巾着網の研究-III
沈降力の効果
1971 年 37 巻 9 号 p. 861-865
詳細
1971 年 37 巻 9 号 p. 861-865
This paper deals with the effect of sinkers on the performance of a purse seine in operation. The items considered are the sinking speed of leadline and the netting form in water. The experiments were conducted by the models.
The results are summarized as follows:
1. The sinking speed of the bottom margin of the purse seine is proportional to the square root of the weight of sinkers. However, the resistance of leadline acts a little.
2. Tension in the purse line is proportional to the weight of the sinkers.
3. The weight of the sinkers exert an influence upon net configuration; large weight of sinkers makes its working depth much more large and lessens the concavity of the scooping net wall during pursing.
