Abstract: The watercraft described herein is a surfboard, skim board, dive board, or boat having a propelling fin driven by a standing surfer or boater with an upward and downward stroke which may be used to propel the watercraft by an upward and downward fin motion. The surfboard and dive board in particular are used on water and may be used to ride ocean swells and waves. The surfer or diver stands on the board and moves a vertical handle upwardly and down-ward. The lower end of this handle is pivotally attached to a parallel bar device having attachment means to the board at a forward end of the parallel bar device and having attachment means to a fin at the aft ward end of the parallel bar device. The fin is generally horizontal and is driven thru the water up and downwardly by the standing user and propels the board forward at higher rates of speed than can be achieved by prone-paddling.

Abstract: A system (12) for providing information to a rower of a boat (10). The system includes a display unit (32) adapted to be coupled to the boat for displaying information to the rower and an imaging device (36) in communication with the display unit. The imaging device is adapted to be coupled to the boat for capturing images and relaying the captured images to the display unit for display and viewing by the rower.

Abstract: A recreational watercraft device consisting of a light hull in the shape of a sail board hull and on the bottom a strut hydrofoil assembly. The hydrofoil has a bilateral symmetric plan-form with a pivot connection at the center of the hydrofoil span. The pivot connection joins the hydrofoil to the strut. The strut has a streamline cross-section. The plane of symmetry of the strut is positioned in the plane of symmetry perpendicular to the span of the hydrofoil. In operation the rider stands on the hull and reciprocates the hydrofoil up and down via a strut having a T handle. The elements of the strut hydrofoil assembly comprise a foil, a pivot, a strut, a T handle, and extension.

Abstract: A manually propelled watercraft for transporting a user on water, comprising a buoyant body having a longitudinal axis and a top side and a bottom side disposed adjacent to the water, a track disposed on the body substantially parallel to the longitudinal axis, a vehicle having a bottom side and being slidably coupled to the track and movable to and from first and second positions relative to the body, and a fin coupled to the bottom side of the vehicle and being movable to and from an extended position that is inclined relative to the longitudinal axis and a retracted position that is substantially parallel to the longitudinal axis, wherein when the vehicle is moved from the first position to the second position, the first fin is substantially disposed in the extended position to maximize water resistance for propulsion of the body, and when the first vehicle is moved from the second position to the first position, the first fin is substantially disposed in the retracted position to minimize water resistance

Abstract: A self-propelled hydrofoil device having front and rear foils, a support structure and a steering mechanism. The device is preferably fabricated with a flexible steering and/or support member that permits the drive foil to move in an appropriate manner through water to propel the device forward. Various embodiments are disclosed.

Abstract: A marine propulsion system emulates the fishes swimming motion yet is highly maneuverable as it permits changes from forward to reverse motion while underway. In other aspects, the propulsion system may be designed and optimized for efficient human powered propulsion.

Abstract: A sculling boat assembly is provided to control the traveling direction and drive a boat, and the sculling boat assembly installs a transmission mechanism on two hulls, connects an end of each transmission mechanism to a handle extended from the two hulls, connects another end of each transmission mechanism to a paddle rod extended from the tail of the boat, and connects an end of each paddle rod with an extension of a fin-shape member. Through the transmission of each paddle rod, a user applies a force onto each handle to drive the fin-shape member disposed on each paddle rod for the movements of pushing water outward and enclosing water inward, such that the water resistance is converted into a reaction by the soft and hard materials of the fin-shape member and its extension to drive the boat to move forward rapidly.

Abstract: A collapsible watercraft for personal recreation. The collapsible watercraft includes a tubular frame that has a first portion and a second portion. Each of the portions are generally rectangular and are hingably coupled together allowing them to be folded one portion on top of the other. Two sets of pairs of floatation members are hingably mounted to the frame and are positionable between being adjacent the outer side of the frame for use, and adjacent the inner side of the frame for storage or transit. A human-powered oscillation of a fin member propels the craft. The fin member also serves as a rudder for steering. A foldable seat with a backrest along with a cargo net behind the seat is provided. A canopy is mountable to the frame for protection of the user from the elements.

