Abstract: Marine propellers for coupling to a propeller drive shaft may include a propeller hub. A plurality of propeller blades may extend from the propeller hub. A shearable drive assembly may include a drive core. The drive core may include a drive core wall configured to be drivingly engaged by the propeller drive shaft. At least one drive rib may extend from the drive core wall. At least one shear cavity may be provided in the at least one drive rib. A drive sleeve may be drivingly engaged for rotation by the drive core and configured to drivingly engage the propeller hub of the marine propeller for rotation. The drive sleeve may have at least one rib slot receiving the at least one drive rib of the drive core. Other marine propellers with shearable drive assemblies are also disclosed.

Abstract: Damper assemblies suitable for coupling a drive to an output may include a hub for coupling to the output. The hub may include a hub drive sleeve. A drive adaptor may be configured for coupling to the drive. The drive adaptor may include an adaptor shaft disposed in the hub drive sleeve of the hub. At least one continuous circumferential damper member may encircle the adaptor shaft of the drive adaptor. The at least one circumferential damper member may be drivingly engaged by the adaptor shaft of the drive adaptor and drivingly engage the hub drive sleeve of the hub. At least one deformation space may be disposed adjacent to the at least one continuous circumferential damper member. The at least one deformation space may at least partially coincide in circumference with the at least one circumferential damper member. Marine propellers having damper assemblies are also disclosed.

Abstract: Apparatuses for measuring parameters of an object may include an apparatus frame. A rotary table assembly may include a rotary table having a diameter or width and carried by the apparatus frame. The rotary table may be configured to support the object for rotation. A rotary table motor may operably engage the rotary table for rotation. A carriage rail may be carried by the apparatus frame. The carriage rail may be disposed in fixed position relative to the rotary table. A sensor carriage may be carried by and configured to traverse the carriage rail. A carriage drive motor may engage the sensor carriage. The carriage drive motor may be operable to displace the sensor carriage along the carriage rail. At least one displacement sensor may be carried by the sensor carriage. The displacement sensor may have a displacement sensor travel path which passes over and traverses the diameter or width of the rotary table as the sensor carriage traverses the carriage rail.

Abstract: A progressive shear assembly includes a hub configured for coupling to the output, the hub including a hub drive sleeve and at least one torque transfer lug on the hub drive sleeve. A drive adaptor may be configured for coupling to the drive. The drive adaptor may include an adaptor shaft disposed in the hub drive sleeve of the hub. The adaptor shaft may have an aft shaft end and a fore shaft end and tapering from the aft shaft end to the fore shaft end. At least one adaptor lug may be provided on the adaptor shaft. The at least one adaptor lug may have a substantially non-uniform width from the aft shaft end to the fore shaft end of the adaptor shaft. A tensile spring may be formed by selected ones of a plurality of substantially incompressible shear members and a plurality of substantially compressible compression members disposed adjacent to the adaptor shaft between the at least one adaptor lug and the at least one torque transfer lug.

Abstract: Barrel extension assemblies for structural modification of a propeller barrel on a marine propeller include a ring housing having a ring housing interior, the ring housing adapted to detachably engage an interior surface of the propeller barrel at a trailing barrel edge for structural modification of the propeller barrel. Barrel extension methods for modifying performance of a marine vessel are also disclosed.

Abstract: Seal assemblies for a pre-chamber assembly include a pre-chamber body having an outer chamber surface; a pre-chamber tip; a seal covering area carried by the pre-chamber tip; at least one hard seal between the seal covering area of the pre-chamber tip and the pre-chamber body; at least one elastomeric seal between the seal covering area of the pre-chamber tip and the pre-chamber body; a fuel inlet passage in the pre-chamber body; a fuel discharge passage disposed in fluid communication with the fuel inlet passage; and a drill passage in the pre-chamber body adjacent to the seal covering area and aligned with the fuel discharge passage, the drill passage and the fuel discharge passage disposed at an angle other than 90 degrees with respect to the outer chamber surface of the pre-chamber body.

Abstract: A marine propeller with reverse thrust cup includes a propeller hub, propeller blades each having a leading blade face and a trailing blade face provided on the propeller hub and a reverse thrust cup provided in the trailing blade face of each of the propeller blades.

Abstract: A marine propeller with reverse thrust cup includes a propeller hub, propeller blades each having a leading blade face and a trailing blade face provided on the propeller hub and a reverse thrust cup provided in the trailing blade face of each of the propeller blades.

Abstract: A propeller hub assembly having a through-hub exhaust propeller hub characterized by an interior overlap zone defined by the composite interior dimensions of a selected number of conventional propeller hubs and optionally fitted with a removable exhaust ring and/or sized ventilation plugs. The hub assembly of this invention includes specially designed driver adaptors for insertion in the overlap zone of a universal propeller hub and accommodating corresponding conventional OEM factory thrust washers normally used in the conventional propeller hubs. The overlap zone design facilitates installation of the propeller hub assembly on any conventional lower unit outdrive utilizing the OEM factory thrust washers and corresponding driver adaptors. The exhaust ring and sized ventilation plugs facilitate optimum engine exhaust porting through the hub assembly for various applications, such as racing and other high performance operation.

Abstract: A progressive shear assembly which is suitably adapted for connecting a marine propeller to a propeller drive shaft in such a manner that a selected resilience and torsional resistance of the propeller with respect to the drive shaft is achieved. An adaptor shaft provided on the propeller drive shaft drivingly engages the propeller through multiple sets of shear rods each having a selected composition and resilience. In the event that the rotating propeller inadvertently strikes an underwater object, the shear rods absorb the torque shock. Accordingly, the shear rods tend to deform and shear to prevent damage to the propeller and propeller drive train components, and can be easily and inexpensively replaced.

Abstract: A progressive shear assembly which is suitably adapted for connecting a marine propeller to a propeller drive shaft in such a manner that a selected resilience and torsional resistance of the propeller with respect to the drive shaft is achieved. An adaptor shaft provided on the propeller drive shaft drivingly engages the propeller through multiple sets of shear rods each having a selected composition and resilience. In the event that the rotating propeller inadvertently strikes an underwater object, the shear rods absorb the torque shock. Accordingly, the shear rods tend to deform and shear to prevent damage to the propeller and propeller drive train components, and can be easily and inexpensively replaced.

Abstract: Propellers and impellers having multiple recesses or striations which are cast in the low-pressure face of each blade of the propeller and impeller and extend from the junction of the blade with the hub, toward the extending or distal end of the blade. The parallel or fan-like striations define a waffle-like pattern and act as stress relief pockets as they effect optimum uniform cooling of the blade and hub portions during setting of the poured propeller and impeller in the casting mold, to eliminate or reduce the formation of voids in each blade, as well as shrinkage and warpage along that segment of the blades which join the hub.

Abstract: A ribbed impeller for use in a water pump and in marine water pumps in particular, which ribbed impeller is characterized by a hub rotatably mounted on a shaft positioned inside the pump barrel or housing and multiple blades provided on the hub and fitted with ribs of varying location, length, size and character for enhancing the pumping of water through the barrel. In a preferred embodiment the hub is characterized by an open end which tapers inwardly to define a shaft mount end, to which the shaft is attached for rotation of the ribbed impeller. In another preferred embodiment of the invention the pitch of the impeller blades vary proportionally with the diameter of the pump barrel or housing for optimum pumping of the water through the barrel.