Marine propulsion – Screw propeller – Having transmission
Patent
1982-03-18
1983-05-17
Frankfort, Charles E.
Marine propulsion
Screw propeller
Having transmission
440 66, 440 82, B63H 2126
Patent
active
043838294
ABSTRACT:
A high performance speedboat with a planing type hull and incorporating a drive mechanism having a one or two-speed-forward, step-up, V-gear, hydraulic transmission, which connects the engine drive shaft and the propeller shaft in V-drive structure. The propeller shaft extends rearwardly through the boat transom to provide a "thru-drive" system in coaction with a unitary strut and stern steering support assembly for placement on the boat transom. Such assembly includes a planar transom member secured to the boat transom, and a rearwardly extending, generally horizontal, planar structural member secured to the transom member and extending rearwardly of the boat. The structural member is bifurcated and has a pair of spaced rear end portions having rudder support means operatively disposed thereon for receiving rudder assemblies therein. Also provided is a pair of spaced strut support members secured to the assembly and extending downwardly therefrom with each having a propeller shaft support. A pair of elongated open-ended tubes may be disposed on the stern of the boat and extend through the structural member with their lower ends spaced slightly from the propellers and with their upper ends extending above the waterline. When the boat is in acceleration mode, air is drawn from the atmosphere and down the tubes to the propellers and into the propeller stream by the action of the propellers to control cavitation and reduce the torque required to accelerate the propellers. The tubes have valves to control air flow therethrough.
REFERENCES:
patent: 1548917 (1925-08-01), Vincent
patent: 2242642 (1941-05-01), Bogert
patent: 2328939 (1943-09-01), Xiques
patent: 3076204 (1963-02-01), Nowak, Jr.
patent: 3434447 (1969-03-01), Christensen et al.
Allen, Jr. Harry L.
Stewart Michael J.
Frankfort Charles E.
Great Lakes Power Products, Inc.
Sotelo Jesus D.
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