Abstract: A variable-pitch propeller, especially for a sport board, has angularly displaceable blade support plates which can be rotated about respective radial axes. The plates are provided with radially inwardly directed claws which engage in circumferential grooves of bases of the blades. The latter can have radial projections reaching beneath the claws. The resulting bayonet connection simplifies mounting and dismounting of the propeller blades even under water.

Abstract: A high-strength hybrid component including a relatively soft first part made of a composite material including an organic matrix reinforced with fibers, a relatively hard second part made of metal, metal alloy, or ceramic, and a transition layer made of a composite material including a matrix of a material that is weldable to the hard part and fibers that are extensions of the fibers of the soft part. The transition layer matrix and the hard part may be formed by deposition of molten material on to the fiber preform of the soft part using flame, electric arc, or plasma. The resin matrix of the soft part is impregnated into the preform and polymerized afterwards. Alternatively, the hard part may be machined to shape and welded to the transition layer before completing the soft part.

Abstract: An impeller has a plurality of rotating passageways which can be defined between adjacent blades, the blades having a curved root portion and able to pivot across a part spherical hub to maintain a fine line contact. The passageways have a convergence to improve the efficiency of the impeller. The hub can be split into two relatively rotating portions, with the blades attached to each portion to provide an efficient means to vary the pitch of the blades.

Abstract: The bow or stern thruster is a steering device for commercial boats or for large yachting vessels. The thruster has a tunnel disposed transversely across either the bow or the stern of the boat. The tunnel has a tunnel flange secured to an opening in the tunnel. A multisection gearbox including a flange, a neck, a foot cap, and a hollow, cylindrical foot is mounted on the tunnel flange with the foot extending into the interior of the tunnel, being suspended by the neck. The gearbox houses a vertical gear shaft extending through the neck into the foot, which drives a pair of horizontal shafts extending through the foot in opposite directions by a spiral bevel gear coupling. The ends of the horizontal shaft are hollow and have a keyway defined therein. The horizontal shafts each receive a propeller integral with a keyed propeller shaft. The propellers rotate in opposite directions. The vertical shaft is driven by a motor or engine housed within the vessel, but outside the tunnel.

Abstract: An adjustable propeller is provided with a receptacle on its hub which is shaped to receive a base portion of a propeller blade. First and second pluralities of alignment devices are provided to allow an operator to select a desired pitch angle and attach the blades of the propeller to the hub so that the desired pitch angle is selected. Alignment devices can comprise a plurality of holes in each receptacle which are tapped to receive a bolt in threaded association therein. Associated holes in the base portion of the propeller can allow free passage of the bolt by selecting one of the holes in the base portion of the propeller and aligning that hole with an associated hole in the receptacle of the hub, an operator can quickly and easily select a desired pitch angle for the blade. A bolt passes through a hole in the base portion of the blade and threads into an associated hole in the propeller hub to select the pitch and attach the base portion to the hub.

Abstract: A controllable-pitch propeller for a sport-type watercraft has a push rod eccentrically connected to each blade displaceable in a bore of the propeller hub. The push rod is sealed with respect to the end of that bore by a multifold bellows whose radial flange is clamped by a cap of an axial flange of the housing in which the bore is provided.

Abstract: An impeller mounting system for a jet propelled watercraft uses an impeller shaft having a tapered portion and an impeller hub having a coaxial opening with a corresponding tapered seat. The impeller hub is tightened onto the impeller shaft so that the tapered portion of the impeller shaft presses against the tapered seat of the coaxial opening in the impeller hub with sufficient force to prevent the impeller hub from slipping with respect to the impeller shaft when the impeller shaft rotates to drive the impeller hub. Static frictional forces between the tapered surfaces bear the entire rotational load for the jet drive, therefore reducing chatter noise and wear which can be caused by load bearing splines or the like. The tapered seat configuration virtually assures proper concentric alignment of the impeller within the wear ring. The impeller shaft also preferably includes a bearing support portion extending rearward from the coaxial opening in the hub.

