WO2020084643A1 - Connexion pour une porte de chalut - Google Patents

Connexion pour une porte de chalut Download PDF

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Publication number
WO2020084643A1
WO2020084643A1 PCT/IS2019/050014 IS2019050014W WO2020084643A1 WO 2020084643 A1 WO2020084643 A1 WO 2020084643A1 IS 2019050014 W IS2019050014 W IS 2019050014W WO 2020084643 A1 WO2020084643 A1 WO 2020084643A1
Authority
WO
WIPO (PCT)
Prior art keywords
trawl door
trawl
trailing edge
door
gear
Prior art date
Application number
PCT/IS2019/050014
Other languages
English (en)
Inventor
Smari Josafatsson
Original Assignee
Ny Toghlerahonnun Ehf.
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 Ny Toghlerahonnun Ehf. filed Critical Ny Toghlerahonnun Ehf.
Priority to EP19813173.2A priority Critical patent/EP3869951A1/fr
Publication of WO2020084643A1 publication Critical patent/WO2020084643A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/04—Devices for spreading or positioning, e.g. control thereof
    • A01K73/045—Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards

Definitions

  • the present invention relates to trawl doors used in trawl fishing, including shallow water trawl fishing applications, deep water trawl fishing applications, bottom trawl fishing applications, pelagic trawl fishing applications as well as any other gear towed by a vessel through a body of water.
  • the invention also relates to a new connector for such trawl doors.
  • US 3,281,980 discloses a hollow trawl door with an upper and lower surface and a hollow compartment there between.
  • the trawl door has conventional connectors for the warp wire on the front surface and the connection to the fishing gear, such as the trawl, is on the back surface.
  • Such connection is referred to as back-strap ears and for trawl fishing, the bridles and sweepers connect the trawl door to the trawl by a connection to the back-strap ears.
  • traditional trawl doors such as doors disclosed in GB2,332,660, DK 2015 00026, WO 2006/011163 and US 2010/0115820, which all have connections to the trawl on the back surface.
  • WO 2017/046821 discloses a trawl door comprising a front surface and a back surface where the front surface further comprises one or more front-strap ears near the trailing edge.
  • the document further discloses a hollow trawl door with an airfoil cross-section comprising side panels having a curvature forming the back and front surface and being connected at a leading edge and at a trailing edge of the trawl door and where an upper panel and a bottom panel form the top and the bottom sides to form a hollow trawl door.
  • This trawl door design with improved stability and efficiency, when an optimal connection is applied for the trawl door based on conditions and type of fishing.
  • the present application provides a novel trawl door connection means with an improved efficiency and novel way of connecting the trawl doors to the trawl or any gear towed through a body of water, such as streamer cables for oil searching or sanitation devices.
  • trawl doors which work according to the Bernoulli principle are used for trawling, the trawl door operates or is towed under a greater angle of attack during the spreading of the trawl, but as soon as the trawl is spread and towing/fishing starts these trawl doors can be towed under a much smaller angle of attack which is more energy efficient.
  • the trawl doors of the present invention can be used under a larger angle of attack during casting and spreading of the trawl but a much smaller angle of attack during fishing, which is as little as 7.5 degrees.
  • Traditional doors nowadays do not operate with such a small angle of attack due to the shape of the doors. They are primarily forcing doors and consume a large amount of oil during towing.
  • Traditional trawl door connections facilitate a forced angle of fishing with much effort angle (about 20 - 40 degrees) with connections of the towing warp wire in the bracket and with connections from backstops to the trawl.
  • the present connector however allows the sweeps to extend behind the upper/back surface of the trawl door during casting, but as the trawl spreads the trawl door changes the angle of attack and the sweeps extend in the direction in front of the lower/front surface of the trawl door.
  • This is solved by placing the connector at the trailing edge of the trawl door and by shaping the trawl door such that the trailing edge has lateral space on each side of the connector to provide free angular movement of a connected sweep across a plane that includes the trailing edge of the trawl door and which lies between the front surface and back surface, between an angle outwardly from the outer surface and an angle inwardly of the back surface.
  • the connector of the present invention is therefore positioned at the trailing edge of the trawl door, either attached to the top and bottom plate for more square shaped trawl door or slightly inwardly at the trailing edge and preferably close to the top and the bottom sides of the trawl door for trawl door with a diagonal trailing edge.
  • the connector to the trawl is positioned at an attachment axis which is a non-physical line extending from the top to the bottom of the trawl door.
