Abstract

comprisingcomprising during a trawling phase (220) alternating between control intervals (230) and adjustment intervals (250), such that during said control intervals (230) said control system performs position control to maintain at least a predefined target vertical position (30) of the trawl door (10) while during adjustment intervals (250) the vertical position of the trawl door (10) may be adjusted manually and said target vertical position (30) of said control algorithm (105) may be updated to a revised target vertical position (30). A benefit of the present method is that it is possible to use a pre-programmed control algorithm (105) to steer the trawl doors after deployment, thereby eliminating the need for expensive communication equipment, while simultaneously allowing an operator on a towing vessel (1) or even remotely from said towing vessel (1) to intermittently adjust a parameter of the trawling, i.e., the target vertical position.

IPC Classes  ?

• A01K 73/02 - Trawling nets
• A01K 73/04 - Devices for spreading or positioning, e.g. control thereof

Goods & Services

Trawl doors; Robotic trawl doors; Trawl winches; Actuators for mechanisms; Hydraulic actuators; Actuating mechanisms for controlling trawl door flaps; Drive units, other than for land vehicles; Drive mechanisms; electric and hydraulic winches; Lifting tackle [machines]; Lifting apparatus; Yarn winding machines; Robotic mechanisms for lifting; Robotic mechanisms for transportation; Industrial robots; Transmissions for machines; Variable speed transmissions [other than for land vehicles]. Software, including software for control of trawl doors and for integrating equipment for trawl doors; applications for mobile devices, including applications for mobile devices for control of trawl doors; Global Positioning System [GPS] apparatus, including GPS apparatus for control and positioning of trawl doors. Fishing nets, Trawls and Seines.

Abstract

The invention relates to a trawl door used for trawl fishing, and more particularly, a trawl door adapted for stable and efficient operation. The door is equipped with moveable plate members (44) mounted on an outer panel (18) of the trawl door, hereby controlling an opening (42) in the outer panel and as a result controlling the lift of the trawl door.

IPC Classes  ?

• A01K 73/045 - Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards

Abstract

The invention relates to a trawl door used for trawl fishing, and more particularly, a trawl door adapted for stable and efficient operation. The door is equipped with moveable plate members (44) mounted on an outer panel (18) of the trawl door, hereby controlling an opening (42) in the outer panel and as a result controlling the lift of the trawl door.

IPC Classes  ?

• A01K 73/045 - Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards

Abstract

There is provided a trawl door used for trawl fishing, and more particularly, a trawl door adapted for stable and efficient operation. The door is equipped with pulling points in one or more of the middle frames so as to produce angles of attack relative to a vessel pulling the trawl door of between 10 and 20 degrees.

IPC Classes  ?

• A01K 73/045 - Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards
• B63B 21/66 - Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables

Abstract

A spreading device, such as a trawl door (1), comprising frames (2, 3) defining a top and a bottom edge of the door (1) and a middle frame (4) positioned between the frames (2, 3) thereby establishing an upper and lower section; lower proximal and distal panels (5, 6) are provided in the lower section as well upper proximal and distal panels (7, 8) are provided in the upper section. The panels (5, 6, 7, 8) being of aerofoil construction. Lower flaps are (9) mounted under or on the distal panels (6, 8) and upper flaps (9') are mounted on the proximal or mesial panel (5, 7, 10, 11). The flaps (9, 9') are connected to driving units and adapted to be controlled remotely. The lower and upper distal panels (6, 8) have a distal surface (6', 8') rendering them hollow, wherein the lower flaps (9) constitute a part of the distal surface.

IPC Classes  ?

• A01K 73/045 - Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards
• B63B 21/66 - Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
• G01V 1/38 - SeismologySeismic or acoustic prospecting or detecting specially adapted for water-covered areas

Abstract

There is provided a spreading device, such as a trawl door (1) used for trawl fishing, and more particularly, a trawl door (1) adapted for stable and efficient operation. The door (1) is equipped with flaps (9) mounted below distal panels (6, 8) and connected to driving units, and the flaps (9) are adapted to be controlled remotely, when the spreading device is being towed through the water; the lower distal panel (6) and the upper distal panel (8) have distal surfaces (6', 8') rendering them hollow, wherein the flaps (9) constitute a part of the distal surface.

IPC Classes  ?

• A01K 73/045 - Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards