Outboard jet drive marine propulsion system with increased horsepower

Abstract

An outboard jet drive marine system for a boat comprising a housing. The housing is adapted to be affixed behind a hull of a boat. An engine is disposed within the housing. A jet drive unit is mounted to the housing in parallel to and vertically oriented to the engine, and is operatively coupled to the engine. The engine has an exhaust and cylinders, and a turbocharger operatively coupled between the exhaust and cylinders. The turbocharger has a housing for receiving the exhaust and a turbine assembly. The exhaust rotates the turbine assembly. The turbine assembly provides compressed air to the cylinders. The housing has a diameter dimensioned to control the exhaust gas volume and speed to optimize the turbine speed of the turbine assembly to reduce back pressure. The fuel is cooled as it exits the engine.

1 . An outboard jet drive marine system for a boat comprising: 
 a housing, said housing adapted to be affixed behind a hull of said boat;    an engine disposed within said housing; and    a jet drive unit mounted to said housing substantially in parallel to and vertically oriented to the engine, and being operatively coupled to said engine, said engine having an exhaust and cylinders, a turbocharger operatively coupled between said exhaust and said cylinders, said turbocharger having a housing for receiving said exhaust, a turbine assembly, said exhaust rotating said turbine assembly, said turbine assembly providing compressed air to said cylinders, said housing having a diameter, said diameter being dimensioned to control the exhaust gas volume and speed to optimize a turbine speed of said turbine assembly to reduce back pressure.    
   
   
       2 . The outboard jet drive marine system of  claim 1 , wherein said turbine assembly includes a first turbine disposed in said housing, said turbine rotating in response to exhaust from said engine, a shaft, a second turbine disposed in said housing coupled to said shaft so that said second turbine rotates with said first turbine, an air intake operatively communicating with said second turbine, said second turbine moving air from said air intake into said cylinders when rotating.  
   
   
       3 . The outboard jet drive system of  claim 2 , wherein said first turbine being larger than turbines providing low end power and said second turbine being smaller than turbines providing low end power.  
   
   
       4 . The outboard jet drive marine system of  claim 1 , wherein said engine has an effective horsepower of more than about 200 horsepower.  
   
   
       5 . The outboard jet drive marine system of  claim 2 , wherein said boat is a rigid inflatable boat.  
   
   
       6 . The outboard jet drive marine system of  claim 4 , wherein said boat is a rigid inflatable boat.  
   
   
       7 . The outboard jet drive marine system of  claim 1 , wherein said turbocharger increases the effective horsepower of said engine by at least twenty-five percent.  
   
   
       8 . The outboard jet drive marine system of  claim 1 , wherein said engine further comprises a cooling system, said cooling system being operatively coupled to said jet drive unit to receive water from said jet drive unit, a fuel line for providing fuel to said engine, said fuel line at least partially disposed within said water for cooling fuel within said fuel line.  
   
   
       9 . The outboard jet drive marine system of  claim 7 , wherein said engine has an effective horsepower of more than 200 horsepower.  
   
   
       10 . An outboard jet drive marine system for a boat comprising: 
 a housing;    an engine disposed within said housing;    a jet drive unit disposed within said housing substantially parallel to said engine, and operatively coupled to said engine;    a cooling system, operatively coupled to said jet drive for receiving water from said jet drive; and    a fuel line operatively coupled to said engine for providing fuel thereto, at least a portion of said fuel line extending through said cooling system, cooling fuel within said fuel line.    
   
   
       11 . The outboard jet drive marine system of  claim 10 , wherein said cooler system includes a heat exchanger and fuel cooler adjacent within said heat exchanger for cooling the fuel, the at least a portion of the fuel line being cooled by said heat exchanger;  
   
   
       12 . The outboard jet drive marine system of  claim 10 , further comprising an injection pump for pumping said fuel to said fuel cooler; and said fuel line including a return line for returning cooled fuel to the engine.  
   
   
       13 . The outboard jet drive marine system of  claim 12 , further comprising a fuel filter disposed between said return line and the engine.  
   
   
       14 . The outboard jet drive marine system of  claim 10 , wherein said housing is attached to a rigid inflatable boat.  
   
   
       15 . The outboard jet drive marine system of  claim 10 , wherein said housing is attached to a boat having a length of about 30 feet or less.