Boat the planing bottom of which is fitted with sets of rollers for conversion of friction into dynamic thrust

Abstract

Two sets of idle rollers are fixed to the planing bottom of a boat, one set on each side, or to its appendices, for transforming the continuous movement of water against the V-shaped hull, responsible for hindering its forward progress, into a propulsive thrust. This results in faster forward drive, propulsive power being equal. Each set of rollers is housed in a rectangular container placed in a purposely made recess in the stern with the rollers lying perpendicular to the forward direction of the boat. The sets of rollers can be placed separately preferably close to the stern board and to the keel. These rollers are cylindrical or frusto-conical in shape, of any diameter, length and number compatible with the size of the planing bottom of the boat, their surfaces being smooth or suitably grooved to improve thrust, stability and drainage.

1 - 11 . (canceled) 
     
     
         12 . Boat ( 10 ) comprising housing means ( 12 ,  16 ) to contain at least one set of idle rollers ( 14 ,  17 ) on each side of the bottom ( 11 ), said rollers lying perpendicular to the forward movement of the boat ( 10 ) and may come in contact with the water reducing the friction between the water and the hull, characterized in that said bottom ( 11 ) is of the planing type, and said housing means ( 12 ,  16 ) for each set of rollers ( 14 ,  17 ) are placed, separately one from another, preferably close to the stern board ( 15 ) and to the keel ( 13 ). 
     
     
         13 . Boat ( 10 ) as in  claim 12 , wherein said housing means ( 12 ,  16 ) comprise a container fixed to the bottom ( 11 ), said container having no wall on its side opposite to the bottom. 
     
     
         14 . Boat ( 10 ) as in  claim 13 , wherein the wall ( 20 ), of said container ( 12 ,  16 ), nearest to the stern board ( 15 ), is concave to favour outflow of water. 
     
     
         15 . Boat ( 10 ) as in  claim 12 , wherein said housing means ( 12 ,  16 ) are each fitted into a respective recess in the bottom ( 11 ). 
     
     
         16 . Boat ( 10 ) as in  claim 12 , wherein said rollers ( 14 ,  17 ) are frusto-conical in shape for better adaptation to the bottom of the boat. 
     
     
         17 . Boat ( 10 ) as in  claim 12 , wherein the surface of said rollers ( 14 ,  17 ) is smooth. 
     
     
         18 . Boat ( 10 ) as in  claim 12 , wherein the surface of said rollers ( 14 ,  17 ) is grooved. 
     
     
         19 . Boat ( 10 ) as in  claim 12 , wherein said rollers ( 14 ,  17 ) are arranged in a double row. 
     
     
         20 . Boat ( 10 ) as in  claim 13 , wherein said housing means ( 12 ,  16 ) are each fitted into a respective recess in the bottom ( 11 ). 
     
     
         21 . Boat ( 10 ) as in  claim 14 , wherein said housing means ( 12 ,  16 ) are each fitted into a respective recess in the bottom ( 11 ).