Abstract
This paper, described on the maneuverabilities of M.S. Cheju 402, the stern trawler (159 G.T.), training ship of Cheju National University which carried out the turning circle tests at helm angle 35$^{\circ}$ and 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Ztests of her. The results obtained were as follows; 1. The advances of the starboard and port turning circles were 79.1m, about 2.6 times of the length of the ship, and 81.4m, about 2.7 times of it, respectively. 2. The rates of speed reduction were about 0.49 together, and mean values of turning angular velocity of her at helm angle 35$^{\circ}$ into the starboard and port sides were 4.3$^{\circ}$/sec and 4$^{\circ}$/sec during the turning movement. 3. Overshoot angles of starboard side werelarger than those of port side at all Z tests, and mean values of them of the starboard and port sides at 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z tests were 110.5$^{\circ}$ 20.5$^{\circ}$, 28.5$^{\circ}$ respectively. 4. The maneuvering indices K and T of experimental ship at 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$, Z tests were 0.755 and 3.468, 0.566, and 1.621, and 0.481 and 1.547 respectively. Consequently, the experimental ship showed that her turning ability was more in effective as the helm angle was becomed larger and her obeying ability was more effective as it was becomed larger.
실험선 제주 402호의 조종성능을 전속전진중 최대타각으로 전타한 때의 선회권측정과 $10^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z시험에서 산출된 조종성지수를 분석, 검토한 결과를 요약하면 다음과 같다. 1. 선회종거는 우현선회시가 79.1m로 배의 길이의 약 2.6배였으며, 좌현선회시는 81.4m로서 배의 길이의 약 2.7배였다. 또, 선회경은 배의 길이의 약 2.6배로서 우현선회시가 78.3m로서 좌현선회시 80.4m보다 작았다. 2. 선회권시험시 속력저감율은 0.49였으며, 평균선회각속도는 우현선회시가 4.3$^{\circ}$/sec, 좌현선회시는 4$^{\circ}$/sec이었다. 3. Z시험 결과 over shot angle은 우현전타시가 좌현전타시보다 더 컸으며, 좌우타전타시의 평균값은 $10^{\circ}$Z시험시가 10.5$^{\circ}$, 20$^{\circ}$Z시험시가 20.5$^{\circ}$, 30$^{\circ}$Z시험시가 29.5$^{\circ}$로 다소 큰 편이었다. 4. $10^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z시험에서 K' 및 T'의 값은 각각 0.755, 0.566, 0.481 및 3.468, 1.621, 1.547로서 대체적으로 선회성은 대각도 전타 일수록 나쁘거나, 추종성은 대각도 전타 일 수 록 좋았다.
(Cheju National University)