Ok. Not all chain, what do you use?

[Franziska]

We use a kind of hardwood dowel and two stainless shackles to attach the bridle.
Basically the 3 strand gets jamed in that contraption.
Unfortunately I don't have a picture of it right now.

[roland stockham]

[QUOTE=StuM;2699607]I wouldn't use dyneema for rode. Big reason is that it floats.


We're not all chain, but we do have about 70 metres of it before the three strand rope. [/QUOte


second reason is that it will pull ot the anchor or break. The strength of a rode is in its ability to absorb shock loads, either by stretch or canteanary, dynamee has neither

[roland stockham]

For serious cruising and ideally on all boats you should have 2 bower anchors and rodes. If an anchor gets completely fouled you need to drop it (with a marker bouy) and come back to retrieve it later. without a second anchor that leaves you wth only the kedge which is unsafe
So my primary roade is 100m 10mm chain and the secondary is 50m 10mm chain plus 50m 20mm octi-plait nylon (stows well and stretches extremely well). So I havethe best of boat worlds.

[cuffy]

I have spliced a loop of dyneema that is always at the windlass and use the klemheist to attach bridle to rope.

[Compass790]

We are not a multihull but we use chain/nylon in rocks, sand ,weeds & mud. Wouldnt be too keen in coral with bommies. We use a snubber as well which is about 20mm 0-ring style rubber about 5 metres when wind is over about 30knts. Taking the shock load out is a lot easier on us & gear. Normally try & make sure nylon is up off btm in rocks, we are divers so usually check. Use 2 anchors over 30knts if not in large current that reverses or obvious wind reversals as can tangle. Danforth style main anchor & CQR backup but don't like the CQR at all. Just regard it as extra weight really

[Benz]

Originally Posted by Franziska

Interesting training wheels, I'd have thought the Dyneema might slip if used as a Prusik. Never had that problem?

The dyneema prusik will not slip because it is a far smaller diameter than the nylon rode, and it's squeezing it pretty hard. If you tried to put a prussik onto dyneema rode, it might be more slippy.

[thinwater]

Originally Posted by Training Wheels

I’m an oddball. I use 120’ of 1/4” G70 with 300’ of 1/2” Sta-set polyester. I have climbing line I use for a bridle, that I can let out to 40’ legs. I’ve yet to put out more than the chain, with the bridles attached to the shackle joining the chain and rope. I use a Fortress FX-23 anchor.
Did I mention I am the windlass?

Why polyester instead of nylon or chain? Better abrasion resistance than nylon, and easier handling than chain?

[thinwater]

Originally Posted by Franziska

Actually the stretch is something desirable in my eyes, at least to some degree.
It means that you are not yanking with full force on both ends (boat&anchor).

Thats why we have avoided something like Dyneema, it has no stretch. The only reason I could see for adding a short stretch of Dyneema following our 15m of chain would be its very high chafe resistance and low weight.

It's just a thought.

Let's say 15m chain+10m of thick Dyneema followed by the 3 strand.

12-plait Dyneema is NOT abrasion resistant when sawing side to side on rocks. I've done the testing several times when studying both lifelines and rodes. It needs to be covered.


https://www.practical-sailor.com/iss...e_12465-1.html


I've been using 6' of chain backed by a covered Dyneema leader, backed by nylon for some years. That was on a 24-foot cat. I'm now just using 6' of chain with a chafe over over the first 20 feet of nylon. No chain at all on the kedge/secondary anchor, just the chafe leader. Very light, no chafe, though generally not around rocks (sometimes). Either combination is quite effective on chafe, about 20 times better than rope alone. Check the link above.

[thinwater]

Originally Posted by Franziska

Interesting training wheels, I'd have thought the Dyneema might slip if used as a Prusik. Never had that problem?

It can, but very unlikely. But I have had it happen on mooring lines.



Many Dyneema climbing slings blend in a little polyester for this reason (friction). They don't slip until over 1200 pounds.

[sirfer]

We have 33m of chain, and 100m of 8 strand spliced onto it. I use a rolling hitch to attach a short length of dyneema, looped at both ends, to either the chain or the rope, and attach the bridle to the dyneema.

[tenchiki]

I think it would be worthwhile to check out the book "Anchoring & Mooring the Cruising Multihull" by Mark Johnson. It covers much of the discussion from the point of view of someone who has extensively cruised his trimaran.

[thinwater]

I find it curious that a typical anchor chain thread can run go hundreds of responses, when far more people probably used rope. Really, there is far less to talk about with chain. They debate catenary endlessly, when the math describes that readily. Breakage and chafe are non-issues. Strength is easy to judge by measurement and standards.



The behavior and evaluation of rope strikes me as far more complex. I've used both, lots.

[Franziska]

Thanks Thin water.

Still, as stated in post one there are reasons to go mixed.
This thread bases on the fact that someone has taken that decision already.
This is not the place for another all chain vs. mixed discussion.

Thanks.

[thinwater]

Originally Posted by Franziska

Thanks Thin water.

Still, as stated in post one there are reasons to go mixed.
This thread bases on the fact that someone has taken that decision already.
This is not the place for another all chain vs. mixed discussion.

Thanks.

That was not my point. Different rodes make sense for different applications.


My point is that there are darn few responses in proportion. There so many topics:

• Abrasion, of course. This could be about chain, other leaders, and even polyester for part of the rode.
• Stretch. It has been suggested there can be too much, leading to increased yawing. This is almost certainly true. Stretch can be controlled by changing rode material or the amount of nylon in the rode. For example, a cat with 100 feet of rode out, 30 feet of chain, and a 20-foot bridle, only has 50 feet of rope out (since the bridle can be non-stretch).
• Evaluating strength of used rope. I've seen very little useful on this. A bunch of rules of thumb that do not appear to have much basis in testing and don't yield a useful answer.
• Dealing with wind-against-tide situations. Generally a non-problem for multihulls because the foils are either shallow or retractable.

[Franziska]

Ok. Sorry I guess I misunderstood what you meant. Good questions to ask.