Abstract
It is not practical to calculate the tension of a towing rope or the configuration of a gill net by the voluminous tables of function or by the electric computer, even if final results are correct. The author suggested in part I that the loop described by the towed rope or a plane net at constant velocity could be considered as the catenary curve. Its advantages were shown by comparing with the experimental values. When only the loop functions of the basic catenary σ', ξ', η' are given, the objective value can be obtained by formulas (16) and (18), however, the calculation process is rather complex for practical use. In this paper, the author simplified the calculation using the functions A, B and C (cf. Table 3) derived from σ', ξ' and η', and the order of the calculation was obtained from the examples.
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