In the design and operation of a trawl net, main theoretical problem is mechanical one such as its configuration and tension. Many scientists have made a lot of hard research on this field. In this paper, the author has described a systematic way for solving the mechanical problem of trawl net, and on some given net, made some initial studies about the hydrodynamic properties of wire-warp and plane PE-web and the calculation of the configuration and tension of wire-warp.
Results obtained suggest that the hydrodynamic properties of warp and PE-web made from different materials and forms experimented in tank and their configuration, and tension calculated by solving equilibrium equations.
Up to now, the author has not finished the studies on the head rope, food rope and belly webbing of the trawl net. Research work in this respect should be continued.
