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jt512


Apr 26, 2010, 2:22 AM
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Re: [potreroed] Climbing gym disaster [In reply to]
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potreroed wrote:
The belayer in the original post was using a reverso; Gail's belayer was using an atc; both accidents could have been avoided had the belayers been using a gri-gri or a cinch.

For every accident caused by misuse of a conventional belay device, there's an accident caused by misuse of a Grigri. Could that mean Cinches are the answer, or are they just less popular?

Jay


jt512


Apr 26, 2010, 2:50 AM
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Re: [jmeizis] Climbing gym disaster [In reply to]
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jmeizis wrote:
If there's never ambiguity about what the belayer's job is when you're climbing, why does that stop when you get to the anchor?

I've already explained why that is when you're cleaning, which, for some reason, is what I was fixating on.

In reply to:
If you're in fear of regular partners dropping you at the anchor then I don't know how you can take falls with them.

I have already explained the justification for grabbing the rope after cleaning the anchors before lowering. No one, including you, has given a valid justification for not doing so.

In reply to:
Besides that if your partner is using the gri-gri the way they should be then it will lock before they lower you.

I'm not quite sure that that is true, but even if it is, that is no reason to not take the precaution of ensuring that your belayer does in fact have you on tension.

In reply to:
Even if it didn't they should still be able to hold you at the anchor and lower you without incident.

Well, that is clearly false. If you sag onto the rope, the grigri can fail to lock, and if the rope starts to run through the device it is not at all clear whether the belayer can always get it to stop.

In reply to:
I can think of no situation where a miscommunication could result in getting dropped to the ground unless the route is ten feet tall or your belayer incompetently lets go of the rope.

There is a difference between not being able to think of something that can go wrong, and there not being anything that can go wrong. This very thread was about something that went wrong that apparently you couldn't have thought of. Every accident involving a belayer with a burned brake hand occurred on a route taller than 10 feet with the belayer holding the rope.

In reply to:
Both are ridiculous situations that shouldn't happen.

More famous last words.

In reply to:
I'm assuming you lower through the anchors by passing a bight through and tying into at the bight before untying from the other end.

Bad assumption. I can't remember the last time I saw an anchor where that would be possible.

In reply to:
Part of taking responsibility for your and other people's safety is not lowering through the anchors. Unless you're planning to fork up the cash to repair them.

Even ignoring the fact that that statement has nothing to do with this thread it is bullshit. At every crag I climb at, it is expected that the last person on the route will lower through the anchors, and at the majority of crags I climb at it is perfectly acceptable for all leaders, and sometimes topropers, to lower through the anchors.

Jay


gblauer
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Apr 26, 2010, 3:11 AM
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Re: [jt512] Climbing gym disaster [In reply to]
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In my case, I had just finished leading my climb. The last bolt was at my waist and I told my belayer that I was going to "pop off" the wall. I asked her if she was ready, she said "yes", I said "you got me" and she said "yes". (Something like that exchange...maybe not those exact words). We had eye contact, we had a distinct verbal exchange. I let go and she let me run through her ATC. I heard her say "uh oh, I don't have her". My belayer did not have any burns on her hands and she was in the gym climbing the next day. She has NO idea what happened and there was not a witness who could begin to explain her actions.

That said, I had a nagging little voice in my head during my verbal exchange with my belayer...it said something like "she is too far away from the wall". I let go anyway and hit the deck.

While it was extremely unpleasant, it did open up my eyes. I minimized my group of belayers, I was no longer the guinea pig to take falls for new belayers and I learned how to lead belay with a gri gri.

I watch others belay and I walk away when I see poor form, inattention, bad technique. I don't want to see any one else hit the deck.


coolcat83


Apr 26, 2010, 3:35 AM
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Re: [jt512] Climbing gym disaster [In reply to]
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jt512 wrote:
potreroed wrote:
The belayer in the original post was using a reverso; Gail's belayer was using an atc; both accidents could have been avoided had the belayers been using a gri-gri or a cinch.

For every accident caused by misuse of a conventional belay device, there's an accident caused by misuse of a Grigri. Could that mean Cinches are the answer, or are they just less popular?

Jay
+1 for the cinch


bennydh


Apr 26, 2010, 3:57 AM
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Re: [coolcat83] Climbing gym disaster [In reply to]
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coolcat83 wrote:
jt512 wrote:
potreroed wrote:
The belayer in the original post was using a reverso; Gail's belayer was using an atc; both accidents could have been avoided had the belayers been using a gri-gri or a cinch.

