Abstract: The invention relates to a rotor device, preferably a boat propeller device. The propeller shaft drives, via a planetary gear system, two propellers in the rotational direction of the shaft and one propeller counter to the rotational direction of the shaft. The propellers are dimensioned so that they absorb approximately equal torques.

Abstract: A boat drive has a leg formed by three portions, the upper portion passing through the transom opening and may be preassembled with the inboard engine. Lower leg portions are readily detachable from the upper. The leg has a forward and an aft engine cooling water intake ports. A water pump is supplied water via a channel connected to the aft port which joins a forward port, and another channel lead to the water pump. When the leg is tilted up, aft port is out of water but the channels form a water lock where they join to prevent sucking of air through aft port. The leg includes exhaust passageway through propeller hub, and check valve element moves to close exhaust passageway during reverse. Another exhaust outlet is near or above water level and the exhaust passage leading thereto is closed by a water lock which receives water from a water inlet port in the trim tab. A torsion intermediate shaft drives the propeller through a rubber damping and overload-preventing coupling.

Abstract: An inboard outboard drive is at the housing portion passing through the hull provided for sealing and damped support, with a resilient element with a non-collapsible cross-sectional shape which is subject to a constantly acting compressing force, conveniently generated by the weight of the engine. When cracks occur in the resilient element, the edges of the cracks are pressed together by this compressing force, whereby penetration of water into the hull is prevented or at least rendered more difficult. The invention is suited for application in inboard outboard drives of the S-type as well as of the Z-type.

Abstract: An inboard outboard drive for boats, particularly planing boats, of the S-type comprising an inboard engine and a vertical propeller leg having an upper inboard end and extending through an opening in the hull to an outboard propeller carrying portion. The engine has a horizontal output shaft with a universal joint driving shafting extending through the propeller leg to drive the propeller. The propeller leg for side steering is pivotally mounted in a watertight bearing which is located inboard and is inclined so that the bearing axis, defining the side steering axis, passes through the universal joint. The drive is supported near its forward end on two vibration damping supports mounted in the hull and supporting the engine, and on a resilient damping member mounted in the hull and supporting the projecting portion of a bracket which supports the propeller leg to reduce the lever arm of the propeller thrust.

Abstract: A boat propeller device including an inner hub wall defining an opening for a shaft and having an outer circumferential groove, a partly flexible, elongated and unitary plastic locking member partially located in the outer groove. The shaft has an inner circumferential groove in its surface for partially receiving the locking member therein. An access port enables introduction of the locking member into an inner channel defined by the inner and outer grooves in juxtaposed position. The locking member includes spaced indentations for increasing the flexibility thereof; the oppositely disposed indentations forming reduced cross-sections thereof and defining flexible bridges, and between each two adjacent indentations rigid link members are formed and are of a trapezoid-shape cross-section. One of the terminal link members is releasably affixed to the hub and spline connection blocks rotational movement between the hub and shaft.

Abstract: A method of manufacturing boat parts submerged when in use comprises producing a metallic skeleton structure shaped for easiest production by conventional metal-forming methods, and covering this structure in a mold with an adhering layer or coating of a thermoplastic resin or a rubber-based vulcanizable substance. The inner walls of the mold have high finish and the desired streamlined outer shape of the finished product, such as a lower unit of a propulsion system, or a propeller and the like. The coating functionally neutralizes the technologically conditioned and generally not streamlined shapes of the skeleton structure and provides a protection of the skeleton structure against electroerosive corrosion.

Abstract: An inboard outboard drive having a structural part which passes through an opening in the hull of a boat. A mounting shield for supporting the structural part is at its inner portion provided with symmetrical receiver grooves into which the support flanges on the structural part may be selectively inserted in either one of two reversed positions and has in an outer portion an asymmetrically located flange for securing to the hull. The shield may according to need be put on the inner or outer side of the hull, depending on which of them is more even than the other.

Abstract: A trim and tilt arrangement for an outboard drive includes an elongated support pivoted at their forward ends on the lower part of the rudder post and at their rearward ends interconnected by a connection which with the aid of elongated slots in both side walls of the outboard drive casing passes therethrough. An engagement in the outboard drive engages from behind the connecting means. Trim and/or tilt motion is achieved by either varying the length of the supporting means, or the relative position of the engagement means with respect to the outboard drive and this is accomplished from a remote-control station to the driver. The engagement is releasably secured to the connection by specially adapted locking devices which release in response to lower rearward force in forward drive and higher force in reverse drive.

