Tanker is a ship designed to transport oil or its derivative products. There are main types of tankers including oil tankers, chemical tankers and LNG carriers. The tanker studied is a gas carrier tanker, in which the level of accident risk is considered more. The level of stability of the Tanker ship is influenced by the wave activity in the ocean. So that in this study, the design of ship rudder roll stability was made with sea state 1 to sea state 7. The response results showed the maximum overshoot rolling value reached 2.2 degrees with step time -1 and the settling time of 60 s at sea state 7. Rudder is in a steady state with a 10 heading at a time of 55 seconds.

Keywords : Tanker, Rudder Roll Stability, Sea State 7.