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Screamer in a bridge?

Marmuzz

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Trying to think this through… is the advantage of a dynamic friction hitch cord that it will also provide some elongation and shock absorption? It seems to me I’d rather not have any budge at all in the knot holding me to the lifeline, and would rather have it bite down hard on the tether so that it can then cause the much stronger dynamic ability of the tether to bear the stress of a fall.
 

Fl Canopy Stalker

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Trying to think this through… is the advantage of a dynamic friction hitch cord that it will also provide some elongation and shock absorption? It seems to me I’d rather not have any budge at all in the knot holding me to the lifeline, and would rather have it bite down hard on the tether so that it can then cause the much stronger dynamic ability of the tether to bear the stress of a fall.
It is to add extra elongation to your system in the event of a fall. Typically when a fall generates enough force, a static hitch on a static rope will slip before it fails. With a dynamic hitch cord, it is more likely the extra stretch will further reduce force while simultaneously gripping tighter since both the cord and the rope are stretching at the same ratio. Remember dynamic ropes are not rated for break strengths, they are rated for number of falls they can sustain before failure
 

Fl Canopy Stalker

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Trying to think this through… is the advantage of a dynamic friction hitch cord that it will also provide some elongation and shock absorption? It seems to me I’d rather not have any budge at all in the knot holding me to the lifeline, and would rather have it bite down hard on the tether so that it can then cause the much stronger dynamic ability of the tether to bear the stress of a fall.
But to be very clear either one would work
 

CooterBrown

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Dont I need an eye to eye to tie these. All I can find is a loop without having to buy a length and tie my own eye to eye
 

_Dario

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The other thing I want to say about this is I will absolutely use a dynamic rope over a static one but you will find, the way we are using them, the stretch at these lengths of rope is not as robust as when you are using them as intended on a climbing wall.

I have 40’ of the beal rope and 2x 11’ tethers left to play around with. I can definitely feel the rope bounce if I jump my weight into the tether but it’s not terribly substantial. I rappelled down on the 40’ section and by the time my feet were about to hit the ground, I really felt that rope bouncing. It’s awesome - it completely takes any harshness out of the rappel if you stop suddenly. But when you are at the top of the rappel with only 4-5 feet of line out, the bounce is not as substantial.

so just setting expectations, this will be an improvement over static line but don’t consider this a pass to fall into it off your stick.

Even though the dynamic is bouncier, both falls could injure/kill you. One will just be bouncier.
 

Fl Canopy Stalker

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Dont I need an eye to eye to tie these. All I can find is a loop without having to buy a length and tie my own eye to eye
Ok I am not familiar with Michoacán hitch (spell check) off the top of my head I know that sterling, rock and rescue, and Bluewater ropes all have 8mm presewn eye to eyes cords, I am not sure how great they would grip though because it’s too close in size. Off the top of my head, Only Bluewater has presewn eye to eye cord in 7mm…other options would be to maybe use a longer sewn loop and a klemheist (again spell check?) since it releases easier than a traditional prusik? Again just off the top of my head. I’m sure there are other cords available. Perhaps others who use the fancier hitches will chime in on ideas?
 

Marmuzz

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@_Dario that is great input. So frankly, in your opinion (which I know is an opinion and not official testing), for use as a tether is dynamic even a worthwhile investment over static line then, given how short a leash saddle hunters are using? (Thinking particularly of one sticking. At most it’s what, 5-6 feet in your tether while ascending? That pales compared to the multiple tens of foot length these ropes are intended to be used for in climbing.) No offense- I’m not trying to make light of the concerns and threads on this as of late. I know you’ve really been on some good safety discussions recently and have pursued dynamic line but honestly your last statement there makes it not sound like a pragmatic tool. But I’ve not used dynamic line myself.
 

Fl Canopy Stalker

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@_Dario that is great input. So frankly, in your opinion (which I know is an opinion and not official testing), for use as a tether is dynamic even a worthwhile investment over static line then, given how short a leash saddle hunters are using? (Thinking particularly of one sticking. At most it’s what, 5-6 feet in your tether while ascending? That pales compared to the multiple tens of foot length these ropes are intended to be used for in climbing.) No offense- I’m not trying to make light of the concerns and threads on this as of late. I know you’ve really been on some good safety discussions recently and have pursued dynamic line but honestly your last statement there makes it not sound like a pragmatic tool. But I’ve not used dynamic line myself.
I can’t answer for Dario, only for myself but I do not use a true dynamic line for SRT or for my tether. I use low elongation rope for each. Less stretch than dynamic, but more than static. It’s not because dynamic doesn’t work in that instance, it’s because I don’t like the spongy feeling of dynamic ropes…. Using dynamic on a tether will absolutely make a difference in a fall versus static rope. Because it’s going to stretch 10x the amount of a static rope. Any time we sustain a fall, that stretch will reduce force but it will not be like falling 20’ on a wall line. Nothing (screamers, dynamic, static, whatever) makes falling on a work positioning harness “safe”. That is why I always say administrative controls are the best controls we currently have available.
 
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