Originally Posted by canyoncaver
First of all, thanks to the OP for sharing so that others can learn. Also, very glad to hear that you survived what must have been a terrifying incident.
Unfortunately the analysis of this incident is leading some of you into incorrect and very unfortunate conclusions. This incident is not the result of skinny rope, biner blocks, single strand, or lack of belay. This incident is an out-of-control rappel that resulted from an inappropriate descender. The ATC was plain and simple not able to provide enough friction.
Someone can correct me if they think I'm wrong, but the ATC was never meant for this type of rappelling. I do not understand how anyone could think it appropriate to rappel an ATC single-strand on 8 or even 9mm free-hanging rope.
There are many devices that would be more appropriate including rappel rack, bobbin, SRTE, figure eight...hell, even a munter hitch would provide more friction. ATC seems like a bottom of the barrel choice for this application.
I think Brian should amend his mantra to read "single-strand, biner-blocked, skinny rope is not appropriate...WHEN USING AN ATC" Biner-blocked skinny rope is fine and dandy when you and your rappel device can handle it.
Bottom belays and autoblocks are not the answer. They are band-aid measures that must be applied when people insist on using tube devices on single rope.