Comparisons of the Equations to Estimate the Weight in Air of Nylon Netting

Abstract

We compared the results obtained in our previous studies (one strip of netting and a single mesh) with the results of other authors on the same subjects. We dealt with English knot nylon netting. The comparisons were made with the work of litaka for one strip of netting and with the works of Tauchi, Miyoshi and Iitaka for a single mesh. For the weight of one strip of netting (100 fathoms long and 100 meshes deep), our results fitted very well with the Netting Weight Table values, but Iitaka's equation yielded values generally higher. For the weight of a single mesh (ω: two legs and one knot) ω=(π/2)D² •L •{A+B(D/L)} •ρ, the constants A and B were obtained 1, 4 in Tauchi, 1, 6 in Miyoshi, 0.65, 6.5 in Iitaka, and 0.50, 4.5 in the authors respectively, where D is the diameter of twine, L is the length of one leg, and ρ is the density of twine. The assump-tions for leg and knot length are included in both the works of Tauchi and Miyoshi. litaka's equation was derived from the weight of netting in water. Our results were obtained from the measurements of netting based on the theoretical relationships of the weight in air.