Abstract: A water driven pedalcraft in which water propelling blades or paddles and a drive mechanism for driving the blades or paddles are associated with a framing system removably mounted atop a buoyant pontoon system. The drive mechanism preferably comprises conventional parts of a bicycle that are operably coupled to flexible and rigid drive shafts, or drive belts, which mechanism transmits torque to drive the water engaging paddle or propeller blades. The pontoon system includes a forward pontoon and a rearward pontoon, the pontoons being movable from a first position, wherein the pontoons are “in-line” with one another, and into a second position, wherein the pontoons are at an angle to one another, when the user desires to steer the watercraft into another direction.

Abstract: The present invention provides an apparatus for propelling a small boat through a body of water by use of a sculling action. The apparatus may be comprised of a vertical stock attached to a vertical surface of the boat, normally the transom. A wide, flexible fin may project outwardly and rearwardly from the bottom end of the vertical stock. A tiller may extend from the top end of the vertical stock towards the bow of the boat. The pumping action on the tiller causes the fin to move back and forth in a sculling action so as to propel the boat through the water. The apparatus may be easily folded into a compact package for storage in the boat either for emergency use or for storage of the boat. The fin may be bifurcated into a plurality of panels for more compact and efficient storage. Plates provided to hold the fin in a vertical orientation may have flanges along their upper edges to provide a step for easy reentry of a swimmer into the boat.

Abstract: Oar, ancient propulsive mean is known many hundreds years ago and is not exchanged until now. Here is offered a new paddle device—a paddle aqua-glider able to exchange oars partially and it is able to expand applicability of manual paddle means much far. The paddle aqua-glider combines ability to glide forward with ability to rise up and to function as a paddle when backward force (such a cord tension) applied to it.

Abstract: A pedal-powered aquatic vehicle is a positively buoyant aquatic vehicle with a lightweight frame and driven flotation wheels on either side of the occupant(s) seat. A pedal drive is incorporated into the lightweight frame to produce propulsion through a chain driven multi-geared system coupled with a drive shaft. Outer drive wheels rotate the flotation driven wheels to propel across water and level ground. Paddles are affixed to the driven flotation wheels. Steering linkages disengage drive wheels independently to provide steering.

Abstract: A feet-propelled water vehicle including a buoyant body having a user-supporting platform attached to a rigid frame secured to a pair of pontoons. A pair of propelling paddles is attached to the rigid frame. Each propelling paddle defines a corresponding effectuating section and a corresponding blade section. The supporting platform defines flexible foot contacting regions for transferring the weight shifting action of an intended user to the effectuating sections of a corresponding propelling paddle. Each effectuating section allows the transformation of the force generated by the foot of the user into a corresponding pivotal movement of the paddle relative to the frame. The blade section attached to the effectuating section allows transformation of the pivotal movement of the paddle into a vehicle propelling force for propelling the vehicle across a body of water.

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: The invention concerns a rigid or inflatable water craft propelled by a double-flipper device for safe displacement both for the user and nearby swimmers. It consists of a floater specifically linked to a propelling system comprising a pedal mechanism with discoid branches (1) with protected pedals (2) actuating two cog wheels (3) secured to two rods (5) connected by pivot pins (4) and sliding in two tubes (6) at the end of which are fixed aquatic flippers (8). The rotation of the cog wheels, acting as a reduction gear box, about the axles (9; 10) fixing them to the outer hull open in its rear part (11) enables to obtain effortlessly a constant and continuous flapping movement of the aquatic flippers in a common vertical plane, such as the one produced by a human and known to be the most efficient. The inventive device is particularly designed for the general public for use in an aquatic environment in the form of nautical activities for leisure, sport or exercise.

Abstract: A water bicycle has a body and a drive system connected to the body. The body is made from a material that allows the body to float on water. The drive system includes a propeller that is positioned below the body, a shaft having a first end coupled to the propeller, a drive mechanism coupled to the second end of the shaft, and a control coupled to the drive mechanism. The water bicycle can also include a steering system operatively connected to the body, the steering system having a rudder, a handle, and a link assembly operatively coupling the handle and the rudder.

Abstract: A personal watercraft that includes at least one stepper. Each stepper is pivotally associated with a propulsion member that is moveable in a generally vertical direction so that the propulsion member is in a first position during downward motion of the stepper and a second position during upward motion of the stepper.

