EP1196319A1 - Towed line floater - Google Patents

Towed line floater

Info

Publication number
EP1196319A1
EP1196319A1 EP00951673A EP00951673A EP1196319A1 EP 1196319 A1 EP1196319 A1 EP 1196319A1 EP 00951673 A EP00951673 A EP 00951673A EP 00951673 A EP00951673 A EP 00951673A EP 1196319 A1 EP1196319 A1 EP 1196319A1
Authority
EP
European Patent Office
Prior art keywords
float
horizontal
float according
horizontal portion
line
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
Application number
EP00951673A
Other languages
German (de)
French (fr)
Other versions
EP1196319B1 (en
Inventor
Philippe Hocquet
Loic Pierre Boudet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westerngeco AS
Original Assignee
Geco AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Geco AS filed Critical Geco AS
Publication of EP1196319A1 publication Critical patent/EP1196319A1/en
Application granted granted Critical
Publication of EP1196319B1 publication Critical patent/EP1196319B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/42—Towed underwater vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables

Definitions

  • This invention relates to a touchline float, the field of application of which is generally seismic measurements at sea, in which a battery of lines carrying acoustic sensors is touched at the stern of a ship.
  • Each of the lines includes a deflector in front of the sensors, which is a submerged and vertical wing which undergoes a transverse lift and maintains the line next to the wake of the ship, and a float to which the deflector is suspended and whose purpose is to prevent the line to sink under the weight of the deflector.
  • the floats must be not very sensitive to the disturbances which inflicts on them in particular the swell. We regret on this subject that the known floats oscillate too easily in a vertical direction according to the movements of the swell.
  • the suspension line from the deflector to the float is subjected to periodic overvoltages which can end by breaking it by fatigue or creating damage at the attachment points, and the quality of the measurements can also be disturbed.
  • the float which will be described later overcomes this drawback while having good road stability, especially in its best embodiment.
  • the known floats have a tapered shape, swollen in the center and gradually tapering towards the ends.
  • the float according to the invention comprises a horizontal portion of floating body whose the shape is also substantially tapered, but also an upper portion of floating body, extending from the horizontal portion upward and may have substantially uniform horizontal cross sections; in addition, the horizontal portion is completely submerged and the upper portion is partially emerged when the float supports the line, or a heavy element thereof.
  • the vertical movement of the swell therefore mainly results in a variation in the immersion of the upper portion without exerting any noticeable force on the float because of the uniformity of its section and the little variation in the submerged volume: the vertical movement oscillating float and its load therefore does not have the opportunity to appear at large amplitude.
  • Stability is even better if the upper portion rises behind the horizontal portion, and especially if the deflector suspension member is located in front of the upper portion. If this suspension member comprises a single articulation of transverse axis, the float is retained against the rolling movements and returns more easily in place.
  • the float handling is improved if its horizontal portion is wider than it is high, which makes it possible to reduce its lateral projected surface, therefore the lateral disturbing forces.
  • Figure 1 is a side view of the float
  • Figure 2 is a top view of the float
  • Figure 3 is a section of the float across line III-III.
  • FIG. 1 A part of the line touched for seismic measurements is represented in FIG. 1. It comprises, on one side and the other of a submerged deflector 1, a portion of front line 2 attached to a vessel situated on the left and a portion rear line 3 to which are attached sensors located on the right (outside the figure).
  • a line bypass 4 connects the front and rear portions 2 and 3 bypassing the deflector 1, and is used for the transmission of the signal from the sensors to the ship.
  • the deflector 1 is maintained at a substantially constant depth thanks to a float 5, characteristic of the invention, preventing it from being damaged, to which it is suspended by a cable or a chain 18.
  • the float 5 comprises a horizontal and lower portion of the floating body called here spindle 6 and an upper vertical portion of the floating body called the leg 7.
  • the spindle 6 has: a front portion 8 intended to promote penetration into the water and which is therefore tapers forward, to a rounded tip 9; a middle portion 10 of substantially uniform section; and a rear portion 11 tapering towards the rear, a bottom surface 12 of the spindle 6 undergoing at this point an ascending recess 13 to escape upwards and form a concavity for housing a vertical fin 14; other fins, horizontal, 15 are placed on the sides of the spindle 6.
  • the horizontal fins 15 are disadvantageous in that they increase the transverse size of the float 5, but they can be made removable or retractable to retract them when the float 5 is stored on board the ship. It is advantageous that the straight sections of the spindle 6 are substantially rectangular and that its faces are limited by edges 24 forming almost sharp angles, as illustrated in FIG. 3.
  • the bottom 12 is flat over a large part of the length, in particular under the middle part 10, and the upper surface of the spindle 6 forms a flat upper bridge 16 at the location of the middle part 10 and the rear part 11.
  • the leg 7 is advantageously at the rear of the spindle 6 and extends substantially over half of its length, substantially over the entire rear part 11 and over half of the middle part 10.
  • a suspension member 17 of the deflector 1 by the chain 18 is attached to the bottom 12, and comprises a flange 19 fixed to the spindle 6, a connecting rod 20 connected to the chain 18 and an articulation 25 of transverse axis between them, which therefore allows the connecting rod 20 to oscillate from front to back but not laterally, so that the deflector 1 helps stabilize the float 5 against rolling movements by restricting its rotation around the longitudinal axis.
  • a safety chain 26 could still unite the deflector 1 with the flange 19 and support the latter if the suspension member 17 broke.
  • the connecting rod 20 may include a shock absorber.
  • the leg 7 is, substantially, half submerged under the surface E of the water and comprises a front portion 21 rounded in a half-cylinder to promote penetration, and a rear portion 22 formed by two sides meeting at an edge 23 located in back.
  • the leg 7 is smooth, with substantially identical horizontal cross sections, in order to limit the forces produced by the vertical movements of the swell.
  • the mechanical principle sought more generally consists in making the natural frequency of heaving (vertical oscillatory movement) of the float 5 close to a value where the movements of the swell exert only a minimal effort, which attenuates the efforts on the suspension member 17.
  • the dimensions of the spindle 6 and the cross section of the leg 7 can be chosen accordingly, as a function of the results of numerical simulations or of basin tests.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