Abstract: A motorboat propeller comprises a hub and a plurality of blades mounted on the hub. The hub comprises peripherally along the axis thereof a front segment, a midsegment and a rear segment. The hub has a hollow interior provided therein with a shaft tube extending along the direction of the axis of the hub and corresponding in location to the midsegment of the hub. The midsegment has a recessed periphery. Located between the inner periphery of the midsegment and the outer periphery of the shaft tube is a connection portion having a correction end to facilitate the work of correcting the position of the center of gravity of the motorboat propeller. The midsegment of the hub can accommodate a greater amount of water for generating a greater backward thrust of water to propel the motorboat.

Abstract: An auxiliary propelling structure can be attached to an existing propeller system including a propeller having a boss, a propeller shaft and a tightening nut screwed onto the end of the shaft. The auxiliary propelling structure includes an auxiliary boss that is approximately cylindrical to enclose closely the tightening nut of the existing propeller system and having an internal partition with a central through-hole. The partition is pressed against the tightening nut.

Abstract: Disclosed is an apparatus for emergency enablement of a boat propeller. The apparatus includes a central mounting plate having an aperture for engagement with one end of the propeller shaft to which the propeller is attached. A drive plate is affixed to the central mounting plate for drive engagement with the propeller. Upon striking an underwater object, bolts connecting the drive and mounting plate will shear to protect the boat's engine from damage. One or more cantilevered members, the proximal ends of which are fixed around the periphery of the central mounting plate, extend from the mounting plate for disposal within longitudinal spaces of the boat propeller.

Abstract: Disclosed herein is a marine propeller comprising a marine propeller comprising an inner bushing adapted to be mounted on a propeller shaft for common rotation therewith and having an axis and an outer surface, a resilient bushing fixed to said outer surface of said inner bushing and having a cylindrical outer surface extending, when relaxed, at a first radial distance from said bushing axis, an outer bushing having an inner bore defined by a lobular surface having a maximum radial distance from said bushing axis less than said first radial distance, receiving said resilient bushing in a compressed condition and with said lobular surface in continuous circumferentially extending engagement with said outer surface of said resilient bushing, and comprising a series of inwardly concave cylindrical segments, and a series of blades extending radially outwardly from said outer bushing.

Abstract: A propeller has a hub affixed to a propeller shaft so as to rotate therewith. The hub is axially locked by a locking arrangement consisting of a lock nut screwed on to the shaft and a lock screw screwed into the end of the shaft to lock the nut. The screw is tightened more than the nut in order to cause the thread on the nut to load the opposite thread flank on the shaft. A portion of the nut which is deformed during tightening of the screw holds the nut and screw together during subsequent removal of the propeller.

Abstract: A motorboat impeller comprises an axial portion having a through axial hole and having a plurality of blades mounted around the periphery thereof and further having a plurality of retaining slots in the inner wall of the through axial hole. The retaining slots have a predetermined depth and a predetermined length extending from the front end of the axial portion toward the inside of the axial portion along the direction of the axis of the axial portion. A mounting and dismounting element can be disposed in the retaining slots and is provided with a body of a polygonal construction and having a plurality of retaining blocks extending outwards. The retaining blocks are dimensioned to fit into the retaining slots. The body of the mounting and dismounting element can be held firmly with a hand tool to facilitate the turning of the axial portion.

Abstract: A marine spare propeller mounting device used for safely securing a marine spare propeller on board a recreational or work vessel powered by common sterndrive units or large outboard motors. This invention includes a plastic base plate (2) that accepts a stainless steel center axial shaft (3) as well as a stainless steel thrust washer (16) and a retaining knob (4). The stainless steel thrust washer (16) is slipped over the stainless steel center axial shaft (3) and the retaining knob (4) is started on the threaded end of the center axial shaft (18).