  • the position of the attachment axis lies between the leading edge and the trailing edge of the trawl door, where the attachment axis is closer to the trailing edge than the leading edge and is 1/3 to 1/5 of the distance from the trailing edge towards the leading edge.
  • a trawl door where the connecting means for the sweeps/bridles between the trawl door and the gear is positioned on the trailing edge of the trawl door with a free angular movement of a connected sweep which lies between the outer surface and inner surface between an angle outwardly from the outer surface and an angle inwardly of the inner surface and with a free angular movement of a connected sweep which lies between the top and the bottom of the trawl door.
  • Another preferred object of the present invention is to provide a hollow trawl door having one or more chambers and an airfoil cross-section.
  • a trawl door having an airfoil cross-section
  • the trawl door comprises a first side panel having a curvature forming the outer surface, a second side panel having a curvature forming the inner surface, an upper plate forming the top of the trawl door and a bottom plate forming the bottom of the trawl door.
  • the first side panel and the second side panel are connected at a leading edge and at a trailing edge of the airfoil.
  • the trawl door further comprises connector(s) for connection to the vessel and connectors for connection to the gear.
  • the connectors for the gear are positioned on the trailing edge of the trawl door where the trailing edge is formed to provide free angular movement of a connected sweep across a plane that includes the trailing edge of the trawl door and which lies between the outer surface and inner surface, between an angle outwardly from the outer surface and an angle inwardly of the inner surface.
  • the angle of attack for traditional trawl doors is much larger than of the trawl doors of the present invention having an airfoil transection shape.
  • the trawl door of the present invention works according to the Bernoulli principle and although trawl doors having an airfoil shape have been disclosed before, such trawl doors have not been in use.
  • the trawl door design disclosed herein provides a trawl door which finds its optimal angle of attack both during casting and fishing (operation) due to a new and inventive way of connecting the trawl door to the gear being pulled.
  • the angle of attack of the trawl door of the present invention is such that the direction of the sweepers to the trawl is from the outer surface.
  • the gear is extended further from the vessel the door's angle of attack changes and the direction of the sweepers to the gear is from the inner surface.
  • the present invention solves this issue by placing the connectors to the gear at or on the trailing edge of the trawl door or on the top and bottom surface of the trawl door along an attachment axis giving the best connection.
  • the trawl door and the connectors of the present invention are designed such that the connectors to the gear have a free change of direction from the outer to the inner side of the trawl door.
  • a trawl door having an airfoil cross-section
  • the trawl door comprises a first side panel having a curvature forming the outer surface, a second side panel having a curvature forming the inner surface, an upper plate forming the top of the trawl door and a bottom plate forming the bottom of the trawl door.
  • the first side panel and the second side panel are connected at a leading edge and at a trailing edge of the airfoil.
  • the trawl door further comprises connector(s) for connection to the vessel and connectors for connection to the gear.
  • the trailing edge of the trawl door is diagonal where the length between the leading edge and the trailing edge is decreasing from the centre towards the top and the bottom edges of the trawl door, and the connectors for the gear are positioned on the trailing edge of the trawl door at or near the top plate and the bottom plate.
  • a trawl door having an airfoil cross-section
  • the trawl door comprises a first side panel having a curvature forming the outer surface, a second side panel having a curvature forming the inner surface, an upper plate forming the top of the trawl door and a bottom plate forming the bottom of the trawl door.
  • the first side panel and the second side panel are connected at a leading edge and at a trailing edge of the airfoil.
  • the trawl door further comprises connector(s) for connection to the vessel and connectors for connection to the gear.
  • the trailing edge of the trawl door is shaped to form diagonal lines from the centre and towards the top plate and the bottom plate or with cut-outs towards the leading edge, and the connectors for the gear are positioned on the trailing edge of the trawl door where the diagonal lines or cut-outs are closest to the leading edge.
  • a trawl door having an airfoil cross-section
  • the trawl door comprises a first side panel having a curvature forming the outer surface, a second side panel having a curvature forming the inner surface, an upper plate forming the top of the trawl door and a bottom plate forming the bottom of the trawl door.
  • the first side panel and the second side panel are connected at a leading edge and at a trailing edge of the airfoil.
  • the trawl door further comprises connector(s) for connection to the vessel and connectors for connection to the gear.
  • the trailing edge of the trawl door is shaped to falls back to an attachment axis of the trawl door in at least two positions of the trailing edge, and the connectors for the gear are positioned on the trailing edge at or near where the trailing edge meets the attachment axis.
