FR2477500A1

FR2477500A1 - Stabilised boat hull shape - has stable broad low beam and angled lee boards to increase stability of hulls

Info

Publication number: FR2477500A1
Application number: FR8005115A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-03-07
Filing date: 1980-03-07
Publication date: 1981-09-11

Abstract

The hull has a base which has a broader beam than that existing at the deck level to increase the hull stability. Lee boards (5) are fitted to either side of the hull. The boards are fitted at an angle so as to have the maximum effect when the hull has heeled over. The weather board also increases the vessel stability. The angle of the board generates a venturi below the hull which causes acceleration of the water at the central point (6). The effect is to reduce the surface area of the vessel in contact with the water. In multi hulled craft the joining beam can take on an aerofoil profile.

Description

Perfectionnement aux coques de bateaux . voiles ou à moteurs.Improvement in boat hulls. sails or motor.

L présente invention concerne un perfectionreent apporté aux coques de bateaux e voiles ou È. moteurs. Les coques de bateaux, telles qu'elles sont conçues habituellement, pénètrent plus ou moins dans l'eau, ce qui provoque le déplacement d'un volume d'eau, plus ou moins important, qui s'oppose i l'avancement de ce bateau. Le moindre volume d'eau déplacé n'est jamais négligeable du fait que, ce volume d'eau se trouve multiplié -oar le phénomène du déplacement d'onde. On se rend parfaitement compte
de ce phénomène lorsque, sur un cours d'eau, les ondes provoquées par le passage d'un bateau, viennent battre la rive.The present invention relates to an improvement made to the hulls of ships with sails or È. engines. The hulls of boats, as they are usually designed, penetrate more or less into the water, which causes the displacement of a volume of water, more or less important, which is opposed to the advancement of this boat. The smallest volume of water displaced is never negligible because, this volume of water is multiplied by the phenomenon of wave displacement. We are perfectly aware
of this phenomenon when, on a watercourse, the waves caused by the passage of a boat, come to beat the shore.

Le perfectionnement, objet de cette invention, permet de remédier à cet inconvénient, ;ouisqutil permet au bateau de se déplacer "sur l'eau" au lieu de "dans l'eau11, ce qui entraine différents avantages, dont une plus grande stabilité, la suppression du déplacement d'un grand volume d'eau et, de ce fait, une réduction importante du freinage occasionné par ce déplacement.The improvement which is the subject of this invention makes it possible to remedy this drawback; the removal of the displacement of a large volume of water and, therefore, a significant reduction in the braking caused by this displacement.

La description qui va suivre, aidée du dessin ci-annexé, permettra de bien comprendre l'invention : au contraire des coques classiques cette coque 1 a son fond 2 plus large que son pont 3, cette particuliarité permettant d'obtenir une plus grande stabilit+t une plus grande surface en contact avec l'élément liquide, ce qui diminue sa pénétration dans le-dit élément, pénétration qui entraine le déplacement d'un volume d'eau proportionnel à cette pénétration. The description which follows, helped by the appended drawing, will allow a good understanding of the invention: unlike conventional hulls this hull 1 has its bottom 2 wider than its deck 3, this particularity making it possible to obtain greater stability. + t a larger surface in contact with the liquid element, which reduces its penetration into the said element, penetration which causes the displacement of a volume of water proportional to this penetration.

De chaque coté de la coque 7 sont disposées les dérives 4 & 5, installées de façon à ce qu'elles forment un angle fermé avec le fond 2 de la coque1
Cette façon d'installer les dérives 4 & 5 avec un angle fermé par rapport au fond 2 da la coque (, permet à l'eau, dans le cas d'un vent de travers venant, par exemple, du côté de la dérive 4 (ce qui entraine un dérapage du bateau dans ce sens) de provoquer un effet de poussée, de bas vers le haut, sur la dérive 5, pendant que la dérive 4 jouera un rôle contraire en pénétrant dans l'eau comme le ferait une bêche.Il est facile de comprendre que les efforts opposes, et complémentaires, des dérives 4 & 5, concourrent i la stabilité de cette coque, d'où un plus grand confort et une sécurité accrue pour ltéauipage. On each side of the hull 7 are arranged the daggerboards 4 & 5, installed so that they form a closed angle with the bottom 2 of the hull1
This way of installing daggerboards 4 & 5 with a closed angle with respect to the bottom 2 of the hull (, allows water, in the case of a cross wind coming, for example, from the side of the daggerboard 4 (which causes the boat to skid in this direction) to cause a pushing effect, from bottom to top, on the fin 5, while the fin 4 will play a contrary role by entering the water as would a spade .It is easy to understand that the opposite and complementary efforts of daggerboards 4 & 5, contribute to the stability of this hull, hence greater comfort and increased safety for the handling.

