Abstract
Fishing vessels must have good stability and manoeuvrability. Hull with round bottom shape has a relatively poor rolling duration compared to other forms. Rolling duration reduction will improve the quality of stability of the ship which can be obtained with bilge keel installation. The objectives of this research are 1) to compare each parameter value on model ship by using bilge keel and 2) to determine the minimum ratio of bilge keel's length toward waterline length on the model ship which still has the ability to reduce rolling motion on the ship. The method used was giving treatment to model ship and observing its rolling motion with different lengths of bilge keel. Based on the result of the research, it can be concluded that bilge keel installation with some length ratio toward length of waterline has different results significantly, and bilge keel with length ratio 0.2 still have effective capability in reducing the rolling motion of the model ship.
Highlights
Fishing vessels are used for fishing operations in the sea
The hull shape used in this study is round bottom which is commonly used in Indonesia
The quality of the stability of a ship can be seen from the amount of rolling duration which occurs when the ship performs rolling motion, in which the ship’s stability lowers with the rising of the rolling duration
Summary
Fishing vessels are used for fishing operations in the sea. Fishing vessels must have good stability and manoeuvrability. The shape of the hull on fishing vessels in Indonesia has different forms, namely U-bottom, round bottom, round flat bottom, hard chin bottom and akatsuki [2]. Fishing vessels in Indonesia use a round bottom or round flat bottom hull shape. The hull shape used in this study is round bottom which is commonly used in Indonesia This form of hull has the least stability compared to other forms [3]. Bilge keel is a fixed construction mounted on a ship that is almost perpendicular to the hull of the ship as a means to stabilize the vessel from the rolling motion [4]
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