Abstract: A motorboat impeller comprises an axial portion, a plurality of blades attached to the periphery of the axial portion, an axial casing, and a nose. The axial portion of a conical construction has a front end with an outer diameter smaller than an outer diameter of a rear end thereof and further has a first axial hole extending therethrough. The axial casing is fastened to the inside of the front end of the first axial hole and is harder in quality than the axial portion. The axial casing is provided therethrough with a second axial hole having in the inner wall thereof a plurality of retaining slots engageable with the splines of a driveshaft. The nose of an elastic material is attached to the front end of the axial portion so that the axial portion has a streamline profile.

Abstract: A lock to prevent theft of a marine propeller assembly having a cylindrical shaped housing on which are exteriorly mounted a series of propeller blades, with the open end of the propeller housing being flared outwardly, the assembly further being mountable to a propeller shaft by means of a retaining nut. The propeller lock substantially covers the open end of the propeller assembly and effectively prevents access to the retaining nut and therefore prevents theft of the assembly. The lock has a flat, generally circular shaped face section, with a relatively short wall depending from the perimeter of the face section. The circular shaped face section is formed of two semi-circular sections with the two semi-circular sections being hinged at an edge so they can be closed to form the circular section or opened to form the two semi-circular sections. The depending relatively short wall is angled at an acute inwardly toward the center of the generally circular shaped face section.

Abstract: A propeller for use on low power motors, such as two-horsepower or less electric trolling motors, is provided with three or more blades on a hub wherein the hub diameter to the blade length (i.e. the length of the blade from the hub to the outermost tip) is in the ratio of at least 1.250 to 1. The hub diameter to blade length ration is such as to produce a propeller having increased performance and is substantially weedless. The width of each blade at its root is equal to or greater than the blade length and the ratio of the sum of the widths of the blades to the circumference of the hub is approximately 1.2 to 1. The true or actual pitch of the blades is measured at 0.7 the radius of the propeller and produces the best results as far as performance and weedlessness is concerned within the range of 2" to 7". The leading edge of one blade forms a junction with the hub in close proximity to a plane containing both the longitudinal axis of the hub and the junction of the trailing edge of the next adjacent blade.

Abstract: A water jet propelled boat is equipped with a water intake opening, a water jet outlet, and with a mixed flow type impeller, where the above mentioned water intake opening and the above mentioned water jet outlet are connected by a water passage with the impeller in the middle of the water passage, and where the operation of the impeller causes water to be drawn into the water intake opening and expelled through the above mentioned water outlet to propel the boat. The impeller structure is such that a boss section of the impeller has a plurality fins affixed to it, the outside edges of the above mentioned spiral fins are roughly parallel to the axial center of the above mentioned boss, and, the leading and the trailing edges of the fins, with respect to the axial center of the above described boss, slant down toward the above mentioned water outlet opening. At the same time relative speeds, the invention allows a smaller diameter fin unit and, at speeds of 4,000 rpm and over, it offers improved efficiency.

Abstract: A shock absorbing hub for a marine propeller assembly includes an inner spindle telescoped onto the splined drive shaft of the engine, an outer sleeve spaced radially outwardly of the spindle, and a molded-in-place core of elastomeric material filling the space between the spindle and the sleeve to transmit torque between the two while cushioning torsional shock. A housing carrying propeller blades is keyed to the outer sleeve and may be removed therefrom for repair or replacement without taking any retaining components off of the drive shaft.

Abstract: A weed resistant boat propeller is disclosed. The propeller includes a generally circular hub that is adapted for mounting to and being rotatably driven by a boat motor. There are a plurality of blades mounted to a circumferential surface of the hub and extending therefrom in a spiral configuration. Each blade includes a curved leading edge that has an arc dy/dx<1 for the entire length of the leading edge.

