Watercraft Structure, In Particular an Aquabike

Abstract

Watercraft structure, in particular an aquabike, comprising a first elongated floating body ( 5 ) and a second elongated floating body ( 6 ) connected to the first floating body and arranged parallel to it spaced at a determined distance. Between two floating bodies ( 5, 6 ), furthermore, a seat ( 16 ) is provided, which can be associated to a footrest and is connected by a rod ( 26 ) to the floating bodies ( 5, 6 ), on which one or more users can sit. For increasing the lifting forces pushing against the floating bodies ( 5, 6 ), a hydrodynamic lifting transversal element ( 30 ) is provided arranged at the barycentre of the watercraft ( 101 ). The hydrodynamic lifting transversal element ( 30 ) in use has an upper surface ( 31 ) that faces the floating bodies ( 5, 6 ) and a lower surface ( 32 ) opposite to the upper surface ( 31 ).

1 . Watercraft structure, in particular an aquabike, characterised in that it comprises:
 at least a first and a second elongated floating body, spaced apart from and connected to each other;   a propelling unit suitable for thrusting in a predetermined direction the above described first and second floating bodies;   at least one seat for an user;   a handlebar suitable for allowing the user to steer the thrust of said propelling unit;   at least one hydrodynamic lifting transversal element integrally connected to said floating bodies substantially under the barycentre of said watercraft and suitable for increasing the lifting forces caused by a sailing motion of said first and second floating bodies.   
   
   
       2 . Watercraft structure, according to  claim 1 , wherein said hydrodynamic lifting transversal element in use has an upper surface that faces said floating bodies and a lower opposite surface and is capable of generating a lifting force perpendicular to said lower surface delivered by pressure difference between said two surfaces when put in a flow. 
   
   
       3 . Watercraft structure, according to  claim 1 , where in addition to said first and second floating bodies, which in use are substantially parallel and are arranged sideways, a third floating body is provided arranged in a central and raised position. 
   
   
       4 . Watercraft structure, according to  claim 1 , wherein said propelling unit is selected from the group comprised of:
 an outboard engine;   an inboard engine.   
   
   
       5 . Watercraft structure, according to  claim 1 , wherein said propelling unit is selected from the group comprised of:
 a propeller type unit;   a water-jet type unit.   
   
   
       6 . Watercraft structure, according to  claim 3 , wherein said side floating bodies are engaged with said central floating body. 
   
   
       7 . Watercraft structure, according to  claim 6 , wherein said side floating bodies are engaged to said central floating body by at least one strip of fabric having a portion constrained to a said side floating body and a portion constrained to said central floating body. 
   
   
       8 . Watercraft structure, according to  claim 7 , wherein said strip of fabric is constrained to each of said floating bodies by a connecting means selected from the group comprised of: glue, seams, mutual engagement elements or combination thereof. 
   
   
       9 . Watercraft structure, according to  claim 1 , wherein said floating bodies are selected from the group comprised of:
 stiff floating bodies;   inflatable floating bodies;   a combination of stiff and inflatable floating bodies.   
   
   
       10 . Watercraft structure, according to  claim 1 , wherein said floating bodies are of inflatable type and a frame is provided comprising a plurality of stiffening longitudinal elements constrained to said hydrodynamic lifting transversal element. 
   
   
       11 . Watercraft structure, according to  claim 7 , wherein said stiffening longitudinal elements are inserted in longitudinal sheaths defined by said strips of fabric. 
   
   
       12 . Watercraft structure, according to  claim 1 , wherein said frame comprises said stiffening longitudinal elements in rows connected by means of stiffening transversal elements.