Rocna anchor question

[sailbleu]

I'm in the final stage of finishing my own stainless steel rocna anchor and I have a question about the hole at the end of the shank , more specifically the shape of it.



Why is that hole oval ?
Is there any particular reason for that ?
Is that a necessity , because it is very hard to realise in a (my case ) 2cm thick shank you see

Regards

[sitara]

I have a Rocna 15 (galvanised) on my SO36i with 10 mm chain. The two are simply shackled together with a simple D shackle. I can see no point to the oval hole. The anchor works well and sets easily but I have not used it in nasty conditions yet.
I look forward to seeing your photos Sailbleu.

[sailbleu]

Hi Sitara , I also dont see any major reason for the oval slot.
It's not that it works like a sarca shank slot similar to the manson supreme .
The rocna slot is too small for that , and besides , I would never have a sarca slot because it does weaken the shank enormously doesn't it.
I will most certainly show you the pics as I documented the whole procedure.
Today I'm about to finish the rollbar ,..... bending it that is.
I guess tomorrow or the day after I will weld the shank to the anchor plate , leaves me to give the finished anchor that polished SS shine

Regards.

[manaia]

I decided on the Manson Supreme, as the cost was lower and from what I could see, the performance was similar between the two of them. We chose a 20kg model and It fits just right in the bow roller, the boat had a CQR 45lbs previously.

We have had it for just over a year now and have been very happy with it, we have had a a number of "windy" nights and in a variety of bottom types, it had not failed.

Of course, If I had Sailbleu skills, it would have been even cheaper !

[Tafika II]

So you can use a "D" shackel (1) instead of one on the anchor and one on the chain. I have SS swivel on mine. Fortress also has this design. I like it better than the Manson. Have never had a problem with my Rocna setting the first time and holding...great piece of equipment!

[sailbleu]

Manaia,

it's not so much the skills that count , 50% of the job are tools . 25% is interest , drive or dedication . The other 25% could be referred as skills that can be aquired by anyone having a fair dose of the previous 25% .
In the meantime I got the rollbar nicely curved yesterday. Infact it's already welded on and looking good if I say so myself. Pardon me for any immodesty

I suppose today the shank will be united with the anchorplate , making me a proud member of the Rocna-club
The whole thing turned out to be a fairly massive object ,what should of been 25kg resulted in more than 30kg to be precise.
I'll explain later on in my essay.

@ Tafika,

thanks for confirming the D shackel thing , yesterday I've raised the question here and there and came up with the same explanation . The shank slot is made in way (oval) so the shackelpin can run through the chain, not the shank , only one shackel is necessairy.
Does that mean no swivel is needed ?
I've always considered swivels to be a weak pointyou see.

Regards

[manaia]

Hi sailbleu,

Thanks for the inspiration but I will wait and admire your handiwork !

I think a heavier anchor is better -

I have added a swivel, a good quality one. I had cases with the anchor spinning and after reading some 'destruction tests' for swivels (and chain), I have been happy with the result (so far !). Perhaps this link has been raised before, but here it is.

coxengineering.sharepoint.com/Pages/Connectors.aspx

I have added a shackle at the anchor end and one at the chain end to assist with the swivel articulating and hopefully reducing the strain when the swivel and anchor are at odds. . I have not used the long slot and don't intend to intentionally anchor in rocks...

[dilligaf]

I have been using the Rochna anchor throughout the So. Pacific after using a Delta. We found that we did drag anchor in Alaska since then we found the Rocha is the perfect anchor so far. Remember though you must use an alloy shackle when attaching to high test chain. The chain is stronger than a regular shackle pin. Using an alloy shackle will come up to the loads the Rocha anchor will hold. The difference is that the Rochna will set quickly and the need for a stronger shackle. The requirements are in the paperwork you received from rochna.
I hope this helps, we are very sound sleepers due to the trust in the anchor system we have.
S/V Dilligaf lies in Brundenburg Oz