For every accident caused by misuse of a conventional belay device, there's an accident caused by misuse of a Grigri. Could that mean Cinches are the answer, or are they just less popular?

Jay
+1 for the cinch

-1 for devices designed to take away the active responsibility of belaying from the belayer.

+1 for properly using any belay device.

On the topic of lowering off sport anchors, its the standard at any SoCal crag that I can think of.


jmeizis


Apr 26, 2010, 4:01 AM
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Re: [jt512] Climbing gym disaster [In reply to]
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In reply to:
I've already explained why that is when you're cleaning, which, for some reason, is what I was fixating on.
If you would rappel instead of lowering then you wouldn't have to rely on your belayer and people wouldn't need to replace anchor chains/rings as often.

In reply to:
I have already explained the justification for grabbing the rope after cleaning the anchors before lowering. No one, including you, has given a valid justification for not doing so.
There is no valid justification not to do so, hell do whatever you like. I guess I don't see why you would worry about them dropping you when you clean the anchor anymore than you would if you just climbed up and lowered as if doing a toprope. Assuming of course you have confidence that your belayer knows what they're doing. Although the problem could be completely alleviated if you rappeled instead of lowered through the anchors.

In reply to:
Well, that is clearly false. If you sag onto the rope, the grigri can fail to lock, and if the rope starts to run through the device it is not at all clear whether the belayer can always get it to stop.
Sorry, I should have predicated that by saying your belayer should know how the hell to use the device. If the belayer is controlling the brake strand then they should be able to bring you down even if for some reason the device failed to lock.

In reply to:
There is a difference between not being able to think of something that can go wrong, and there not being anything that can go wrong. This very thread was about something that went wrong that apparently you couldn't have thought of. Every accident involving a belayer with a burned brake hand occurred on a route taller than 10 feet with the belayer holding the rope.
I could have thought that my belayer might be an idiot and therefore I should just rappel or self lower.

In reply to:
Even ignoring the fact that that statement has nothing to do with this thread it is bullshit. At every crag I climb at, it is expected that the last person on the route will lower through the anchors, and at the majority of crags I climb at it is perfectly acceptable for all leaders, and sometimes topropers, to lower through the anchors.
I think I've shown that the statement has at least a little to do with the thread. Your crags must have some really rich and nice first ascencionists because I have never climbed at a crag where it was acceptable to toprope through the anchors and many crags I've been to it's not acceptable to lower through the anchors. I'd be more worried about inspecting those quicklinks you're lowering off of than whether your belayer is going to drop you. Why the hell would you gumbies wear out the anchor equipment so someone has to replace it more frequently than they otherwise would if everyone rappeled?


jt512


Apr 26, 2010, 4:27 AM
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Re: [jmeizis] Climbing gym disaster [In reply to]
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jmeizis wrote:
In reply to:
I've already explained why that is when you're cleaning, which, for some reason, is what I was fixating on.
If you would rappel instead of lowering then you wouldn't have to rely on your belayer...

Well, if I would just solo everything, I wouldn't have to rely on my belayer, either. I'm convinced that rappelling is more dangerous than lowering, especially on steep, or traversing routes; and it is certainly less convenient.

In reply to:
...and people wouldn't need to replace anchor chains/rings as often.

Everybody I know who replaces anchors would rather have people lower off their anchors than rappel, even though it means they have to replace the anchors more often.

In reply to:
In reply to:
I have already explained the justification for grabbing the rope after cleaning the anchors before lowering. No one, including you, has given a valid justification for not doing so.
There is no valid justification not to do so, hell do whatever you like. I guess I don't see why you would worry about them dropping you when you clean the anchor anymore than you would if you just climbed up and lowered as if doing a toprope.

I've already explained what the difference is.

In reply to:
In reply to:
Well, that is clearly false. If you sag onto the rope, the grigri can fail to lock, and if the rope starts to run through the device it is not at all clear whether the belayer can always get it to stop.
Sorry, I should have predicated that by saying your belayer should know how the hell to use the device. If the belayer is controlling the brake strand then they should be able to bring you down even if for some reason the device failed to lock.

Nope, I disagree. A strong belayer wearing gloves might be able to do that. Certainly not every belayer could. An unlocked grigri does not behave like an ATC.

