To answer that question, here are some hard figures. This data is independent; it is from West Marine's 2006 anchor testing, which involved no less than fourteen types, three locations, and three different scopes (3:1, 5:1, and 7:1). The testing was written up in SAIL magazine (USA) and Yachting Monthly (UK), and the graph below was published in SAIL (October 2006, page 63):
"Max before releasing" is the force the anchor withstood before moving (i.e. the effective holding power) and is the critical indicator of performance.
For more about this testing including comments from West Marine, check out our knowledge base article on independent comparison testing, Click here »
If you have any queries about this information, we will be happy to help – use our contact page.
It’s difficult to photograph most tests, since under increasing load the Rocna commonly buries itself totally, disappearing from sight. You can see this in our videos. The photo on the left shows one such buried demonstration model (we have actually cleared most of the covering sand away by hand) – this Rocna 20 got this far before the 20mm rope we were using snapped under the load.
Our videos are the best way to see for yourself the setting performance of the Rocna, as well as experience how it compares to other anchors.
For a brief overview of the Rocna and comparison with other popular anchor types, watch the following (silent) video (2.5 minutes):
For extended testing footage (8.5 minutes) with commentary from Pete Smith, designer of the Rocna, click here:
For some real world photography, i.e. underwater, check out our knowledge base article on setting your Rocna anchor.