The mud tests suggest that when looking for a good anchorage a sand bottom is worth seeking out—because it’s easier for any anchor to ‘bite and develop maximum holding power.
After testing anchors now for three years, Practical Sailor also offers the thought that an anchor rarely is “set” if that means immovable. Watching a big dynamometer for hours indicates that an anchor, under a moderate to heavy load or subjected to jerking, is always oozing along, parting sand particles, mud or rubble… always slowly “coming home,” which is a good old marine term for dragging. This motion can be seen in the repeated grab-and-break behavior of most anchors as they are setting. It also is revealed when the dynamometer needle, after being run up past 500 pounds, starts slipping back almost immediately as soon as the retrieval winch is stopped. If dug in deeply in a good bottom, an anchor’s movement may be indiscernible, even over weeks. However, we’re convinced there is movement, especially under a heavy load.
For more advice and information on anchoring, purchase the ebook Anchoring in Sand and Mud from Practical Sailor.
