When operating at high speed on a vessel, a high-speed planing hull occurs nonlinear movements such as stern trim and large sprays. This phenomenon results in the hindrance of stability, embarkation and mission performance. Excessive stern trim during the slides decreases propulsion efficiency and visibility of helmsman due to porpoising and changing the attack angle of the fluid flowing into the propeller. To improve these problems, an outboard floating plate is installed on the cavitation plate to greatly suppress or eliminate the porpoising phenomenon. In this study, to analyze the performance of the floating plate mounted on the outboard engine, numerical analysis was carried out to investigate the resistance applied to the floating plate and the lift generated according to the change of the angle of attack and the flow velocity. The reliability of the floating plate mounted on the outboard engine was verified by applying the floating plate according to the speed and the angle of attack.

최근 수십년간 크고 작은 대형 해난사고가 발생하였으며 2002년 6월 29일 제2연평해전에서 우리 해군 함정 참수리 357함이 이북 함정의 포탄에 피격되어 7시간 30분만에 침몰하였고 2007년 12월 7일 새벽 07시 태안 만리포 앞 해상에 정박 중이던 대형 유조선 허베이 스피리트호와 삼성중공업 타워 크레인과 충돌로 원유 12,547 톤이 유출하는 등의 크고 작은 사고가 빈번하게 발생되었다.