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Trust 5mm prusik
- Thread starter caleb1263
- Start date
on it's only 6.5 kn... hell no
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I hadn’t heard of the Jammy. I just looked it up and for $14.95 from REI, I think that’s the way to go.
Thank you.
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yeah man. if you fall even one foot from where you're at on the tree, you're generating at least 9-10 kn. so you'd already be snapping that cord you're talking about. The jammy is made to hold the kind of forces that you'd generate in a fall.
All things being equal. Yes I would agree, don’t use the 5mm that you showed
FYI Beal Cordelette - the same cordage the Jammy is made from - is available by the foot from EWO.
If you tie it into a loop and treat it like a double eye hitch cord, both eyes get clipped, then it’s 4x the break strength, 26 kN with the above cord, minus the loss from the knot and bend.
Wow, I did not know it was that much. That's going to hurt a little.
Make me think about the guys on the videos one sticking with 3 to 4 feet of slack in there tether.
I climbed MRS for over 10 years on 5mm accessory cord. But in MRS, or JRB, the friction hitch sees only half our weight. And the numbers worked out, because the weakest part of my system was > 15 times the load it sees. I don't like using 5mm cord for 100% of my body though. Its not just strength; its also surface area and ability to break under load. Soak your rope and hitch in a bucket of water overnight and then test it... i have.
What rope are u using that makes ya want 5mm instead of 6? I only use five mm on a 7 mm rope, or on an 8mm rope if the friction hitch is a Bachmann.
This vid shows my new favorite 5mm cord.
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What rope are u using that makes ya want 5mm instead of 6? I only use five mm on a 7 mm rope, or on an 8mm rope if the friction hitch is a Bachmann.
This vid shows my new favorite 5mm cord.
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I personally wouldn’t use 5mm with only a 6.5kN rating but all you guys saying heck no, how many of you are using kong duck or ropeman 1? Guess what your mechanical device has only been tested and rated to 4kN static pull so technically speaking this small weak 5mm tied prusik would still be stronger/safer than that mechanical rope grab.
Another great small diameter option is called titan cord from Bluewater ropes. It is 5.5mm, has over 3,000 lbs break strength, and it’s over 4000 lbs when made into a prusik loop. It also costs less than Beal Jammy cord does. Either cord would be plenty strong for a friction hitch
It’s not accurate. It depends on how far you fall, your weight, your fall factor (height above or below your connection point) and the amount of stretch in your tether, saddle ect… if you generate over 9kN of force in a fall, the most likely outcome is you’re permanently paralyzed or even deceased. On a 1:1 fall factor of less than 18”, most falls generate less than 900lbs of force which is the reason ANSI sets fall distance standards for work positioning harnesses.
Yes, i have used that Blue Water Titan cord. It's more like 5.5mm and stiff and less flexible than most cords. I believe it would outlast the Excel cord, but is a strong and respectable option. Again, I only use 5mm on one side of a doubled rope system.... wanting 6mm cord on 8mm rope as a minimum on any single rope system.
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what site is this from?
i only trust climbing/arborist sites (well known) or big outdoors places that sell a lot of climbing stuff (rei.com etc).....i don't trust sites where anyone can sell (amazon or ebay) because you'll eventually buy a knockoff chinese carabiner only suitable for keychain use
Math anyone?
6.5 kn is almost 1500 lbs.
If its loaded on 2 strands, that's 3000lb.
But if it is in any kind of loop, tied with a bend, we have to reduce its strength, as a bend is always significantly weaker than the cord. I conservatively assume a knot is only 50% efficient and that takes the entire assembly back to 1500 lb.
My goal for my own life safety is a minimum of 3000lb: 15x the load ( my 200lb butt).
Yes i realize the friction hitch will slip at a lower load, and that's ok. I want all static parts to hit the 15x number. 10x is arguably ok, as that is the old school number, but this cord doesn't even hit that. Excel Racing Dinghy Control Line does. Specs:
Polyester over Dyneema
16-Plait Polyester over 12-Strand Dyneema
5MM - 3,152lbs.
6MM - 4,541lbs
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6.5 kn is almost 1500 lbs.
If its loaded on 2 strands, that's 3000lb.
But if it is in any kind of loop, tied with a bend, we have to reduce its strength, as a bend is always significantly weaker than the cord. I conservatively assume a knot is only 50% efficient and that takes the entire assembly back to 1500 lb.
My goal for my own life safety is a minimum of 3000lb: 15x the load ( my 200lb butt).
Yes i realize the friction hitch will slip at a lower load, and that's ok. I want all static parts to hit the 15x number. 10x is arguably ok, as that is the old school number, but this cord doesn't even hit that. Excel Racing Dinghy Control Line does. Specs:
Polyester over Dyneema
16-Plait Polyester over 12-Strand Dyneema
5MM - 3,152lbs.
6MM - 4,541lbs
Sent from my SM-G975U using Tapatalk