The invention concerns a floater comprising a pod (6) similar to standard floaters, but in this particular case with a strut (7) mounted thereon such that the pod is entirely submerged. Such an arrangement, combined with other secondary ones, enables to reduce vertical oscillations of the floater caused by the swell while providing it with suitable stability towards other perturbations. Thus, a structure (1) suspended to the floater (5) and forming part of a line (2, 3) towed by a ship remains at a constant depth. The invention is applicable, for instance, to seismic tests at sea.

Description

FLOTTEUR DE LIGNE TOUÉE TOUCHED LINE FLOAT
DESCRIPTIONDESCRIPTION
Cette invention concerne un flotteur de ligne touée, dont le domaine d'application est généralement les mesures sismiques en mer, dans lesquelles une batterie de lignes porteuses de capteurs acoustiques est touée à la poupe d'un navire. Chacune des lignes comprend un déflecteur en avant des capteurs, qui est une aile immergée et verticale qui subit une portance transversale et maintient la ligne à côté du sillage du navire, et un flotteur auquel le déflecteur est suspendu et dont le but est d'empêcher la ligne de s'enfoncer sous le poids du déflecteur.This invention relates to a touchline float, the field of application of which is generally seismic measurements at sea, in which a battery of lines carrying acoustic sensors is touched at the stern of a ship. Each of the lines includes a deflector in front of the sensors, which is a submerged and vertical wing which undergoes a transverse lift and maintains the line next to the wake of the ship, and a float to which the deflector is suspended and whose purpose is to prevent the line to sink under the weight of the deflector.
Les flotteurs doivent être peu sensibles aux perturbations que leur inflige notamment la houle. On regrette à ce sujet que les flotteurs connus oscillent trop facilement en direction verticale suivant les mouvements de la houle. La ligne de suspension du déflecteur au flotteur est soumise à des surtensions périodiques qui peuvent finir par la rompre par fatigue ou créer des dommages aux points d'attache, et la qualité des mesures peut aussi être perturbée. Le flotteur qui sera décrit plus loin remédie à cet inconvénient tout en possédant une bonne stabilité de route, surtout dans sa meilleure réalisation.The floats must be not very sensitive to the disturbances which inflicts on them in particular the swell. We regret on this subject that the known floats oscillate too easily in a vertical direction according to the movements of the swell. The suspension line from the deflector to the float is subjected to periodic overvoltages which can end by breaking it by fatigue or creating damage at the attachment points, and the quality of the measurements can also be disturbed. The float which will be described later overcomes this drawback while having good road stability, especially in its best embodiment.
Les flotteurs connus ont une forme fuselée, renflée au centre et s 'effilant progressivement vers les extrémités. Le flotteur conforme à l'invention comprend une portion horizontale de corps flottant dont la forme est également sensiblement fuselée, mais aussi une portion supérieure de corps flottant, s 'étendant de la portion horizontale vers le haut et pouvant présenter des sections droites horizontales sensiblement uniformes ; de plus, la portion horizontale est immergée complètement et la portion supérieure est partiellement émergée quand le flotteur soutient la ligne, ou un élément pesant de celle-ci.The known floats have a tapered shape, swollen in the center and gradually tapering towards the ends. The float according to the invention comprises a horizontal portion of floating body whose the shape is also substantially tapered, but also an upper portion of floating body, extending from the horizontal portion upward and may have substantially uniform horizontal cross sections; in addition, the horizontal portion is completely submerged and the upper portion is partially emerged when the float supports the line, or a heavy element thereof.
