AU2006307968A1

AU2006307968A1 - Hull for sailing craft whereof the bottom enables water gliding performances to be enhanced

Info

Publication number: AU2006307968A1
Application number: AU2006307968A
Authority: AU
Inventors: Jean-Claude Chauveau; Olivier Petit
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-25
Filing date: 2006-10-17
Publication date: 2007-05-03
Also published as: JP2009512595A; EP1940678A1; CN101389525A; NO20082397L; EP1940678B1; ATE440769T1; FR2892375A1; WO2007048737A1; RU2008120362A; FR2892375B1; US20080216729A1; CA2626543A1; DE602006008818D1

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.

Description

VERIFICATION OF TRANSLATION File No. PCT/EP2006/067510 I, the undersigned, /) f\ of CSl N -- to i et 0c000 M am the translator of the document attached and I state that the following is a true translation to the best of my knowledge and belief. DATED this day of_, 2008. SIGNATURE OF TRANSLATOR 14/05/08,kn 17244 VerfTrans,l 1 5 10 "Hull for sailing craft whose bottom enables water gliding performances to be enhanced" 15 The invention concerns a hull for sailing craft enabling water-gliding performances to be enhanced. The hull according to the invention has a bottom with a particular profile 20 consisting of a rail shaped from the stem to the transom. Depending on the applications and the size of the sailing craft, the bottom can be adapted to incorporate one or more profiled rails. The hull is more especially intended for craft with one or more motors. The hull according to the invention avoids water spraying on the port and 25 starboard sides. The hull recovers this stream of water mixed with air bubbles. This mass is therefore compressible and is a good absorber of impacts on the hulls. This stream, which is directed exclusively aft of the transom, ensures fast uplift. The friction surface of the hull on the water is clearly decreased, and this 30 increases the speed of the craft for the same power. Compared to a conventional hull, fuel consumption is divided by two for the same speed after uplift has occurred. This eliminates the wave created by a conventional hull and the energy of this wave channeled under the hull with passageways improves the speed, the comfort 35 (blocking of air bubbles) and behaviour at sea (direction and roll) thanks to the passageways. The state of the art can be defined by the following patents: 2 DE 4210546: the hull has a tapered nose section, a middle section and an aft section ; each section is made of two symmetrical lateral sections joined at the keel weld line ; a poop completes the hull ; the mid-section can be cast from a single mould ; the gunwales are formed in an edge in order to link the deck and 5 the cabin ; the lateral sections have an inclined profile under the hull and have an enveloped line midway from the sides to provide a streamlined profile and stiffness. No separate cross-piece is required. USE/ADVANTAGE - small light craft, rowing boat, dinghy. Minimal use of stainless steel, low-cost construction, which does not require the use of crosspieces. 10 US-4.875.425: the invention describes a hull form for a vessel which hull form is deep-V based and is constructed and arranged for use in a displacement mode.; the hull includes a bow section which incorporates a plurality of lateral grooves or, alternatively, a single lateral formation and which extends below the 15 base or datum line of the hull in a streamlined teardrop configuration ; preferably, the hull has deep-V deadrise angles whose magnitude in the region of the transom of the hull is not less than 20%; the surfaces extending between the keel and the length of the water line are non-planar and have developable convex and concave geometry, all the lines of the aft parts of the hull have a 20 negative inclination between substantially 1/2 and substantially 4. The invention enables the known advantages of deep-V based hull forms to be used in displacement mode vessels having relatively large displacements where, heretofore, "round-bilge" hull forms very greatly predominated. 25 JP-600421187: SUBJECT: To eliminate the creation of stem waves and reduce the resistance to pressure of the wave by arranging symmetrical slats in the vicinity of the draught line and by eliminating the swirl of the stem waves with the point of the swirl produced by the said slats. COMPOSITION : A triangular symmetrical slat having a streamlined cross-section is fixed in the vicinity of the 30 hull draught line. The aforementioned slat extends forward, to the right and to the left of the bow ; The rear position and the width of the slat are designed so that the edge of the slat will come close to the front edge of the stem wave region to be generated as the hull moves forward ; as the hull progresses in direction (i), a circulation stream is generated around the cross-section of the 35 slat and isolated from the end of the slat to create the point of the swirl ; given that the rotary direction of the point of the swirl is reversed relative to the 3 rotation of the swirl created by the pressure of the wave, they will interact to cancel the swirl created by the pressure of the wave. US-5.522.333: the invention describes in a catamaran boat, with a propulsion 5 system, and main hull positioned to travel above the water surface, the hull extending longitudinally forward, the combination comprising : two pontoons, each spaced below the main hull, the pontoons extending forwardly ; support means carried by the main hull and carrying the pontoons, whereby the pontoons are at least mostly submerged below the water surface when the boat 10 is loaded and at rest ; the pontoons having associated chimes positioned to allow the pontoons to plane on the water surface at the typical planing speeds of the boat ; the support means having a streamlined leading edge structure and upper sponson structure ; and the support means having lateral thickness at a longitudinal location spaced at a level above the pontoons and which is less 15 than the maximum width of each of the pontoons at the longitudinal location. GB-2.383.779 : a vessel has a hull, the sided of which in cross-section form a V " shape with each side extending in a single plane to meet the other at the longitudinal central axis of the vessel ; the vessel also has a keel which extends 20 along the length of the hull and extends down from the point where the two sides meet; the angle (0, figure 4) formed between each side of the hull and the keel is equal to 120* ; this arrangement provides the vessel with improved buoyancy, stability and streamlining, when compared to conventional hull shapes. 25 US-2005/34647 : This invention is a specific technology which incorporates mechanical engineering and streamlining in order to allow the lower aft part of the hull of the vessel to fluctuate upwards and downwards in order to counterbalance the surface of the water and to stabilize the movement of the 30 vessel when this is navigating ; The invention also uses hinges in order to effectively assemble the poop and prow hulls and install shock absorbers during the design process in order to dampen the impact of external factors and streamline the overall movement of the vessel when this is moving. 35 FR-2.765.180 : The technical field of the invention is shipbuilding, more particularly the construction of ship hulls; It concerns a monohull with rear stabilizers, also called pseudo-trimaran, of a high speed vessel, comprising a 4 central float and two shorter lateral floats, located towards the rear of the central float and linked thereto by streamlined linking arms ; According to the invention, the hulls of the three floats are always partially immersed whatever the speed, the hull of the lateral floats comprising thin adjustable immersed keels and the 5 thickness ratio of the three underwater hulls is between 0.25 and 0.35, with a length over width ratio of between 12 and 20 and a ratio of the central hull length to the length of the lateral hulls of between 2.5 and 4.5. US 4 932 347: A jet ski hull comprising upper and lower sections joined along a 10 peripheral edge which edge is arranged to extend above the nominal waterline. According to the present invention, the lower hull section comprises : 1) a central section extending from the bow of the ski to the stern thereof, 2) a concave section on each side of the central section, 3) a pair of sidewalls joined to the upper hull section of the peripheral edge and 15 extending downwardly and inwardly from the peripheral edge and 4) a transition section joining the lower portion of each sidewall to a respective concave section. Each concave section defines a channel extending substantially the length of the hull for channeling water therethrough to prevent the hull from skidding during turns. 20 - In this patent, the central inclined planes do not terminate in two quarter-circle profiles. The hull for sailing craft has a bottom which has a special shape, the bottom is characterized by at least one rail shaped from the stem to the transom, the said rail being formed of a flat axial sole linking two parallel passageways from the stem to the 25 transom, of similar width, similar depth of water inlet zone at the exit from the transom, the passageways from the sole having a cross-sectional profile on either side of the sole to form two V-shaped inclined planes and terminated by two arc of quarter-circle profiles which are further extended by two other inclined planes forming a second V shape less inclined than the first and leading to the upper works, terminating in two flat 30 parts on the said gunwales. According to one embodiment, the width of the passageways varies according to the weight of the hull and the sailing craft application, depending on whether this is designed primarily for speed or not. The width of the aforesaid passageways is dimensioned to represent 1/3 to 35 40% the width of the hull. The two V-shaped inclined planes of the passageways are perfectly straight up to the beginning of the arcs of circle which form arches of the passageways.