Abstract: A marine propeller including an inner hub to receive a driving connection to the engine and an outer hub is spaced outwardly from the inner hub to provide a passage therebetween for the discharge of exhaust gas from the engine. A plurality of blades extend outwardly from the outer hub. A propeller is die cast from an aluminum alloy and as cast the outer surface hub is cylindrical in configuration. After casting the trailing end of the outer hub is swaged outwardly by a tapered tool to provide an outwardly flared trailing end, which assists gas flow and enhances performance of the engine.

Abstract: A controllable pitch marine propeller includes a hub body having a forward section provided with holes for bolts and locating and torque pins and a frontal surface that mates with a hub flange and an internal flange that defines an annular cavity and receives a cup-shaped cross-head. A hub flange and propeller shaft assembly comprises separate hub flange and shaft members joined by at least one weldment formed in a tapered weld cavity and protected by a liner shrink-fitted on the perimeter of the hub flange and a removable plate sealed to the hub liner and the shaft liner.

Abstract: A marine propeller theft deterrent system is designed for use on a conventional propeller assembly. The system comprises an annular ring component which fits onto an end portion of the propeller's drive shaft and abuts against a hub of the propeller assembly. The annular ring component has an annular groove around an outer periphery of its inside face and a set of upstanding cantilevered springs spaced thereon inside of the annular groove. A rounded cover component has an open end dimensioned to fit over the cantilevered springs and an end wall dimensioned to fit into the annular groove of the annular ring component. When properly positioned, the rounded cover component is in locking engagement with the annular ring component. As such, a retaining nut for the propeller hub is concealed and access to it rendered difficult.

Abstract: Apparatus for emergency enablement of a boat propeller. The apparatus comprises a central mounting plate having an aperture for engagement with one end of the propeller shaft to which the propeller is attached. A plurality of cantilevered members, the proximal ends of which are fixed at spaced intervals around the periphery of the central mounting plate, extend perpendicular to the mounting plate for disposal within longitudinal spaces of the boat propeller.

Abstract: A waterproof structure for a fan motor comprising a vertical motor shaft projecting from the lower surface of a motor yoke and a fan boss portion which has a bottomed cylindrical shape formed by a bottom opposite to the lower surface of the motor yoke, an outer cylinder opposite to the outer periphery of the motor yoke and which is mounted on the motor shaft at the center thereof. The bottom of the fan boss portion, opposite to the lower surface of the motor yoke is partitioned by concentric circular ribs to form a plurality of enclosed rooms having floors which are successively lower in the direction toward the outer periphery and notches for allowing the adjacent enclosed rooms to communicate with each other are formed in the ribs in such a manner that the notches of the adjacent ribs are offset from one another so as to be placed on different radial lines.

Abstract: A propeller hub assembly comprises a driven member having an outer cylindrical housing and an inner cylindrical housing. The inner cylindrical housing is coaxially fixedly coupled and radially spaced from the outer cylindrical housing, and includes a plurality of radially inwardly directed circumferentially spaced ribs oriented parallel to an axis of the inner cylindrical housing. The propeller hub assembly further includes a driving member which comprises a cylindrical member having an axis of rotation. An opening passes through the driving member coaxial with the axis of rotation and is adapted for receiving a drive shaft. The driving member further includes a plurality of radially outwardly extending ribs oriented parallel to the axis of rotation and terminating radially at a diameter substantially equal to an inner diameter of the inner cylindrical housing.

Abstract: A marine propulsion system of the type having a sacrificial anode for corrosion protection of the casing includes structure whereby the propeller is electrically insulated from the casing and the sacrificial anode. The structure includes spacers made of insulating materials, spacers having insulating coatings, or insulating coatings on the surfaces of the propeller or the propeller shaft. Electrical insulation of the propeller prevents unsightly and efficiency-reducing depositions on the propeller surfaces and reduces the required size of the anode.

