Kho King Koh. This paper proposes a numerical model for analyzing the course stability of a towed ship in uniform and constant wind. The effects of an unstable towed ship and a stable towed ship Linear theory asumes a steady metacentric height but when a ship is moving through waves this height is a dynamic quantity not a static one. As the wave surface moves along the length of the ship the shape of the underwater form changes, particularly at the bow and stern, an effect accentuated by heave and pitching motions. As ships navigate in waves, they are exposed to dynamic loads, making it crucial to investigate the dynamic stability behaviour of ship structures. In this research, the dynamic stability of plates was investigated theoretically, and the influences of boundary conditions and damping were discussed. •A combination of enhanced course keeping and turning ability allows an optimal level of dynamic stability in the following sea. This is preferable because the modifications of the stern appendages configurations, aimed to improve the ship manoeuvrability, are often limited by other design constraints. For added stability, two of these ships had a pontoon attached at their sides opposite the lift. Two numerical time-domain methods assessed the transient dynamic heel after a sudden loss of crane The area of dynamic stability of ship motions in waves is multifaceted and rather loosely defined in naval architecture; but the essential aspect is that in the open sea some ships tend to perform dangerously large motions which from time to time result in the tragic event of a capsize1. Ship safety against capsize is a combination of good .

what is dynamic stability of ship