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Old 05-01-2015, 07:56   #46
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Re: Synthetic Rigging

I ran across this knotless line connector which I thought was sort of interesting. It's intended use is for with braided Spectra fishing line. It's fast and stupid simple to use and if a fish can't shake it I am thinking it's pretty secure.

I made a larger version out of 1/4" mild steel which I have paired with 1/8" Dyneema which I am planning on testing to breaking to see if it slips, which it is not supposed to do. I should have the capability to break the line but have no way of measuring what the load is.

If it doesn't slip I will go up in size and wonder if anyone out there has the equipment required to pull test, who also wouldn't mind trying to break some samples I would send them?

I figure there are several potential applications, a standing rigging terminal being one of them. The advantage being no splice so can be made quickly with little skill while also being adjustable.

Cheers



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Old 12-01-2015, 13:12   #47
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Re: Synthetic Rigging

Well folks. Nice to read this thread since I will be replacing the backstay and the babystay of my Beneteau 361 with Dyneema for the coming season. I've done quite some research on the subject an have come to the following conclusions:

There are different types of Dyneema. The common Sk75 and the new DM20. SK75 has a significant ammount of creep which ends the life of a line under permanent load fairly quickly. The newest development is DM20 which has virtually no creep. This is the stuff for shrouds and stays.

The Colligo Hardware is absolutely ridiculously expensive and I decided to stay away from them. I am going to use these closed stainless thimbles as pictured before which are available here in Germany very cheaply for a couple of euros each.

Another thing to consider is stretch. 1X19 has a stretch of 1% at breaking load. Dyneema comes out at about 3.5%. For stays this would be acceptable for shrouds probably not. To coma out at the same stretch values Dyneema needs to be about three times stronger than 1X19 which means you need to unse thicker lines. Then windage becomes an issue to consider.
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Old 12-01-2015, 16:34   #48
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Re: Synthetic Rigging

Quote:
Originally Posted by 40 South View Post
D1's were 3/8" 1x19 S/S wire. I went to 11mm Dux as a replacement. The Dux is fairly chunky (22mm) at the splice, but you only notice the lower ends. Once they are all done I don't think it will be noticeable as there will not be S/S wire to compare to. The D1's are my largest stays (except for the forestay which is also 3/8'' but you can't see that under the furler & foil). The rest range from 5/16" down to 1/4" so the Dux will not look much different at those sizes.



14mm would probably be changed out for 15mm Dux. (Please seek professional advice, this is just my opinion). The final diameter of this size Dux (at the splice) would be about 30mm with just over a meter bury. The taper would start at around 500mm into the bury.



Thanks




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Old 20-03-2015, 17:43   #49
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Re: Synthetic Rigging

Hi all, just a quick update on the Dux rigging……..

I have only managed to get out sailing twice since I installed the Dux. Work getting in the way of fun!!

The first sail I re-tensioned the Dux rigging so that the stay was just unloaded on the leeward side in 20-25 knots.

The second sail required no re-tensioning, again in 20-25 knots.

Dux appears to be very suitable for cruising boats, easy to work and replace, up to the task and cost competitive.

I hope to replace the remaining stays over this winter. I will keep updating as the project unfolds.
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Old 22-08-2015, 15:56   #50
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Re: Synthetic Rigging

Hi,
i'm just curious to know if anybody used already DM20 for standing rigging?
DM20 aka DynIce-Perma or Dynastay or....?
Looking for empirical informations about this new rope.
thanks: Maia
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Old 22-08-2015, 18:30   #51
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Re: Synthetic Rigging

Quote:
Originally Posted by Maia View Post
Hi,
i'm just curious to know if anybody used already DM20 for standing rigging?
DM20 aka DynIce-Perma or Dynastay or....?
Looking for empirical informations about this new rope.
thanks: Maia
I haven't but from what I have read it looks like a designed replacement for Dux in rigging. Lower creep, higher strength, less stretch. I would be very interested in hearing what John Franta has to say about it.
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Old 23-08-2015, 14:07   #52
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Re: Synthetic Rigging

Cheorae has 20 ton Kevlar shrouds with duplex St. steel fittings pre made by BSI. 20 mm size.
We used Kevlar 9 ton for the runners 11 mm size. Connected to NER STS 12-78
Dyneema.
We carry a spare 100 ft of 15 mm dyneema as an emergency shroud.

