Abstract
Salmon drift net boats have been constructed since 1954 and type 96-GT was introduced in 1963. This type of fishing boat is used for tuna long line, saury stick-held dip net, squid pole and line or one boat medium trawl fishing. The ship hull form have changed from year as a function of navigation and practical fishing use. In addition, fishing boats have large individual differences such as draft and trim. The authors attained to the relationship between ship hull forms and motion dynamics, and to classify salmon drift net boats relative to their hull forms and their conditions. The authors used the Ordinary Strip Method (OSM) to compute theoretical ship motions and validated OSM in towing tank experiments with a fishing boat model. In this paper, the authors discuss ship hull forms and their conditions of the 96-GT type as a result of the calculations of the longitudinal ship motions of heaving, pitching and up-downward acceleration.
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