Hope I did not make thing more confusing to follow.
Please read George's comments and Stelios' question and respond here.
George Dasher wrote:I defined a QAS as a safety jumar or ascender, and they are just as important on way down as the way up. Maybe more important on the way down.
And I too am citing Kyle Isenhart as the originator of the statement.
But I stand by my words.
On the downhill: There are bad lips where you need the ascender, I've had my own rack bend on a bad lip, and I've seen very experienced vertical cavers take their hands off the rope to point out possible survey stations (I didn't know talking with your hands was that ingrained of a habit!). You REALLY REALLY need that ascender on the rappel. It is THE mark of a competent vertical caver, and it is even more important when you're rappelling into a pit no one (or few people) have done before.
Now I guess you could argue the point on the uphill. A Texas System has only two ascenders and you don't really need a third. A Ropewalker (Simmons Roller) system doesn't need that extra ascender, but both the Ropewalker and the Texas have that safety ascenders build in. A Frog? Sometimes I carry an extra ascender and sometimes I don't. It depends on how nasty the cave is. And I don't have enough experience with a Mitchell to comment.
And what about crossing re-belays and re-directs?
A helmet, scuffed up toes, and the safety ascender. These are the first things I look for with someone I don't know when doing vertical work. That and dirty, well-used equipment.
A light is only needed for underground work. It is not critical for all vertical work.
George Dasher wrote:"Whit" Whitamore had the rope sheath come loose from the core and start to slide down the rope while at the top of Golondrinas in the 1970s.
What would you do then without a safety ascender?
Stelios Zacharias wrote:George Dasher wrote:On the downhill: There are bad lips where you need the ascender, I've had my own rack bend on a bad lip, and I've seen very experienced vertical cavers take their hands off the rope to point out possible survey stations (I didn't know talking with your hands was that ingrained of a habit!). You REALLY REALLY need that ascender on the rappel. It is THE mark of a competent vertical caver, and it is even more important when you're rappelling into a pit no one (or few people) have done before.
I had never heard the term QAS before joining this BBS.
Could you clarify for someone without too much experience who has been taught only "frog" system: why was the rope rigged in a way that it was so close to the lip that your rack bent on the lip? It sounds crazy to me. Why would you need to attach an ascender to the rope so as to point things out. Why isn't locking-off the descender enough? Do you rappel with an ascender attached to the rope in two foot sections, sliding the ascender down, rappelling a little more, sliding it down again? I cannot visualise why an ascender would be useful when rappelling.
Is the American SRT so different to European practice?