Abstract
The drag of a series of nylon codends of one twine thickness (2.71 mm) was measured by towing them from 2.5-m-diameter rings in isolation from a net. Mesh size was varied over the range from 44 to 128 mm, mouth circumference from 1.8 to 6.3 m, length of codend from 150 to 600 meshes, number of meshes round the circumference from 65 to 485 and speed from 1 to 5 knots. From these data, an empirical formula for codend drag was developed in terms of these parameters. The most significant factors were found to be towing speed, mouth circumference and number of meshes round the circumference. The effect of length in meshes was less significant and may be more complex. Mesh size was not found to be a significant factor. The hydrodynamic effects contributing to codend drag are discussed.
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