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Not an anchor engineer here, but the Rocna just looks like a spade with a roll bar. Its hard to imagine how that would make it less effective, although, I wouldn't guarantee it to be more effective.
One of the things I have learned looking at all those boat tests (with lots of anchors) is that almost similar anchors can have very different behaviors.
If you look well they have common points but they have also differences and not only on the roll bar:
For Those About To Rocna…
Description - Ancre Spade Sword Skrew - Ancres haute performance -
This one looks more like a Spade and it is American, but I never herd about it. It looks good.
Ultra Anchors | Stainless Steel Anchors | Quickline USA
Last edited by PCP; 04-16-2011 at 11:18 AM.