5 The arches of the passageways form a quarter arc of a circle so that the central water stream and the air bubbles are well contained up to the rear of the hull, thus ensuring better sliding. The two V-shaped inclined planes of the passageways are connected at their 5 base by a flat longitudinal sole whose width accounts for approximately 6 to 10% of the total width of the two passageways. According to a preferred embodiment, the flat part at the bottom of the V shape of the passageways acting as sole has a width equal 10% of the total width of the two passageways. 10 This sole begins progressively from the stem in order to provide a uniform width of water inlet. The aforementioned sole is the lowest part of the hull profile. According to a preferred embodiment, the aforementioned sole is reinforced so as to absorb shocks. 15 The two inclined planes forming the central V shape of the passageways have to be inclined to form a central V shape which narrower than the two other inclined planes which form the second V. The angle of the inclined planes forming the V shape of the rail lies between 40* and 600. 20 The angle of the inclined planes forming the V shape of the hull bottom is between 550 and 750*. There is a difference between the two Vs of approximately 150*. The rail passageways are parallel from the stem to the transom of the hull. The rail passageways are the same width from the stem to the transom of the 25 hull. The passageways have the same depth of water inlet zone up to the transom exit. The depth of the arch of the rail passageways is approximately 8 to 14% of the total width of the rail. 30 The depth of the arch of the rail passageways is 10% of the total width of the rail. The passageways have to start at the prow of the hull. According to another embodiment, the hull comprises two other passageways parallel to the first passageways, these second passageways having a cross-sectional 35 profile on both sides of the sole forming two inclined planes forming a third V shape (V3) less inclined than first V shape (V1), these two inclined planes of the second 6 passageways, third passageway V shape (V3), are perfectly straight until the beginning of the arcs of circles forming the arches of the aforesaid passageways. The arches of these passageways are twice less deep than the first passageways. 5 The width of the arches of the second passageways is 1/12 to 1/30 of the width of the hull. The width of the arches of the first passageways is 1/24 to 1/60 of the width of the hull. The start of the second passageways is situated at the third length of the hull, 1o from the prow to the poop or transom. The second passageways which form the third V shape (V3) eliminate last lateral water projections. The drawings attached are given as examples and are not restrictive. They represent only one embodiment of the invention and will make it easy to understand. 15 Figure 1 is a view of the sailing craft, that is to say a front view of a boat. Figure 2 is a view of a boat seen from the side. Figure 3 is a view of the hull of a boat seen from below so as to highlight the rail shaped according to the invention. Figure 4 is a sectional view of all the volume of the boat highlighting in particular 20 the hull section, the rail section and the boat hull bottom section. Figure 5 is a view of the boat seen at the stem. Figure 6 is a view according to Figure 5 with the cut lines highlighting the profile of the bottom and in particular the profile of the rail according to the invention. Figure 7 is a view in perspective of the hull of the boat highlighting the hull 25 profile and in particular the rail. Figure 8 is a view according to figure 7 seen from other angle that highlights this particular shape of the rail. Figure 9 is a view in perspective of the hull of the boat, in particular at the level of the stem, and this to highlight the first part of the rail, the first part of the guidance 30 passageways, and the first part of the sole. Figure 10 is a simplified sectional view of the boat hull section highlighting the profile of the bottom and in particular the guidance rail. Figure 11 is a view in perspective of the underside of the boat hull seen from the prow. 35 Figure 12 is a view in perspective highlighting all the hull with the stem in the foreground. Figure 13 is a simplified view of the boat seen from the side.

