Effects of mouth shape of conical netting constructions on properties of their resistance

Results of tests performed on 18 conical netting constructions, each construction being; a simplified model of the netting part of a trawl, are presented. The constructions were mounted on elliptical frames the oblateness (bl /a1) of which being 0.25; 0.50; 0.75; and 1.00; additionally, 5 constructions mounted on square frames were tested. The results point out the resistance coefficient Cx in the ellipse-based constructions to be independent of the ellipse oblateness within the range of 0.25- h 1.00. Additionally, energy expenditure per mouth area unit of four-walled netting constructions hauled in water was shown to be minimal with a circular and square mouth and to increase, with elliptical mouth, in a reversed proportion to the ellipse oblateness, bl /a1.

Abstract licence: CC BY

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