In reply to:
In reply to:
Even ignoring the fact that that statement has nothing to do with this thread it is bullshit. At every crag I climb at, it is expected that the last person on the route will lower through the anchors, and at the majority of crags I climb at it is perfectly acceptable for all leaders, and sometimes topropers, to lower through the anchors.
I think I've shown that the statement has at least a little to do with the thread. Your crags must have some really rich and nice first ascencionists because I have never climbed at a crag where it was acceptable to toprope through the anchors and many crags I've been to it's not acceptable to lower through the anchors. I'd be more worried about inspecting those quicklinks you're lowering off of than whether your belayer is going to drop you. Why the hell would you gumbies wear out the anchor equipment so someone has to replace it more frequently than they otherwise would if everyone rappeled?

Because we "gumbies" know what the anchors are for.

Jay


(This post was edited by jt512 on Apr 26, 2010, 4:55 AM)


jt512


Apr 26, 2010, 5:00 AM
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Re: [gblauer] Climbing gym disaster [In reply to]
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gblauer wrote:
My belayer did not have any burns on her hands...

Then it would seem that she let go of the rope.

In reply to:
...and she was in the gym climbing the next day.

That says a lot about the "belayer" and the gym.

Jay


davidnn5


Apr 26, 2010, 7:31 AM
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Re: [jt512] Climbing gym disaster [In reply to]
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Those of you who've been reading my recent posts may be shocked, but I actually agree with most of what Jay has said.

I like to belay and be belayed on an ATC. I want my belayer to think shit might happen at any moment, because regardless of the belay system, it can. I don't aid climb, and if I did, perhaps i'd use a grigri. Beats dying because your belayer is asleep.

That all said, I also wear a helmet (much more accepted in Oz than the US seemingly) and anchor against upward pull on single pitch Shocked sports climbs. So perhaps I'm anachronistic. However, it only takes a small amount of imagination to consider all that may go wrong taking the shortcuts people take here. That includes me - I often don't backup when prussiking on two prussik loops! But I also don't live in a country where ice occurs.


hugepedro


Apr 26, 2010, 11:08 AM
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Re: [jmeizis] Climbing gym disaster [In reply to]
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Good Lord, do I need to go all Spock on your asses?

RISK = PROBABILITY * CONSEQUENCE

Level of confidence in one’s belayer does not eliminate the chance that they might ever commit a human error (nor whether you might commit a human error in communicating with them).

High confidence in a highly competent belayer = low PROBABILITY that an incident will occur. But the CONSEQUENCE of a single occurrence is extremely high (potentially the ultimate consequence, death), therefore the risk is high even when the probability is low.

(Ya know, for climbers, y’all ought to be a little more adept with the math of basic risk assessment. I’m not sayin, I’m just sayin.)

I’ve never been dropped by any belayer, whether I had 100% confidence in them or some lesser level of confidence. This doesn’t mean that any of them won’t one day make one error.

Therefore (helps if you read this in Spock voice), it is simply not logical to forgo a safety step that, as Jay pointed out, costs you absolutely nothing, while it may save your life on the infinitesimally unlikely occurrence that you need it to someday. And therefore it is also an illogical point to ask, “why would you grab the rope when being lowered if you trust them to catch you when you fall?”

I always grab the other side of the rope when being lowered, even with belayers that I trust with my life 100% and that have performed perfectly in tricky catch situations and/or have otherwise saved my bacon.

Additionally, I don’t know how long some of you have been in this game, but sometime ago (I wanna say 12-14 years ago) the AAC made a point in ANAM to highlight the fact that an alarming number of dropped-by-belayer accidents were occurring and that they seemed to be on the rise. Grabbing the other side of the rope was suggested as a one simple practice to eliminate the consequences of these occurrences of human error.

Most safety practices that we’ve come to accept as standard in this game have been learned through collective experience and adopted into our communal lore. This is one of them. Of course you may choose to ignore our lore at your own risk.


jmeizis wrote:
If there's never ambiguity about what the belayer's job is when you're climbing, why does that stop when you get to the anchor?

There is also never ambiguity about what we must do before we even start to climb. We must don our harnesses properly, tie in properly, and rig the belay device properly. But you and your partners still double check each other, don’t you?

Any argument against grabbing the belayer side of the rope when preparing to lower is simply not logical.


ClimbClimb


Apr 26, 2010, 6:19 PM
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Re: [hugepedro] Climbing gym disaster [In reply to]
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hugepedro wrote:
Therefore (helps if you read this in Spock voice), it is simply not logical to forgo a safety step that, as Jay pointed out, costs you absolutely nothing, while it may save your life on the infinitesimally unlikely occurrence that you need it to someday. And therefore it is also an illogical point to ask, “why would you grab the rope when being lowered if you trust them to catch you when you fall?”