7 Figure 14 is a simplified view of the boat seen from below. Figure 15 is a cross-sectional view of the second embodiment of the hull according to the invention. Figure 16 is a front view of the hull seen from the stem highlighting the trailing 5 lines. It highlights the two passageways on each side. Figure 17 is a side view of the hull according to the embodiment shown on Figure 15. Figure 18 is a top view of the hull with its trailing lines. Figure 19 is a top and perspective view of the hull. 10 Hull 1 for sailing craft has a bottom and a special profile. This bottom 2 is characterized by at least one rail 3 shaped from the stem to transom 5. Said rail 3 is made of a flat axial sole 6 joining two passageways 7 and 8 parallel from stem 4 to transom 5. 15 These passageways 7 and 8 are of the same width and depth of water inlet zone from stem 4 to transom 5. These two passageways 7 and 8 taken from the axial sole 6 have a sectional profile and on both sides of sole 6 form two inclined planes 9 and 10 forming first V, V1. These two inclined planes 9, 10 terminate in their upper part by two profiles forming arc 20 of circle 11 and 12 which are further extended by two other inclined parts 13 and 14 forming a second V, V2, less inclined than the first V1, the said inclined parts 13, 14 leading to upper works 15 and 16. These inclined parts 13, 14 leading to upper works 15 and 16 terminate in two flat parts 17 and 18. 25 Width B of passageways 7, 8 have a dimension which represents 1/3 to 40% of width A of the hull. The two inclined planes 9 and 10 which form the first V shape V1 of passageways 7, 8 are perfectly straight up to the start of profiles 11 and 12 in an arc or a circle which forms the arches of passageways 7, 8. 30 The arches of passageways 7, 8 have a quarter arc of a circle form so that the central waterstream and the air bubbles are well contained up to the rear of the hull to ensure better sliding. The mixture of air bubbles and water makes it possible for this mass to be compressed and therefore better able to absorb impacts. 35 Thus, the sailing craft absorbs the waves better whether at low speed or high speed.

