Our Rocna Anchor experience

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Greetings all,

I thought our experince with a Rocna may be of interest to someone. We have a Bavaria 42 and have been living on it in the Adriatic for the last 3 and a half months. Started in Slovenia, then sailed Croatia and are now in Montenegro, soon to head to Greece.

We have anchored on 80 to 90% of nights in a lot of different anchorages and conditions.

We have a 25kg Rocna anchor on 50 metres of 10mm chain.

All up, it has dragged twice. First time was in the harbour of Komiza on the Isle of Vis, Croatia in what we later discovered was a notoriously bad anchorage (although the pilot books don't refer to it as such). Only about 25-30 knots of wind but bottom is thick weed and very poor holding. About 40 boats anchored, virtually all dragged and we would have been one of the last to drag.

Second dragging incident was also on Vis, in Vis harbour. A much better anchorage but we were hit with an intense short squall of 45 to 50 knots. We dragged but it reset itself about 50 metres away.

Since this, we have been giving the boat more revs in reverse when setting the anchor. We used to just idle back onto the anchor and taut chain and sit there for a while idling in reverse to set it. Now we give it 1000 or 1500rpm in reverse. If we are not sitting stationary we pull it up and try again. Sometimes we need to try a couple of times before we are sure it is holding at 1500 rpm - particulary in weed.

We can't really meaingfully benchmark the Rocna as we don't have lengthy experience of using other anchor types.

I bought the Rocna after reading the anchor test in Yachting World that was published late last year or early this year.

It has held without problems on numerous 25 to 30 knot nights.

We do have a swivel on ours although the manufacturer doesn't fully recommend this.

Hope this info may be of use to someone.

Regards,

Ross.
 
[ QUOTE ]
All up, it has dragged twice.

Since this, we have been giving the boat more revs in reverse when setting the anchor.


[/ QUOTE ]

Ross,

presumably you havent dragged in weed since using more revs to set the anchor? Personally, with my plough, I rev slowly up to 2000 revs to set it, (and no longer even try to anchor in weed).

Also, how many times might you have to try again if it doesnt set, (only since you started using more reverse to set it).

It will be interesting to hear Craigs comments on your experience
 
Hi,

The worst was 3 or 4 times trying to get it to set in weed at 1500 revs (in an anchorage noted in one of the guides for unreliable holding - Tiha, adjacent to Cavtat, Croatia). It wouldn't set at 1500 but would set at 1000rpm so we made do with that as our windlass was overheating after retrieving the anchor multiple times.

Regards,
Ross.
 
Just ordered Rocna myself from www.roschmarine.nl - dealer recommended by Rocna.
My choice base dalso on recent tests being tured that my CQR which came with the boat almost impossible to set on weed and hard sand we have here on Cyprus.
 
We have been using a 55 lb rocna on our lightweight Oyster 41 for 3 months now mostly in La Linnea and rivers. Has been great. the big difference to our 45 lb CQR is that the digging in is sudden with the chain coming bar taught and jumping on the windlass, we rev to about 1500 to bed it in after stopping quite gingerly.
 
Personally, it doesn't surprise me if you dragged after 'setting' the anchor only using gentle/idling astern revs. I always bed my anchor (CQR) by making sure it would take a prolonged burst (20/30 secs) of full astern.

Generally, I reckon that's about equivalent of the force of a F5/6 wind, on the basis that, if I try to motor hard astern in a F5/6 she won'make any way astern (not anchored) in such a wind but doesn't get blown downwind either - the forces are more or less balanced. I wouldn't spend the night on an anchor that hadn't bedded well enough to take a F5/6, especially in tidal areas!
 
You don't mention one crucial factor which affects anchor performance - scope/depth ratio you use. 4:1? 6:1? makes a difference . . .

If you're in an area where the odd 50kts crops up (Adriatic springtime, downwind of some Cyclades islands in a meltemi, Rhone valley shoreline. . . ) You should test your set with full astern. That'll simulate the force of the surges as the vessel tacks back and forth around it's anchor.
 
[ QUOTE ]
It wouldn't set at 1500 but would set at 1000rpm

[/ QUOTE ] That isn't set . . . if it won't hold at full astern or very nearly then you are just kidding yourself.

1000 rpm is maybe the equivalent of the windage on your boat in a F3
 
[ QUOTE ]
Hi, may I ask where you bought your Rocna? I'm at the top of the Adriatic but can't find a seller for it.

[/ QUOTE ]

My understanding is that, in Europe, you can get one from Eire, Holland or New Zealand
 
[ QUOTE ]
That isn't set . . . if it won't hold at full astern or very nearly then you are just kidding yourself.

