Patent ID: 6357164
Filing Date: 2002-03-19
Classification: A01K,D04C,D07B

Abstract:
A trawl which during field operations in a water entrained environment becomes disposed about a central axis, the trawl comprising:a plurality of mesh cells, each mesh cell including at least three mesh bars, during field operations of the trawl in a water entrained environment at least a portion of at least one of said mesh bars of at least one of the mesh cells generating hydrodynamic lift that aids in bettering a performance characteristic of a trawl system, the portion of mesh bars which generate hydrodynamic lift being.: a. offset from the central axis of the trawl; b. formed by a strap assembled by laminating together a plurality of rectangularly shaped straps and having a parallelogram cross-sectional shape so that movement of such mesh bars through the water entrained environment relative to a water flow vector creates a pressure differential across the portion of mesh bars which generate hydrodynamic lift thereby establishing a lift vector relative to the central axis of the trawl, the water flow vector being neither parallel nor perpendicular to the mesh bar; and c. each of the mesh bars that generate hydrodynamic lift intersecting with at least one other mesh bar; whereby the lift vector created by movement of the mesh bars which have a portion that generates hydrodynamic lift through the water entrained environment during field operations betters the performance characteristic of the trawl which is selected from a group consisting of increased trawl volume, improved trawl shape, reduced vibration, reduced noise, and reduced drag.