This study evaluates the dynamic stability of an 85-meter single screw fisheries training vessel through empirical prediction, full scale sea trials, and model test analysis. The empirical formula indicated marginal instability. Full scale sea trial tests showed that the first overshoot angle in the 10°/10° zig-zag test exceeded the IMO criterion, a clear unstable loop appeared in the direct spiral test and a residual yaw rate persisted in the pull-out test, confirming dynamic instability. Model propeller wake test report results revealed that the axial velocity distribution was nearly symmetric between port and starboard semi-circles while the tangential component revealed opposite signs indicating a propeller-induced swirl structure. Although the tangential velocity magnitude was small, such asymmetric inflow may influence rudder inflow under marginally unstable conditions. The instability, therefore, is interpreted as a combined effect of hull form characteristics and propeller induced three dimensional flow structures.

서 론
재료 및 방법
    대상 선박 및 주요 제원
    침로 안정성 판별식
    경험식 기반 조종계수 도출
    해상 시험 방법
    모형 시험 기반 후류 및 슬립 스트림 분석
결과 및 고찰
    경험식 기반 침로 안정성 판별
    실선 시험 기반 침로 안정성 판별
    모형 시험 기반 후류 및 슬립 스트림 분석
결 론
사 사
References

• 이춘기(국립한국해양대학교 항해융합학부 교수) | Chun-Ki LEE (Professor, Div. of Navigation Convergence Studies, Korea Maritime and Ocean University, Busan 49112, Korea)
• 이민규(국립부경대학교 해양생산관리학부 수산물리학전공 대학원생) | Min-Gyu LEE (Graduate Student, Department of Marine Production Management major of Fisheries Physics, Pukyong National University, Busan 48547, Korea)
• 김수형(국립부경대학교 실습선 교수) | Su-Hyung KIM (Professor, Training ship, Pukyong National University, Busan 48547, Korea) Corresponding author