The model ship of this study, the Baek-Kyung fisheries training ship of Pukyong National University, has a length between perpendiculars of 85 meters, making it not subject to the IMO maneuverability standards. However, understanding the maneuvering characteristics of the vessel is essential for safe navigation. In this regard, this study was conducted to analyze the results from the sea trials of the model ship conducted in accordance with the IMO maneuverability standards. The results of the turning tests met the standards well while in the zig-zag tests, the first overshoot angle exceeded the standard in the 10°/10° test; however, such results met with a difference of 1.8° in the 20°/20° test. Additionally, using the course-stability discrimination formula, the calculated value was -0.0051, indicating unstable course-stability. The results of the stopping tests met the standards well. It is hoped that the analyzed maneuvering characteristics of the model ship from the study results will contribute to the safety of ship navigation.

In order to offer specific information needed to assist in operation of a ship with same type rudder through evaluating the maneuverability of training ship A-Ra with flapped rudder, sea trials based full scale for turning test, zig-zag test with rudder angle 10° and 20°, and spiral test at service condition were carried out on starboard and port sides around Jeju Island according to the standards of maneuverability of IMO. As a result, the angular velocity of port turn was higher than that of starboard turn. Therefore, the size of turning circle was longer on the starboard side. In addition, variation of the transfer due to various factors was more stable than those of the others. In the Z-test results, the mean of 1st and 2nd overshoot angles were 9.8°, 6.3° and 15.3°, 9.2° respectively when the port and starboard was 10°; the 1st overshoot angle were 18°, 13.7° when using 20°. Her maneuverability index Tˊ and Kˊ can be easily determined by using a computer with the data obtained from Z-test where Kˊ and Tˊ are dimensionless constants representing turning ability and responsiveness to the helm, respectively. In the Z-test under flap rudder angle 10°, the obtained Kˊ value covered the range of 2.37-2.87 and Tˊ was 1.74-3.45. Under the flap rudder angle 20°, Kˊ and Tˊ value showed 1.43-1.63, 1.0-1.73, respectively. In the spiral test, the loop width was unstable at +0.3° and –0.5°-0.9° around the midship of flap rudder. As a result, course stability was comparatively good. From the sea trial results, training ship ARA met the present criterion in the standards of maneuverability of IMO.

인천항의 송도 신도시와 영종도 인천국제공항을 이어주는 제2연륙교 건설사업이 1999년 민간제안사업으로 정부에 제안되어 3차례에 걸쳐 실시된 선박의 통항 안전성에 관한 연구에도 불구하고 적정 교각폭이 결정되지 못하고 있다. 따라서 본 연구에서는 인천항의 장래 교통량의 측면과 최대선형의 선박 조종성 측면에서 소요 교각폭을 산정함을 목적으로 하고 있다. 연구결과, 제2연륙교 주경간 항로는 교통량 수용을 위하여 기본적으로 왕복항로 설계가 필요하며, 2020년 교통량 수용을 위한 소요 교각폭은 1,005m, 최대선형의 왕복통항을 위한 소요 교각폭은 990m로 산정되어 1,000m 교각폭이 장래 교통량 수용 및 최대선형의 안전한 왕복통항이 가능한 것으로 평가되었고, 700m 교각폭은 최대선형의 일방통항은 가능하나 최대선형과 일반 중·소형선박과의 왕복통항은 안전성이 확보되지 아니한 것으로 평가되었다.