Other anchors took similar distances, generally 35-50 feet. When we tested 2-pound mini-anchors we got scaled down results; setting took 5-10 feet, sometimes longer, and there was never a hard stop.
What does this mean? Let's look at the green curve showing a good set (most were worse):
27 foot boat, 13-pound Danforth (assume 3x less holding than FX-37 and 1/2 drag distances)
- Setting force 250 pounds (750 equivalent) = 15 feet setting distance.
- ABYC storm force = 1200 pounds (3600 equivalent). Drag
- If 2 anchors set with some allowance for single leg loading, probably move another 25-35 feet during extended setting (see comments in prior post).
- Setting force 750 pounds = 30 feet setting distance
- ABYC storm force = 3200 pounds. Drag unless 2 anchors are set. May stay with good snubber or deep water, but probably not.
- Setting force 250 pounds = 15 foot setting distance on both.
- ABYC storm force 2600 pounds. With both anchors set in a shallow V. Theory says I should drag, but...
The Delta Anchor moves around even more in mud, which is why I changed to a Mason Supreme (I have also tested Rocna and Mantus anchors--all very similar, which is better seems to depend on the bottom, though I'd buy a Mantus if I had it to do over) and up-sized from 25 pounds to 35 pounds. Mass always helps.
But everyone moves in soft mud. Don't let them tell you otherwise.
Note that twice the Fortress dis not really set at all.
And a couple more, just to think about...