Abstract: Each blade includes at its root a root portion that slides axially into a re-entrant cavity that extends axially in the hub. End caps prevent axial removal of the blade roots from the hub. Thus, it is possible to replace an individual damaged blade, and the hubs are interchangeable from ship to ship, although the blades may vary slightly. All of the parts are injection molded of a high-strength fiber-reinforced plastic. The entire assembly can be produced at approximately half the cost of conventional metal propellers. The propeller is intended for use with engines developing 90-250 HP, and the diameter of the propeller is 16-18 inches. The various parts includes apertures and passages so as not to interfere with the discharge of exhaust gases.

Abstract: A variable pitch marine propeller comprising two removable symmetrical propeller blades with cylindrical bases each having a drive lug attached proximate the driving edge of the point of attachment of each blade. A coupling are associated with the drive lugs of the bases and structured to hold the blades by the bases to align and simultaneously rotate the pitch of the blades in equal and opposite directions in response to movement of the coupling. A hub sub-assembly encases the coupling and bases of the blades to allow the blades to pivot and assume a forward or rearward pitch. The hub sub-assembly has a front end, and a rear end capable of mounting onto a drive shaft. A spring is associated with the coupling to initially position said coupling in a position which holds the blades in a rear pitch configuration.

Abstract: In a marine drive having a tapered propeller shaft section (14) and a tapered propeller hub (20, 60) matching and fitting therearound in flush contact, a relief inner diameter section (28, 66) is provided in the hub, spaced from the propeller shaft, to prevent flush contact and facilitate removal of the propeller hub from the propeller shaft. In a further embodiment, a thrust collar (50) with a substantially steeper tapered section (56) further facilitates removal.

Abstract: A shaft pressure ring for use in conjuction with a boat having an inboard motor and a drive shaft protruding through a shaft logseal assembly mounted in the hull of the boat, the hull including a shaft log area surrounding the drive shaft, the shaft pressure ring comprising a deflector, the deflector having an inside diameter being annular in shape, the deflector being of a rigid material and adapted to be positioned upon the drive shaft a sufficient distance from the seal such that the shaft pressure ring will deflect a portion of the water passing beneath the hull of the boat in a direction toward, and onto, the shaft log seal. The splasher will continuously lubricate and cool the shaft log seal to prevent drying, burning, deterioration, and eventual leakage.

Abstract: Disclosed is a marine propeller for inboard, outboard, or inboard/outboard motors. The propeller is made from a non-metallic composite material that will not deform or deflect even at very high horsepower or RPMs. At the same time, the propeller is substantially less expensive than traditional metallic propellers. An especially unique feature of the propeller is that, unlike metallic propellers, it will shatter when it strikes a solid object in the water, thereby avoiding the engine and drive line damage that occurs when rigid metallic propellers strike a solid object. Also disclosed is a coupling member that permits the propeller to be adapted for use with most inboard/outboard motor configurations.

Abstract: A hub assembly comprising a driver telescoped within a driven member is disclosed. A plurality of elastomeric members are disposed between the driving and driven members within mating parallel semi-circular grooves in the opposed surfaces of the driving and driven members of the hub.

Abstract: The invention relates to a method for preventing leaks in a propeller shaft bearing arrangement including a plain bearing (2), which is lubricated with oil or water and which supports the propeller shaft (1) extending through an opening in the body (4) of a hull, and packing members (6,7) for keeping the lubricant in the lubrication space and for preventing water from entering the bearing arrangement. According to the invention, the pressure vibrations occuring in the lubricant are equalized arranging, in the lubrication space, a medium possessing a high compressibility, which medium by means of changes in volume receives and equalizes said pressure vibrations.

Abstract: A marine emergency spare propeller kit includes a plastic floating spare propeller (4) mounted on a carry handle (20) having an axial shaft (22) extending through the propeller hub (10) and retained thereon by a plastic floating nut (8) which is threaded identically to the propeller drive shaft (6) of the marine drive (2). Carry handle 20 also conveniently transports the damaged propeller after replacement by the spare.

