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Abstract

Most fishing vessels are less than 100 meters in length, so IMO maneuverability standards do not apply. As a result, studies on the maneuverability of fishing vessels are considerably fewer compared to those on merchant ships. However, with technological advancements, the size of fishing vessels continues to grow, and as more fishermen are on board, accidents could lead to fatal casualties. In response, the authors determined that research on the maneuverability of fishing vessels is urgently needed. Thus, the authors conducted a maneuverability evaluation on a fisheries training vessel with the hull shape of a fishing trawler, 85 meters in length (LBP), and analyzed the results. The target vessel met the IMO criteria for tuning ability and stopping ability; however, it did not satisfy the criteria for course-keeping ability and yaw-checking ability as evaluated by the 10°/10° Z-test. Furthermore, the additional direct spiral test and pull-out test indicated that the vessel was dynamically unstable. However, during the research, it was found that the target vessel was greatly affected by the lateral pressure caused by the propeller's rotation. This suggests that the dynamic instability might not just come from the hull shape issue. In this context, the authors proposed that the ratio of the submerged hull area to the propeller area should be an important factor to consider when evaluating a vessel's dynamic stability.

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