A marine vessel propeller to convert engine rotational power into propulsive thrust is of a built-up propeller (BUP) type having a circular array of propeller blades, wherein each propeller blade is a single piece including a blade part and a base part. The base part has a generally circular inner surface with a number of radially extending cylindrical indents provided with planar end wall and fastening holes arranged through the base part at a location of the indents. A cylindrical insert is provided with a hole parallel to a longitudinal axis of the insert and arranged to fit into the indent, such that the propeller blades are attachable to a propeller shaft using exemplary fastening bolts through the fastening holes and inserts. A propeller blade and method for installing a marine vessel propeller are also disclosed.

A marine vessel propeller to convert engine rotational power into propulsive thrust is of a built-up propeller (BUP) type having a circular array of propeller blades, wherein each propeller blade is a single piece including a blade part and a base part. The base part has a generally circular inner surface with a number of radially extending cylindrical indents provided with planar end wall and fastening holes arranged through the base part at a location of the indents. A cylindrical insert is provided with a hole parallel to a longitudinal axis of the insert and arranged to fit into the indent, such that the propeller blades are attachable to a propeller shaft using exemplary fastening bolts through the fastening holes and inserts. A propeller blade and method for installing a marine vessel propeller are also disclosed.

A propeller for a water vehicle is provided, comprising a hub and at least two blades, said blades extending outwards from the hub in the radial direction, and the propeller having a uniform blade distribution. The problem addressed by the invention is to provide a propeller for a water vehicle which allows unwanted generation of noise to be efficiently reduced or avoided. According to the invention, the angular distance between the blade tips of two consecutive blades of the propeller varies in relation to the angular distance between the blade tips of two other consecutive blades.

A propeller for a water vehicle is provided, comprising a hub and at least two blades, said blades extending outwards from the hub in the radial direction, and the propeller having a uniform blade distribution. The problem addressed by the invention is to provide a propeller for a water vehicle which allows unwanted generation of noise to be efficiently reduced or avoided. According to the invention, the angular distance between the blade tips of two consecutive blades of the propeller varies in relation to the angular distance between the blade tips of two other consecutive blades.

To provide a propeller for a boat propulsion apparatus, which propeller is excellent in maintainability including easy assembly and easy disassembly and reliably reduces the impact force caused by colliding with an obstacle and transmitted to the hub and the output shaft of the boat propulsion apparatus. The propeller includes: a shaft sleeve insertably and removably fixed to an output shaft of the boat propulsion apparatus; a plurality of blade components that are individually supported by the shaft sleeve and are arranged at intervals in a rotation direction of the output shaft; and a plurality of dampers disposed in such a manner that each of the plurality of dampers is disposed between adjacent two of the plurality of blade components.

To provide a propeller for a boat propulsion apparatus, which propeller is excellent in maintainability including easy assembly and easy disassembly and reliably reduces the impact force caused by colliding with an obstacle and transmitted to the hub and the output shaft of the boat propulsion apparatus. The propeller includes: a shaft sleeve insertably and removably fixed to an output shaft of the boat propulsion apparatus; a plurality of blade components that are individually supported by the shaft sleeve and are arranged at intervals in a rotation direction of the output shaft; and a plurality of dampers disposed in such a manner that each of the plurality of dampers is disposed between adjacent two of the plurality of blade components.

A propeller. The blades of the propeller are characterized by a blade center axis which corresponds to a generator line of a cone to which the blade, or blade thrust surface, conforms. The propeller hub is fixed to the blade at the root, in line with the blade center axis, such that the hub axis and blade center axis lie in the same plane, and the leading edge of the blade is positioned forward (referring to the upstream direction of movement caused by the propeller) of the trailing edge of the blade.

The invention is directed to a propeller hubcap and method for installing a propeller hubcap which includes attaching a propeller hubcap to main propeller where the main propeller has at least two blades and a shaft and where the shaft has a diameter of from 2.5 inches to 6 inches. The propeller hubcap includes a central body and propeller blades, where the propeller blades are timed with the blades of the main propeller. A thick and thin nut are provided on the main propeller shaft where the thick or thin nut which is positioned further from the main propeller is tapped by multiple holes which have received a fastener. The fasteners attach the propeller hubcap to the main propeller shaft via complementary holes in the central body of the propeller hubcap.

The invention is directed to a propeller hubcap and method for installing a propeller hubcap which includes attaching a propeller hubcap to main propeller where the main propeller has at least two blades and a shaft and where the shaft has a diameter of from 2.5 inches to 6 inches. The propeller hubcap includes a central body and propeller blades, where the propeller blades are timed with the blades of the main propeller. A thick and thin nut are provided on the main propeller shaft where the thick or thin nut which is positioned further from the main propeller is tapped by multiple holes which have received a fastener. The fasteners attach the propeller hubcap to the main propeller shaft via complementary holes in the central body of the propeller hubcap.

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.