Motorboat with a skimmer hull

Abstract

The invention concerns a motorboat with a skimmer hull. The hull is a W-shaped cross section and comprises an inverted V-shaped longitudinal central tunnel formed by two median faces of the hull and extending substantially over all the length of the hull, the vertex of this tunnel being level with the waterline.

What we claim is :  
     
         1 . A motorboat with a skimmer hull, characterized in that the hull has a W-shaped cross section and comprises an inverted V-shaped longitudinal central tunnel which extends substantially all the length of the hull and whose bottom ( 24 ) is substantially level with the waterline.  
     
     
         2 . A boat according to  claim 1 , characterized in that the width or transverse dimension of the tunnel is substantially constant over all of the length of the hull.  
     
     
         3 . A boat according to  claim 1  or  claim 2 , characterized in that the bow ( 28 ) is truncated.  
     
     
         4 . A boat according to any preceding claim, characterized in that the angle of the faces ( 12 ,  14 ) of the tunnel is substantially constant over all of the length of the hull.  
     
     
         5 . A boat according to any preceding claim, characterized in that the angle of the faces ( 12 ,  14 ) of the tunnel increases slightly in the vicinity of the bow.  
     
     
         6 . A boat according to any preceding claim, characterized in that the base line ( 24 ) of the tunnel is slightly inclined downwardly from the bow toward the stern.  
     
     
         7 . A boat according to  claim 6 , characterized in that the angle of the faces ( 12 ,  14 ) of the tunnel increases slightly in the vicinity of the stern.  
     
     
         8 . A boat according to any preceding claim, characterized in that the base line ( 24 ) of the tunnel is substantially rectilinear.  
     
     
         9 . A boat according to any preceding claim, characterized in that the longitudinal faces ( 10 ,  12 ,  14 ,  16 ) of the hull are substantially symmetrical in pairs with respect to longitudinal vertical planes ( 18 ,  20 ,  22 ) passing through the junctions of these faces.  
     
     
         10 . A boat according to any of  claims 1  to  8 , characterized in that the angles between the faces ( 12 ,  14 ) of the tunnel and longitudinal vertical planes passing through the junctions of these faces with the exterior faces ( 10 ,  16 ) of the hull are different from the angles between said exterior faces ( 10 ,  16 ) and those planes.  
     
     
         11 . A boat according to any preceding claim, characterized in that the angles of the faces ( 10 ,  12 ,  14 ,  16 ) of the hull to the vertical are from approximately 40° to approximately 75°.  
     
     
         12 . A boat according to any preceding claim, characterized in that an underwater and optionally removable transverse aileron ( 34 ) is mounted between the faces ( 12 ,  14 ) of the central tunnel in the aft portion of the boat.