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Old 19-08-2020, 21:52   #91
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Izikalvo's Avatar

Join Date: Sep 2015
Location: Mediterranean
Boat: Jeanneau 43DS
Posts: 165
Re: Viking anchor , now where have I seen this before.....

Rocna has a double thickness of steel in the toe.* It may offer strength (as the extra engineering of the Spade and Excel offers strength) but it certainly offers ballast. If you wanted to engender strength you do NOT need all that steel.* *In fact, if you measure the extra thickness of the steel in the Rocna toe it is almost identical in volume (and thus weight) to the ‘ballast' in a Spade or Excel.* The difference is that the ballast in the Rocna is ‘spread out’ and the ballast in the Excel and Spade - focussed.* Spade offers more focussed ballast because it is lead and thus has a smaller ballast chamber.

Take that extra weight out of the Rocna and it simply would have the hold of a similarly weighted Delta because the balance would be wrong.

The extra steel in the toe of the Rocna might be some special lightweight steel but I doubt it.

Supreme like a Rocna is also ballasted, it has a large plate of extra steel in the toe.* *Rocna welded the double thickness of steel in the toe but now cast.* Manson with the Supreme - edge weld.* both Rocna and Supreme have ‘extra' plate thickness in the toe*which is ballast!It is a common error to think that Rocna, et al, are unballasted and if you look close enough you will see that behind Rocna's both designs hide a shadow of Spade and it is perfectly OK.* **As for Viking, Viking has no ballast, most of the weight of the anchor is in the fluke and it is the fluke surface area that generates hold. In order to maximize the hold, the crown is to the rear of the fluke.* Ballasted anchors like Rocna, Spade, Excel, Delta have the crown forward about*30% of fluke length forward.* Unballasted anchor like Viking ….. and Bugel, Fortress, SARCA, Bruce all have the crown at or near the heel.*

If you examine Mantus you will note it has no ballast but the crown is not at the heel - so suggesting that Viking is a copy of a Mantus is far from the truth.* The profile of the Viking fluke, its plan, is undoubtedly like a Mantus and the same as Rocna and Spade.* We looked at different fluke profiles, the one we use is a combination and modification of many.**We also did not ‘copy’ Spade, we tested and used what we found to be the optimum*fluke profile to become Viking.
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