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Boat is 15 Tons (43 feet). Anchor is 33#. Rated for a 53' to 65' boat.

Seems light to me, aluminum I assume? My old boat was 11 tons and I
was using a 44 lb Spade. Only problem setting that I ever had was in
really soft, silt like mud. Lots of scope and a bit of settling time
fixed that one.

It rated for a boat far larger than ours. That's my rule-of-thumb. Take what
the manufacturer recommends and go one or two sizes larger. It has worked
very well in mud, no problems whatsoever, as good as my 66# Bruce.

Presently I'm using a 120 lb Spade (30 ton boat fully loaded) which I
used to replace a 60 lb Bruce. The Bruce always set and held very well
but I was concerned about its reputation for slipping under heavy load.

Never heard that reputation. I've used the Bruce in some pretty nasty
conditions and never had it slip.

The pre-purchase surveyor that I used said that he regarded the 60 lb
Bruce as a bare minimum. and not suitable as a storm anchor.

It's not normally considered as a storm anchor. The Fortress seems to be
well regarded for this purpose.

Doug
s/v Callista