Anchor Shackle

[boatsail]

Originally Posted by s/v Jedi

but... 2 foot??! I have way more chain out than that and think a length of say 30' will outperform the two shackles with twist many times...

thats what i figured....if i had 100 foot of chain, that would surely allow enough twist to avoid the need for 2 shackles

[Cotemar]

Originally Posted by s/v Jedi

but... 2 foot??! I have way more chain out than that and think a length of say 30' will outperform the two shackles with twist many times...

Yes, you are correct for what is out as scope, rotation is not problem.
The two opposing shackles help when all the chain is already in and your anchor is close to the bow roller. Some cruisers at this point like to be able to rotate or orient the anchor to the proper position before bringing it home. Two opposing shackles make rotation easy. Not needed all the time just sometime.

Some cruisers say that their anchor never comes up backwards, so this option would be foreign to them.

[s/v Jedi]

Originally Posted by Cotemar

Yes, you are correct for what is out as scope, rotation is not problem.
The two opposing shackles help when all the chain is already in and your anchor is close to the bow roller. Some cruisers at this point like to be able to rotate or orient the anchor to the proper position before bringing it home. Two opposing shackles make rotation easy. Not needed all the time just sometime.

Some cruisers say that their anchor never comes up backwards, so this option would be foreign to them.

Ah! We have a sqivel actually and our anchor always comes up backwards... But it will turn itself, all 176 lbs, when the shank comes horizontal on the roller.

I can understand you want a half turn room which chain might not give with the windlass is close by.

[cfarrar]

If you use two shackles as depicted in the photo, with the shackle pin through the eye in the anchor, does this prevent the shackle from pivoting smoothly (in the eye of the anchor) in a veering situation?

[barnakiel]

On paper, a well matched shackle (i.e. pin one size up chain size) will outdo the chain BUT I have seen tests where shackles snapped much closer to their WLL than chains (In effect, well matched shackles snapped before the chain did).

So, the WLL counts little once we allow for the fact that WLL/BL for the chain and the shackle may be (and most of the time will be) different.

Solution?

Wichard HR.

b.

[Cotemar]

Originally Posted by cfarrar

If you use two shackles as depicted in the photo, with the shackle pin through the eye in the anchor, does this prevent the shackle from pivoting smoothly (in the eye of the anchor) in a veering situation?

The two shackles will work fine in a 90 degree veering pull just as well.

[boatman61]

LOL... guess no ones familiar with tightening the pin till its sticking well outa the other side... then give it a good bashing with a ball pin hammer... its gonna go nowhere..
Years of maintaining moorings and setting up my own anchors never had it fail.. 10/c of wire don't last long if your anchored for a while in a tidal area around the UK... abrasion will do it in in short order.
Mind... we do have serious tide's.. somewhere like Poole where I was based we have two highs for every low... go figure..

[fishtrap]

Respect Murphy's Law. If it can come apart, eventually it will. Always mouse.

[Hydra]

Originally Posted by barnakiel

Solution?

Wichard HR.

b.

Be careful with dissimilar metals underwater. The swivel on my mooring came undone because it was too close to a stainless thimble. And it seems that the stainless wire mousing eats the zinc layer on my anchor shackle.

I fear that an HR shackle could have the same effect on the anchor and the first chain link.

For this reason, I would stick to galvanized carbon steel for the shackles and mousings.

Alain

[boatman61]

Originally Posted by Hydra

Be careful with dissimilar metals underwater. The swivel on my mooring came undone because it was too close to a stainless thimble. And it seems that the stainless wire mousing eats the zinc layer on my anchor shackle.

I fear that an HR shackle could have the same effect on the anchor and the first chain link.

For this reason, I would stick to galvanized carbon steel for the shackles and mousings.

Alain

But its not shiney... how dya know when its gone...

[s/v Jedi]

Seizing wire used to be made from Monel but China bought it all. Monel does play nice with galvanized steel. Glad I have a decent stock of it.

[Sandero]

But of course... most people are using stainless wire to mouse their galvanized shackles including the pros who set up and rent moorings. Apparently, they survive a season to be replaced.

[barnakiel]

Originally Posted by Hydra

Be careful with dissimilar metals underwater. The swivel on my mooring came undone because it was too close to a stainless thimble. And it seems that the stainless wire mousing eats the zinc layer on my anchor shackle.

I fear that an HR shackle could have the same effect on the anchor and the first chain link.

For this reason, I would stick to galvanized carbon steel for the shackles and mousings.

Alain

I think this may be the case on a mooring but I only ever anchor for short periods of time: days, max. weeks.

If we look at the matter from a different angle, then one can imagine that a SS shackle being slicker will rub the zinc on the anchor less...

Galvanized shackles, I do not mouse them, I use the models with a collar and I screw the pin real well.

I like quality galvanized shackles above SS ones, but they are very difficult to buy today, unless one stocks up in a place that still has them.

b.

[evm1024]

Originally Posted by Cotemar

Yes it is an ACCO 5/16" G4 chain using Crosby 7/16, G-209A Shackle

They are snug, but mate perfectly.

Most cruisers are not aware of this chain to shackle combination and that is why I did the close up photos.

I use a 7/16" G-209a with my Acco 5/16" G70 chain. it does fit.

You can get G-209a at your local rigging supply (as in crane rigging). IN portland Or try Rigging products: Rigging Products, Inc. Sales Online

From the Crosby catalog:

Maximum Proof Load is 2 times the Working Load Limit (metric tons) and 2.2 times the Working Load Limit (short tons). Minimum Ultimate Strength is 4.5 times the Working Load Limit for metric tonnes, and 5 times the Working Load Limit for short tons. For Working Load Limit reduction due to side loading applications,
see page 8

[Cotemar]

You can now buy the Crosby G-209A Shackles from Defender
They stock them now after reading this thread.

Just gotta love the Cruisers Forum

http://www.defender.com/category.jsp...38271&id=33936