Exhaust for outboard jet propulsion engine

Abstract

An outboard jet drive marine system for a boat comprises a bucket assembly adapted to be mounted to a jet drive unit for receiving a water exhaust from a jet drive unit. The bucket assembly has a bucket housing. The bucket housing has a first exhaust, and at least a second exhaust. The second exhaust directs the water jet in a direction towards and beneath the boat. The bucket housing has an entrance port for receiving said water exhaust. A bucket is rotatably mounted on the bucket housing at the first exhaust and is rotatable relative to the first exhaust between an open position and a closed position. The bucket deflects water entering the entrance port to the at least a second exhaust when in a closed position.

1 . An outboard jet drive marine system for a boat comprising: 
 a bucket assembly adapted to be mounted to a jet drive unit for receiving a water exhaust from said jet drive unit, said bucket assembly having a bucket housing, said bucket housing having a first exhaust, and at least a second exhaust;    the at least second exhaust including a first vent and a second vent mounted to said bucket housing, said bucket housing having an entrance port for receiving said water exhaust, said first vent being disposed on the housing along a first axis and said second vent being disposed on the housing along a second axis, the first axis intersecting the second axis; and    a bucket rotatably mounted on said bucket housing at said first exhaust and being rotatable relative to said first exhaust between an open position and a closed position, said bucket deflecting water entering said entrance port to said first and second vents when in a closed position.    
   
   
       2 . The outboard jet drive marine system for a boat of  claim 1 , wherein said bucket housing has a bottom, the first vent and second vent being disposed along a circumference of said bucket housing away from the bottom.  
   
   
       3 . The outboard jet drive marine system for a boat of  claim 1 , further comprising a first plenum and a second plenum in communication with the interior of said bucket, said first plenum and said second plenum extending to the bottom of said bucket housing when said bucket is in the closed position.  
   
   
       4 . The outboard jet drive marine system for a boat of  claim 3 , wherein each said plenum extends at a substantially obtuse angle to said at least one of said first and second vents.  
   
   
       5 . The outboard jet drive marine system of  claim 1 , wherein said bucket causes said first vent to be in fluid communication with said second vent, when said bucket is in the closed position.  
   
   
       6 . An outboard jet drive marine system for a boat comprising: 
 a housing, said housing having side walls and a bottom, said housing adapted to be affixed behind a hull of said boat;    an engine disposed within said housing, said engine having an exhaust;    a jet drive unit mounted to said housing and being operatively coupled to said engine and said housing; and    elongated grooves formed in the sidewall of said housing communicating with said exhaust and being upstream of said jet drive unit.    
   
   
       7 . The outboard jet drive marine system of  claim 6 , further comprising: 
 a bucket assembly adapted to be mounted to a jet drive unit for receiving a water exhaust from said jet drive unit, said bucket assembly having a bucket housing, said bucket housing having a first exhaust, and at least a second exhaust;    the at least second exhaust including a first vent and a second vent mounted to said bucket housing, said bucket housing having an entrance port for receiving said water exhaust, said first vent being disposed on the housing along a first axis and said second vent being disposed on the housing along a second axis, the first axis intersecting the second axis; and    a bucket rotatably mounted on said bucket housing at said first exhaust and being rotatable relative to said first exhaust between an open position and a closed position, said bucket deflecting water entering said entrance port to said first and second vents when in a closed position.    
   
   
       8 . The outboard jet drive marine system for a boat of  claim 7 , wherein said bucket housing has a bottom, the first vent and second vent being disposed along a circumference of said bucket housing away from the bottom.  
   
   
       9 . The outboard jet drive marine system for a boat of  claim 7 , further comprising a first plenum and a second plenum in communication with the interior of said bucket, said first plenum and said second plenum extending to the bottom of said bucket housing when said bucket is in the closed position.  
   
   
       10 . The outboard jet drive marine system for a boat of  claim 9 , wherein each said plenum extends at a substantially obtuse angle to said at least one of said first and second vents.  
   
   
       11 . The outboard jet drive marine system of  claim 7 , wherein said bucket causes said first vent to be in fluid communication with said second vent, when said bucket is in the closed position.  
   
   
       12 . An outboard jet drive marine system for a boat comprising: 
 a bucket assembly adapted to be mounted to a jet drive unit for receiving a water exhaust from said jet drive unit, said bucket assembly having a bucket housing, said bucket housing having a first exhaust and at least a second exhaust, the at least second exhaust including a frame disposed within said housing and a vane disposed within said frame for directing said water exhaust towards said boat at an angle to direct the water below said boat; and    a bucket rotatably mounted on said bucket housing at said first exhaust and being rotatable between an open position and a closed position, said bucket allowing water to exit said first exhaust when in the open position and deflecting water entering said entrance port to said second exhaust when in the closed position.    
   
   
       13 . The outboard jet drive marine system for a boat of  claim 12 , wherein said vane is disposed within the said frame at an angle relative to a plane in which a bottom of said boat resides.  
   
   
       14 . The outboard jet drive marine system for a boat of  claim 12 , further comprising at least a second vane disposed within said frame and intersecting said first vane to form a plurality of plenum within said frame.  
   
   
       15 . The outboard jet drive marine system for a boat of  claim 12 , further comprising at least a second plenum communicating with the interior of said bucket, said at least second plenum extending at least to the bottom of said bucket housing when said bucket is in the closed position.  
   
   
       16 . The outboard jet drive marine system for a boat of  claim 15 , wherein each said plenum extends at a substantially obtuse angle to said frame.  
   
   
       17 . The outboard jet drive marine system for a boat of  claim 12 , wherein said bucket is convex.  
   
   
       18 . The outboard jet drive marine system for a boat of  claim 12 , wherein said at least second plenum is tapered.