Le mouvement vertical de la houle se traduit donc surtout par une variation de l'immersion de la portion supérieure sans exercer de force notable sur le flotteur à cause de l'uniformité de sa section et du peu de variation du volume immergé : le mouvement vertical oscillant du flotteur et de sa charge n'a donc pas l'occasion d'apparaître à grande amplitude.The vertical movement of the swell therefore mainly results in a variation in the immersion of the upper portion without exerting any noticeable force on the float because of the uniformity of its section and the little variation in the submerged volume: the vertical movement oscillating float and its load therefore does not have the opportunity to appear at large amplitude.
La stabilité est encore meilleure si la portion supérieure s'élève en arrière de la portion horizontale, et surtout si l'organe de suspension du déflecteur est situé en avant de la portion supérieure. Si cet organe de suspension comprend une unique articulation d'axe transversal, le flotteur est retenu contre les mouvements de roulis et revient plus facilement en place.Stability is even better if the upper portion rises behind the horizontal portion, and especially if the deflector suspension member is located in front of the upper portion. If this suspension member comprises a single articulation of transverse axis, the float is retained against the rolling movements and returns more easily in place.
La tenue de route du flotteur est améliorée si sa portion horizontale est plus large que haute, ce qui permet de diminuer sa surface projetée latérale, donc les efforts perturbateurs latéraux.The float handling is improved if its horizontal portion is wider than it is high, which makes it possible to reduce its lateral projected surface, therefore the lateral disturbing forces.
L'invention va maintenant être décrite à l'aide des figures suivantes qui en représentent une réalisation :The invention will now be described with the aid of the following figures which show an embodiment of it:
" La figure 1 est une vue de côté du flotteur, " La figure 2 est une vue de dessus du flotteur, " Et la figure 3 est une coupe du flotteur à travers la ligne III-III."Figure 1 is a side view of the float, "Figure 2 is a top view of the float," and Figure 3 is a section of the float across line III-III.
Une partie de ligne touée pour mesures sismiques est représentée à la figure 1. Elle comprend, d'un côté et de l'autre d'un déflecteur 1 immergé, une portion de ligne avant 2 accrochée à un navire situé à gauche et une portion de ligne arrière 3 à laquelle sont accrochés des capteurs situés à droite (hors de la figure) . De plus, une dérivation 4 de ligne relie les portions avant et arrière 2 et 3 en contournant le déflecteur 1, et sert à la transmission du signal des capteurs vers le navire. Le déflecteur 1 est maintenu à une profondeur sensiblement constante grâce à un flotteur 5, caractéristique de l'invention, l'empêchant de s'abîmer auquel il est suspendu par un câble ou une chaîne 18.A part of the line touched for seismic measurements is represented in FIG. 1. It comprises, on one side and the other of a submerged deflector 1, a portion of front line 2 attached to a vessel situated on the left and a portion rear line 3 to which are attached sensors located on the right (outside the figure). In addition, a line bypass 4 connects the front and rear portions 2 and 3 bypassing the deflector 1, and is used for the transmission of the signal from the sensors to the ship. The deflector 1 is maintained at a substantially constant depth thanks to a float 5, characteristic of the invention, preventing it from being damaged, to which it is suspended by a cable or a chain 18.
