Patent ID: 9011100
Filing Date: 2015-04-21
Classification: B63H,F04D

Abstract:
1. A propeller ( 1 ) comprising a cylindrical hub ( 2 ) rotatable about an axis; and a plurality of blades ( 4 ) provided radially around the hub ( 2 ), wherein the hub ( 2 ) is made up of a first part ( 2 . 1 ) and a second part ( 2 . 2 ) mounted to the first part ( 2 . 1 ) in the axial direction, wherein the first part ( 2 . 1 ) comprises a plurality of housings ( 7 ) each having a relatively short space ( 5 ) and a relatively long space ( 6 ), the housings ( 7 ) provided circularly around the rotation axis; the second part ( 2 . 2 ) comprises a plurality of protrusions ( 10 ) each having a relatively short extension ( 8 ) and a relatively long extension ( 9 ), the protrusions ( 10 ) provided circularly around the rotation axis, and wherein the first part ( 2 . 1 ) is rigidly mounted to the second part ( 2 . 2 ) by a plurality of connecting members ( 11 ).