  • a trawl door having an airfoil cross-section
  • the trawl door comprises a first side panel having a curvature forming the outer surface, a second side panel having a curvature forming the inner surface, an upper plate forming the top of the trawl door and a bottom plate forming the bottom of the trawl door.
  • the first side panel and the second side panel are connected at a leading edge and at a trailing edge of the airfoil.
  • the trawl door further comprises connector(s) for connection to the vessel and connectors for connection to the gear.
  • the trailing edge of the trawl door is shaped to falls back towards the leading edge of the trawl door in at least two positions, and the connectors for the gear are positioned on the trailing edge at the closest distance from the leading edge.
  • the trailing edge of the trawl door is formed to have a decreasing length between the leading edge and the trailing edge from the centre or mid-way from the centre to the top and the bottom edges of the trawl door and towards the top and bottom of the trawl door.
  • the part of the trailing edge having a decreasing length between the leading edge and the trailing edge is a diagonal line or curved, either in a concave or convex manner.
  • an attachment axis of the trawl door defines a non-physical line extending from the top to the bottom of the trawl door and the position of the attachment axis between the leading edge and the trailing edge of the trawl is closer to the trailing edge than the leading edge and is positioned at around 1/3 to 1/5 of the distance from the trailing edge towards the leading edge depending of the size and shape of the trawl door.
  • the connectors for the gear are positioned on the trailing edge where the part of the trailing edge having a decreasing length meets the attachment axis.
  • the trailing edge is formed to provide free angular movement of a connected sweep which lies between the top and the bottom of the trawl door.
  • the trailing edge is has V-shaped our U-shaped cut-outs towards and intercepting the attachment axis, and wherein the connectors for the gear are positioned where the part of the trailing edge meets the attachment axis.
  • the trailing edge of the trawl door is diagonal where the length between the leading edge and the trailing edge is decreasing from the centre towards the top and the bottom edges of the trawl door.
  • the trailing edge of the trawl door further comprises gaps extending from the trailing edge to the attachment axis.
  • the upper and lower panel form a top and bottom plate extending beyond the periphery of the trawl door.
  • the trawl door has a V-shape, U-shape, dihedral, tip dihedral or polyhedral shape along the length of the door between the top and bottom portion of the trawl door.
  • the connector for the towing warp wire is a bracket at the front surface of the trawl door.
  • the trawl door further comprises a bracket stopper.
  • the trawl door further comprises one or more spoilers.
  • the radius of the second side panel which is about at least about 1 to about 5, preferably about 2 to about 3, times of the radius of the first side panel for a trawl door with an airfoil cross-section.
  • the connectors for the rope/wire between the trawl door and the trawl/gear comprises three portions; i) a first portion welded to the trawl door, ii) a second movable portion allowing movement around at least one or more axis; and iii) a third ear portion for providing connection to the rope/wire between the trawl door and the trawl.
  • the connectors for the rope/wire between the trawl door and the trawl/gear comprises a swivel.
  • the connectors for the rope/wire between the trawl door and the trawl/gear is an ear formed at the trailing edge in upper and lower panel of the trawl door.
  • the ratio of the chord line of the airfoil to the longitudinal length is preferably about 0.5 to about 3.
  • the trawl door is a hollow trawl door, wherein the trawl door comprises one or more openings to allow water to flow in and out of the trawl door.
  • the back surface further comprises one or more back-strap ears near the trailing edge.
  • the trawl door further comprises one or more trawl door shoes.
  • the trawl door further comprises a location sensor, a monitor sensor or a trawl door monitor sensor and sensor holder, which identifies the location of the trawl door.
  • the length of the chord line is substantially the same as the radius of the first side panel.
  • the attachment axis positioned near the trailing edge between the leading edge and the trailing edge of the trawl door. In specific embodiments the attachment axis positioned near the trailing edge at approximately 1/3 to 1/5 of the distance between the trailing edge to the leading edge.
  • the gear towed by a vessel and controlled by the "trawl" doors of the present invention is selected from, but not limited to, fishing gear, such as trawls, scientific gear such as cables for searching for oil below the bottom of the ocean, sanitation devices for example for rinsing the surface of a lake or ocean or collecting floating items like plastic waste.
  • the trawl door further comprises a location sensor, trawl door sensor, monitoring sensor or trawl door monitoring sensor, such as for example a Scanmar or Simrad signal holders.