Ainsi qu'on peut le voir aux figures 2 & 3, on a donné au fond 2, et à la face interne des dérives 4 & 5, un galbe qui amène à la crLation d'un venturi provocant en 6 une accelération du passage de l'élment liauide sous la coque 7 qui aide d'une façon appréciable la progression de celle ci, u lieu de la freiner, comme il en est habituellement; il est donc possible d'envisager que l'association des effets du venturi et de la disposition des dérives 4 8: 5, errettra au bateau él-boré à partir d'une telle coque, lorsqu'il aura atteint une certaine vitesse, de n'avoir ou'une surface minimale en contact avec l'élément liouide.As can be seen in Figures 2 & 3, we gave the bottom 2, and the inner face of the daggerboards 4 & 5, a curve which leads to the creation of a venturi causing in 6 an acceleration of the passage of the fluid element under the shell 7 which appreciably helps the progression of the latter, instead of braking it, as is usually the case; it is therefore possible to envisage that the association of the effects of the venturi and the arrangement of the daggerboards 4 8: 5, will err in the boat crafted from such a hull, when it has reached a certain speed, have only a minimal surface in contact with the liquid element.

Dans le cas des bateaux rulticoques (catamarans et trimarans) il est loisible d'envisager des poutres de liaison dcoulant de la raeme technique, c'est à dire que ces routres de liaison auront leur dessous semblable au dessous des ailes d'avions et de glaneurs, cette disposition apportant une aide supplémentaire au bateau pour se libérer, autant que faire se peut, de l'opposition de l'élément liquide à son avancement du fait de l'effet de poussée du bas vers le haut, provoqué par le passage de l'air sous de telles poutres de liaison.In the case of multi-hull boats (catamarans and trimarans) it is possible to consider connecting beams flowing from the technical reme, that is to say that these connecting routers will have their underside similar to the underside of aircraft wings and gleaners, this provision providing additional help to the boat to free itself, as much as possible, from the opposition of the liquid element to its advancement due to the pushing effect from the bottom up, caused by the passage air under such connecting beams.

I1 est naturellement sous entendu que, l'invention ne se limite pas à ce qui a té plus spécialement décrit dans ce qui précède, et montré au dessin, elle en comprend toutes les variantes, y compris l'installation d'une quille sous la coque si cela s'avère nécessaire; de plus, il n'y a aucune limitation tant dans les dimensions des réalisations que dans le choix des matériaux, et leur présentation, ainsi que pour le mode de propulsion de ce type de coque : voile(s), moteur(s) à hélice ou autres. It is naturally understood that the invention is not limited to what has been more particularly described in the foregoing, and shown in the drawing, it includes all the variants thereof, including the installation of a keel under the shell if necessary; moreover, there is no limitation as much in the dimensions of the achievements as in the choice of materials, and their presentation, as well as for the mode of propulsion of this type of hull: sail (s), engine (s) to propeller or others.

Claims

1 - Improvement to hulls of sailboats or motorboats

allow these boats to progress "on the water" instead of

"in the water", monohull and multihull boats.

2 - according to claim 1:

improvement bringing to these cuckold a greater str-tility.

v - according to the. claim 1

improvement allowing these hulls to reduce, if not

eliminate, their displacement of water.

4 - according to claim 3:

improvement creating, under the hull, a venturi which will help its

progression in water.

5 - according to claim 4:

the venturi will help the water to move the boat forward, instead of

braking it like this usually happens.

6 - according to claim 2

stability is obtained with the help of two daggerboards placed on the side

on the other side of the hull.

7 - according to claim 6

the two daggerboards placed on either side of the hull: in the

in case of a side wind skid, ltune receives a thrust of

bottom up, the other enters the water as one would

spade.

- according to claim 7:

the falt that a drift receives a push from the bottom up,

making the other go into the water like a beak, increase

the safety of the boat and its crew.

9 - according to claim 4

the fact that a venturi was created under the hull does not prevent the

possibility of installing a keel under this hull; 10 - according to claim 1

in the case of multihulls their hulls could be assembled

rar a goat whose underside is inspired by the underside of the wings

seniors or thieves.

11 - according to claim 10

the air passing under this profile would have a pushing effect which helps

would reduce the pressure from boat to boat.