SCREW PROPELLER WITH NO SHAFT BOSS AND SHIP THRUSTER USING SUCH SCREW PROPELLER

摘要

TITLE OF THE INVENTIONSCREW PROPELLER WITH NO SHAFT BOSS ANDSHIP THRUSTER USING SUCH SCREW PROPELLERABSTRACT OF THE DISCLOSUREA propeller with no shaft boss comprising a substantiallycylindrical rotatable member and several propeller blade Bextending radially of said cylindrical member close to thecenter axis thereof, and a ship thruster system adapted withsaid propeller having its cylindrical member disposed in asuction and exhaust port formed in the hull, said cylindricalmember being arranged to receive the rotative force froma motor and thereby rotated.