Moderator: Tim White
hank_moon wrote:<b>Petzl Vector:</b> polyester/nylon fusion; 11 mm and larger only
Relatively bouncy, slightly thinner sheath than others (PMI, BW) so not as good for caving.
RescueMan wrote:Speaking of thinner sheaths. What do you, Hank, and others think about Sterling's claim that their very supple (and thin) 48-carrier sheath is actually MORE durable because each individual fiber is exposed less on the surface?
And, while we're at it, what do y'all think about their claim that their proprietary DryCore is more resistant to saturation than other ropes?
but mine is because of the smoother (less bumpy) sheath, there is more surface contact with the rack bars creating more friction/heat
I don't think basic Physics allows this to work because as you rappel a certain distance, say 100ft, you will always dissipate the same amount of energy (assuming you don't hit really hard or change weight). What really changes is how the energy (heat) is dissipated.
David_Campen wrote:I don't think basic Physics allows this to work because as you rappel a certain distance, say 100ft, you will always dissipate the same amount of energy (assuming you don't hit really hard or change weight). What really changes is how the energy (heat) is dissipated.
Exactly, if a 150 lb person rappels 500 ft and does not crater into the ground then a specific amount of energy has to be converted to heat. This does not vary according to rope or descender.
Even if one's stomach can deal with the bounce, a whole lot of your climbing energy is going into that bounce. I have heard from several who do use frogs (I use a ropewalker) that they would never climb more than 200' of BW.
I bring this up because I was once stuck at the bottom of Fantastic Pit for 14 of the most miserable hrs of my life, while first 2 (tandem), than 1 caver, tried to climb the 600 ft of BW with frogs. The top one got sick from all the bounce when only 30 ft off the ground. The lower one was only 20 ft off the ground, when I heard their pleas for help. Neither knew how to down climb,
David_Campen wrote:Exactly, if a 150 lb person rappels 500 ft and does not crater into the ground then a specific amount of energy has to be converted to heat. This does not vary according to rope or descender.
David_Campen wrote:
Exactly, if a 150 lb person rappels 500 ft and does not crater into the ground then a specific amount of energy has to be converted to heat. This does not vary according to rope or descender.
I ain't no expert either. But I don't think it's that simple. How about this...
David_Campen wrote:Definitely sounds like a problem of lack of experience not equipment.
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