  • the location sensor may be placed inside the trawl door chambers so they are better protected and will not affect the fishing ability of the trawl doors.
  • the connector of the present invention has three functional parts, where the first part is attached to the trawl door by any means of connection such as welding.
  • the second functional part of the connector is a movable or rotatable part, which is able to move or rotate around one or more axis.
  • the third functional part is then the part which connects to the back-straps, bridles or sweeps, such as an ear.
  • water relates to clear water or sea water (the ocean) as most trawling takes place in the ocean/sea
  • the term termeer surface refers to the upper side of an airfoil or the side of the trawl door which is heading away from the trawl during towing formed by the first side panel. This is further outlined in Figs 1-2.
  • the term “unitary surface" refers to the lower panel of an airfoil or the side of the trawl door which is facing the path of the vessel and the inner surface of the opposing trawl door formed by the second side panel. This is further outlined in Figs 1-2.
  • the term “acceptorupper side of the trawl door” refers to the short side of the trawl door pointing or directed up during towing.
  • the upper side may be a plate connecting the first and the second side panels or it may be a plate extending beyond the periphery of the top plate of the hollow trawl door. This is outlined in Figs. 3-4.
  • the term termed herein refers to the short side of the trawl door pointing or directed down during towing.
  • the lower side may be a plate connecting the first and the second side panels or it may be a plate extending beyond the periphery of the bottom plate of the hollow trawl door. This is outlined in Figs. 3-4.
  • the term “architectureconnector(s) for connection to the vessel” refers to a structure attached to the trawl door for connection from the trawl door to the vessel, for example a fishing boat or research boat.
  • This connector is sometimes referred to as a bracket and the connection between the vessel and the trawl door is referred to as the warp, the warp wire or towing warp wire.
  • connectors for connection to the gear refers to a structure attached to the trawl door for connection from the trawl door to the gear being towed by the vessel. This connection is sometimes referred to as strap-ears, and when a fishing gear is attached to the trawl door, the connection between the trawl door and the fishing gear is referred to as straps, back straps, bridles or sweepers.
  • attachment axis refers to a non-physical line extending from the top to the bottom of the trawl door, where the position of the attachment axis between the leading edge and the trailing edge of the trawl door. The attachment axis is closer to the trailing edge than the leading edge and is positioned at around 1/3 to 1/5 of the distance from the trailing edge towards the leading edge depending of the size and shape of the trawl door.
  • gear refers any gear towed by a vessel and controlled by trawl doors.
  • the term may refer to items such as, but not limited to, fishing gear, such as trawls, scientific gear such as cables for searching for oil below the bottom of the ocean, sanitation devices for example for rinsing the surface of a lake or ocean or collecting floating items like plastic waste.
  • the doors of the invention may be used for towing other gear than trawls, such as fishing gear, such as trawls, scientific gear such as cables for searching for oil below the bottom of the ocean, sanitation devices for example for rinsing the surface of a lake or ocean or collecting floating items like plastic waste.
  • fishing gear such as trawls
  • scientific gear such as cables for searching for oil below the bottom of the ocean
  • sanitation devices for example for rinsing the surface of a lake or ocean or collecting floating items like plastic waste.
  • Fig. 1 illustrates an airfoil.
  • Fig. 2 shows the cross section of a preferred embodiment of the trawl door.
  • Fig. 3 is a schematic drawing of hollow trawl door.
  • Fig. 4 shows different constructions of the trawl doors of the present invention.
  • Fig. 5 shows different shapes of trawl doors and the position of connectors for such doors.
  • Fig. 6 shows a trawl door with a connector according to one embodiment of the invention.
  • Fig. 7 shows the position of the components of a trawl and present invention trawl door during casting (A), spreading (B) and fishing (C).
  • Fig. 8 shows the orientation of the present invention trawl door and the sweeper during casting (A), spreading (B) and fishing (C).
  • Fig. 9 shows a trawl door connected according to the present invention during spreading of a trawl.
  • Fig. 10 shows the orientation of the trawl door and the sweeper for different trawl doors and connection. Description of various embodiments
  • the trawl door of the present invention is a trawl door having an airfoil cross section. Therefore figure 1 outlines the classical terminology for the airfoil shape.
  • the airfoil shape has an upper surface and a lower surface joined at a leading edge having a maximum curvature and a relatively sharp trailing edge with a minimum curvature.
  • the chord line is the straight line connecting leading and trailing edges.