1000 rpm is maybe the equivalent of the windage on your boat in a F3

[/ QUOTE ]

That is my thoughts too as with SimonCR. We set our anchor by a short bit of reverse to get the boat moving astern, then in neutral until it starts to bite then tickover and gradually applied revs up to about 3000 on our Yanmar 44hp/41ft boat. If it won't hold that (and our Delta with minimum 3 x HW depth and usually more like 5 x all chain usually does) then I'm not going to sleep well at all. An anchor merely hooked on a bit of weed will probably hold at 1000rpm and will just uproot it in the first snatching gust.

I would never reduce the power applied just to fit the point at which it drags, if it drags it ISN'T set, so re-anchor or move, staying put and hoping is not an option in my book.
 
I have just returned from a month cruising the Adriatic in a multihull.
Used a 15kg Rocna. I'm afraid this year we dragged more than most.
To be fair there do seem to be a lot of anchorages with poor holding in Croatia.
And with a multi we only use only 25mtrs of chain with a windlass, so often the scope is only 3/1.
In previous years with Delta and CQR we had less chain but more rope and probably a higher scope, although not always. And I used a bridle more often previously.
 
Our Rocna (33kg on a 13 tonne boat) held perfectly and dug in right away in the anchorages we used in the UK on our trip South (Dover, Studland Bay, Chichester) and also did the job in Valle Gran Rey in the Canaries, La Gomera, although the holding was poor (thin sand over rock) and we had zero wind and little tide so not a good test.

We'll report more on our website re holding / anchorages as I always found the 'bumfuzzle' anchorage guide a useful list so we'll keep and publish our own.

PS - many thanks Nick (webcraft) for the San Sebastian marina recommendation, we loved being there and the kids enjoyed the marina's huge fish population ('look Daddy, it's a school of fish' says 5 year old Issie. 'Which one's the teacher?' asks 3 year old Max). We've left the boat there so hopefully I will be delighted with that in November too)
 
[ QUOTE ]
I have just returned from a month cruising the Adriatic in a multihull.
Used a 15kg Rocna. I'm afraid this year we dragged more than most.
To be fair there do seem to be a lot of anchorages with poor holding in Croatia.
And with a multi we only use only 25mtrs of chain with a windlass, so often the scope is only 3/1.
In previous years with Delta and CQR we had less chain but more rope and probably a higher scope, although not always. And I used a bridle more often previously.

[/ QUOTE ]

David,

Do you only have 25m of chain and no rope? 3:1 is probably your answer, RYA recommend 4:1, and you ought to have the flexibility to go up to 7:1 or 8:1 - I may have misunderstood you.

Was it setting and dragging, or not setting? Did you swim to have a look?

Did you not drag in previous years? I think there is an argument for more rope and less chain being more effective - It's in one of the articles that Craig refers to, (It's not a sales gimmick as it's not Rocna/New Gen. specific).

Lots of questions - sorry!
 
[ QUOTE ]
And with a multi we only use only 25mtrs of chain with a windlass, so often the scope is only 3/1.


[/ QUOTE ] I don't know of any anchor which can develop it's maximum performance with a 3:1 scope. Some claim they perform adequately with 4:1, and I'm aware of many designs which can't do their best unless they have 6:1.
 
Richard, the Rocna was initially setting but then dragging again.
We have rope as well as the 25mtrs of chain but tend to leave it in the focsle
due to problems with passing the rope/chain join thro the windlass hole.
However in a multi we are normally anchoring in less then 30ft.
In previous years we had 50ft (16mtrs) of chain but would let out rope as well
since pre windlass it easily passed thro the hatch. It seemed to work with a Delta
and CQR!!! It's possible I was letting out much more rope.
Which brings me to where do you get an anchor shackle thin enough to pass thro
the windlass deck hole without "help". (Idon't like rope/chain splicing).
The comment that chain/rope works better than all chain is interesting.
And seems to be my experience.
In fact the first time we backed up to a tree on Brac with chain and rope out to the Rocna
the stern rope did not go slack all night and I was expecting consistently good results.
But when you buy a windlass you are encouraged to go all chain!
 
Jim, I tend to avoid very long scopes since multis will sail round the anchorage all night!
Bridles help I know.
I know it's all subjective but I don't feel my anchoring technique has changed much, we spend some time looking for shallow water with the board up if nec.
But this year with the Rocna was not great. It does right and bury itself quickly in soft ground but on poor holding I remain unconvinced it's better.
It's easy to swim down and pass a line under the hoop though! We did it once when it jammed under a rock ledge. (That's how I lost the Delta!!).
 
>more rope and less chain being more effective

I don't buy that at all, it just isn't logical. Another issue is that out here all the cruising boats use all chain (well, all that I've seen do). Many charter boats use chain and warp. When the wind goes light and variable the charter boats start sailing around causing mayhem. Give me all chain all the time, we carry 300 feet on our main anchor so we can anchor away from crowded places, particularly if some are using chain/warp.
 

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