Abstract: A bicycle-type marine vessel including a long, narrow hull unstable in nature, that keeps balance on the water by means of a front rotating keel-propeller system that plays the role of a front wheel on a ground bicycle. The forward location of the keel and propeller permit the operator, sitting on a ground bike type frame, to balance and direct the vessel, while in motion, by means of the handlebar and body leaning. Forward impulse is achieved by leg actuated pedals that transmit power to the propeller placed at the back of the forward turning keel. The balancing force comes from the course change of the hull given by the new keel and propeller direction.

Abstract: A boat having a helical drive mechanism. The helical drive mechanism includes a slider engaged with a twisted screw or a cylinder having a helical slot or groove. The helical drive mechanism is connected to a force input shaft which is arranged within the boat so that it can be driven by the user's feet or hands. The user drives the force input shaft in a rectilinear motion to force the twisted screw or cylinder of the helical drive mechanism to rotate. This force is ultimately transferred to a propeller to move the boat.

Abstract: Efficient human-powered or human-power assisted energy generation and transmission system adapted for use with vehicles. The present invention can be utilized to achieve overall energy transmission efficiency superior to mechanical drives that utilize chains and sprockets or other mechanical drive mechanisms. The present invention can completely eliminate the need for multiple sprockets and the associated shifting mechanisms presently used in most bicycles. By utilizing high efficiency, light weight, direct-drive generators and motors, and an input controller, coupled with an efficient energy storage device, the present invention can reduce the overall weight and complexities of mechanical power transmissions, while, at the same time, offer higher overall efficiencies. In addition, the energy output to the output drive device can be controlled, through profiling and with an output controller, to maintain constant output, independent of instantaneous input.

Abstract: A pedal-powered watercraft comprises a unitary hull having an upper wall extending from a bow portion to a stern portion of the watercraft and a pair of spaced hollow sponsons located on either side of the upper wall. The upper wall together with inner walls of the sponsons form a tunnel that opens generally downwardly and extends from the bow portion to the stern portion of the watercraft. A deck is connected to the hull and includes an elongate opening that defines a cockpit area for receiving an occupant. A seat is located in the cockpit area and a pedal assembly is connected to the hull forwardly of the seat. The pedal assembly includes a pivotal pedal tower and a pair of pedals rotatably mounted on the pedal tower. The pair of pedals are operably connected to drive the propeller during pedal rotation.

Abstract: A water vehicle includes at least first and second foils which are at least partially submersible in water. These foils are movable, at least to a limited extent relative to each other. Repeated movement of the foils generates a propelling force that will move the water vehicle on the body of water.

Abstract: A paddle wheel propulsion device kit is shown which can be removably affixed to a canoe and the like watercraft. A steering unit having a tiller and a rudder shaft detachable from an elbow with a safety cable can be removably attached to the watercraft. A folding and removable paddle wheel fender prevents water entering the watercraft while moving under power. The propulsion power includes a chain drive from a bicycle type mechanism with soft pedals and removably anchored inside the watercraft.

Abstract: An amphibious bicycle intended to be highly efficient, safe and maneuverable forms of both land and water transportation. This achieved by the addition of a strong, rigid frame work, small paddles in the rear wheel assembly, and durable, nonsinkable pontoons of high density styrofoam, made structurally strong and protected by linear outside structural supports sandwiching them. And finally, adding bracing at strategic points to effectively maintain the pontoons' land or water position.

Abstract: A human powered marine vehicle is provided having a rigid front section and a flexible rear section which may be flexed at at least two point therealong. The arms and/or legs of one or more persons in the vehicle are used to power actuators for each flex point, which actuators are operated so as to provide a predetermined relationship, and in particular at least a predetermined phase relationship, between flexure at the various points so that the flexible section moves with a wave or fish-like motion. The person(s) operating the vehicle is trained so as to maintain the predetermined relationship and various techniques are disclosed to assist the operator(s), or otherwise facilitate, the maintenance of the desired relationship.

Abstract: A new leg-powered boat for propelling through water by using one's legs. The inventive device includes a boat portion defined by an open upper end, a closed lower end, forward and rearward ends, and opposed side walls extending between the forward and rearward ends. The closed lower end has an interior surface. The interior surface has a rail that extends a portion of a length of the interior surface. The rail has a channel formed therein extending a length of the rail. A seat portion is slidably coupled with respect to the boat portion. The seat portion has a lower portion and an upper portion. The lower portion has a bracket that extends through the channel. A pulley system has a plurality of pulleys and a cable that extends around the pulleys. The cable is coupled to the bracket of the seat portion. The closed lower end of the boat portion has a track that extends therein from a lower surface of the closed lower end.