Le flotteur 5 comprend une portion horizontale et inférieure de corps flottant appelée ici fuseau 6 et une portion verticale supérieure de corps flottant appelée jambe 7. Le fuseau 6 présente : une portion avant 8 destinée à favoriser la pénétration dans l'eau et qui s'effile donc vers l'avant, jusqu'à un bout 9 arrondi ; une portion médiane 10 de section sensiblement uniforme ; et une portion arrière 11 s 'amenuisant vers l'arrière, une surface de fond 12 du fuseau 6 subissant à cet endroit un décrochement ascendant 13 pour fuir vers le haut et former une concavité de logement d'un aileron 14 vertical ; d'autres ailerons, horizontaux, 15 sont placés sur les côtés du fuseau 6. Les ailerons horizontaux 15 sont désavantageux en ce qu'ils augmentent l'encombrement transversal du flotteur 5, mais on pourra les rendre amovibles ou rétractiles pour les escamoter quand le flotteur 5 sera rangé à bord du navire. Il est avantageux que les sections droites du fuseau 6 soient sensiblement rectangulaires et que ses faces soient limitées par des arêtes 24 formant presque des angles vifs, comme l'illustre la figure 3. De préférence, le fond 12 est plat sur une grande partie de la longueur, notamment sous la partie médiane 10, et la surface supérieure du fuseau 6 forme un pont supérieur plat 16 à l'endroit de la partie médiane 10 et de la partie arrière 11.The float 5 comprises a horizontal and lower portion of the floating body called here spindle 6 and an upper vertical portion of the floating body called the leg 7. The spindle 6 has: a front portion 8 intended to promote penetration into the water and which is therefore tapers forward, to a rounded tip 9; a middle portion 10 of substantially uniform section; and a rear portion 11 tapering towards the rear, a bottom surface 12 of the spindle 6 undergoing at this point an ascending recess 13 to escape upwards and form a concavity for housing a vertical fin 14; other fins, horizontal, 15 are placed on the sides of the spindle 6. The horizontal fins 15 are disadvantageous in that they increase the transverse size of the float 5, but they can be made removable or retractable to retract them when the float 5 is stored on board the ship. It is advantageous that the straight sections of the spindle 6 are substantially rectangular and that its faces are limited by edges 24 forming almost sharp angles, as illustrated in FIG. 3. Preferably, the bottom 12 is flat over a large part of the length, in particular under the middle part 10, and the upper surface of the spindle 6 forms a flat upper bridge 16 at the location of the middle part 10 and the rear part 11.
La jambe 7 est avantageusement à l'arrière du fuseau 6 et s'étend sensiblement sur la moitié de sa longueur, sensiblement sur toute la partie arrière 11 et sur la moitié de la partie médiane 10. Un organe de suspension 17 du déflecteur 1 par la chaîne 18 est accroché au fond 12, et comprend une bride 19 fixée au fuseau 6, une bielle 20 reliée à la chaîne 18 et une articulation 25 d'axe transversal entre elles, qui permet donc à la bielle 20 d'osciller d'avant en arrière mais pas latéralement, si bien que le déflecteur 1 contribue à stabiliser le flotteur 5 contre les mouvements de roulis en restreignant sa rotation autour de l'axe longitudinal. Une chaîne de sûreté 26 pourrait encore unir le déflecteur 1 à la bride 19 et soutenir celui-là si l'organe de suspension 17 se rompait. La bielle 20 peut comprendre un absorbeur de chocs. La jambe 7 est, sensiblement, à demi immergée sous la surface E de l'eau et comprend une portion avant 21 arrondie en demi-cylindre pour favoriser la pénétration, et une portion arrière 22 formée de deux pans se rejoignant en une arête 23 située à l'arrière. La jambe 7 est lisse, avec des sections droites horizontales sensiblement identiques, afin de limiter les forces produites par les mouvements verticaux de la houle. Le principe mécanique recherché consiste plus généralement à rendre la fréquence propre de pilonnement (mouvement oscillatoire vertical) du flotteur 5 proche d'une valeur où les mouvements de la houle n'exercent qu'un effort minimal, ce qui atténue les efforts sur l'organe de suspension 17. Les dimensions du fuseau 6 et la section de la jambe 7 peuvent être choisies en conséquence, en fonction de résultats de simulations numériques ou d'essais en bassin. On a cependant observé qu'un résultat favorable était plus facilement atteint si le fond 12 et le pont 16 étaient plats et relativement proches l'un de l'autre, ce qui justifie la forme plus large que haute du fuseau 6. On cherche aussi à accroître les frottements produits par le mouvement vertical de l'eau pour amortir les oscillations du flotteur 5 ; les angles presque vifs aux arêtes 24 du fuseau 6, de même que les ailerons