and occupies a minimum of space when in storage or being transported. The device has a further operational advantage that the resilient pair of fins that form a part thereof are fully protected from damage when the device is in the second position.

Abstract: A rocking member is installed in a recess in a device floating on water by a pivot shaft extending approximately parallel to the surface of the water. Such rocking member has a bottom impelling surface displaceable upward and downward by swinging of the rocking member. A plurality of water-trapping wedge-shaped fins, extending approximately parallel to the pivot shaft and spaced apart longitudinally of the device, project downward from the rocking member impelling surface.