Good post. To expand on this further.
Let's say you have a% chance of falling and b% chance of belayer failing to catch said fall. Total probability is a times b, a*b. Now, let's say you have a c% chance of belayer failing to lower properly. But when letting go (without holding onto the other rope), you basically have a 100% chance of falling. So that probability is 100% * c% = c%.
Now, let's say b and c are equal (which doesn't actually seem to be true, but lets' say it is), and your chance of falling during the climb is 50%.
Now, your risk of hitting the ground is 50% * b + 100% * b (making a minor approximation). Now, that means that 2/3rds of the risk of hitting the ground is at the top of the climb, and can be removed almost entirely by taking some additional precautions -- REDUCING THE TOTAL GROUND-FALL RISK BY A FACTOR OF 3, for the stated assumptions.
Try it with your own numbers and assumptions of various probabilities, and you'll see that it's never a reasonable argument not to eliminate/reduce some part of the risk.


hafilax


Apr 26, 2010, 6:34 PM
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Re: [hugepedro] Climbing gym disaster [In reply to]
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I think this is more about hoping (wishing?) that there is a chink in one of Jay's arguments.

I ease onto the rope holding the belayer's side from time to time. Gives you more control over taking the remaining stretch out. Sometimes I just drop, trusting my belayer to catch me.

The OP looks like belayer error.


hugepedro


Apr 26, 2010, 7:17 PM
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Re: [ClimbClimb] Climbing gym disaster [In reply to]
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ClimbClimb wrote:
hugepedro wrote:
Therefore (helps if you read this in Spock voice), it is simply not logical to forgo a safety step that, as Jay pointed out, costs you absolutely nothing, while it may save your life on the infinitesimally unlikely occurrence that you need it to someday. And therefore it is also an illogical point to ask, “why would you grab the rope when being lowered if you trust them to catch you when you fall?”

Good post. To expand on this further.
Let's say you have a% chance of falling and b% chance of belayer failing to catch said fall. Total probability is a times b, a*b. Now, let's say you have a c% chance of belayer failing to lower properly. But when letting go (without holding onto the other rope), you basically have a 100% chance of falling. So that probability is 100% * c% = c%.
Now, let's say b and c are equal (which doesn't actually seem to be true, but lets' say it is), and your chance of falling during the climb is 50%.
Now, your risk of hitting the ground is 50% * b + 100% * b (making a minor approximation). Now, that means that 2/3rds of the risk of hitting the ground is at the top of the climb, and can be removed almost entirely by taking some additional precautions -- REDUCING THE TOTAL GROUND-FALL RISK BY A FACTOR OF 3, for the stated assumptions.
Try it with your own numbers and assumptions of various probabilities, and you'll see that it's never a reasonable argument not to eliminate/reduce some part of the risk.

You're out-Spocking me. Nice.


rock_ranger


Apr 26, 2010, 7:30 PM
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jt512


Apr 26, 2010, 7:59 PM
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Re: [rock_ranger] Climbing gym disaster [In reply to]
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rock_ranger wrote:
jt512 wrote:
potreroed wrote:
The belayer in the original post was using a reverso; Gail's belayer was using an atc; both accidents could have been avoided had the belayers been using a gri-gri or a cinch.

For every accident caused by misuse of a conventional belay device, there's an accident caused by misuse of a Grigri. Could that mean Cinches are the answer, or are they just less popular?

Jay

A friend of mine died recently when his belayer with a Cinch dropped him.

Funny how this kind of shit wasn't rapid when it was hip belays. Guess they paid more attention back in the day...

Please misuse words only in less serious posts, so I can give you shit about it without feeling guilty.

Incidentally, the details of that accident would be worth knowing. I don't think I've heard of another serious accident while using a Cinch.

Jay


(This post was edited by jt512 on Apr 26, 2010, 8:01 PM)


rock_ranger


Apr 26, 2010, 8:04 PM
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jt512 wrote:
rock_ranger wrote:
jt512 wrote:
potreroed wrote:
The belayer in the original post was using a reverso; Gail's belayer was using an atc; both accidents could have been avoided had the belayers been using a gri-gri or a cinch.

For every accident caused by misuse of a conventional belay device, there's an accident caused by misuse of a Grigri. Could that mean Cinches are the answer, or are they just less popular?