horizontaux 15, donnent ce résultat en favorisant des tourbillons.The leg 7 is advantageously at the rear of the spindle 6 and extends substantially over half of its length, substantially over the entire rear part 11 and over half of the middle part 10. A suspension member 17 of the deflector 1 by the chain 18 is attached to the bottom 12, and comprises a flange 19 fixed to the spindle 6, a connecting rod 20 connected to the chain 18 and an articulation 25 of transverse axis between them, which therefore allows the connecting rod 20 to oscillate from front to back but not laterally, so that the deflector 1 helps stabilize the float 5 against rolling movements by restricting its rotation around the longitudinal axis. A safety chain 26 could still unite the deflector 1 with the flange 19 and support the latter if the suspension member 17 broke. The connecting rod 20 may include a shock absorber. The leg 7 is, substantially, half submerged under the surface E of the water and comprises a front portion 21 rounded in a half-cylinder to promote penetration, and a rear portion 22 formed by two sides meeting at an edge 23 located in back. The leg 7 is smooth, with substantially identical horizontal cross sections, in order to limit the forces produced by the vertical movements of the swell. The mechanical principle sought more generally consists in making the natural frequency of heaving (vertical oscillatory movement) of the float 5 close to a value where the movements of the swell exert only a minimal effort, which attenuates the efforts on the suspension member 17. The dimensions of the spindle 6 and the cross section of the leg 7 can be chosen accordingly, as a function of the results of numerical simulations or of basin tests. However, it has been observed that a favorable result is more easily achieved if the bottom 12 and the bridge 16 are flat and relatively close to each other, which justifies the wider than tall shape of the spindle 6. increasing the friction produced by the vertical movement of the water to dampen the oscillations of the float 5; the almost sharp angles at the edges 24 of the spindle 6, as well as the horizontal fins 15, give this result by promoting vortices.
D'autres considérations concernent la stabilisation du mouvement d'avance du flotteur 5. Il est habituel de l'améliorer en pourvoyant les flotteurs d'appendices, qui peuvent cependant augmenter la force de traînée et les allonger vers l'arrière, de tels appendices sont inutiles ici, où la jambe 7 fait office de gouvernail, l'aileron vertical 14 ayant le même effet s'il est ajouté. La jambe 7 est au mieux disposée à l'arrière du fuseau 6, et la bride 19 aussi à l'avant qu'on le peut sans rompre l'équilibre du flotteur 5, devant la jambe 7 ou du moins la plus grande partie de celle-ci. Le centre de carène du flotteur 5 doit être avancé et son centre de gravité reculé. L'aplatissement du fuseau 6 et la réduction de sa surface latérale qui en résulte est aussi bénéfique en cela, puisque les perturbations latérales produites par l'eau seront réduites . D'une façon générale, on préfère ne pas placer de lest dans le flotteur 5, ce qui pourrait le rendre plus stable mais augmenterait sa masse et son déplacement . Other considerations relate to the stabilization of the advance movement of the float 5. It is usual to improve it by providing the floats appendages, which can however increase the drag force and lengthen them backwards, such appendages are useless here, where the leg 7 acts as a rudder, the vertical fin 14 having the same effect if it is added . The leg 7 is at best disposed at the rear of the spindle 6, and the flange 19 as far forward as possible without upsetting the balance of the float 5, in front of the leg 7 or at least most of it. The center of the hull of float 5 must be advanced and its center of gravity moved back. The flattening of the spindle 6 and the reduction of its lateral surface which results therefrom is also beneficial in this, since the lateral disturbances produced by the water will be reduced. In general, it is preferable not to place ballast in the float 5, which could make it more stable but would increase its mass and its displacement.

