Tech Tip: Question stone knot with dynamic rope

hello. sent here from r/canyoneering, a beginner w 6 canyons under my belt.

basically, are there any issues to consider when using a stone knot, smooth operator and a dynamic rope to rap about 200 feet? i was concerned w safety of a dynamic rope stretched to almost full capacity and how it may effect a stone knot and a smooth operator, could it somehow slip through for the last person? or could it cinch down and become unreleasable?

scenario: got lost on an approach to a climb but i had my 200 ft pull cord, webbing, and smooth operator in my pack. we only had our 70 m climbing rope. i could see the trail we had to be on but we were about 200 feet up on a cliff and rather than back track i considered rapping down the cliff but didn’t know how that might work with a non static rope.

any input is appreciated!

I would have a slight concern about the knot over-tightening if using a floppy climbing rope. Especially if wet. But only slight. At rappelling loads, the difference at the stone knot of a static rope and a climbing rope are pretty small.

That is a definite "probably not".

Tom

I agree with Tom and with what the over on Reddit are saying. There's probably a low likelihood of over tightening the stone knot and sticking the rope, but if I had to get down and all I had was a dynamic rope I would do it.

But in a canyoneering context you should just get a real canyon rope and not worry about it. In your specific case (where you have stated you have webbing), could you just use the webbing to put in a conventional (ie non-releasable) anchor and use the pull cord to retrieve your rap rope? Was there a specific anchor challenge that made you want to fiddlestick it?

Agreed on getting a legit static rope.
Can't recommend enough ropes with aramid sheaths for canyoning.

I know I know I know they are 2-4x the cost, but, you only buy it once.

I have a BWCE with around 75 descents on it, and we've abused the hell out of it... still perfect speed and nowhere near a coreshot; I can't say that for any other rope I've ever owned with a poly/nylon sheath.

Used to avoid posting this recc on this forum, as Tom didn't have one on offer, and didn't feel right pointing folks elsewhere; but that is no longer the case, now that he sells the Slyther.
Imlay Slyther 8.1 Tech Rope (canyoneeringusa.com)

Christmas is coming up; be generous to yourself and buy aramid!

I'll believe that when I see it. I don't have any piece of canyoneering gear that I've only bought once.

Body bag?

Varies drastically with the type of canyons that you are playing in

Do your partners know you consider this part of your canyoneering gear?

Fair.