Patent ID: 6821169
Filing Date: 2004-11-23
Classification: B63H,B64D,F16H

Abstract:
A drive system for a propeller-driven vessel comprising:an inner shaft having means adjacent an aft end for affixing an outer propeller thereto to achieve rotation thereof; a hollow outer shaft having a longitudinal bore therethrough dimensioned to admit the inner shaft in coaxial relation, the outer shaft having means adjacent an aft end for affixing an inner propeller thereto to achieve rotation thereof; a fore driven gear having teeth, the fore driven gear coaxially affixed to the inner shaft; aft driven means comprising a flexible, continuous member engageable with the outer shaft for achieving corotation therewith; a drive shaft having means for being rotatably driven adjacent a fore end; a fore drive gear coaxially affixed for corotation with the drive shaft and having gear teeth positioned for meshing with the fore driven gear teeth for driving the fore driven gear in a first direction; and aft drive means affixed for corotation with the drive shaft and having means for driving the flexible member in a second direction opposite the first directon.