Capsizing experiments of purse seiners in following and quartering seas and anti-broaching steering system

Abstract

It is well established that a ship that is safe in beam seas may capsize in following and quartering seas. The capsizing depends on not only stability of ship itself but also operation practice. Therefore, capsizing model experiments were carried out to distinguish dangerous situations. The models of 135 GT, 80 GT and 39 GT purse seiners were used for these experiments. These models were capsized by broaching-to, pure loss of stability and bow diving.
Broaching-to which was one of the most dangerous situation for purse seiners, was greatly confirmed in those experiments. We developed anti-broaching steering system (ABSS) to prevent broaching-to. It was confirmed by the model experiments that ABSS is effective to prevent the broaching.