  • the chamber line is the locus of points midway between the upper and lower surfaces.
  • the upper surface is referred to as the back surface and the lower surface is referred to as the front surface.
  • the trawl doors of the present invention have an airfoil shape.
  • the radius of the first side panel (the outer surface) is greater (higher number) than that of the second panel (inner surface). In operation, such shape allows the water to push the door to spread out constantly and efficiently.
  • figure 2 shows a transection drawing of a trawl door with an example of dimensions and ratios.
  • the upper drawing shows the front pipe and the aft pipe which are reinforcing structures which connect the upper and the lower panel.
  • FIG. 3 is a schematic drawing of hollow trawl door according to some embodiments of the present invention having a V-shape.
  • Fig. 3A shows a trawl door where the inner side of the upper part is shown as closed, but in the lower part the panel has been removed to show inside the trawl door to show the inside of a hollow trawl door.
  • the inside of the first panel 1 forming the back surface of the trawl door is shown in the lower part of the drawing as well as the second panel 2 forming the front surface of the trawl door.
  • the top panel 3 forming the top of the trawl door and a bottom panel 4 forming the bottom of the trawl door are also shown in the drawing.
  • the figure shows the leading edge 5 and the trailing edge 6 to give an orientation of the terminology used herein.
  • Figure 3B shows the same trawl door where the inner side is closed.
  • the trawl door according to the present inventions may have V-shape, U-shape, dihedral, tip dihedral or polyhedral shape.
  • the trawl door can be divided into sections for straight, V-shaped and U-shaped doors as shown in Fig. 4.
  • Figure 5 shows different shapes of trawl doors, where the difference lies in the shape or form of the trailing edge.
  • the drawing also shows the position of the connectors to the gear with respect to the shape, the connectors to the gear all being on the attachment axis 9.
  • the drawing shows the attachment axis 9 across square trawl doors, trawl doors with diagonal trailing edges and trawl doors with triangular gaps in the trailing edge.
  • the drawing further shows the position of the connector to the gear 8 in all these embodiments. This drawing further outlines how the shape, or the line of the trailing edge intercepts the attachment axis in Figs.
  • 5B, 5C, 5D, 5E and 5F providing a free angular movement of a connected sweep across a plane that includes the trailing edge of the trawl door and which lies between the outer surface and inner surface, between an angle outwardly from the outer surface and an angle inwardly of the inner surface.
  • Figure 6 shows a trawl door according to the present invention with a diagonal trailing edge with a shorter distance between the leading and trailing edge at the top and bottom sides of the trawl door.
  • the trawl door shown in this embodiment has two spoilers on the leading edge.
  • the connector is shown at the trailing edge 6 at the top and the bottom of the trawl door in Fig. 6A.
  • Figure 6B is an enlargement of the top part of the trawl door in Fig. 8A showing the connector 15 and two spoilers 16.
  • Figure 6C is a further enlargement of the connector and its individual components.
  • the connectors for the sweeps between the trawl door and the trawl comprises three portions, namely a first portion 17 welded to the trawl door, a second movable portion 18 allowing movement around at least one or more axis, and a third ear portion 19 for providing connection to the rope/wire between the trawl door and the trawl.
  • the figure also shows how the connector provides movement around two (X,Y) axis.
  • the trawl door according to the present inventions can further comprises one or more spoilers 18. Use of spoilers are advantageous depending on the fishing methods and needs.
  • Figure 7 shows a trawl being casted from a ship and the components of the trawl during casting (A), spreading (B) and fishing (C).
  • the figure shows how the ship 17 is connected to the trawl doors 18 by warp wires 19 and the trawl 20 is connected to the trawl doors by sweeps/bridles 21.
  • the figure further shows how the trawl door spreads towards the sides and how the sweeps extend over the outer surface during casting but as the angle of attack changes, when the trawl starts to fish, the sweeps extend along the inner surface.
  • Figure 8 is an enlargement of Fig 7 showing the trawl doors 18 and the angle of attack during casting (A), spreading (B) and fishing (C).
  • the figure shows the orientation of trawl door relative to the direction and orientation of the warp wire 19 and sweeps/bridles 21.
  • the connector 8 to the gear is attached to the top and bottom plate of the trawl door near the trailing edge of the trawl door.
  • the warp wire 19 is connected to the connector to the vessel 17 the front side panel on the inner surface of the trawl door and the sweep/bridle 21 is connected to the novel connector 8 of the invention.
