FR2464177A1 - Low draught hull for marine planing craft - has transverse slot aspiring air to deliver layer below hull stern - Google Patents
Low draught hull for marine planing craft - has transverse slot aspiring air to deliver layer below hull stern Download PDFInfo
- Publication number
- FR2464177A1 FR2464177A1 FR7921971A FR7921971A FR2464177A1 FR 2464177 A1 FR2464177 A1 FR 2464177A1 FR 7921971 A FR7921971 A FR 7921971A FR 7921971 A FR7921971 A FR 7921971A FR 2464177 A1 FR2464177 A1 FR 2464177A1
- Authority
- FR
- France
- Prior art keywords
- hull
- air
- slot
- water
- lower side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B5/00—Hulls characterised by their construction of non-metallic material
- B63B5/24—Hulls characterised by their construction of non-metallic material made predominantly of plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/70—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by using moulds; Moulds or plugs therefor
- B63B73/72—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by using moulds; Moulds or plugs therefor characterised by plastic moulding, e.g. injection moulding, extrusion moulding or blow moulding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Améliorations concernant les coques de bateaux.Improvements regarding boat hulls.
Cette invention concerne les coques de bateaux et plus particulièrement les coques planantes peu profondes.This invention relates to boat hulls and more particularly shallow planing hulls.
Le but de cette invention est de fabriquer une coque de bateau qui réduirait la friction entre le fond de la coque et l'eau.The object of this invention is to manufacture a boat hull which would reduce the friction between the bottom of the hull and the water.
D'après cette invention, il y a une coque qui comprend une partie à l'avant ainsi qu'une partie à l'arrière avec une fente transversale située en-dessous, entre ces dites parties. Un passage d'air part de la fente qui remonte au-dessus du niveau d'eau sur la coque lorsqu'elle flotte.According to this invention, there is a shell which comprises a part at the front as well as a part at the rear with a transverse slot situated below, between these said parts. An air passage leaves the slit which rises above the water level on the hull when it floats.
La partie située directement à l'avant de la fente qui se trouve plus en-dessous du niveau d'eau que la partie directement à l'arrière de la fente, est conçue de telle façon que lorsque le bateau avance dans l'eau, de l'air est aspiré par le dit passage et ressort par la fente, entre le côté inférieur de la partie arrière de la coque et l'eau.The part located directly in front of the slit which is more below the water level than the part directly aft of the slit, is designed in such a way that when the boat advances in the water, air is sucked in through said passage and exits through the slot, between the lower side of the rear part of the hull and the water.
Préférablement, la tangente au côté inférieur de la partie arrière adjacente à la fente est inclinée vers le haut et vers l'arrière par rapport à la tangente au côté inférieur de la partie avant adjacente à la fente. Preferably, the tangent to the lower side of the rear part adjacent to the slot is inclined upward and backward relative to the tangent to the lower side of the front part adjacent to the slot.
De préférence encore, l'air passe en-dessous de la partie arrière en une couche s'étendant, pour le moins, sur une grande partie de la largeur de la coque. Le côté inférieur de la coque peut être légèrement concave ou, vue transversalement, celle-ci peut avoir la forme d'un V peu profond, chaque bras de ce V étant un peu concave.More preferably, the air passes below the rear part in a layer extending, at least, over a large part of the width of the hull. The lower side of the shell can be slightly concave or, seen transversely, it can have the shape of a shallow V, each arm of this V being a little concave.
Afin de réduire la tendance de l'air à se transformer en bulles, la surface inférieure de la coque peut être traitée de manière à repousser l'eau ou à retenir l'air.To reduce the tendency of air to turn into bubbles, the bottom surface of the shell can be treated to repel water or retain air.
Les détails de cette invention ne seront pas décrits par des exemples, mais par des références aux dessins ci-joints
La fig. I montre une coque en coupe verticale d'avant en
arrière.The details of this invention will not be described by examples, but by references to the accompanying drawings
Fig. I shows a hull in vertical section from before
back.
La fig. 2 est une élevation vue de face.Fig. 2 is a front view elevation.
La fig. 3 est une élevation vue de l'arrière.Fig. 3 is an elevation seen from the rear.
A la base, la coque est en plastique moulé, ayant une partie 3 à l'avant du point maximum de profondeur, et une partie arrière 5, ainsi qu'une fente ou canal 7 qui traverse la coque entre ces parties. Directement à l'avant de la fente 7, la partie 3 se trouve plus en-dessous du niveau d'eau 9 que la partie 5 qui se trouve, elle, directement à l'arrière de la fente ; la marche intermédiaire peut être d'une profondeur de I7 mm pour une coque de 3,3 m . I1 existe également une différence dans l'inclinaison des parties, la tangente de la partie arrière adjacente à la fente 7 se trouvant déplacée de quelque 50 vers le haut ( voir fig. 1), par rapport à la tangente de la partie avant adjacente à la fente 7.Dans des bateaux de tailles différentes, et selon la vitesse de déplacement voulue, la profondeur de la marche et l'angle pourront être modifiés. Si on le désire, un pan métallique 15 peut être placé transversalement sous la coque.At the base, the shell is made of molded plastic, having a part 3 at the front of the maximum point of depth, and a rear part 5, as well as a slot or channel 7 which crosses the shell between these parts. Directly at the front of the slot 7, the part 3 is located more below the water level 9 than the part 5 which is itself directly at the rear of the slot; the intermediate step can be I7 mm deep for a 3.3 m hull. There is also a difference in the inclination of the parts, the tangent of the rear part adjacent to the slot 7 being displaced by some 50 upwards (see fig. 1), relative to the tangent of the front part adjacent to slot 7. In boats of different sizes, and depending on the desired speed, the tread depth and the angle can be modified. If desired, a metal panel 15 can be placed transversely under the hull.
