Multi-function auxiliary rudder system for jet propelled watercrafts

Abstract

A rudder system that uses a dual purpose thrust operated actuator. The actuator is selectively positioned for use in an up or constant down mode. While in the up mode, the actuator uses the force of the jet pump to raise the rudders out of the water at speed, and with the actuator set in the down mode, the invention uses the force of the jet pump water to hold the rudder in the water.

1 . An auxiliary rudder system configured for use with a jet propelled watercraft having a directional nozzle drive system, the auxiliary rudder system comprising:
 a pair of spaced-apart fins, the fins being configured to be pivotally attached at one end to a proximal end of said nozzle drive system so that said fins pivot up or down along sides of said nozzle drive system;   said fins extending in length from said proximal end of said nozzle drive system a predetermined distance beyond a jet water flow outlet of said nozzle drive assembly;   a thrust operated actuator, each end of said actuator being attached to an inside surface of said fins, said actuator further having respective top and bottom surface, said actuator being dimensioned and configured to be subjected to a thrust force caused by a flow of water exiting said outlet;   a side force stabilizer member configured to be fixed to an underside of a directional nozzle of said nozzle drive system, said stabilizer member being oriented transversely such that respective ends of said member are located juxtaposed said inside surface of said fins when said fins are in a down position;   fin rotation stop means for limiting a rotation downwardly of said fins; and   bias means for holding said fins in said down position, said bias means being configured to allow said fins to lift in an up position when an object is struck by said fins.   
     
     
         2 . The auxiliary rudder system according to  claim 1 , wherein fin rotation stop means for limiting a rotation downwardly of said fins is a boss member attached to an inside surface of one of said fins and located so as to contact said side force stabilizer member when said fins are rotated downwardly. 
     
     
         3 . The auxiliary rudder system according to  claim 1 , wherein said system further comprises means for selectively positioning a surface orientation of said actuator such that said top surface of said actuator is constantly subjected to said thrust force of water exiting said nozzle outlet to keep the fins in a down position at any speed or for pivoting and positioning said actuator orientation such that a bottom surface of said actuator is at least partially subjected to said thrust force of water exiting said nozzle outlet to lift said fins in an up position at an operating speed. 
     
     
         4 . The auxiliary rudder system according to  claim 1 , wherein said actuator further comprises opposing bent portions at each end of said actuator, each of said bent portions being in contact with a respective inside surface of said fins, said bent portions of said actuator being attached to said inside surfaces of said fins. 
     
     
         5 . The auxiliary rudder system according to  claim 1 , wherein said bias means for holding said fins in said down position comprises at least one spring having an extended end in contact with a top edge of one of said fins. 
     
     
         6 . The auxiliary rudder system according to  claim 4 , wherein said bent portions of said actuator are pivotally attached to said inside surfaces of said fins. 
     
     
         7 . The auxiliary rudder system according to  claim 4 , wherein said actuator is oriented such that said top surface of said actuator is constantly subjected to said thrust force of water exiting said nozzle outlet to keep the fins in a down position at any speed. 
     
     
         8 . The auxiliary rudder system according to  claim 4 , wherein said actuator is oriented such that a bottom surface of said actuator is at least partially subjected to said thrust force of water exiting said nozzle outlet to lift said fins in an up position at an operating speed. 
     
     
         9 . The auxiliary rudder system according to  claim 1 , wherein said actuator further comprises opposing bent portions at each end of said actuator, each of said bent portions being in contact with a respective inside surface of said fins, said bent portions of said actuator being pivotally attached to said inside surfaces of said fins, said bent portions having means for pivoting and positioning said actuator orientation such that said top surface of said actuator is constantly subjected to said thrust force of water exiting said nozzle outlet to keep the fins in a down position at any speed or for pivoting and positioning said actuator orientation such that a bottom surface of said actuator is at least partially subjected to said thrust force of water exiting said nozzle outlet to lift said fins in an up position at an operating speed. 
     
     
         10 . The auxiliary rudder system according to  claim 1 , wherein opposing ends of said actuator are permanently fixed to said fins and said actuator is oriented such that said top surface of said actuator is constantly subjected to said thrust force of water exiting said nozzle outlet to keep the fins in a down position at any speed. 
     
     
         11 . . The auxiliary rudder system according to  claim 1 , wherein opposing ends of said actuator are permanently fixed to said fins and said actuator is oriented such that a bottom surface of said actuator is at least partially subjected to said thrust force of water exiting said nozzle outlet to lift said fins in an up position at an operating speed.