Is my Rocna to big?

[Lepke]

An anchor is also safety equipment and should be able to stop and hold the boat in any condition.

[buzzstar]

Originally Posted by Lepke

An anchor is also safety equipment and should be able to stop and hold the boat in any condition.

Sort of, but not just stop; hold as well. Generally, not just one anchor in extreme conditions, perhaps three, and a nice hidy hole among the mangroves. Hope I did not open the door a bit more toward a comprehensive anchor discussion. Please, any moderator should feel free to detete this post if they think I did.

[Glennwaus]

There are a couple of thin that you can't have that are too big....and an an chor is one of them!!

[Cormorant]

Originally Posted by Glennwaus

There are a couple of thin that you can't have that are too big....and an an chor is one of them!!

The other thing is one's . . .


Vocabulary

[Elie]

There is an old saying in Britanny: 'Too stong never fail!' And Bretons know a thing or two about the sea, and sailing.
I bweleive that you won't regret you anchor size... unless your windlass quits...

[skipgundlach]

Originally Posted by Wallaby

I have a 33 Rocna on a 50ft 36K pound sailboat. It is an excellent anchor, though I depend on an oversized Fortress for really bad weather.

The issue of the bow roller is a big one. As the anchor comes up to the bow, you are dragging a 25kg load over 90 degrees with a two inch lever (initially). A bigger diameter roller is obviously better. That small single roller causes huge and unnecessary loads on the windlass, the roller itself, etc.

I made my own double roller, swiveling on the same bolt as the original roller. Problem vanished, retrieving the anchor is a breeze.

The basic design is a 1/4" thick stainless channel, 12 inches long, about 3" inside width, and about 2+ inches high. I had one welded up. Next, drill two sets of holes near the ends, and one set of holes in the middle. Insert new rollers and bolts in the end holes, and a bolt through the bowsprit and center hole. Total cost about $100 including the welding.

I'd send a photo but it is too damned hot to go outside.

You took the words out of my mouth.

But here's an entire gallery to show you what he means.

In our case, it was to avoid clashing the roller with our cage. But in the process, you avoid the stress he's described.

You can see lots more about our system in the whole gallery but click on the #6 for just the modifications:

Pictures: Flying Pig Refit 2011-2012/Anchor System Refit

L8R

Skip

[Flod]

I'm also based in Scandinavia and recently changed my delta for a 20kg rocna. I wanted to go for the 25kg but it was sold out and it would have created problems with my "dolphin nose" bow I think. The 20 kg fitted the bow roller without a problem just as nice as the original delta. I have been on the hook a couple of nights the last weeks and it have worked really well. Lots of wind (15 m/s), wind shifts and No dragging. My boat is a dufour with 7,5 ton deplacement. That said I would stick with the 25 kg if I where you. I'll post a pic of the bow roller with the rocna on tomorrow so you get some ideas of how it can look

[softdown]

With this Coast Guard, I can hardly be bothered with worrying about my boat:

Coast Guard pupper

[arsenelupiga]

funny how people believe extra 10 kg of anchor weight on 10 T boat will make them safe so they can sleep overnight

its like I am listening to anchor salesmans or armchair sailors.

Anchor shape is most important, same anchor shape different weight will be equally efficient is same substrate. Learn some physics. Extra weight may improve holding maybe couple % of cases, but by far not enough to go to worry free sleep.

I suggest smaller anchor, so you do not fall into false security mood.

[skipgundlach]

Ehhhh....

Heavier anchors are nearly entirely a matter of surface area (relationship of surface area to weight).

Bigger shovels are harder to pull through the bottom...

[kas_1611]

To add a little extra to the discussion my 33kg Vulcan fits perfectly on the original bow sprit/roller as installed for the original 16kg Delta we had. In fact the shank is slightly shorter due to the curvature. And yes there is enough clearance between the tip and the hull so it doesn't bash.

However the 25kg Rocna and Mantus, both of which I was considering when I upgraded, were too long to fit between the actual roller and my windlass. It was this that kind of forced the decision to go for the Vulcan.

Having read through the thread I will look at getting a larger roller made for my set up to help bring the Vulcan back up. Might stop it catching on the end of the bow sprit, which it has a habit of doing at present. Nothing stopping short and hooking a short line to manhaul it up and over doesn't fix but it's still a bit of a pain in the posterior which if I can resolve would be good.

[arsenelupiga]

Originally Posted by skipgundlach

Ehhhh....

Heavier anchors are nearly entirely a matter of surface area (relationship of surface area to weight).

Bigger shovels are harder to pull through the bottom...

true when anchor does not move deeper because of stone etc. If it does, deeper it digs harder is to progress and will eventually stop.

10% longer anchor, same shape would be 33% heavier and 20% more surface area, meaning 20 % more force required when can't go deeper. I do not think it is enough for care free sleep.

[Flod]

Pics of the 20kg rocna on my bow

[noelex 77]

Originally Posted by arsenelupiga

I suggest smaller anchor, so you do not fall into false security mood.

I recently tried out your perfect anchor .

[Flod]

@noelex77 I want that for my 2m dingy [emoji2]