  • Figure 9 is a perspective drawing of a trawl door as the trawl (not shown) spreads.
  • the connector is positioned at the trailing edge and only the connector at the top plate is shown.
  • the connector is similar as shown in Fig. 6 and the figure shows how the angle of attack changes as the trawl spreads (indicated by the arrow).
  • Figure 10 shows the difference between the connections from the trawl door to the trawl of two prior art trawl doors and the trawl door of the present invention.
  • Fig. 10A shows a traditional trawl door 22, as is disclosed in US 3,281,980, with a conventional back-strap connector 23 to the trawl on the outer surface of the door.
  • the sweeps 21 are connected to the back-strap connector 23 and as the angle changes during casting the sweeps bend over the trawl door.
  • This kind of a trawl door also operates under a much larger angle of attack than the present trawl door.
  • Fig. 10B the trawl door of WO 2017/046821 is shown. This is a hollow trawl door with an airfoil cross section, where the connector 24 to the trawl is on the inner surface of the door.
  • the connector has an ear to connect to the sweeps and when the trawl door is in alignment i) the sweeps bend under the trailing edge of the door during casting (Fig. 10B), but work better in fishing mode with alignment ii) in Fig. 10C.
  • Fig. 10D the trawl door of the present invention is shown with a connector 8 at the trailing edge of the door. This would be the case for trawl doors with a diagonal trailing edge with a shorter distance between the leading and trailing edge at the top and bottom sides of the trawl door.
  • the connector allows the sweep to move around the axis from the outer surface to the inner surface (and from side to side, which is not shown in this drawing), the sweeps extend directly to the trawl and do not bend around the aft end of the trawl door during the entire operation.
  • Fig. 10E also shows the trawl door of the present invention where the connector 15 is on the top and bottom plate near the trailing edge of the door. This would be the case for trawl doors have an almost square first and second side panels (not a diagonal trailing edge). As the connector allows the sweep to move around the axis from the outer surface to the inner surface, the sweeps extend directly to the trawl and do not bend around the aft end of the trawl door during the entire operation. With connections as shown in Fig 10E and in Figs.
  • the present invention also covers the exact terms, features, values and ranges etc. in case these terms, features, values and ranges etc. are used in conjunction with terms such as about, around, generally, substantially, essentially, at least etc. (i.e., "about 3" shall also cover exactly 3 or “substantially constant” shall also cover exactly constant).

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Abstract

La présente invention concerne des portes de chalut utilisées dans la pêche au chalut, notamment des applications de pêche au chalut en eaux peu profondes, des applications de pêche au chalut en eaux profondes, des applications de pêche au chalut de fond, des applications de pêche au chalut pélagique, et d'autres engins divers. L'invention concerne également un connecteur pour une porte de chalut présentant une stabilité et une efficacité améliorées. Les portes de chalut de la présente invention peuvent être utilisées selon un angle d'attaque plus important pendant la coulée et l'étalement du chalut/des engins, mais un angle d'attaque beaucoup plus faible pendant la pêche (remorquage).
PCT/IS2019/050014 2018-10-26 2019-10-28 Connexion pour une porte de chalut WO2020084643A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19813173.2A EP3869951A1 (fr) 2018-10-26 2019-10-28 Connexion pour une porte de chalut

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Application Number Priority Date Filing Date Title
IS50244 2018-10-26
ISIS050244 2018-10-26

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WO2020084643A1 true WO2020084643A1 (fr) 2020-04-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20210685A1 (no) * 2021-05-31 2022-12-01 Stoe Tech As Kite for trål og anvendelse av Kite for trål

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FR636607A (fr) * 1928-04-13
US3079720A (en) * 1959-01-22 1963-03-05 Suberkrub Franz Otter boards for trawl nets
US3281980A (en) 1962-08-24 1966-11-01 Frank J Luketa Progressively flooding trawl doors
GB2332660A (en) 1997-12-23 1999-06-30 Schlumberger Holdings Deflector device
WO2006011163A2 (fr) 2004-07-26 2006-02-02 Candis Ehf. Panneau de chalut moule, leger, a efficacite hydrodynamique amelioree de grande vitesse et procedes d'utilisation et de fabrication
US20100115820A1 (en) 2007-04-24 2010-05-13 Valentine Gavrilovich Perevoshchikov Perforated slat trawl door
DK201500026U1 (da) 2015-02-19 2015-02-27 Thyborøn Skibssmedie As Trawlskovl
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