Boat hull with roll stability at low or high speeds

Abstract

A boat hull comprises a transom and a bow; a substantially flat delta bottom surface; left and right sidewalls extending from the transom and converging to meet at the bow; left and right chines formed between the left sidewall and the bottom surface, and between the right sidewall and the bottom surface, respectively, the chines extending from the transom to the bow; and a planing area extending from the transom and a landing area extending from the bow. The chines and the bottom surface are substantially flat in the planing area. The angular bottom portions join the chines and the bottom surface. The angular bottom portions have a deadrise increasing from the transom toward the bow.

1 . A boat hull, comprising: 
 a) a transom and a bow;    b) left and right sidewalls extending from said transom and converging to meet at said bow;    c) a substantially flat delta bottom surface extending from said transom toward said bow;    d) left and right chines formed between said left sidewall and said bottom surface, and between said right sidewall and said bottom surface, respectively, said chines extending from said transom to said bow;    e) said flat delta bottom surface extending to about 75-80% of the length of said chines;    f) said chines and said bottom surface are substantially horizontal at said transom; and    g) said chines and said bottom surface comprise about 35-65% of the width of said hull at said transom.    
   
   
       2 . A boat hull as in  claim 1 , and further comprising angularly disposed bottom portions joining said chines and said bottom surface.  
   
   
       3 . A boat hull as in  claim 2 , wherein said bottom portions rise between about 25°-56° from a horizontal plane.  
   
   
       4 . A boat hull as in  claim 1 , said chines are joined to said sidewalls.  
   
   
       5 . A boat hull as in  claim 1 , wherein said chines flare up to direct water spray away from said hull.  
   
   
       6 . A boat hull as in  claim 1 , wherein said flat delta bottom surface in cross-section has about ±5-10° angle from a horizontal on either side of a centerline through said boat hull.  
   
   
       7 . A boat hull as in  claim 1 , wherein said chines and said bottom surface at said transom includes a variation from the horizontal of about ±5-10°.  
   
   
       8 . A boat hull, comprising: 
 a) a transom and a bow;    b) a substantially flat delta bottom surface;    c) left and right sidewalls extending from said transom and converging to meet at said bow;    d) left and right chines formed between said left sidewall and said bottom surface, and between said right sidewall and said bottom surface, respectively, said chines extending from said transom to said bow;    e) a planing area extending from said transom and a landing area extending from said bow;    f) said chines and said bottom surface are substantially flat in said planing area; and    g) angular bottom portions joining said chines and said bottom surface, said angular bottom portions having a deadrise increasing from said transom toward said bow.    
   
   
       9 . A boat hull as in  claim 8 , wherein said chines flare up in said landing area.  
   
   
       10 . A boat hull as in  claim 8 , wherein said landing area has a deep V cross-section.  
   
   
       11 . A boat hull as in  claim 9 , wherein said chines and said bottom surface comprise about 35-65% of the width of said hull at said transom.  
   
   
       12 . A boat hull as in  claim 8 , wherein said landing area is about 25%-50% of the chine length between said transom and said bow.  
   
   
       13 . A boat hull as in  claim 8 , wherein said angular portions have a deadrise that increases from said transom toward said bow.  
   
   
       14 . A boat hull as in  claim 12 , wherein said deadrise is from about 25° at said transom to about 56° near said bow.  
   
   
       15 . A boat hull as in  claim 8 , wherein said flat delta bottom surface extends to about 75-80% of the length of said chines from said transom toward said bow, said bottom surface being wide to narrow toward said bow.  
   
   
       16 . A boat hull as in  claim 15 , wherein said flat delta bottom surface in cross-section has about ±5-10° angle from a horizontal on either side of a centerline through said boat hull.  
   
   
       17 . A boat hull as in  claim 9 , wherein said chines gradually widen and flatten as they extend from near said bow toward said transom.  
   
   
       18 . A boat hull as in  claim 8 , wherein said chines drop in elevation from near said bow toward said transom.