Rocna Anchor Failure

[Simi 60]

Originally Posted by zboss

The anchor isn’t a rocna and that shackle isn’t the shackle on that anchor. The anchor was tied off to the boat.

Looks like a lewmar delta to me.

[Mike OReilly]

He says he lost the Rocna. I presume the one shown is the backup anchor.

[Smokeys Kitchen]

Thanks for coming back alc.

I am kind of with Mike on this. I do not see a 'head' on the shackle pin, so I don't even see a way to secure it to the shackle.

This isn't one of those spring loaded type pins is it?

Ron

[thinwater]

Originally Posted by Mike OReilly

He says he lost the Rocna. I presume the one shown is the backup anchor.

Exactly. That is what it says if you read it closely. He also noted adding a back-up line.


If there is a risk factor, it is that the anchor chain is not tensioned and thus the anchor can snatch on the chain.


Why a stainless D-shackle and why the pin through the anchor (instead of an anchor shackle with a bow)? Is something else missing?



But I'm not feeling it.

[Breaking Waves]

Originally Posted by Smokeys Kitchen

I do not see a 'head' on the shackle pin, so I don't even see a way to secure it to the shackle.

It is almost surely an Allen head.



winchard makes a whole line of them Wichard Self-locking Allen head D shackle

They have an 'indent' in the threads, so they 'self-lock' (will not vibrate loose, at least not easily). . . but I personally would always use some locktite on them also.

[NYSail]

A tidy thief would put the shackle back and dust the deck. where is the broken piece.... would have been a big chunk of metal.

[Sailing Drummer]

Assuming the Rocha was attached exactly like the picture shows with the other anchor, there’s a chance side loading damaged the anchor the last time it was used. And then maybe a rough crossing caused it to completely break?

[SailFastTri]

This is easily explained if he used 2 shackles and one is stainless. Stainless is prone to unexpected and sudden fracture under low load. I had one give way at the clew of a roller furled genoa.
OR this thread was started as a BS troll put up by a Rocna competitor.

[NorthernMac]

If it was just sitting up on the bow like the other one, didn’t have obvious damage, then while on deck had enough of a jarring that the shaft/eye broke off the anchor and the anchor and broken bits of anchor all went off the boat, I’d think you were in conditions ruff enough I’d expect damage the the boat as well, especially around where the anchor must have been violently thrashing around.

I’d wager it was removed on purpose

Originally Posted by SailFastTri

This is easily explained if he used 2 shackles and one is stainless. Stainless is prone to unexpected and sudden fracture under low load. I had one give way at the clew of a roller furled genoa.
OR this thread was started as a BS troll put up by a Rocna competitor.

There’s low load and there’s just hanging out on deck, I’d wager you could store a anchor made of glass on deck and have it not just fall apart.

[sailasia]

Self locking allen head shackle? Nope. Wrong application. I notice even the spare anchor shackle (which is different) is not seized.

[Island Time O25]

The shackle is clearly not locked all the way - about 2-3 turns out. And the pinhead is way out. If that's the way the anchor was secured perhaps it worked the anchor lose. Given the motion of the hull underway would not take too long for that to happen.

Version B - OP knows the reason but still wants Rocna to pay for the loss and is drumming up the buzz to get them to listen.

[BugzyCan]

I am betting on a thief, they left the shackle so it would not make any sound when removed, and even did it partway back up to confuse the owner.

Buy a new one and forget about it.

[Sojourner]

Originally Posted by SailFastTri

OR this thread was started as a BS troll put up by a Rocna competitor.

Literally my first thought. But then again I'm a cynical one...

[BlackHeron]

IMHO wrong shackle, subject to side loading, which can be extreme in some cases, and resulting damage of shank slot beyond the yeild strength. Movement on deck finished it off.

Even if this guy had noticed the damage the last time it was raised the anchor would have been ruined anyhow. Steel is what, $0.20/ lb as scrap these days? He lost a few bucks from the scrapyard over burial at see.

If it were a Mantus then a new shank could have simply been bolted back on after removing the damaged one. Use a bow shackle next time with seizing wire and it will never happen again.

[NormanS]

Who goes to sea with their anchor secured only by the chain? Mine has a locking pin through the cheeks of the bow roller, but failing that, it's surely normal to have some sort of lashing. There's something a bit mysterious about this story.