Hull For Sailing Craft Whereof The Bottom Enables Water Gliding Performances To Be Enhanced

Abstract

A hull ( 1 ) for sailing craft enables water gliding performances to be enhanced. The hull ( 1 ) for a sailing craft includes a bottom ( 2 ) which has a particular profile. The bottom ( 2 ) includes a rail ( 3 ) shaped from the stem up to the transom, the rail ( 3 ) being formed by a flat axial sole ( 6 ) linking two parallel passageways of the stem to the transom, of similar width, of similar depth of the water inlet at the transom exit, the passageways derived from the sole ( 6 ) have a cross-sectional profile on either side of the sole ( 6 ) to form two V-shaped inclined planes ( 9, 10 ) and are terminated by two arcs of a quarter circle which are further extended by two other inclined parts ( 13, 14 ) forming another V-shape less inclined than the first and leading to the upper works ( 15, 16 ). The invention is applicable to boats.

1 . Hull ( 1 ) for sailing craft with a bottom ( 2 ) which has a particular profile, the aforementioned bottom ( 2 ) being characterized by at least one rail ( 3 ) shaped from stem ( 4 ) to transom ( 5 ), said rail ( 3 ) being formed by a flat axial sole ( 6 ) linking two parallel passageways ( 7 ,  8 ) from stem ( 4 ) to transom ( 5 ), of similar width, similar depth of water inlet at the transom ( 5 ) exit, the passageways resulting from sole ( 6 ) having a cross-sectional profile on either side of sole ( 6 ) to form two inclined planes ( 9 ,  10 ) forming first shape V (V 1 ) and terminate in two arc of quarter circle profiles ( 11 ,  12 ) which are further extended by two other inclined parts ( 13 ,  14 ) forming another V shape (V 2 ), less inclined than the first leading to the upper works ( 15 , 16 ). 
   
   
       2 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the width of the said passageways ( 7 ,  8 ) accounts for ⅓ to 40% of the width of hull ( 1 ).   
   
   
       3 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 two inclined planes ( 9 ,  10 ) of the first V shape (V 1 ) of passageways ( 7 ,  8 ) are of perfectly straight up to the beginning of arcs of circle ( 12 ,  13 ) which form the arches of passageways ( 7 ,  8 ).   
   
   
       4 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the arches of passageways ( 7 ,  8 ) have an arc of quarter circle form so that the central water stream and the air bubbles are well contained up to the rear of hull ( 1 ), thus ensuring better sliding.   
   
   
       5 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that the two inclined planes ( 9 ,  10 ) of first V shape (V 1 ) of passageways ( 7 ,  8 ) are linked at their base by a flat longitudinal sole ( 6 ) the width of which accounts for approximately 6 to 10% of the total width of the two passageways. 
   
   
       6 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the flat part at the bottom of first V shape (V 1 ) of passageways ( 7 ,  8 ) acting as sole ( 6 ) has a width equal to 8% of the total width of the two passageways ( 7 ,  8 ).   
   
   
       7 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 sole ( 6 ) begins gradually from stem ( 4 ) to provide a uniform width of water inlet.   
   
   
       8 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the said sole is the lowest part of the profile of hull ( 1 ).   
   
   
       9 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the two inclined planes ( 9 ,  10 ) forming the first central V shape (V 1 ) of passageways ( 7 ,  8 ) has to be more inclined to form the first central V shape (V 1 ) that is narrower than the two other inclined parts ( 13 ,  14 ) which form second V shape (V 2 ).   
   
   
       10 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the angle of the inclined planes forming the V shape of the rail is between 40° and 60°.   
   
   
       11 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the angle of the inclined planes ( 13 ,  14 ) forming the V shape (V 2 ) of hull ( 1 ) bottom is between 55° and 75°.   
   
   
       12 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 passageways ( 7 ,  8 ) of rail ( 3 ) are parallel from stem ( 4 ) to transom ( 5 ) of hull ( 1 ); passageways ( 7 ,  8 ) of rail ( 3 ) are the same width from stem ( 4 ) to transom ( 5 ) of hull ( 1 ); passageways ( 7 ,  8 ) are the same depth from water inlet zone to transom ( 5 ) exit.   
   
   
       13 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the depth of the arches of passageways ( 7 ,  8 ) of rail ( 3 ) is approximately 8 to 14% the total width of the rail.   
   
   
       14 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the depth of the arches of rail passageways ( 7 ,  8 ) is 10% of the total width of rail ( 3 ).   
   
   
       15 . Hull ( 1 ) for sailing craft according to  claim 1  characterized in that
 the aforementioned hull comprises two other passageways ( 19 ,  20 ) parallel to first passageways ( 7 ,  8 ), these second passageways ( 19 ,  20 ) have a cross-sectional profile on both sides of the sole forming two inclined planes ( 21 ,  22 ) forming a third V shape (V 3 ) less inclined than the first V shape (V 1 ), these two inclined planes ( 21 ,  22 ) of the second passageways ( 19 ,  20 ) and third V shape passageway (V 3 ) are perfectly straight up to the beginning of the arcs of circle ( 23 ,  24 ) which form the arches of the aforesaid passageways ( 19 ,  20 ).   
   
   
       16 . Hull ( 1 ) for sailing craft according to  claim 15  characterized in that
 the depth of the arches of these passageways ( 19 , 20 ) is twice less deep than that of the first passageways.   
   
   
       17 . Hull ( 1 ) for sailing craft according to  claim 15  characterized in that
 the width of the arches of these second passageways is 1/12 to 1/30 the width of the hull.   
   
   
       18 . Hull ( 1 ) for sailing craft according to  claim 15  characterized in that
 the start of these second passageways ( 19 ,  20 ) is located one third along the hull from the prow to the poop or transom.