8 The two V-shaped inclined planes 9 and 10 of the passageways are interconnected at the base by a sole 6. This flat longitudinal sole 6 is approximately 6 to 10% of the total width of the two passageways, that is to say B. 5 According to the embodiment shown on figure 4, the width of sole 6 accounts for 8% compared to the total width of the two passageways, referenced B on figure 4. This sole 6 begins gradually from stem 4 to provide a uniform width of water inlet. The start of sole 6 can be seen at the level of the stem on figures 9, 11 and 12. 10 Sole 6 can of course be reinforced by various materials in order to absorb impacts. This sole 6 can act as the stranding sole. Two inclined planes 9 and 10 forming the.central V shape referenced V1 on figure 10 forming the central V shape of the passageways has to have a greater 15 inclination to form a central V1 that is narrower than the two other inclined parts 13 and 14 which form the second V, that is to say V2 referenced on figure 2. The angle of inclined planes 9 and 10 forming the V shape V1 of the rail is between 40* and 600. The angle of inclined parts 13 and 14 forming the V shape V2 is between 550 20 and 750. As highlights figure 4, the difference in the angle P between V1 and V2 is approximately 150*. As shown on the various figures, passageways 7, 8 of rail 3 are the same width from stem 4 to transom 5. 25 Passageways 7, 8 are the same depth from the water inlet zone to transom 5 exit. The start of passageways 7, 8 shown in particular on figure 12 highlights that these have to start at the prow or stem 4. The depth of the arches of the passageways of the rail is approximately 8 to 30 14% of the total width of the rail, that is to say B. According to a preferred embodiment, the depths of the arch of the passageways of the rails is 10% of the total width of the rail, that is to say B. The sailing craft can be a boat with motor, sailboat, hydroplane, sea scooter or jet ski. 35 Figures 15 to 19 highlight an embodiment that includes two other passageways 19 and 20, these second passageways 19 and 20 being parallel to the first passageways 7 and 8.

9 These second passageways 19 and 20 have a cross-section on both sides of the sole to form two inclined planes 21 and 22 forming third V shape (V3), these inclined planes 21 and 22 being perfectly straight until to the start of the arc of circle profiles 23, 24 which form the arches of passageways 19 and 20. 5 The two inclined planes 21 and 22 are less inclined than planes 9 and 10 forming the first V shape (V1). The depths of the arches of these passageways 19 and 20 is twice less deep than first passageways 7 and 8, the width of the arches of these arc of circled profiles 23, 24 of the second passageways is 1/12 to 1/30 of widths of the hull. 10 The start of the second passageways 19 and 20 is situated one-third along the hull from the prow to the poop or transom.

10 REFERENCES 1. Hull 2. Bottom 5 3. Rail 4. Stem 5. Transom 6. Axial sole 7. Passageway 10 8. Passageway 9. Inclined plane 10. Inclined plane First V shape: V1 11. Arc of circle profile 15 12. Arc of circle 13. Inclined part Forming V2 14. Inclined part Forming V2 Second V shape: V2 15. 16. Upper works 20 17. Flat part 18. Flat part B. Width of passageways A. Width of hull (bottom) third V 0: 150 angle difference in V1 and V2 25 Third V shape: V3 19. Passageway 20. Passageway 21. Inclined plane of third V shape (V3) 22. Inclined plane of third V shape (V3) 30 23. Arc of circle profile 24. Arc of circle profile

Claims

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 5 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 (V1) 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 10 shape (V2), 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 1/3 to 40% of the width of hull (1).

3. Hull (1) for sailing craft according to claim 1 characterized in that 15 two inclined planes (9, 10) of the first V shape (V1) 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 any of claims 1 to 3 characterized in that, the arches of passageways (7, 8) have an arc of quarter circle form so that the 20 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 any of claims 1 to 3 characterized in that the two inclined planes (9, 10) of first V shape (V1) of passageways (7, 8) are linked at their base by a flat longitudinal sole (6) the width of which accounts for approximately 6 25 to 10% of the total width of the two passageways.

6. Hull (1) for sailing craft according to any of claims 1 to 5 characterized in that the flat part at the bottom of first V shape (Vi) 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 30 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 (V1) of 35 passageways (7, 8) has to be more inclined to form the first central V shape (V1) that is narrower than the two other inclined parts (13, 14) which form second V shape (V2).

10. Hull (1) for sailing craft according to claim 1 characterized in that 12 the angle of the inclined planes forming the V shape of the rail is between 40* and 600.

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 (V2) of hull (1) 5 bottom is between 550 and 750*.

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) 10 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 15 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 20 profile on both sides of the sole forming two inclined planes (21, 22) forming a third V shape (V3) less inclined than the first V shape (V1), these two inclined planes (21, 22) of the second passageways (19, 20) and third V shape passageway (V3) are perfectly straight up to the beginning of the arcs of circle (23, 24) which form the arches of the aforesaid passageways (19, 20). 25

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 30 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.