Airboat with aquiatic vegetation shredding assembly

Abstract

An airboat having aquatic vegetation shredder includes an airboat having a buoyant hull and an aquatic vegetation shredding assembly supported on the hull. The airboat is driven by a propulsion assembly including a propeller that revolves in the air. These features cooperatively provide a low draft vessel that is capable of relatively higher forward speeds than other aquatic vegetation shredders and particularly effective in shallow water environments. Various alternative configurations of the shredding assembly are disclosed including upright and fore-and-aft shaft orientations for the cutting assembly and a drum and knife cutting assembly.

1 . An aquatic vegetation shredder for shredding vegetation growing in water, said shredder comprising: 
 an airboat including a buoyant hull presenting a forward-most bow end and a rearward-most stern end,    said hull including a pair of spaced sidewalls and a forward-most front wall extending between the sidewalls,    said front wall comprising the bow end of the boat and extending the full width of the hull to present a substantially planar, unitary bow end,    said airboat being driven by a propulsion assembly including a propeller revolving in the air; and    an aquatic vegetation shredding assembly supported on the hull and being operable to shred vegetation growing in the water while the propulsion assembly propels the airboat through the water,    said shredding assembly extending substantially across the width of the hull and including a rotatable element rotatable about a generally upright axis and a blade swingably mounted to the rotatable element,    said rotatable element and swingable blade positionable into the water adjacent the bow end of the hull when shredding vegetation,    said rotatable element and swingable blade being spaced from the bow end by a working space,    said shredder being otherwise devoid of harvesting and cutting structure within said working space when the airboat is propelled through the water so that at least substantially all of the shredded vegetation remains in the water.    
   
   
       2 . An aquatic vegetation shredder as claimed in  claim 1 , 
 said propulsion assembly including a power source drivingly coupled to the propeller,    said propeller including a plurality of fan blades,    said propeller being configured to permit a pitch angle for each of the fan blades to be varied.    
   
   
       3 . An aquatic vegetation shredder as claimed in  claim 1 , 
 said aquatic vegetation shredding assembly including a frame and a shaft rotatably supported by the frame, said rotatable element being fixed to the shaft,    said shaft being positioned generally ahead of the bow end of the airboat and said propeller being adjacent the stern end of the airboat.    
   
   
       4 . An aquatic vegetation shredder as claimed in  claim 3 , 
 said shaft being rotatable about the upright axis.    
   
   
       5 . An aquatic vegetation shredder as claimed in  claim 4 , 
 said shaft being pivotally supported on the frame so that the orientation of the upright axis may be varied.    
   
   
       6 . An aquatic vegetation shredder as claimed in  claim 5 , 
 said frame being swingably mounted on the hull.    
   
   
       7 . An aquatic vegetation shredder as claimed in  claim 3 , 
 said aquatic vegetation shredding assembly including an additional shaft spaced laterally from the first-mentioned shaft such that the shafts are in a starboard and port relationship,    an additional blade coupled to the additional shaft,    said starboard shaft and port shaft being independently and reversibly rotatable relative to each other.