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SPECIFIC FEATURES OF TRAWL DESIGN
THEORETICAL BASIS OF DESIGN
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accuracy actual analytical angle of attack approximate aspect ratio auto-modeling axis basis bottom trawl cable calculated catch catch-capability catenary cell cell-pitch components conducted const corresponding curve depends design trawling determined deviation drag coefficient Cx drag forces dynamograph equal equation equipment experimental trawl experiments fishing gear fishing vessel flow full-scale gear geometric similarity ground-rope horizontal hydrodynamic coefficients hydrodynamic force hydrodynamic lift hydrodynamic quality instrument length lift coefficient lift devices lifting force linear dimensions maximum method model tests motion necessary netting linen nondimensional obtained pickups possible quantity relationship relative requirements Reynolds number rigging rope screw seabed selected similarity scale factors spherical floats Taking into account technical characteristics technical specifications thread tion towing trawl board trawl design trawl development trawl model trawl mouth trawl netting trawl system trawl travel trawl under design trawler trawling operations trawling speed trawling velocity trials twine diameter types of fish upper section vertical trawl wire