Boat hull with flow chamber

Abstract

A boat hull having a two-stage flow chamber. The first stage flow chamber starts about amidships as a V-shape fairing upward at a shallow angle and flattening out about halfway to the stern. The second stage flow chamber starts at the end of the forward flow chamber curving upward at a greater angle than the first stage and curving downward slightly at the stern. The second state flow chamber has an inverted V-shape portion connected to the bottom by a pair of narrow sidewalls spreading slightly outward. The forward flwo chamber delivers water to the aft flow chamber free from turbulence. The propeller is disposed in the aft flow chamber and splayed slighly to port. Water exits from the aft flow chamber with minimum turbulence and cavitation.

I claim: 
     
       1. A boat hull having a V bottom and a keel line comprising: a forward flow chamber defined by a first surface beginning approximately amidships of said hull and extending above the keel line thereof starting as a V-shape lying essentially transverse to the keel line, said first surface connected to said bottom by a pair of planar sides fairing slightly outboard from a vertical plane, said forward flow chamber gradually increasing in cross-sectional area as extended aft and the angle of said V-shape increasing such that the angle of said surface at the aft end of said forward flow chamber is approximately 180°;   a .[.keelson.]. .Iadd.keel .Iaddend.disposed and aligned longitudinally with said keel line in said forward flow chamber; and   an aft flow chamber defined by a second surface beginning at said aft end of said forward flow chamber and curving upward as an inverted V-shape, said second surface connected to said bottom by aft extensions of said pair of planar sides, said second surface curving downward slightly at the stern of said hull;   whereby said forward flow chamber delivers water to said aft flow chamber smoothly with minimum turbulence and water issues from said aft flow chamber with minimum cavitation and turbulence.   
     
     
       2. The hull as defined in claim 1 in which the rate at which said second surface curves upward is greater than the rate of upward extension of said first surface. 
     
     
       3. The hull as defined in claim 2 in which said upward extension of said first surface forms a curve. 
     
     
       4. The hull as defined in claim 1 which further comprises a propeller shaft and a propeller disposed in said aft flow chamber, said propeller shaft splayed with respect to said keel line. 
     
     
       5. The hull as defined in claim 4 in which said aft flow chamber comprises a tunnel, said propeller being disposed completely within said tunnel. 
     
     
       6. The hull as defined in claim 1 which further comprises a skeg extending from the aft end of said .[.keelson.]. .Iadd.keel .Iaddend.aft to said stern. .Iadd. 
     
     
       7.  A boat hull having at least one two-stage flow chamber comprising: a V-bottom hull having a forward flow chamber stage defined by a first surface beginning with a flow entry portion parallel to adjacent surfaces of the boat hull and gradually increasing in depth as said forward stage extends toward an aft end of the boat hull, said first surface angularly varying from a plane parallel to said surface of the hull to a plane lying substantially parallel to a surface of water when the boat hull is at rest in the water; and   an aft flow chamber stage aligned with an aft end of said forward flow chamber stage and defined by a second surface beginning at said aft end of said forward flow chamber stage and curving upward into an inverted V-shape and having a pair of opposed planar sides connecting said second surface to said boat hull. .Iaddend. .Iadd.   
     
     
       8.  The boat hull of claim 7 and including a second flow chamber having corresponding forward and aft flow chamber stages substantially identical to said forward flow chamber stage and said aft flow chamber stage, respectively, of said at least one flow chamber, said second flow chamber being positioned parallel to said at least one flow chamber on an opposite side of a keel line of the boat hull, an additional propeller and drive shaft being disposed within only said aft flow chamber stage of said second flow chamber. .Iadd. 
     
     
       9.  The boat hull chamber of claim 7 and including a second flow chamber substantially identical to said at least one flow chamber, said second flow chamber being positioned parallel to said at least one flow chamber. .Iaddend. .Iadd.10. The boat hull of claim 7 and including a keel disposed only within and aligned longitudinally with a longitudinal mid-line of said forward flow chamber stage. .Iaddend.