Study on Roll Characteristics of Small Fishing Vessel Part I Measurement of Roll Damping

Abstract

In this paper, roll damping characteristics of small fishing vessels are investigated experimentally. Measurements of the roll damping, the sway damping and the cross-coupling dampings of four small fishing vessels are carried out to reveal that the ratio of the wave damping component and the viscous damping one strongly depends on the hull shape, the appendages, the location of the center of gravity and the loaded conditon. The roll damping of two fu11-scale vessels is also measured and shows fairly good agreement with model expriments. This result suggests that the scale effect on roll damping is not so significant for such a small fishing vessel.