Variable Second Pad Keel

Abstract

By including a Variable Second Pad Keel, a watercraft experiences a reduction in Slamming forces as well as generally improved Seakeeping and Seakindliness.

What is claimed: 
     
         1 . A watercraft including a Deep-V Planing Hull comprising:
 a Fine Entry Bow:   a Transom; and   a Variable Second Pad Keel having,
 a Main Pad Keel projecting downward from the Deep-V Planing Hull on Ultra High Deadrise Main Pad Keel Sides, and 
 a Second Pad Keel projecting downward from the Main Pad Keel on Ultra High Deadrise Second Pad Keel Sides; wherein the Second Pad Keel Sides Taper from the Transom to an apex at the Forefoot of the Fine Entry Bow. 
   
     
     
         2 . The watercraft of  claim 1 , wherein the Second Pad Keel is Uniform. 
     
     
         3 . The watercraft of  claim 1 , wherein the Second Pad Keel is Truncated forward of the Transom; and wherein the Plenum in the Second Pad Keel is ventilated, thereby ventilating the Main Pad Keel. 
     
     
         4 . The watercraft of  claim 1 , wherein the Second Pad Keel is Rocketed. 
     
     
         5 . The watercraft of  claim 4 , wherein the Second Pad Keel is Rocketed from a Height of 1 inch at the Forward End to a Height in a range of 0 inches to ½ inches as die Aft End. 
     
     
         6 . The watercraft of  claim 1 , wherein the Second Pad Keel Expands in Width to Blend with the Main Pad Keel Sides; wherein the Second Pad Keel Sides Deadrise varies from 90 degrees at a Forward End of the Second Pad Keel to Blend to the Deadrise of the Main Pad Keel Sides at the Aft End of the Second Pad Keel. 
     
     
         7 . The watercraft of  claim 1 , wherein the Second Pad Keel Expands in Width to Blend with the Main Pad keel Sides; wherein the Second Pad keel Sides Deadrise varies from 90 degrees at a Forward End of the Second Pad Keel to Blend to the Deadrise of the Main Pad Keel Sides at the Aft End of the Second Pad Keel; and wherein the Second Pad Keel is Rockered. 
     
     
         8 . The watercraft of  claim 7 , wherein the Second Pad Keel is Rockered from a height of 1 inch to a height in a range of 0 inches to ½ inches. 
     
     
         9 . The watercraft of  claim 1 , wherein the Second Pad Keel is Rockered to the Transom. 
     
     
         10 . The watercraft of  claim 6 , wherein the Second Pad Keel is Rockered from a height of 1 inch to a height in a range of 0 inches to ½ inches. 
     
     
         11 . The watercraft of  claim 1 , wherein the Second Pad Keel Expands with the Second Pad Keel Sides having a constant deadrise of 90 degrees; and wherein the Second Pad Keel Sides Blend with the Main Pad Keel Sides at a point forward of the Transom. 
     
     
         12 . The watercraft of  claim 1 , wherein the Second Pad Keel Expands with Second Pad Keel Sides having a constant Deadrise of 90 degrees; wherein the Second Pad Keel Sides Blend with the Main Pad Keel Sides at a point forward of the Transom; wherein the Second Pad Keel is Truncated and Rockers to a point forward of the Transom; and wherein the Second Pad Keel Sides Taper. 
     
     
         13 . The watercraft of  claim 1 , wherein the Second Pad Keel Sides Tapers from a Height of 1 inch to a Height in a range of 0 inches to ½ inches. 
     
     
         14 . The watercraft of  claim 1 , wherein the watercraft has a Waterline Length To Beam Ratio of less than 3 and an average Width measured at the Transom of the Main Pad Keel and the Second Pad Keel is between 10 percent to 20 percent of a Hull Chine Beam measured at the Transom. 
     
     
         15 . The watercraft of  claim 1 , wherein the watercraft has a Waterline Length To Beam Ratio of between 3 and 4 and an average Width measured at the Transom of the Main Pad Keel and the Second Pad Keel is between 15 percent to 25 percent of a Hull Chine Beam measured at the Transom 
     
     
         16 . The watercraft of  claim 1 , wherein the watercraft has a Waterline Length To Beam Ratio of 4 or greater and an average Width measured at the Transom of the Main Pad Keel and the Second Pad Keel is between 20 percent to 30 percent of a Hull Chine Beam measured at the Transom.