Publication Detail

A Comparison of the Hydrodynamic Resistance of Nylon and Spectra Trawls

Clifford Goudey
15 pp.
MITSG 92-18

The recent introduction of high-strength, high-modulus fibers in netting twines has caused increased interest in the resistance effects of their adoption. This report describes research on the resistance effects of using ultra-high-molecular-weight (UHMW) polyethylene netting instead of nylon netting of similar mechanical performance. The resistance implications of netting size in trawl nets has been the subject of numerous studies and reports. Tests aimed at quantifying the effects of varying twine diameter and mesh size typically fall into one of three categories: laboratory scale-model tests, laboratory netting- panel tests, and full-scale sea trials. From these sources of empirical data, researchers have developed formulas to relate the drag of netting based on its specifications and its orientation and location in the trawl net. Unfortunately these test methods each pose limitations on the reliability of the results. In order for a net designer or fisherman to take full advantage of the drag reduction associated with smaller twine diameters, that reduction needs to be accurately quantified. The experiments described were conducted for that purpose.

type: Technical reports

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Parent Project

Project No.: 1992-A-12
Title: MIT Sea Grant Advisory Services

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