Ce pan se situe en-dessous de la fente, de manière à laisser une brèche I7 face à l'arrière.This section is located below the slot, so as to leave a gap I7 facing the rear.
Un conduit 11 relie la fente 7 au pont 13 de la coque bien qu'il soit suffisant que le conduit s'étende seulement au-dessus du niveau d'eau 9.A duct 11 connects the slot 7 to the deck 13 of the hull, although it is sufficient for the duct to extend only above the water level 9.
Le côté inférieur de la partie avant est conçu de telle façon que lorsque le bateau avance dans l'eau à une vitesse déterminée, de l'air est aspiré, à pression normale, jusqu'à la fente. Cet air ressort ensuite par la brèche 17 en-dessous de la partie arrière 5 en une couche qui s'étend sur une grande partie du bateau et vers l'arrière. Le dessous de la partie 5 est recouvert d'un matériau à base de silicones qui repousse l'eau et réduit ainsi la tendance de l'air à se transformer en bulles. Dans un autre cas, le côté inférieur
de la partie 5 peut être recouvert d'un matériau dont les fibres courtes repoussent l'eau, afin d'atteindre le même objectif : retenir l'air et repousser l'eau.The lower side of the front part is designed in such a way that when the boat advances in the water at a determined speed, air is sucked in, at normal pressure, up to the slit. This air then exits through the gap 17 below the rear part 5 in a layer which extends over a large part of the boat and towards the rear. The underside of part 5 is covered with a silicone-based material which repels water and thus reduces the tendency of air to turn into bubbles. In another case, the lower side
of part 5 can be covered with a material whose short fibers repel water, in order to achieve the same objective: retaining air and repelling water.
Le côté inférieur de la coque a la forme d'un V peu profond, chaque bras du V étant légèrement concave. Cette forme dans la partie avant a pour effet de soulever le bateau, ce qui lui donne un angle d'attaque plus efficace. De plus, la partie avant en coupe de V lui apporte une stabilité inhérente lorsque le bateau penche d'un côté, le côté le plus bas est plus avantagé par l'effet de soulèvement que ne l'est le côté le plus haut: le bateau se trouve ainsi stabilisé.The underside of the shell has the shape of a shallow V, each arm of the V being slightly concave. This shape in the front part has the effect of lifting the boat, which gives it a more effective angle of attack. In addition, the V-shaped front part gives it an inherent stability when the boat leans to one side, the lower side is more advantageous by the lifting effect than is the highest side: the boat is thus stabilized.
Cependant, une telle construction n'est pas indispensable; le côté inférieur de la coque peut être plat ou légèrement concave.However, such a construction is not essential; the underside of the shell can be flat or slightly concave.
La coque du bateau est moulée en polyester, mais il est aussi possible d'utiliser d'autres matériaux et méthodes de construction adéquates. The hull of the boat is molded in polyester, but it is also possible to use other suitable materials and construction methods.
pas
Même s'il n'est / possible d'éviter la transformation de la couche d'air en bulles, on pense qu'un"tapis" de bulles, prés du côté inférieur de la coque, réduirait néanmoins avantageusement la friction sur la surface de la coque ainsi que la quantité d'énergie perdue dans le déplacement et l'agitation créés par l'eau. not
Even if it is / impossible to avoid the transformation of the air layer into bubbles, it is believed that a "carpet" of bubbles, near the underside of the shell, would nevertheless advantageously reduce friction on the surface. of the hull as well as the amount of energy lost in the displacement and the agitation created by the water.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7921971A FR2464177A1 (en) | 1979-08-30 | 1979-08-30 | Low draught hull for marine planing craft - has transverse slot aspiring air to deliver layer below hull stern |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7921971A FR2464177A1 (en) | 1979-08-30 | 1979-08-30 | Low draught hull for marine planing craft - has transverse slot aspiring air to deliver layer below hull stern |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2464177A1 true FR2464177A1 (en) | 1981-03-06 |
FR2464177B3 FR2464177B3 (en) | 1983-08-26 |
Family
ID=9229296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7921971A Granted FR2464177A1 (en) | 1979-08-30 | 1979-08-30 | Low draught hull for marine planing craft - has transverse slot aspiring air to deliver layer below hull stern |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2464177A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984001338A1 (en) * | 1982-10-06 | 1984-04-12 | Manche Atel Chantiers | Fast boat |
-
1979
- 1979-08-30 FR FR7921971A patent/FR2464177A1/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984001338A1 (en) * | 1982-10-06 | 1984-04-12 | Manche Atel Chantiers | Fast boat |
FR2534221A2 (en) * | 1982-10-06 | 1984-04-13 | Manche Atel Chantiers | DEVICE FOR PROPULSION AND DIRECTION OF A SHIP |
EP0105819A1 (en) * | 1982-10-06 | 1984-04-18 | Groupement D'etudes Et De Recherches Navales (G.E.R.N.) | Fast boat |
Also Published As
Publication number | Publication date |
---|---|
FR2464177B3 (en) | 1983-08-26 |
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