泥の海底における模型錨の把駐試験(日本航海学会第44回講演会)

抄録

Authors dragged JIS-stockless anchor (18.63 kg) and JIS-stock anchor (19.04 kg) at a constant speed 25mm/s in mud sea bottom. The results obtained from these model test were given as follows ; 1) When JIS-stockless anchor dropped vertically from a height of 1m, a ratio of dragging pull to anchor-weight reached to 4.16, but in a short time its ratio decreased to 1.23. Also the ratio in condition when the anchor was able to bury reached to 5.43, and the instability occured within the dragging distance of 4.2 times anchor-length and then the ratio decreased to 1.49. 2) The dragging pull of conventional stock anchor indicated a constant value 5.38 times anchor-weight and it had never turned on a axis of anchor-shank. It may be quite all right to considered that JIS-stockless anchor in mud bottom is not trip, as often pointed out.