Watercraft with sound suppressed stepped hull

Abstract

A watercraft is disclosed, comprising a deck and a hull. where the hull is stepped intermediate a length of the hull to form an upper stepped surface. The upper stepped surface comprises sound suppressing dimples profiled to cancel an acoustical wave standing in the area adjacent the upper stepped surface. The watercraft has a longitudinally extending turning fin positioned adjacent to the upper stepped surface. The sound suppressing dimples are configured as inverted concave frusto-conical sections.

1 . A watercraft, comprising a deck and a hull, the hull being stepped intermediate a length of the hull to form an upper stepped surface, said upper stepped surface comprising sound suppressing dimples profiled to cancel an acoustical wave standing in the area adjacent the upper stepped surface.  
   
   
       2 . The watercraft of  claim 1 , further comprising a longitudinally extending turning fin positioned adjacent to the upper stepped surface.  
   
   
       3 . The watercraft of  claim 2 , further comprising a rear chine portion.  
   
   
       4 . The watercraft of  claim 3 , wherein the rear chine portion extends along the outer edge of the upper stepped portion.  
   
   
       5 . The watercraft of  claim 4 , comprising a forward chine portion forward of said stepped portion.  
   
   
       6 . The watercraft of  claim 5 , wherein the sound suppressing dimples are configured as concave dimples.  
   
   
       7 . The watercraft of  claim 6 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.  
   
   
       8 . The watercraft of  claim 1 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.  
   
   
       9 . A watercraft comprising a deck and a hull, the hull being stepped intermediate a length of the hull to form an upper stepped surface, said upper stepped surface comprising sound suppressing means for canceling an acoustical wave standing in the area adjacent the upper stepped surface.  
   
   
       10 . The watercraft of  claim 9 , wherein the sound suppressing means are configured as concave sound suppressing dimples.  
   
   
       11 . The watercraft of  claim 10 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.  
   
   
       12 . The watercraft of  claim 9 , further comprising a longitudinally extending turning fin positioned adjacent to the upper stepped surface.  
   
   
       13 . The watercraft of  claim 9 , further comprising a rear chine portion.  
   
   
       14 . The watercraft of  claim 13 , wherein the rear chine portion extends along the outer edge of the upper stepped portion.  
   
   
       15 . The watercraft of  claim 14 , comprising a forward chine portion forward of said stepped portion.  
   
   
       16 . The watercraft of  claim 15 , wherein the sound suppressing means are configured as concave dimples.  
   
   
       17 . The watercraft of  claim 16 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.  
   
   
       18 . A watercraft, comprising a deck and a hull, the hull having a plurality of surfaces forming an acoustical chamber with the waterline, the hull comprising sound suppressing dimples profiled to cancel an acoustical wave standing in the chamber.  
   
   
       19 . The watercraft of  claim 18 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.  
   
   
       20 . The watercraft of  claim 18 , further comprising a longitudinally extending turning fin positioned adjacent to said acoustical chamber.  
   
   
       21 . The watercraft of  claim 18 , wherein the hull is stepped intermediate a length of the hull to form an upper stepped surface, said upper stepped surface comprising said sound suppressing dimples.  
   
   
       22 . The watercraft of  claim 21 , further comprising a longitudinally extending turning fin positioned adjacent to the upper stepped surface.  
   
   
       23 . The watercraft of  claim 22 , further comprising a rear chine portion.  
   
   
       24 . The watercraft of  claim 23 , wherein the rear chine portion extends along the outer edge of the upper stepped portion.  
   
   
       25 . The watercraft of  claim 24 , comprising a forward chine portion forward of said stepped portion.  
   
   
       26 . The watercraft of  claim 25 , wherein the sound suppressing means are configured as concave dimples.  
   
   
       27 . The watercraft of  claim 26 , wherein the sound suppressing dimples are configured as inverted concave frusto-conical sections.