Airfoil shaped trawl door
AssigneeNy Toghlerahonnun Ehf.
InventorSmari Josafatsson
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Abstract
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 as well as at pelagic trawl fishing applications. The invention also relates to seismic surveillance line spreading and spreading of other items towed in water. The present application provides a novel trawl door design with improved stability and efficiency. The inventors are able to demonstrate smaller angles of attack using the trawl door of the present invention, which is as little as 7.5 degrees.
Claims19
A hollow trawl door, said hollow trawl door having one or more chambers and an airfoil cross-section, comprising:
- a first side panel having a curvature forming the back surface,
- a second side panel having a curvature forming the front surface, and
- an upper panel forming the top of the trawl door and a bottom panel forming the bottom of the trawl door,
- wherein the first side panel and second side panel are connected at a leading edge and at a trailing edge of the airfoil,
- wherein the trawl door comprises one or more openings to allow water to flow in and out of the trawl door;
- and
- wherein the radius of the second side panel is greater than 1 to about 5 times of the radius of the first side panel;
- further comprising a reinforcing pipe along the leading edge of the airfoil and a reinforcing bar along the trailing edge of the airfoil to increase the strength of the hollow trawl door.
Dependencies are inferred from the claim text.