ソコビキアミ ノ アミルイ ニカカル チョウリョク ニツイテノ コウサツ (ヨホウ)

To obtain some fundamental suggestion on the net design of trawl net, Author carried out the field experiment. Results obtained are summarized as follows: (1) On Danish seine net, the tension on the head rope was about 40% of the net resistance and that on the ground rope was about 60% of the net resistance． (2) While Trawl net was draging, the tension on the head rope was about 20% of the net resistance, the tension on the lacing line was about 20% of the net resistance and the tension on the ground rope was about 60% of the net resistance. And when the trawl net was draged, the tension on the head rope reduced, because of transmitting some of tension to the lacing line.底曳網の綱類へかかる張力を知るために海上実験を行ない次のような結果を得た。 (1) 1そう曳網においては浮子綱にかかる張力は全抵抗の約40%,沈子綱にかかる張力は全抵抗の約60%となる。 (2) トロール網においてはヘッドロープにかかる張力は全抵抗の約20%,筋縄へは約20%グランドロープへかかる張力は約60%となる。曳網状態ではヘッドロープにかかる張力は筋縄へ移行されへツドロープにかかる張力は減少している