Abstract: The invention relates to a method for preventing leaks in a propeller shaft bearing arrangement including a plain bearing (2), which is lubricated with oil or water and which supports the propeller shaft (1) extending through an opening in the body (4) of a hull, and packing members (6,7) for keeping the lubricant in the lubrication space and for preventing water from entering the bearing arrangement. The pressure vibrations occuring in the lubricant are equalized by arranging, in the lubrication space, a medium prossesing a high compressiblility, which medium through changes in volume receives and equalizes said pressure vibrations.

Abstract: An apparatus and method for forming a fluid-tight seal at an aperture where a rotatable shaft passes through a barrier into a barred fluid. A mechanical seal is mounted on the rotatable shaft. A stationary portion of the mechanical seal is elastomerically joined to the barrier by an elastomeric joint to form a substantially fluid-tight chamber bounded by the mechanical seal, the elastomeric joint and the barrier. The stationary portion of the mechanical seal is sealingly positioned adjacent to the rotatable portion of the mechanical seal. The elastomeric joint absorbs relative radial and axial motion between the barrier and the mechanical seal. The chamber is flushed with a flushing fluid. The stationary portion of the mechanical seal is rigidly anchored to the stationary shaft drive housing. The rotatable portion of the mechanical seal is attached to the rotatable shaft at such a distance from a stationary drive shaft housing that the resistance of the shaft to radial deflection is substantially maximum.

Abstract: A device is described with two flat bars that link around an outboard motor housing and connect to a blocking cylinder to prevent rotation or removal of a propeller.

Abstract: A centrifugal pump having a split impeller which is directly mounted to an existing drive shaft and which is enclosed within a housing which is mounted in surrounding, spaced and non-contacting relationship with respect to the impeller and drive shaft so as to form annular fluid inlet openings between the housing and drive shaft through which fluids are directed by the impeller to an outlet from the housing.

Abstract: A lock assembly for securing nuts to rotatably driven shafts in which a generally U-shaped locking spring is mounted with one leg thereof disposed along an opening in the rotatably drive shaft or a component keyed to the shaft and the other leg thereof disposed through and beyond a hole in the nut with a tab portion of such leg extending perpendicularly of the hole so that the tab will be urged outwardly of the hole by centrifugal force as the drive shaft is rotated to thereby create a more secure engagement of the locking spring with the nut.

Abstract: An anti-theft device for a marine propeller has a spinnerplaced over the propeller nut which secures the propeller to the propeller shaft, and the spinner is held in place against unauthorized removal by a lock pin projecting from the propeller nut into an annular recess in the spinner, enabling the spinner to spin freely relative to the propeller nut while capturing the spinner against axial movement which would expose the propeller nut for unauthorized wrenching, the spinner including a radially extending access passage for gaining access to the lock pin with an authorized drive member to move the lock pin out of the annular recess for selective release of the spinner from the propeller nut and authorized access to the propeller nut for wrenching.

Abstract: The marine propulsion device lower unit includes a housing having a lower portion submerged in water and defining an internal passage communicating with the water. Corrosion protection for both internal and external parts of the lower unit is provided by a sacrificial, galvanic-type anode mounted on the submerged portion of the housing and including a first or outer portion having a surface exposed to water exterior to the lower unit and a second or inner portion having a surface exposed to water present in the passageway.

Abstract: A marine propeller locking device for securing a propeller to the drive shaft of a marine engine. The locking device includes a suitable retaining nut, exterior cover covering the retaining nut and preventing access, and a retaining bolt for mounting the cover on the retaining nut. A cylindrical surface is provided on the end of the retaining nut which compliments a like surface on the interior portion of the cover. A pair of O-rings are suitably mounted on the surface of the retaining nut and allow the cover to turn with respect to the nut yet maintaining a waterproof seal therebetween. The O-rings are spaced longitudinally a suitable distance to provide transverse support and stability for the cover. The head of the retaining bolt has a specific groove pattern which is matched by a companion wrench so that the bolt cannot be removed by an unauthorized person using common ordinary tools. A cap having a waterproof seal is positioned over the end of the cover so as to seal the internal cavity.

