Patent ID: 11952091
Assignee: WÄRTSILÄ NORWAY AS
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 13:
14. A method for installing a marine vessel propeller of a built-up propeller (BUP) type circular array of propeller blades, wherein each propeller blade is a single piece having a blade part and a base part, the base part having a generally circular inner surface in which there is arranged 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 cylindrical indents; and a plurality of cylindrical inserts each cylindrical insert provided with a hole parallel to a longitudinal axis of the cylindrical insert and arranged to fit into one of the cylindrical indents, the propeller blades being configured to be attachable to a propeller shaft by at least one fastening bolt, wherein each cylindrical insert has two parallel planes defining a cylindrical insert thickness configured to define a clearance between the base part inner surface and the propeller shaft when tightened for use, wherein the method comprises:
providing the propeller shaft including planar indents on the propeller shaft;
installing the cylindrical inserts into the cylindrical indents and fixing the cylindrical indents to the propeller shaft;
forming a corrosion protective insulation on a remaining exposed propeller shaft outer surface; and
attaching one propeller blade at a time into position by tightening the at least one fastening bolts.