Our boat came with a 25 kg Delta anchor. It was a big improvement over the CQR and Bruce that we have had on previous boats.
When our Delta was showing corrosion after 9 seasons and was due for re-galvanization, we decided to try the Rocna anchor as I had read some great reviews. Rocna anchor is categorized as the “New generation anchors” and was designed by Peter Smith.
Bügel anchor was the first “New generation” anchor. With the Bügel the plow form was replaced with a neutral “plow”. Spade and Rocna developed the shape to today’s concave form. It is not difficult to understand why a concave form of the anchor might result in higher holding power compared with a convex plow design.
We bought a 33 kg Rocna to Bella Luna. That is 8 kg heavier than the original Delta. (32%)
Just by the fact that the new anchor is 32 % heavier it should have considerable more holding power. I´m sure a Delta 32 kg would also have been a big improvement.
A Rocna anchor projects a bigger surface area compared with the same size Delta anchor.
Instead of focusing on the holding power I have focused our experiences on the differences in characteristics.
Here is what we have learned so far.
The Rocna sets extremely fast. You more or less get the feel that it sets exactly in the same spot as you dropped it. This is an advantage as it is much easier to position the boat in crowded anchorages. Also the risk for fouling the anchor is less, as it does not drag on the bottom before it sets.
As the anchor sets so quick, we can apply load with the engine in reverse immediately when the chain has stretched on the bottom. With earlier anchors we have always felt it was an advantage to give the anchor time (15-30 min) to work itself in to the bottom, before backing down on it.
We have so far never been able to pull the Rocna out of the bottom with the engine! It just goes deeper and deeper.
It is more a question how much load we dare to put on the windlass, whiteout a snubber line. We heard stories from some Rocna owners that you had to be careful when backing down on the anchor as it sets so fast/hard that you risk damaging the anchor equipment. In some extent this is true. When we went to fast in reverse with other types of anchors they normally just dragged and refused to set. The Rocna will set.
Rocna cuts thru thick weed better than any other anchor we have tried. We had some anchorages in heavy kelp on the west coast of Norway. I was surprised that we were able to set the anchor.
Rocna brings up a big chunk of mud. A good deck wash pump is an advantage.
We are still waiting for the first time it will drag! I´m sure it will, as there is a limit for all anchors. Of all the upgrades we have done in the last years, this is the one we are most pleased with.
In next post I will describe what we did to make it fit on a HR 43.