Planing Hull with Concentric Pad Keel

Abstract

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

What is claimed is: 
     
         1 . A watercraft including a Deep-V Planing Hull comprising:
 a Fine Entry Bow;   a Transom; and   a Concentric 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 that Tapers from the Transom to an apex at the Forefoot of the Fine Entry Bow. 
   
     
     
         2 . The watercraft of  claim 1 , wherein the watercraft has a Waterline Length To Beam Ratio of less than 4 and the Main Pad Keel and Second Pad Keel have an average width between 15 percent to 25 percent of a Hull Chine Beam at the Transom. 
     
     
         3 . The watercraft of  claim 1 , wherein the watercraft has a Waterline Length To Beam Ratio of 4 or greater and the Main Pad Keel and Second Pad Keel have an average width between 20 percent to 30 percent of a Hull Chine Beam at the Transom. 
     
     
         4 . The watercraft of  claim 1 , wherein the Main Pad Keel Sides have Deadrise angles between 45 degrees to 90 degrees: and wherein the Main Pad Keel Sides have a height that is between 20% to 30% of a width of the Main Pad Keel. 
     
     
         5 . The watercraft of  claim 1 , wherein the Deep-V Planing Hull is Longitudinally Stepped and Transversely Stepped; and wherein the Ultra High Deadrise Second Pad Keel Sides have a constant angle of 50 degrees forward of a station  3  of the Deep-V Planing Hull and a constant angle of 90 degrees between station  3  and a station  1  of the Deep-V Planing Hull; and wherein the Ultra High Deadrise Main Pad Keel Sides have a constant Deadrise angle of 90 degrees. 
     
     
         6 . A watercraft including a Planing Hull comprising:
 a Fine Entry Bow;   a Transom;   a Concentric Pad Keel including,
 a Main Pad Keel constructed with a Hollow Plenum, the Main Pad Keel having one or more Bow Pocket Vents allowing air to vent a Hollow Plenum, and 
 a Second Pad Keel having an opening at an aft end of the Second Pad Keel allowing Ventilating Air to Ventilate the Main Pad Keel. 
   
     
     
         7 . The watercraft of  claim 6 , wherein Planing Hull includes a VASFI and the Hollow Plenum provides Ventilating Air to the VASFI. 
     
     
         8 . The watercraft of  claim 6 , wherein the Planing Hull includes one or more transverse steps to the Main Pad Keel and Second Pad Keel and the Hollow Plenum provides Ventilating Air to the Transverse Steps. 
     
     
         9 . The watercraft of  claims 6 , wherein the Planing Hull includes a Pad Keel Side Ventilator, and the Hollow Plenum provides Ventilating Air to the Pad Keel Side Ventilator. 
     
     
         10 . The watercraft of  claims 6 , wherein the Planing Hull includes a Wedge Ventilator and the Hollow Plenum provides Ventilating Air to the Wedge Ventilator. 
     
     
         11 . A Concentric Pad Keel operable to reduce Slamming, comprising:
 a Main Pad Keel extending downward from Ultra High Deadrise Main Pad Keel Sides;   wherein the Ultra High Deadrise Main Pad Keel Sides have Deadrise angles between 45 degrees to 90 degrees; wherein the height of the Main Pad Keel Sides at a Transom are between 20% to 30% of a Main Pad Keel width;   a Second Pad Keel projecting downward from the Main Pad Keel on Ultra High Deadrise Second Pad Keel Sides with deadrise angles between 45 and 90 degrees; wherein the Second Pad Keel is narrower than the Main Pad Keel;   wherein, in operation, a watercraft incorporating the Concentric Pad Keel becomes partially or fully airborne from a water surface; wherein the watercraft reenters the water surface after falling; wherein the Second Pad Keel is a first Hull structure of the watercraft to make contact with the water surface upon reentering the water surface; wherein the impact of the Second Pad Keel on the water surface generates an Acceptable Slamming Force; and wherein the Main Pad Keel is a second Hull structure of the watercraft to make contact with the water surface as the watercraft reenters the water surface.