Abstract: The invention relates to a balance wheel for rotating machines, especially combustion engines, including, for example, outboard motors. Hitherto, such balance wheels or flywheels have been manufactured from different non-ferrous metals as zinc or aluminum alloys, and in one embodiment they have the shape of an inverted pot having low side walls. On the inner side of the walls balance wheel magnets, that is, permanent magnets for the ignition or generator system of the motor, are attached, and the other elements of the ignition or generator systems are disposed outwardly around the output shaft of the engine and inside the "pot". However, for obtaining a suitable magnetic field, the permanent magnets are not attached directly to the balance wheel of a non-magnetic material--zinc or aluminum--but on a ring of magnetic material, for instance steel, which in its turn is attached to the balance wheel.As known, the object of a balance wheel is to act as an accumulator of mechanical energy.

Abstract: The invention relates to a method and mould for the production of a connecting rod or similar object having a body of cast metal, expecially a non-ferrous metal such as a zinc or aluminum alloy, the body comprising a connecting rod shank and of which at least one connecting rod end is provided with a bearing race element of hardened steel, typically an outer race for a roller or needle bearing. The invention particularly pertains to connecting rods having bearing surfaces subject to high loads and which are characterized by the absence of "pockets" in which contaminated lubricant might accumulate. Such connecting rods are, for instance, used in two-stroke combustion engines as for instance outboard motors for boats or the like, with rollers or needles disposed between the said outer race and the journal of the crank shaft throw.

Abstract: A trimming, tilting and transom bracket assembly for a drive leg for a boat including a single tilt pin supportingly carried by a transom bracket, a swivel bracket tiltably carried by the tilt pin steerably supporting the leg, a member carried by the pin interposed between the transom bracket and the swivel bracket, and trim adjusting elements between the transom bracket and such element and trim adjusting elements between such element and the swivel bracket.

Abstract: Universal cast cylinder block module for forming Single and Multi-Cylinder Internal Combustion Engine.

Abstract: An outboard motor mount including an upright T-shaped mounting element swingably supported by a transom bracket, the motor being tiltable on the horizontal beam or arms of the mounting element. The mounting element is adjustable in height and in inclination with respect to the transom and the motor is adjustably linked to the leg of the mounting element to adjust the normal operating angle of the motor.

Abstract: An outboard motor having a removable fuel tank and engine shroud member, quick detachable means for attaching the member to the engine and for permitting removal thereof for use as a portable fuel canister. The member is provided with an automatic valve which closes upon such removal, a manual safety shut off for the valve, and a carrying handle for carrying the motor when the member is attached and for carrying the member as a canister when it is detached.

Abstract: A drive shaft housing for an outboard power leg adapted for attachment to a boat. Inside the housing there are cavities for a cooling water pump and its drive shaft as well as a cavity for a gear with a drive shaft between the gear and the propeller shaft. The housing is die cast in one single piece in which the drive shaft cavity opens upwards and passes into the downwards opening cavity for the cooling water pump.

Abstract: A device for powering a propeller and a cooling water pump by a boat engine via a downwardly directed drive leg, which supports a hollow intermediate shaft for driving the propeller shaft. Between the crankshaft and the intermediate shaft there is arranged a reversible gear device. A shaft for powering the cooling water pump impeller is rigidly attached to the engine crankshaft and rotatably passes through the intermediate shaft to the impeller.

Abstract: In an outboard motor having an engine located above the water level, a lower unit is provided extending downwardly from the engine and includes an exhaust gas tube within the lower unit with its lower end positioned below the water level. Laterally enclosing the exhaust gas tube is a liquid jacket and a heat insulating jacket is positioned between the exhaust gas tube and the liquid jacket for maintaining the temperature of the exhaust gases at a level such that an afterburning of any oil residue in the exhaust gases is achieved before the gases are discharged from the exhaust gas tube.

Abstract: This invention relates to a marine propulsion device having a propeller and a shaft for this propeller, which shaft is made from a unitary body of surface hard steel material and has its inner or forward end connected to driving means in a lower housing and its outer or rearward end extending coaxially into and drivingly carrying the propeller. The outer or rearward end is protected by a sea water resistant sheath.