Water vessel with stern propulsion

Abstract

Fast boats create a water resistance that has a detrimental effect on the consumption of fuel. The object of the present invention is to reduce the water resistance to a minimum by meansf of an arrangement that automatically adjusts the direction of the propulsion force and the trimming planes so that minimum water resistance is obtained.

1 . A water vessel ( 1 ) with stern propulsion ( 8 ), such as propeller drive or jet drive, and preferably provided with one or more movable trimming bodies ( 2  and  3 ), such as trimming plates, 
 characterized in that, during operation of the water vessel ( 1 ), an arrangement strives to influence the same in such a way that minimum water resistance is obtained.  
 
     
     
         2 . A water vessel as claimed in  claim 1 , 
 characterized in that the arrangement includes an adjustment unit ( 4 ) for each trimming body ( 2  and  3 ) and, further, an adjustment unit ( 5 ) for the direction of the stern propulsion ( 8 ).    
     
     
         3 . A water vessel as claimed in  claim 2 , 
 characterized in that all the adjustment units ( 4  and  5 ) are connected to a central unit ( 6 ) for influencing the adjustment units ( 4  and  5 ) so that minimum water resistance is obtained.    
     
     
         4 . A water vessel as claimed in  claim 3 , 
 characterized in that position data regarding speed, stern propulsion ( 8 ) and trimming bodies ( 2  and  3 ) are supplied to the central unit ( 6 ).    
     
     
         5 . A water vessel as claimed in any one or more of the preceding claims, 
 characterized in that each trimming body ( 2  and  3 , respectively) is pivotable about the stern part ( 7 ).    
     
     
         6 . A water vessel as claimed in any one or more of the preceding claims, 
 characterized in that the stern propulsion ( 8 ) is pivotable about a central point in a downwardly-directed plane, such as a vertical plane.    
     
     
         7 . A water vessel as claimed in any one or more of the preceding claims, 
 characterized in that the central unit ( 6 ) adjusts the stern propulsion ( 8 ) and one or more trimming bodies ( 2  and  3 ) based on the position data so that minimum water resistance is obtained during operation.    
     
     
         8 . A water vessel as claimed in  claim 7 , 
 characterized in that the central unit ( 6 ) includes a control system such that said minimum water resistance is obtained, which control system can include a programmed computer unit.