Abstract: A floatation device with propeller drive assembly and steerable rudder for use with a ski machine allowing an individual the ability to have a self propelled water craft. The device utilizes a ski machine having a rotating flywheel to provide power for the propeller unit. The ski machine is temporarily mounted to the floatation device with the flywheel in frictional engagement with a drive pulley that transmits power to the propeller unit. A steering mechanism is included to allow the operator to pedal the device across a body of water and back. The ski machine does not require modification and can be easily and quickly removed from the device.

Abstract: In a surfboard assembly, the combination comprises a longitudinally forwardly elongated structure including flotation means, and having opposite ends; and means carried by the structures to support one foot of a surfer or to be manually operated by the other foot of the surfer to propel the surfboard assembly forwardly.

Abstract: The equipment includes a device for floating on the surface of a body of water and for supporting at least one user, and footwear worn by the user for propelling the device through the water. The device for floating includes at least two spaced, parallel, side-by-side pontoons and a frame connected to the pontoons and extending above the space between the pontoons for supporting the user in the space between the pontoons. The footwear includes a foot receiving portion having a foot receiving surface and a second surface opposite to the foot receiving surface and fins extending downwardly from the second surface.

Abstract: A water teeter-totter is provided having a seating member for two or more persons. The seating member is pivotally mounted to a floating, buoyant support member, such as one defined by a pair of pontoons. The seating member is rockable relative to the floating support member by seated persons in a seesaw motion. In an embodiment, a propeller or other mover is operably connected to the seating body and propels the water totter device through the water upon rocking of the seating member relative to the floating support member(s).

Abstract: Apparatus for supporting the human in water includes floats for resting on the water and a structure for supporting the human. A structure is affixed to the floats and the human can use his feet or fins attached to his feet for moving the apparatus in the water. The floats can be two elongated members spaced to either side of a space for accommodating humans or can be at least partially circular to partially surround the human.

Abstract: A human powered mechanism for propelling a wheeled land vehicle, a water vehicle (a boat or hydroplane) using either a water screw or a jet of water or an ultra-light aircraft with an air screw. The mechanism can utilize either arm or leg muscles or preferably, both arms and legs extending and retracting in a manner similar to walking or running as performed from a semi-recumbent position. Steering or other critical control is accomplished through another mechanism which is guided by the appropriate movement of the operator's head. The operators feet are placed on pedals which are attached to swinging members which pivot in a bearing at the upper end. The operator's hands grasp leverage arms which are cantilevered, the distal ends of which are attached to the same push-pull connecting rods as the above mentioned swinging members with foot pedals attached.

Abstract: A human-propelled water bicycle suitable for training or recreative purposes. The water bicycle has two steerable front pontoons and two rear pontoons fixed to a main frame substantially similar to a convention bicycle frame. Handlebars are provided to turn the steerable front pontoons and therefore allowing the water bicycle to be steered. The water bicycle has a pedal mechanism and a bicycle-type transmission powering a propeller located at the rear of the water bicycle.

Abstract: To permit rapid assembly and disassembly of the water cycle so that, when disassembled, it can be stored or transported in minimum space. The cycle, which has at least three flotation bodies (2a, 2b, 2c), which are elongated or torpedo shaped, is formed of tubular frame elements which are coupled together by push-in connectors with spring-loaded pin locks (9, 30, 30', 33, 41) so that individual frame elements (6,7,8; 12,13,14; 24,25) of the cycle can be disassembled into the frame elements, or, selectively, snapped together. The flotation bodies are preferably inflatable and formed with a keel. A pedal and crank arrangement is coupled to a transmission which can drive a propeller or, directly via a chain, a paddle wheel.

Abstract: A pedal operated catamaran includes a pair of side-by-side buoyant hulls, and a rigid frame releasably mounted to the hulls in one of two alternative positions, to maintain the hulls parallel to one another. The catamaran includes a propeller mounted for rotation with an elongated, longitudinal propeller drive shaft. A gear train drivably associates the propeller drive shaft and a crankshaft, for propeller rotation responsive to rotation of the crankshaft. The propeller drive shaft further is pivotally mounted to allow selective alternative latching of the propeller in a retracted position and in one of several operating positions, as controlled by a hand-operated lever. The latching mechanism allows on-the-fly adjustment of the propeller position. In the retracted position, the propeller is automatically angularly locked above the hulls, to facilitate car top carrying of the craft without disassembly.

