Abstract: A propulsive device includes an enclosed type housing for receiving a motor and a spindle. The housing has no openings for preventing water from entering into the housing. One or more magnets are secured to the spindle and rotated in concert with the spindle. A casing is secured to the housing for rotatably receiving a shaft. The shaft has a blade secured to one end and has one or more magnets secured to the other end for acting with the magnets secured to the spindle and for allowing the blade to be rotated by the motor via the magnets.

Abstract: A main sail's mast rope is inserted into a hollow profile, which is aerodynamically designed and hinged by at least one ring around a substantially round mast. The profile can rotate around the mast about 90.degree. on each side. The shape and function of the profile provide an ideal flow curve for air flow over the mast, profile and sail. The inside of the profile can be designed for roller reefing where the sail is rolled up on a stay provided inside the profile.

Abstract: A marine drive unit in combination with a coupling (6) between the engine (4) and the propeller drive unit (2). The unit has a divided flywheel cover (20), the proximal portion (22) of which is joined to the engine and has an axially extending section (25) with a connecting portion (38), which has, as seen in the drawing, an inner profile which is upwardly tapered both longitudinally and transversely to the drive unit. A primary shaft (16) is joined via drive knuckles (15) to the propeller drive unit (2) and is borne in a bearing (28) mounted in a seat (27) in a first end of a bearing holder (26). The primary shaft (16) engages a flywheel (19). The other end of the bearing holder (26) is joined to the distal portion (24) of the flywheel cover. The distal portion (24) has a supporting portion (31) with an exterior profile complementary to the interior profile of the connecting portion (38).

Abstract: A second hull adaptor is provided for use with a jet powered personal water craft. The second hull provides for the craft to be more buoyant and stable even when used by full-sized adults. The second hull has a water induction channel which specifically directs the movement of water through the jet pump thereby increasing speed. It further has angled sides and diverging chines for increased speed and improved handling. An adjustable sleeve surrounds the water exhaust nozzle allowing for further adaption of the craft to water conditions or for specific riding styles. The sleeve may be adjusted so as to be flush with the rear transom to a position fully extend beyond the transom as desired.

Abstract: In a Vee bottom planing boat running chines dry at top speed, running trim angle is increased by reducing wetted planing surface area by removing wetted planing surface at areas of least dynamic pressure and by shifting a portion of the trailing edge of the wetted planing surface forwardly, in combination, until running trim angle is slightly less than porpoising trim angle and such that the boat can be made to porpoise by trimming the drive when the boat is running at 70% to 100% of top speed.

Abstract: A floating device, used as a floating chair, for supporting a user over a body of water and having three sections: first, second and third sections, where the second section includes two bays to cooperatively receive a user's legs when she or he sits down on it. The first section of the floating device includes handle members to hold and maneuver the floating member in the water, and a through opening with a transparent member rigidly mounted therein to permit the user to look through it.

Abstract: A multi-part diving fin includes a blade portion having a tip and a shoe end opposite the tip, the shoe end at least partially defining a foot pocket, and a foot plate formed as a separate piece from the blade portion and having a formation for releasably engaging the blade portion, the foot plate configured so that upon engagement with the blade portion, the foot plate provides a bottom of the foot pocket. The present fin also features a vertical adjustment of the height of the foot pocket, as well as stiffness adjustment for the blade portion of the fin.

Abstract: A system to adjust to the changing draft of ocean-going ships on the aft seal system equipped with several outwardly-directed gaskets and one inwardly-directed gasket, in which, between each two outwardly-directed gaskets a ring-shaped chamber is reserved, to which a feed line for compressed air is connected. Integrated into the feed line is a pressure control mechanism and a discharge channel which can periodically empty into the interior of the ship (bilge), whereby the pressure in the ring-shaped chamber is always maintained slightly below the outside water pressure. The system is characterized by the fact that an electronic draft measurement system is located on the ship's hull to supply electric signals which correspond to the current draft, which signals actuate the pressure control mechanism.

Abstract: A V-shaped multi-cylinder engine is mounted in such a manner that a crankshaft is mounted in a vertical attitude and cylinders are opened into a V-shape in a rearward direction. An intake silencer is mounted above a throttle body which is disposed in front of a crankcase portion of the engine. The intake silencer includes an intake silencing chamber defined by a belt cover which covers a belt of a valve operating mechanism and by a lower wall member. Two left and right air intake pipes extend downwardly from the intake silencing chamber and open into an engine compartment. A single intake-air introducing pipe extends downwardly from the intake silencing chamber and is connected to an upper end of the throttle body. Thus, it is possible to reduce the intake noise of the engine for an outboard engine system.

Abstract: A novel permanent-assembly kayak is disclosed having a framework and a hard skin of dimensionally stable sheet material unified with the framework to achieve strength and mechanical stability greater than that which results from the separate effects of the hard skin and the framework. The component parts may be packaged compactly as a kit that may be shipped and stored in inventory economically; greatly elongated frame members are formed of pipe lengths and cores that are telescopically assembled, each part being short enough for compact packaging. The hard-skin material is intrinsically stiff, yet it is sufficiently yielding to be rolled up in the compact package.

