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8mm Oplux questions & uses
- Thread starter Tapeworm
- Start date
Buckshot1822
Active Member
I would buy several of them also, I have been looking for a while. It would be ideal if it was the jammy cordage.
Here it is.
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On Sep 27, 2019, at 4:30 AM, Julien Thourigny <julienthourigny@beal-planet.com> wrote:
Sorry for delay
I don’t any problem on the configuration
You could use also accessory core aramid 5.5 mm instead of jammy
The resistance of the cord is 1850 kg without knot (with 8 knots - 40%)
Just be carefull at the knots at extremities (sliding)
Sportily
Cordialement/Best Regards
Julien THOURIGNY
Beal
2 rue Rabelais
38200 VIENNE
Tél :0474788888
Fax:0474852776
----------------------
De :
Envoyé : jeudi 26 septembre 2019 12:18
À : Julien Thourigny
Objet : Re: Questions on jammy
Hi Julien,
I want to use sterling oplux 8mm with a beal jammy (sewn end cut off) and jammy cord attached to oplux with a distel hitch and distel attached to locking carabiner. The below link described the distel.
I want to use it to tether to a tree. Arborists and deer hunters who hunt from trees use this configuration to safely tether to trees.
Currently I use bluewater assault 11 mm with armor-prus 8mm for distel with an autolocking carabiner to tether to trees. I would like to use the same configuration with oplux 8mm and jammy. Having tried it at ground level, it works for me.
I just want to ensure that using a distel hitch would not substantially weaken the jammy cordage.
Image of what I have that may be illustrative.
<message_image.png>
Image of my cordage from one of the beal jammy threads.
Thanks and kind regards,
1850 kg is 18.14 kN
Not sure if he meant minus 40% or at 40 %
@ 40% = 0.4 * 18.14 == 7.256 kN == 1,631 lbf
Less 40% = 18.14 - (0.4 * 18.14) == 10.884 kN == 2,446 lbs
Someone please check my math.
Additionally, he cautions about tail length.
And I am not sure how he came up with 8 knots.
My guess is 5 loops for distel, 1 for each poachers and an additional one for “safety”.
With this information and his reply, what are your thoughts?
Not sure if he meant minus 40% or at 40 %
@ 40% = 0.4 * 18.14 == 7.256 kN == 1,631 lbf
Less 40% = 18.14 - (0.4 * 18.14) == 10.884 kN == 2,446 lbs
Someone please check my math.
Additionally, he cautions about tail length.
And I am not sure how he came up with 8 knots.
My guess is 5 loops for distel, 1 for each poachers and an additional one for “safety”.
With this information and his reply, what are your thoughts?
Thanks for puttin in the work. I am assuming you will continue to run the oplux with beal jammy as a distel hitch on your tether?
Edit I posted as you posted the math. With that math, it doesnt seem in safe spec. I will probably return my 3 beals, skip opening weekend and try to find something safe. Thanks for the information.
Sent from my iPhone using Tapatalk
Edit I posted as you posted the math. With that math, it doesnt seem in safe spec. I will probably return my 3 beals, skip opening weekend and try to find something safe. Thanks for the information.
Sent from my iPhone using Tapatalk
Or figure 8s?
If that's not acceptable to you, you probably need to move up to big arborist ropes. also consider adding a ripstop like @kyler1945 this is a rare case where the rope company was willing uo say "this is ok" Remember a distel has 2 tails. You can do a triple rather than double noose to further guard against knot slippage.
The "less 40%" values align with their published specs for the 5.5 cord knotted in a loop, so is almost certainly the correct one.
2/3 the weight of htp!FYI fifty feet is less than 1.5 pounds
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Maybe.
Looking at the data sheet for Beal cordage
https://sport.beal-planet.com/index.php?id_product=1421&controller=product&id_lang=1
I see 5.5mm is 1800, slightly less than 1850 he quoted for jammy (at least that is how I read it).
Jammy shows 2200 for breaking strength on packaging (22kN). Looks like the jammy is stronger than he quoted.
So, with his response, how do you feel about using Jammy?
My initial thoughts are that it will be just as fine as armor-prus as both have same initial kN strength. And I would be using it in same configuration (distel). That said, I can be swayed with knowledgeable input.
My 8mm armor-prus has higher break strength
https://www.donaghys.com.au/file_uploads/fact-sheets/Armor_Prus_Range_Fact_Sheet_May2019.pdf
27.47kN, at this point, it is higher than carabiner strength.
I am still debating what to do. Part of me says stay with blue water assault and armor-prus. Another part says the oplux/jammy is so light and compact and the company said it is OK for our use.
Gah! What to do.
Last edited:
Also https://sport.beal-planet.com/download/0e9d37691e856d83c191a19943945fdc.png for ease of viewing. Note the recommeded triple fisherman's and 20kn knotted loop strength. Likely wise to do the same attaching to the carabiner.
If anyone is not comfortable with the oplux, and wants to move to something else to ensure full life-support ratings - I'd be happy to offer up in trade s set of unused tethrd ropes. I suspect that the beal cord is about as good as it gets for friction hitches on small diameter rope, and to avoid these drawbacks you need to go to a larger rope with more traditional fibers.
What I've seen is at least within my personal comfort level.
If anyone is not comfortable with the oplux, and wants to move to something else to ensure full life-support ratings - I'd be happy to offer up in trade s set of unused tethrd ropes. I suspect that the beal cord is about as good as it gets for friction hitches on small diameter rope, and to avoid these drawbacks you need to go to a larger rope with more traditional fibers.
What I've seen is at least within my personal comfort level.
Link is easier to use then one I shared.
I am still up in the air about what I will do with my setup (except that I will add another loop to my poacher/scaffold knots).
Thanks for all the good content on this thread.
Yeah their site is not great. And all the info on the 5.5 aramid page is for the wrong rope!Link is easier to use then one I shared.
I am still up in the air about what I will do with my setup (except that I will add another loop to my poacher/scaffold knots).
Thanks for all the good content on this thread.
This has served as a good reminder to consider knot strength when working with more "tech" ropes. I know I learned a lot digging in to a lot of independent test data on this and other rope/device safety topics the last couple of days.
pesqimon
Well-Known Member
Seems that way. The catalog shows an aramid 5.5 cord that is apparently OK for "self-locking knots" but then there doesn't seem to be a page for it. The 5.5s that do show up warn against "self-locking knots" ie poachers knot for finishing the distel.
The 5.5 aramid page is showing the info for dyneema cords.
smcchevy
Well-Known Member
Has anyone looked at the Sterling Aztec ratchets? Wouldn't they be suitable for Oplux friction hitches?
They should work fine if you're ok with 12.5 kn. That's "personal comfort for my application" not "life support rated"