Abstract: The settlement characteristics of anchor in water, such as drag coefficient, equilibrium depth and equilibrium velocity, are of great significance to the calculation of anchorage force, the analysis of ship stability and the design of buried depth of submarine pipe and cable. In this paper, an empirical formula for calculating the drag coefficient of the Hall anchor when it falls freely in water is proposed through theoretical analysis and physical model test. The results show that it has an exponential function relationship with water depth and anchor mass. For the anchors of representative ship types corresponding to different channels, the minimum equilibrium depth is greater than the channel depth, and the actual touchdown velocity in the channel will be less than the equilibrium velocity.

Key words: Hall anchor, drag coefficient, equilibrium depth, touchdown velocity