All are attached to mast fitting with Dyneema loops . I can't find the specs for the loop right now but they were pull tested by nance and underwood and failed at 57,000 lbs
The lashings were all done with 1/4" Amsteel
Regards
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Old 25-08-2015, 07:55   #53
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Re: Synthetic Rigging

Quote:
Originally Posted by Stumble View Post
I haven't but from what I have read it looks like a designed replacement for Dux in rigging. Lower creep, higher strength, less stretch. I would be very interested in hearing what John Franta has to say about it.
Here is Franta's response about DM20 relayed through my rigger: "He could use this but his rig would be bouncing all over the place as it stretches alot more than Dux. All of the new chemistries of Dyneema do not heat stretch as all as SK75. We have tested them all. So the constructional stretch in them is too much to use for standing rigging. This is why Hampidjan still uses SK75 for their heat stretch products."
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Old 25-08-2015, 07:56   #54
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Re: Synthetic Rigging

Quote:
Originally Posted by Steel sails View Post
Cheorae has 20 ton Kevlar shrouds with duplex St. steel fittings pre made by BSI. 20 mm size.
We used Kevlar 9 ton for the runners 11 mm size. Connected to NER STS 12-78
Dyneema.
We carry a spare 100 ft of 15 mm dyneema as an emergency shroud.

All are attached to mast fitting with Dyneema loops . I can't find the specs for the loop right now but they were pull tested by nance and underwood and failed at 57,000 lbs
The lashings were all done with 1/4" Amsteel
Regards
Paul
This is interesting. Some pics would be great.
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Old 25-08-2015, 13:05   #55
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Re: Synthetic Rigging

Quote:
Originally Posted by SVNeko View Post
Here is Franta's response about DM20 relayed through my rigger: "He could use this but his rig would be bouncing all over the place as it stretches alot more than Dux. All of the new chemistries of Dyneema do not heat stretch as all as SK75. We have tested them all. So the constructional stretch in them is too much to use for standing rigging. This is why Hampidjan still uses SK75 for their heat stretch products."
Stupid engineering... solve the creep problem and introduce stretch. Oh well...

So Dux is still is for standing rigging, Dyneema for running.
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Old 26-08-2015, 08:59   #56
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Re: Synthetic Rigging

the loop is through the mast fitting

regards
paul
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Old 18-07-2016, 05:21   #57
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Re: Synthetic Rigging

Any updates on how the dux rigging is working out? I am still toying with giving it a go. Saw a neat job on a traditional yacht today that got me back thinking about it.



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Old 18-07-2016, 05:54   #58
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Re: Synthetic Rigging

We're really rigging with dux in August. Worked with John at Colligo, super nice and very knowledgeable, and has been a fairly easy process. I'll update when I start the process.

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Old 18-07-2016, 15:37   #59
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Re: Synthetic Rigging

Quote:
Originally Posted by Snowpetrel View Post
Any updates on how the dux rigging is working out? I am still toying with giving it a go. Saw a neat job on a traditional yacht today that got me back thinking about it.
Hi Snowpetrel

Funny you should mention it….. I have just completed a full re-rig (except forestay - furler fitted) in Dynice Dux. I will post some photos of the rig standing in the next few weeks when I get up there to look at it standing, In the meantime here a a few shot off the rig on the ground and some of the work I have done.

The two D1's I did 18 months ago are performing great, no adjustment required after initial setup.
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Old 18-07-2016, 17:04   #60
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Re: Synthetic Rigging

Very professional work 40 south, looks great. Thanks

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