As further real world experience - we have a 55lb anchor on our 13 ton
ketch, with 80m of chain. We've used for the last two seasons (and last year had only 60m of chain on), having sailed RG for 6 years before that with a
CQR weighing 65lb.
We changed because we were having endless problems getting the
CQR top set in the weed of the
Med, both endangering the
boat, and ripping up a lot of weed every
anchoring session. We extended the cahin in 2009 to cope with greater
depth, and the lighter anchor makes that easier to manage.
We are very happy with the
Rocna, with two issues. We like to have a pin through the anchor while on
passage, up to about 48 hour trips. We think this is safer than a
rope tie down and faster than a complicated
knot. This proved very difficult to achieve without making another hole in the shank. We think Rocna should allow for this with a small slot simply for that purpose (but of course it needs to be in exactly the right place for a
Maxi 120.
The second point is that as it sways a little when you tread on the shank or the fluke, it's a PITA to get off when coming in bows to in the
Med. The CQR sat flatter so it was easier to stand on to get ashore.
Neither of these points bear any relation to the Rocna operating as an anchor and are
very minor gripes compared to what we have found to be an excellent anchor. It has held us so far in up to 35 knots, including in 20m of
water on a 3.7:1
scope. Of course we haven't used it in tide, but swinging about in
wind has not been an issue: in any case we use a swivel in tidal
water. (this is a separate argument.)
It goes in, bites hard and stays put.