Abstract: An aquatic ski for human propulsion generated by deambulatory action having a floatable hull and a propulsive oscillating fin assembly. The fin assembly includes a foot seat pivotally connected to the hull and a movable fin in articulated and cooperative connection with the foot seat. The movable fin has a plurality of free oscillating vanes pivotally connected between a pair of parallel arms. The oscillating vanes are movable between a position aligned with the arms and a position transverse to the arms. The hull has a forward portion and a rearward portion pivotally connecting together. The hull includes flotation chambers forward and rearward of the foot seat.

Abstract: The device is an alternative to the conventional paddle or oars, and comprises a collapsible scoop and a handle-shaft. The scoop has top and bottom panels 14,16, hinged together along one edge 18, and side-panels. The side-panels 20 are foldable, and allow the scoop to open and close. When the handle is pushed, the scoop opens out by the action of hydrodynamic forces; when pulled, the scoop collapses. The scoop is made from a one-piece blank cut from stiff plastic sheet. The hinges are formed by locally creasing the plastic material.

Abstract: A self-propelled boat (10) to be used by a boater to maneuver himself along the surface of a body of water, especially in shallow water where the use of a motorized boat or a deep bottom boat is impossible or otherwise impractical. The self-propelled boat (10) includes a body (12) to carry the boater and provide buoyancy. A seat (14) is provided on which the boater may be seated, the seat (14) being provided with a position adjuster (88) for fixing the seat (14) at selected positions along the longitudinal axis of the boat (10). A propulsion system (16) is provided such that the boat (10) may be maneuvered along the surface of the water. The propulsion system (16) includes a pair of foot mounts (146, 148) for engaging the feet of the boater to oscillate selected cords (132L, 132R, 138), the cords (132L. 132R, 138) being connected such as to form a loop. Bow and stern pulleys (98, 106) are provided for holding the cord (132) in place.

Abstract: An all-terrain wheelchair comprising a frame constructed of tubular air-filled frame members to enable the wheelchair to be amphibious. A pair of rear drive wheels are rotatably mounted on the rear of the frame and are controlled by ratchet arms operatively connected thereto. A front wheel is rotatably mounted on the frame at the forward end thereof. If additional floatation is required, floatation tanks may be secured to the frame. A paddle wheel is operatively secured to each of the rear wheels when the wheelchair is being used in the water to provide propulsion.

Abstract: A human-powered boat propelling drive is provided for translating occupant's body weight and variable movements into the power for propelling boat. By coupling the propelling drives, a human-powered boat propelling device is provided which can be propelled and steered by occupant's body weight and movements. By grouping the propelling drives and devices on series or on parallel or mixed parallel series, variable human-powered boat propelling systems can then be provided for a wide range of boat applications.

Abstract: A swimming frame for competition in swimming, swimming instruction, muscle strengthening, and entertainment in the water comprises a pair of floats (1), a clamping unit (2, 3), and a paddle unit (4, 5, 6). It might be used by everyone regardless of the ability to swim. The paddle unit might by modified giving an additional possibility to practice butterfly-like and crawl-like style of swimming. A swimmer being clamped between rigid (2) and flexible (3) portion of the clamping unit is producing the push-pull movements of the paddle unit. When he pushes the unit, the paddle (4) is rotated up to horizontal position by the water pressure against its front. When he pulls the unit, the paddle is rotated up to vertical position by water pressure against its back. Because of the difference in the paddle hydroresistance between push and pull movements the swimming frame will be propelled by the swimmer.

Abstract: A boat-mounted pedal-driven paddle system for maneuvering a lightweight fishing boat. When employed for movement, a paddle is vertically oriented with its blade parallel to the keel of the boat and removably mounted upon the transom by a manually adjustable C-clamp. A pair of cooperating foot pedals are permanently, pivotally mounted upon a crossbar which transverses the width of the boat and is connected between the boat sides. The foot pedals are operatively linked to the paddle system via a pair of flexible cables guided upon a multiplicity of cooperative pulleys and connected to the pedals via a pivotal cable guide donut. Paddle movement involves three basic motions. First, the paddle is rotatable a limited degree about its longitudinal axis, and the position to which it axially rotates determines blade operative pitch during propulsion.

