Marine propulsion – Jet drive – Direction control for fluid jet
Reexamination Certificate
2002-03-18
2003-05-13
Avila, Stephen (Department: 3617)
Marine propulsion
Jet drive
Direction control for fluid jet
C440S041000, C114S162000
Reexamination Certificate
active
06561858
ABSTRACT:
The invention relates to an auxiliary system for providing positive steering to marine crafts using jet propulsion systems, typically personal jet driven watercrafts such as jet boats and jet skis.
By way of background, there are two types of jet propulsion systems currently in use. The first type most commonly used is found on personal watercrafts usually referred to as Jet Skis. This type uses a directional nozzle. The nozzle turns from side to side directing water from the jet to change the direction of the watercraft.
The second type is commonly used on Jet Boats. This type of system incorporates a movable hood or cover over the directional nozzle to force the water from the jet below the boat to add reverse thrust and allows the boat to back up. For forward thrust, it is pulled up above the jet nozzle.
In both types, the steering of the watercraft relies completely on the direction and force of the water being expelled from the directional nozzle. This steering method is extremely unreliable as it responds slowly and fails totally if power is reduced or turned off. As a result, there have been many deadly accidents as a result of such watercraft not being able to quickly and positively respond to a need for directional change at any speed, even if engine power is cut off.
The present invention addresses this steering deficiency currently found in existing watercrafts powered by jet propulsion systems by incorporating an auxiliary keel system to dramatically enhance the steering performance of such watercrafts. In normal operation, the keel steering enhances the watercraft's maneuverability with immediate and controlled response.
In operating conditions where the operator reduces the jet power or stalls the engine, the keel steering takes over and the watercraft will steer accurately. Consequently, the present invention makes the operation of jet propelled watercrafts more enjoyable and, more importantly, much safer.
Although the present invention is more fully described hereinafter, in general, the present invention includes, among other features, a combination of keel members attached to a stern section of a hull. The keels are interconnected using tie rods to the directional steering drive assembly. In other embodiments, the keels are instead attached directly to the directional nozzle or incorporated into the manufacture of the directional nozzle as one piece, and where a hood is included in the directional nozzle assembly, notches are included in the keels to allow for full operation of the hood into its lowest position. For the latter embodiments, although one center keel will work, a divergently depending two keel system or a two keel system together with a center keel further enhance the watercraft steering performance.
REFERENCES:
patent: 3244135 (1966-04-01), Meyerhoff
patent: 3961591 (1976-06-01), Fuller
patent: 3982494 (1976-09-01), Posti
patent: 4421489 (1983-12-01), Van Veldhuizen
patent: 6415729 (2002-07-01), Nedderman, Jr. et al.
Watercraft 2002 Catalog by SEA DOO.
Avila Stephen
LaPointe Dennis G.
Mason Law, P.A.
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