Variable venturi

Details Variable venturi Variable venturi

1996-06-11

1999-01-26

Basinger, Sherman

Marine propulsion

Jet drive

Having means to increase fluid drive means efficiency

60221, 23926517, B63H 1110

Patent

active

058632298

ABSTRACT:
The invention relates to a variable venturi for a watercraft vehicle or similarly powered vehicle which allows the operator of the vehicle to selectively choose to operate a watercraft vehicle for achieving maximum acceleration or, alternatively, maximum top end speed. The venturi is comprised of a collar surrounding the venturi adjacent to a distal end of the venturi. At such time as the collar is activated, exposing the water flow exiting the venturi to atmospheric pressure, the diameter of the water flow exiting the venturi is reduced by approximately 1.0 mm. to 1.5 mm. in radius. This slight change in the surface area of the water flow provides a lower mass flow of the exiting water with an increased velocity of the water and top speed of the vehicle. Alternatively, a larger diameter venturi provides a higher mass flow with a decreased velocity and maximum acceleration. In a preferred embodiment, the vehicle comprises a means for allowing the rotation of the engine or the pressure of the water flow to activate an actuator means for altering the surface area of the water exiting the venturi. The preferred embodiment is comparable to automatic shifting of a transmission for a conventional land vehicle. In an alternative embodiment, the collar may be manually controlled by an operator of the vehicle to modify the surface area of the water flow exiting the venturi, thereby allowing the vehicle to achieve maximum acceleration.

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Carl Camper, "The Squirt Gun," Watercraft World, Jul. 1996, pp. 143-149.
Charles Plueddeman, "Blazing Away," Boating, Feb. 1996, p. 90.

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