Abstract: A flushing device (30) for the cooling system of a marine drive (10) includes a housing (32) having an inlet (34) for receiving pressurized flushing coolant, an outlet (36) for discharging the flushing coolant to the marine drive cooling system, a pulsation chamber (33) between the inlet (34) and outlet (36), and a pulsation mechanism (40) in the pulsation chamber (38) and receiving the pressurized flushing coolant and imparting a pulsation movement thereto and delivering pulsating flushing coolant to the outlet (36).

Abstract: An apparatus and method for supporting a pregnant user is disclosed comprising, in combination, a fixed support portion having a fixed configuration for supporting a portion of the user, and a variable support portion coupled to the fixed support portion and having a plurality of configurations for supporting a different abdominal portion of the user with each configuration of the plurality of configurations. The fixed support portion comprises a plurality of inter-connected, inflatable, tubular members. The variable support portion comprises a plurality of independent, concentric, inflatable, annular members attached to an independent, inflatable, cylindrical member. The variable support portion is in proximity to the abdomen of a user lying thereon, and the cylindrical member and the annular members are selectively inflated to conform comfortably to a protruding abdomen of a pregnant user. This support apparatus is especially useful as an air mattress and a floatation raft.

Abstract: A number of exhaust systems for watercraft propelled by a propulsion unit contained within a tunnel formed in the underside of the hull. This tunnel has an opening through the side of the hull and exhaust gases are delivered to the tunnel from the engine through an exhaust system having an exhaust opening communicating with the tunnel. Various flow controlling arrangements are provided for controlling the flow through one or all of the openings so as to assist in exhaust silencing without significantly increasing back pressure.

Abstract: A dynamic mode shallow draft ski-toon boat featuring a multi-hulled bottom with water skis mounted thereto is disclosed and described, the ski-toon boat being capable of planing at lower velocities and utilizing substantially less engine power in comparison to conventional hulled boats.

Abstract: An improved rudder for tiller steered sailboats is disclosed wherein a rudder support member is rotatably mounted on an axial support located substantially at the waterline in the aft central portion of a boat. A rudder support guide or track is preferably mounted at a radius defined by the rudder support from the axial support and both supports and locks the rudder support at a desired angle so that the rudder may be maintained at a desired angle with respect to the surface of the water. A spring loaded locking pin preferably locks the rudder support at a desired angle and is attached via a cable to a remote hand release located at the distal end of the tiller for remote operation. A rudder level detection device is also disclosed for use with the present invention which determines the optimum angle of the rudder support of the present invention.

Abstract: Each keel panel for a punt-like boat is formed from aluminum sheet having a relatively low temper/high degree of extensibility and the bow portion is stretched formed over a die in a metal stretching machine. The hull construction of the boat has a keel, chines and gunwales formed from aluminum extrusions, interconnected by transverse ribs, where the keel panels are connected to the keel, chines and gunwales but are not connected to the ribs to permit limited movement relative thereto.

Abstract: An agile water vehicle for travel above and below the water surface, incls a hull having therein a helmsman's compartment, a payload compartment, and a propulsor unit. A rudder assembly is fixed to the hull and includes a cylindrically-shaped (or slightly tapered) tubular member having a rudder thereon and extending therefrom, the tubular member being rotatable. A wing assembly is fixed to and spaced from a bottom portion of the hull, the wing assembly comprising a pair of wings extending widthwise of the axis of the hull, and a flap adapted for disposal in each of the wings and extendible therefrom, the flaps being operable for pivotal movement upwardly and downwardly from the wings. The propulsor unit, the rudder assembly, and the flaps are operable from the helmsman's compartment. A pair of propulsors are disposed on the wings and are rotatable around the spanwise axis of the wings. A pair of differential flaps are mounted on a rotatable axial cylinder or ring with a fixed divider plate therebetween.

Abstract: The water bicycle has three basic components: an elongated floatation board, a propulsion and seat unit which is releasably connectable to a central portion of the board, and a steering unit which is also releasably connectable to the board, in front of the propulsion and seat unit. These two units are respectively inserted into an opening and a bore provided in the board and are releasably locked therein by snap connectors of the self-binding type. Such locking makes the components quicker and easier to assemble and dissemble.

Abstract: A motor mount for attaching a motor, such as a trolling motor, to a boat includes a bracket, a pair of pivotable support arms and a motor support. The bracket may be removably attached to the transom or to the bow of a boat. The bracket, the support arms and the motor support form a 4-bar linkage that permits the motor to be moved between a fully deployed or lowered position and a fully stowed or raised position. As the motor is moved between the deployed and stowed positions, it moves through a first, generally vertical translation phase of motion during which it maintains a generally vertical orientation, and a second, generally pivotal phase, in which it is rotated from the generally vertical orientation to a generally horizontal orientation. An intermediate stowed position is provided just beyond a transition point between the two phases of motion.

Abstract: A radar arch for connection onto a deck or superstructure of a boat adapted to supportively receive various pieces of boat equipment and convertible top components. The radar arch includes an arch member having a generally inverted U-shaped configuration formed of molded inner and outer fiberglass components which are connected together along mating seams. The arch member is generally comprised of a transverse upper portion which spans the boat laterally and downwardly extending side portions which supportively engage the deck or superstructure of the boat. A stiffening enlargement is integrally formed into each upper corner of the inner portion of the arch which greatly stiffens this area to substantially reduce lateral racking of the arch in rough seas. Each of these stiffening enlargements which are unobtrusively contoured and blended into the overall arch configuration, may also be used for mounting boat equipment such as deck lights, speakers and the like or simply as small overhead storage areas.