Flex and resonance controlled watercraft

Abstract

A subassembly structurally engineered and manufactured in an aquatic watercraft. The subassembly includes hollow cored or foam filled tube-like structures incased in a foam core blank. The foam core blank containing the subassembly is subsequently to be manually or machined shaped. The invention relates to methods for making the craft produced from subassembly foam blank and surfacing the craft with combinations of curable resins and structural fibers such as fiberglass or carbon, and/or thermoplastics.

1 . A core blank for the subsequent manufacturing of a personal watercraft board for use in the standing position, said core blank comprising: at least one inner structural flex member; comprising a tube like structure; said tube like structure comprising: at least an upper and lower resin impregnated fibrous layer in the upper and lower areas: the core blank further comprising a foam and or core positioned over and/or around said inner structural flex member, said foam core comprising a foam capable of being formed by the removal of material through planing and/or sanding, of the foams outer and inner material.  
   
   
       2 . A core blank according to  claim 1 , wherein: said structural member comprises an upper, lower and sides comprising resin fibrous impregnated structural materials.  
   
   
       3 . A core blank according to  claim 1 , wherein: said inner structural flex member comprises multiple resin-impregnated fiber layers.  
   
   
       4 . A core blank according to  claim 1 , further comprising: a longitudinally extending structural member within said core blank for further control of the flex and structural properties of said core blank.  
   
   
       5 . A blank according to  claim 1 , wherein: said longitudinally structural member extending is in a central position in or on the core blank.  
   
   
       6 . A blank according to  claim 1 , wherein: said foam core blank comprises thermoformed extruded polystyrene foam.  
   
   
       7 . A core blank according to  claim 1 , wherein: said foam core blank comprises a thermoformed extruded polyurethane foam.  
   
   
       8 . A core blank according to  claim 1 , wherein: said foam core blank comprises a thermoformed molded polystyrene foam.  
   
   
       9 . A core blank according to  claim 1 , wherein: said foam core blank comprises a thermoformed molded polyurethane foam.  
   
   
       10 . A core blank according to  claim 1 , further comprising: one or more structural members comprising honeycombed flexible reinforcement structures.  
   
   
       11 . A watercraft board according to  claim 1 , further comprising: one or more fin and or box receiving assemblies connected to one another.  
   
   
       12 . A watercraft board according to  claim 1 , further comprising: one or more fin box receiving assemblies structurally connected to one another and to the main structural member.  
   
   
       13 . A subassembly according to  claim 1 , further comprising: a plurality of longitudinally structural flex members extending within said core blank.  
   
   
       14 . A watercraft board according to  claim 1 , wherein said inner structural flex member includes a wall having a thickness of 0.1 to 4.0 millimeters.  
   
   
       15 . A method of manufacturing a subassembly according to  claim 1  for use in a subsequent production of an watercraft board, said method comprising: forming a extruded foam sheet: further comprising machining a foam sheet, said foam sheet having forward and rear areas of reduced thickness and a mid section with a inner structural flex member and forming the forward and rear sections with reinforcing forming members having curving shapes: assembling said curved forming members into said forward and rear sheet areas and attaching them to the inner structural flex member located in the mid section of said sheet so that said sheet forms a upwardly forward and rear ended foam shape suitable for machine shaping into a watercraft subassembly.  
   
   
       16 . A method according to  claim 1 , wherein said assembly of said formed subassembly further comprises covering a portion of at least one of said upper and lower surfaces with an outer layer of thermosetting resin-impregnated fibers.  
   
   
       17 . A method according to  claim 1 , further comprising the manufacturing of a watercraft board from the subassembly described in  claim 1 . further comprising: the removing of material from said outermost layer of said subassembly; and applying an outer covering at least over said outermost layer of said subassembly.