Studies on the Purse Seine-II
Effect of the Mesh and the Specific Gravity of Webbing
1971 Volume 37 Issue 1 Pages 8-12
Details
1971 Volume 37 Issue 1 Pages 8-12
The influence resulting from the ratio of the diameter of the twine to the length of bar (D/L) and the specific gravity of webbing (ρ) on the characteristics of the purse seine was investigated.
The results obtained are summarized as follows:
1) The webbing of a net which has a small D/L ratio sunk faster than that which has a large D/L ratio. It was found that the sinking speed of bottom margin was approximately proportional to 1/√D/L, while ρ exerts little effect on the sinking speed.
2) The netting form during the course of pursing depends chiefly upon the D/L ratio of webbing, and it was observed that nets with small D/L ratio rarely form a “cup-like” shape.
3) Tension in the purseline is proportional to the D/L ratio and ρ.