Abstract: An aquatic sports device which includes a buoyant body and a water injection device. The water injection device includes a tank, a piston, and a spring. In operation, the user's weight drives the piston downwardly. This causes water to spray out from the buoyant body through a nozzle. The reaction of the sprayed water makes the device move forward through a body of water. The spring returns the piston upwardly when the user takes his or her weight off of the piston.

Abstract: The present invention relates to a propulsion device for a boat. A manually powered ship wherein a wing-like fin whose front edge is round and rear edge is sharp is mounted on a shaft provided in a direction parallel to the longitudinal axis of a ship so that the fin is positioned in water below a hull, and the shaft is rotated reciprocally by human power to thereby swing the fin to obtain a propelling force.

Abstract: An aquatic wheelchair having a main flotation body of thermoplastic material of closed cell construction including a seat portion and an integral backrest portion. Flotation paddle wheels are connected to the seat portion and a flotation stabilizer wheel assembly is detachably connected to the backrest portion. The flotation paddle wheels are constructed and arranged to facilitate the grasping thereof by the user for manually propelling the wheelchair not only on soft terrain but also in water.

Abstract: A multipurpose and inflatable raft mainly composed of an inflatable circular raft unit, an inflatable shperical raft unit and an inflatable back seat, wherein said circular raft unit comprising several retainer plates for the connection with the retaining rings of the spherical raft unit so as to form a raft of high buoyance, and by means of fixtures attached to the circular raft unit for the fixation of pedalling device to form a pedalling raft, and by means of locating plates arranged bilaterally to the circular raft unit for the fixation of either oar for use in water or braking rod for use in snow-skiing as a braking device.

Abstract: A supplemental propulsion device for a sailboat or sailboard type water craft including a pivotal centerboard. A pair of propulsion wings that are vertically hinged to one-another and mounted to the lower portion of the leading edge of the centerboard of the craft. Upon the application to the centerboard of a reciprocating pumping action each propulsion wing moves inwardly to a retracted position adjacent the centerboard during forward movement of the lower portion of the centerboard and moves outwardly to an extended position removed from the centerboard during rearward movement of the lower portion of the centerboard. Cables connect the free edge of each of the propulsion wings to the trailing edge of the centerboard to stop the outwardly movement of the wings at a point no more than 90.degree.

Abstract: Equipment for towless skiing on water surface includes a pair of propulsion sticks having buoyant members at one end and handles at the other end. The buoyant members provide increased thrust against the hydrodynamic resistance of the water, and the shape of the buoyant members permits removal of the buoyant members from the water with little resistance. The equipment also includes a pair of skis comprised of foam material and provided with stabilizing shoulders on both sides of each ski for minimizing the effect of nose diving and rolling of the skis in the surf. The cross-sectional areas of the buoyant members and of the skis are such that maximum propulsion forces are provided. The skis are designed to endow the surf skier with a greater degree of freedom during surf skiing and to enable the skier to ski for longer distances on the water.

Abstract: The invention relates to a vessel which comprises a floating body upon which a seat for a person is mounted. The vessel is driven by human power through a treadle mechanism which drives a propeller.The treadle mechanism comprises two actuating elements which are each pivotable and are driveable by arms or legs and which are coupled by a driving shaft through a freewheel clutch. By avoiding the death centers which are present in a cycle treadle mechanism, human power is used efficiently.By making the floating body a gliding body the water resistance is reduced, so that together with the efficient propulsion mechanism a high travelling speed through the water is reachable.

Abstract: Apparatus for converting a bicycle to a maneuverable, pedal-operable aquacycle is disclosed. A twin hull assembly includes a support framework for supporting a bicycle by its horizontal frame member. A friction wheel, which may be rotated with the rear wheel of the bicycle by pedal action, turns symmetrically spaced apart, oppositely pitched, twin propellers via dual flexible axles that extend laterally and rearwardly from the friction wheel. An in-line dual rudder control system is provided that, responsive to the turning of the handlebars, efficiently turns the aquacycle in a direction corresponding to the direction a bicycle would turn. Except for conversion hardware consisting of two U-bolts and four nuts, the apparatus is of lightweight, polymeric materials.