Abstract: A weedless propeller comprising a major hub having a plurality of propeller blades. The rearward end of the major hub is bluntly terminated immediately aft the trailing edge of the blades at the root of the blades. A secondary hub is connected to the forward end of the primary hub. The junction between the forward end of the secondary hub and the shroud of the engine or motor driving the propeller is spaced a substantial distance from the major hub and blades. Preferably, the diameter of the primary and secondary hub is the same, with the diameter of the forward end of the secondary hub being substantially equal to the diameter of the shroud of the motor to create a streamline flow of water along the shroud and along the secondary and primary hubs.

Abstract: An inexpensive injection molded propeller for mounting on a drive shaft. The drive shaft is attached to the hub of the propeller by a chemical and thermal shrink fit and by deformation due to the rotational forces of the propeller thereby producing a positive locking hub on the drive shaft. The propeller may be used, not only for remote piloted missiles and aircraft, but can also be used with different types of boat inboard and outboard drives, vehicles and equipment requiring a propeller having a positive locking system for securing the propeller or the like to the drive shaft.

Abstract: An auxiliary hub device for use in combination with a propeller of an outboard drive marine engine, the device basically comprising a sleeve which is attachable in interconnecting relation between the engine's drive shaft and the outboard propeller. The auxiliary hub device is used as an emergency connector so as to enable an outboard drive marine engine whose propeller has sheared from the drive shaft to make way in the water.

Abstract: A protector kit for the outboard end of a marine propeller shaft including a reusable brass fastener sandwiched between a sacrificial anodic zinc nose piece and the end of the shaft. The brass fastener serves as a jam nut for the propeller and includes a deformable member and a set screw cooperating with one another to hold a propeller and the nose piece assembled to the shaft. The cup-shaped nose piece is formed solely of zinc and its internal threads hold it securely assembled to the brass fastener by an interference fit between the nose piece threads and the shallow inboard end of the brass fastener threads.

Abstract: This invention relates to marine propulsive devices, wherein the propeller drive shaft is dismantled outwards. The herein-proposed marine propulsive device comprises a propeller drive shaft carrying at one end a screw propeller that has a hub with radial holes to hold the propeller blade roots, the propeller hub being made as a sleeve fitted onto the propeller drive shaft extension in such a manner that a free space is defined between an end portion of the sleeve and the butt end of the propeller drive shaft, the space being communicated with the hub outside surface and adapted for feeding a liquid under pressure thereinto in the course of hub dismantling; each of the radial holes in the screw propeller hub is open-ended, and a socket coaxial with its respective hole is provided in the propeller drive shaft, the socket being adapted for holding the end of the propeller blade root.

Abstract: The invention concerns a marine propeller support arrangement, in which the center of gravity of the propeller is substantially coincident with the geometrical center of the aftermost stern-tube bearing, which bearing substantially supports the weight of the propeller. The propeller may be driven from its after end by means of a drive plate detachably secured to both the propeller and the propeller shaft. The bearing may be furnished with oil pockets and supplied with pressurized oil. An auxiliary emergency bearing may be provided in the propeller bore.

Abstract: For use with a marine propeller which is mounted on an output shaft of a power source, a marine propeller lock comprising a fastener on the shaft for preventing axial movement of the propeller on said shaft and a cover member having a portion thereof engaging the end of the shaft and another portion thereof surrounding the fastener on the output shaft. The fastener has an opening in the end thereof projecting beyond the end of the shaft and the cover engages the shaft and has an opening therein aligned with the opening in the fastener. A lock is insertable through the opening in the cover into the opening in the fastener and has interengaging means thereon engaging the fastener to hold said cover in position and thereby prevent access to said fastener.