Claims

REVENDICATIONS
1. Flotteur (5) de ligne touée, comprenant une portion horizontale (6) de forme sensiblement fuselée, caractérisé en ce qu'il comprend une portion supérieure (7) s 'élevant vers le haut de la portion horizontale et en ce que la portion horizontale est immergée complètement, et la portion supérieure partiellement émergée, quand le flotteur soutient un élément (1) de la ligne. 1. Float (5) of touched line, comprising a horizontal portion (6) of substantially tapered shape, characterized in that it comprises an upper portion (7) rising upwards from the horizontal portion and in that the horizontal portion is completely submerged, and the upper portion partially emerged, when the float supports an element (1) of the line.
2. Flotteur selon la revendication 1, caractérisé en ce que la portion supérieure (7) s'élève à l'arrière de la portion horizontale (6) .2. Float according to claim 1, characterized in that the upper portion (7) rises at the rear of the horizontal portion (6).
3. Flotteur selon la revendication 2 , caractérisé en ce qu'un organe de suspension (19) d'une portion (1) de la ligne, situé sous la portion horizontale, est aussi situé en avant d'au moins la plus grande partie de la portion supérieure (7) .3. Float according to claim 2, characterized in that a suspension member (19) of a portion (1) of the line, located under the horizontal portion, is also located in front of at least the major part of the upper portion (7).
4. Flotteur selon la revendication 3, caractérisé en ce que l'organe de suspension (19) comprend une unique articulation (25), qui a un axe transversal .4. Float according to claim 3, characterized in that the suspension member (19) comprises a single articulation (25), which has a transverse axis.
5. Flotteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la portion horizontale (6) est plus large que haute. 5. Float according to any one of claims 1 to 4, characterized in that the horizontal portion (6) is wider than it is high.
6. Flotteur selon la revendication 5, caractérisé en ce que la portion horizontale a un fond (12) et un pont supérieur (16) partiellement plats.6. Float according to claim 5, characterized in that the horizontal portion has a bottom (12) and an upper bridge (16) partially flat.
7. Flotteur selon la revendication 6, caractérisé en ce que la portion horizontale a des sections droites sensiblement rectangulaires. 7. Float according to claim 6, characterized in that the horizontal portion has straight sections that are substantially rectangular.
8. Flotteur selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'il comprend un fond à décrochement ascendant (13) en arrière, des ailerons (14) verticaux étant logés dans le décrochement .8. Float according to any one of claims 5 to 7, characterized in that it comprises a bottom with ascending recess (13) behind, ailerons (14) vertical being housed in the recess.
9. Flotteur selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'il comprend des ailerons horizontaux (15) sur la partie horizontale (6) . 9. Float according to any one of claims 1 to 8, characterized in that it comprises horizontal fins (15) on the horizontal part (6).
10. Flotteur selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la portion supérieure (7) a des sections droites horizontales sensiblement uniformes. 10. Float according to any one of claims 1 to 9, characterized in that the upper portion (7) has substantially uniform horizontal cross sections.
EP00951673A 1999-07-16 2000-07-13 Towed line floater Expired - Lifetime EP1196319B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9909249A FR2796360B1 (en) 1999-07-16 1999-07-16 TOUEE LINE FLOAT
FR9909249 1999-07-16
PCT/FR2000/002030 WO2001005648A1 (en) 1999-07-16 2000-07-13 Towed line floater

Publications (2)

Publication Number Publication Date
EP1196319A1 true EP1196319A1 (en) 2002-04-17
EP1196319B1 EP1196319B1 (en) 2004-05-12

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Application Number Title Priority Date Filing Date
EP00951673A Expired - Lifetime EP1196319B1 (en) 1999-07-16 2000-07-13 Towed line floater

Country Status (8)

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US (1) US6755144B1 (en)
EP (1) EP1196319B1 (en)
AU (1) AU779891B2 (en)
CA (1) CA2379248A1 (en)
FR (1) FR2796360B1 (en)
GB (1) GB2369093B (en)
NO (1) NO20020199L (en)
WO (1) WO2001005648A1 (en)

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CA2379248A1 (en) 2001-01-25
AU779891B2 (en) 2005-02-17
NO20020199D0 (en) 2002-01-14
GB2369093A (en) 2002-05-22
US6755144B1 (en) 2004-06-29
WO2001005648A1 (en) 2001-01-25
GB0200570D0 (en) 2002-02-27
AU6453400A (en) 2001-02-05
GB2369093B (en) 2003-06-18
FR2796360A1 (en) 2001-01-19
FR2796360B1 (en) 2001-09-07
NO20020199L (en) 2002-03-15
EP1196319B1 (en) 2004-05-12

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