Best size of rope to extend a 10mm chain?

[Ian_Edwards]

Hi
I intend add 30m of nylon rode to my existing 10mm chain.
I'm thinking of 3 strand nylon, but what size and the most appropriate splice to use.
It'll need to pass through the gypsy on a Lewmar virtual windlass, which has a tight 90degee bend down to the chain locker, just after the stripper.
The gypsy is supplied as for rope and chain.

 

[thinwater]

Read the manual?

BTW, a standard backsplice may hang up. If so, Google "irony splice."

(But I don't get how 10 mm is 5/16". I think the correct method may be to get a short piece of rope and try it.)

68120043

10mm ISO4565, 5/16” Campbell S3, Lewmar 9.5mm G40

12-16

1/2 - 5/8

3-strand and 8-plait (5/8 only)

 

[yotter]

I have 8 ply nylon spliced to my 8 mm chain. I was not keen on the back splice method so did the long splice method which was not difficult (I forget the proper term). It does struggle to get gripped by my winch, but we have 60m chain so rarely need to go to the rope.

 

[Neeves]

Read the manual?

BTW, a standard backsplice may hang up. If so, Google "irony splice."

(But I don't get how 10 mm is 5/16". I think the correct method may be to get a short piece of rope and try it.)

68120043

10mm ISO4565, 5/16” Campbell S3, Lewmar 9.5mm G40

12-16

1/2 - 5/8

3-strand and 8-plait (5/8 only)

Imperial chain has a longer link than metric and maybe the 5/16th fits the gypsy but not the 3/8th" imperial based on link length not wire size.

Jonathan

 

[RunAgroundHard]

Use a multiplait rope. Three strand nylon will go hard, be awkward to handle and likely hockle. It’s a bad choice for an anchor warp.

 

[Neeves]

Should have down sized the chain = smaller and cheaper windlass, uses less power, chain takes up less room and you could have had the extra length with the same strength if you had chosen G70 - and no worries about splicing



Jonathan

 

[Stemar]

That's what I should do too, but it's an expensive option.

BTW, +1 for octoplait, for the reasons RAH mentions

 

[Neeves]

That's what I should do too, but it's an expensive option.

BTW, +1 for octoplait, for the reasons RAH mentions

Yes, I apologise.

Wait till you need a new windlass or new chain rode - or buy a new yacht.

I could not resist the opportunity

Some of us have 3 ply nylon surplus to requirement, we had 40m. It did go hard but not so much it could not be handled. We used it for a spare, or second, hand deployed rode with 10m of 6mm high tensile chain and a Fortress. As mentioned it was impossible to tightly splice - I did try - it was also a struggle to tame it round a bow horn cleat

Jonathan

 

[lustyd]

Jimmy Green has a guide with handy sizing table to show what size chain and rope will work together. The actual boat to chain sizing I'd take with a pinch of salt, but the rope size to chain size is useful.
Anchor Chain and Rope Size Guide | Jimmy Green Marine

Also a +1 for Octoplait

 

[gaylord694]

Hi
I intend add 30m of nylon rode to my existing 10mm chain.
I'm thinking of 3 strand nylon, but what size and the most appropriate splice to use.
It'll need to pass through the gypsy on a Lewmar virtual windlass, which has a tight 90degee bend down to the chain locker, just after the stripper.
The gypsy is supplied as for rope and chain.30m

Read the manual?

BTW, a standard backsplice may hang up. If so, Google "irony splice."

(But I don't get how 10 mm is 5/16". I think the correct method may be to get a short piece of rope and try it.)

68120043

10mm ISO4565, 5/16” Campbell S3, Lewmar 9.5mm G40

12-16

1/2 - 5/8

3-strand and 8-plait (5/8 only

Read the manual?

BTW, a standard backsplice may hang up. If so, Google "irony splice."

(But I don't get how 10 mm is 5/16". I think the correct method may be to get a short piece of rope and try it.)

68120043

10mm ISO4565, 5/16” Campbell S3, Lewmar 9.5mm G40

12-16

1/2 - 5/8

3-strand and 8-plait (5/8 only)

If you can get hold of some use bungee rope. Fantastic stretch facilities and easy to splice

 

[Neeves]

If you can get hold of some use bungee rope. Fantastic stretch facilities and easy to splice

What do you mean by 'bungee cord'?

edit 'bungee rope'

Jonathan

 

[thinwater]

What do you mean by 'bungee cord'?

Jonathan

I kind of assumed that was British humor. Perhaps wrongly.

I was out testing an ancient (maybe 15 years?) climbing rope's energy absorption capacity at the local crag today. I should probably retire it and start using the new one I bought. But I'm a cheapskate. It was just top roping--I wouldn't lead anything with it. By the time I'm done it will barely be suitable for rode or even snubber. Perhaps for my 1800-pound F-24, it would be OK. I guess that is where it will go next. It's nice and soft!

When I do retire it I will have to pull test a piece. I did 3-4 years ago and it was still about 90% strength. Hard to say, really, because climbing rope are not rated by MBS.

 

[Neeves]

I kind of assumed that was British humor. Perhaps wrongly.

I was out testing an ancient (maybe 15 years?) climbing rope's energy absorption capacity at the local crag today. I should probably retire it and start using the new one I bought. But I'm a cheapskate. It was just top roping--I wouldn't lead anything with it. By the time I'm done it will barely be suitable for rode or even snubber. Perhaps for my 1800-pound F-24, it would be OK. I guess that is where it will go next. It's nice and soft!

When I do retire it I will have to pull test a piece. I did 3-4 years ago and it was still about 90% strength. Hard to say, really, because climbing rope are not rated by MBS.

Wrongly actually.

The question was serious.

I was picking up on the idea that Bungee Rope is easy to splice? So define what is meant by bungee rope.

I have bungee cord 4mm - 10mm, that has a rubber core and a textile stretchy outer cover. The rubber core cannot be spliced. I've seen in chandlers mooring lines with eye splices at each end that has a rubber core - like my bungee cord (except mine is thin and these mooring lines must be around 15mm diameter). Why would you want to splice it, further.

Bungee cord for people who want to jump off bridges is too large a diameter to be used in any form on the size of yachts owner by the members here.

Retired climbing rope is almost impossible to splice - and why would you need to splice it? If you want retired climbing rope - there are lots of climbers who might want to retire their rope but don't want it going to land fill - ask at you local mountaineering/rock climbing club. Offer to make a contribution to their Xmas party, or donate some beer. You will need to convince them you are not going to use the rope in any height safety application - it might be difficult to explain to them what a snubber is - but give it a try


You can make a serious guess at the strength of a nylon rope - but not one that has been aged (aged because of UV? excessive use? many stretch cycles? over stressed?........)

New nylon's strength is largely a function of the amount of nylon, basically its weight (not volume). The strength of nylon is well documented - simply do the calculation and you will not be far out - how you use that information is upto the individual. The elasticity of nylon is part dependent on the method of manufacture but stretch characteristics of different nylon cordage, 3 ply, braided, kernmantle is also well documented.

In the application in which I am interested for nylon, snubbers - strength is not the big issue - if the rope stretches sufficiently it will not be particularly strong - but it will be 'stretchy'. If you use stronger nylon it will be insufficiently stretchy to 'snub'.

Jonathan

 

[simonfraser]

multiplait did not work on my lewmar gypsy

 

[Stemar]

My gypsy has a slot at the bottom of the chain gripper. It works fine on octoplait and laid line. It does sometimes have a problem with the splice, which makes that bit of chain bulkier and stiffer, but it isn't a real issue, as my anchor locker is shallow, and I have to be there to feed the rope away from the bottom of the windlass.