Patent ID: 6299495
Filing Date: 2001-10-09
Classification: B63H

Abstract:
An airboat transmission for converting an engine drive shaft rotation into coaxial counter-rotations for driving a pair of airboat propellers, the transmission comprising:a fore output gear rotatably affixable within a housing and affixable to an inner shaft for rotating an outer propeller of an airboat;an aft output gear rotatably affixable within the housing and affixable to a hollow outer shaft coaxial with the inner shaft for rotating an inner propeller of an airboat, the aft output gear coaxial with the fore output gear;an intermediate gear shaft having an aft end rotatably affixable within the housing and a fore end having means for being rotatably driven by a drive shaft;an intermediate gear mounted on the intermediate gear shaft, the intermediate gear positioned in driving relation to only one of the fore or the aft output gear; anda drive gear rotatably affixable within the housing and affixed for corotation with the drive shaft, the drive gear having a first portion positioned in driving relation to the intermediate gear and a second portion positioned in driving relation to the other of the fore or the aft output gear not being driven by the intermediate gear.