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Isn't that the point of a chain lead and setting scope correctly? So your anchor only "sees" horizontal forces? (And the reason we need to let out more line as the tide rises, cause it's moving the boat up.) The derating on holding power for incorrect scope is pretty nasty.
I asked Lewmar (They make Delta Anchors) if they have a size to holding force table.
They sent me an "anchor size" to "Foot of boat length" table, but not quite what I was looking for. I'm sure they have it, but the question is can I find someone customer facing who has it.
Looks like a ~40lb anchor can pull between 1,500 and 5,000 lbs.
http://newcontent.westmarine.com/content/documents/pdfs/WestAdvisor/2006-Anchor-Tests.pdf
Hmmm.... Need to see how the 80lb versions did.