Control system for a jet propulsion boat

Abstract

A control system for jet-powered boats includes a water jet propulsion group; an ejection nozzle of the water jet oriented to direct the water jet at least in a longitudinal direction; a jet deflector changing flow direction of at least part of the water relative to the longitudinal axis of the boat, the deflector being controllable to progressively adjust the part of the diverted water jet and set a neutral thrust condition, in which the boat is stationary, thrusting forward with variable speed and thrusting backward with a predetermined or variable speed; a control member of the deflector position; a setting member of the deflector that adjusts the deflector to achieve a neutral thrust condition, the deflector being adapted for a predetermined and pre-set neutral thrust position; and a control member of the deflector in the preset position of neutral thrust, canceling any subsequent customization settings.

The invention claimed is: 
     
         1 . A nozzle comprising:
 a body defining a longitudinal axis, the body having a base at a proximal end and one or more lateral walls;   a longitudinal bore defined within the body, the longitudinal bore having an open first end at the base of the body and a dead second end;   a recess defined within the one or more lateral walls, the recess having a bottom and side walls extending perpendicularly to the longitudinal axis of the body; and   a lateral bore defined within the body, the lateral bore fluidly connecting the longitudinal bore to an opening in the recess, the lateral bore having a diameter smaller than a diameter of the longitudinal bore,   wherein the opening is positioned at an apical end of a triangular slit within the bottom of the recess, the triangular slit being perpendicular to the longitudinal axis of the body, the triangular slit further having a base end disposed between the side walls of the recess.   
     
     
         2 . The nozzle of  claim 1 , wherein the longitudinal bore has a proximal portion extending from the open first end and a distal portion joined to the lateral bore, the proximal portion having a larger diameter than the distal portion, a frusto-conical portion connecting the proximal portion to the distal portion. 
     
     
         3 . The nozzle of  claim 2 , further comprising a side bore coaxial with the lateral bore, the side bore extending from the distal portion of the longitudinal bore to an aperture in one of the one or more lateral walls of the body opposite to the recess. 
     
     
         4 . The nozzle of  claim 3 , wherein the side bore is threaded. 
     
     
         5 . The nozzle of  claim 3 , wherein the side bore is configured to receive a plug closing the side bore. 
     
     
         6 . The nozzle of  claim 1 , wherein the bottom of the recess is convex and has a plurality of faces, the triangular slit being defined in a central position within the bottom. 
     
     
         7 . The nozzle of  claim 1 , wherein the body has a multilateral distal portion defined by a plurality of sides and a proximal portion adapted to engage an opening in a nozzle bar. 
     
     
         8 . The nozzle of  claim 7 , wherein the plurality of sides extends from the proximal portion to a distal end of the body. 
     
     
         9 . The nozzle of  claim 7 , wherein the proximal portion is configured to provide a threaded, flanged, quick-connect, or bayonet connection. 
     
     
         10 . The nozzle of  claim 1 , further comprising a notch defined in the one or more lateral walls of the body, the notch extending from a middle portion of the body to a distal end of the body, the recess being defined within the notch.