Patent ID: 9676460
Date: 2017-06-13
CPC Classifications: B63H

Claim:
1. A rotatable propulsion unit ( 11 ) for propulsion and maneuvering of a maritime vessel including a nozzle ( 12 ) wherein an electrically or hydraulically driven propeller section ( 13 , 13 a ) is arranged, the propulsion unit ( 11 ) including a fastening device ( 16 ) arranged for arrangement of a steering device for steering or moving the propulsion unit ( 11 ), the fastening device ( 16 ) being formed by two stems ( 17 a - b ) extending in parallel or laterally reversed about a substantially vertical central axis from an upper surface of the nozzle ( 12 ) of the propulsion unit, the stems ( 17 a - b ) extending with equal or decreasing distance therebetween from the upper surface of the nozzle ( 12 ) to a fixing flange ( 18 ) and terminating in the fixing flange ( 18 ) for providing a single connection point for arrangement to the steering device and a joining connection point for cables for energy supply and controlling, hydraulic hoses or pipes, the stems ( 17 a - b ), upper surface of the nozzle ( 12 ) and fixing flange ( 18 ) providing an opening ( 19 ) which assists in improvement of hydrodynamic performance of the propulsion unit, wherein the nozzle ( 12 ) has an inlet and the stems ( 17 a - b ) are arranged a distance from the inlet back on the nozzle ( 12 ) and extend with a curved profile in a direction of the inlet for moving the center of gravity so that a central point through the fixing flange ( 18 ) is positioned in front of the propeller section ( 13 , 13 a ), thereby reducing steering moment which is needed for rotation of the propulsion unit.