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The purpose of this paper is to examine the roll damping characteristics by bilge keels on the fishing vessel . Unlike other degreeof freedom motions , roll motion is highly nonlinear . However the quantitative evaluation of roll damping combined with wavesis very important for the fishing vessel . To reduce roll motion , roll motion stabilizers such as a bilge keel is used due to easymade and cheap cost rather than anti -rolling tank and fin -stabilizer . Authors paid attention to the shape of bilge keel and wavesto grasp the roll damping for the fishing vessel and studied about the difference of tendencies of roll angle following the shapesof bilge keel . The model ship was the offshore large purse seiner and four types of bilge keel were used . The data from the ex -periments were provided and analyzed to investigate the rolling characteristics of the model ship being affected by the waveheight , wave period and bilge keel shape . The results of the study showed that three types of the bilge keel have little effective ,but only one has an effect on the roll damping . So bilge keel shape and its attachment method need to be a future study for thepractical use in fishing vessel .Keywords : Roll damping , Bilge keel , Offshore large purse seiner , Wave height , Wave period , Rolling characteristics

An optimal bilge keel design to reduce the rolling of the offshore large purse seiner