Jay

A friend of mine died recently when his belayer with a Cinch dropped him.

Funny how this kind of shit wasn't rapid when it was hip belays. Guess they paid more attention back in the day...

Please misuse words only in less serious posts, so I can give you shit about it without feeling guilty.

Incidentally, the details of that accident would be worth knowing. I don't think I've heard of another serious accident while using a Cinch.

Jay

rampant...there's always PM :)


dingus


Apr 26, 2010, 8:07 PM
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jt512 wrote:
Gmburns2000 wrote:
jt512 wrote:
ClimbClimb wrote:
jt512 wrote:
It's obvious what went wrong: the belayer didn't lock off.

Jay, yes, of course, I get that. I'm just wondering -- in tune with other threads on the topic -- whether there are some "belayer warning signs" or the like. The German accident was a leader fall, with much slack out, so that's actually easier to understand than a lowering accident like gblauer describes.

It's unclear from gail's description whether she fell or had clipped into the anchors to be lowered. If the latter, then there is something to be learned: you shouldn't rely on a verbal "got" from your belayer. Rather, before lowering, you should grab the belayer's side of the rope with both hands. Then, after getting the verbal "got," gradually settle onto the rope, not letting go until you're certain that your belayer actually does have you.

Jay

like you do that every single time. [rolled eyes]

Yes, actually, I do do that every single time.

Jay

So do I. I can only conclude (upon reading the rest of the tread) that those critical of this are just being argumentative. Its a STUPID fucking thing to argue against, btw.

DMT

DMT


(This post was edited by dingus on Apr 26, 2010, 8:11 PM)


edge


Apr 26, 2010, 8:18 PM
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dingus wrote:
jt512 wrote:
Gmburns2000 wrote:
jt512 wrote:
ClimbClimb wrote:
jt512 wrote:
It's obvious what went wrong: the belayer didn't lock off.

Jay, yes, of course, I get that. I'm just wondering -- in tune with other threads on the topic -- whether there are some "belayer warning signs" or the like. The German accident was a leader fall, with much slack out, so that's actually easier to understand than a lowering accident like gblauer describes.

It's unclear from gail's description whether she fell or had clipped into the anchors to be lowered. If the latter, then there is something to be learned: you shouldn't rely on a verbal "got" from your belayer. Rather, before lowering, you should grab the belayer's side of the rope with both hands. Then, after getting the verbal "got," gradually settle onto the rope, not letting go until you're certain that your belayer actually does have you.

Jay

like you do that every single time. [rolled eyes]

Yes, actually, I do do that every single time.

Jay

So do I. I can only conclude (upon reading the rest of the tread) that those critical of this are just being argumentative. Its a STUPID fucking thing to argue against, btw.

DMT

DMT

Agreed, it is kinda silly not to.

Even if your belayer is spot on belaying while you are leading, there is something about the pause during cleaning and lowering that can knock them off their game.

Talk to them, keep them engaged in your situation, not the dog sniffing around the packs or the girl in the sport bra, and then still ease onto the rope.

What do you have to lose by doing that?


hugepedro


Apr 26, 2010, 8:23 PM
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edge wrote:
Even if your belayer is spot on belaying while you are leading, there is something about the pause during cleaning and lowering that can knock them off their game.

BINGO.


dingus


Apr 26, 2010, 8:28 PM
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edge wrote:
dingus wrote:
jt512 wrote:
Gmburns2000 wrote:
jt512 wrote:
ClimbClimb wrote:
jt512 wrote:
It's obvious what went wrong: the belayer didn't lock off.

Jay, yes, of course, I get that. I'm just wondering -- in tune with other threads on the topic -- whether there are some "belayer warning signs" or the like. The German accident was a leader fall, with much slack out, so that's actually easier to understand than a lowering accident like gblauer describes.

It's unclear from gail's description whether she fell or had clipped into the anchors to be lowered. If the latter, then there is something to be learned: you shouldn't rely on a verbal "got" from your belayer. Rather, before lowering, you should grab the belayer's side of the rope with both hands. Then, after getting the verbal "got," gradually settle onto the rope, not letting go until you're certain that your belayer actually does have you.

Jay

like you do that every single time. [rolled eyes]

Yes, actually, I do do that every single time.

Jay

So do I. I can only conclude (upon reading the rest of the tread) that those critical of this are just being argumentative. Its a STUPID fucking thing to argue against, btw.

DMT

DMT

Agreed, it is kinda silly not to.

Even if your belayer is spot on belaying while you are leading, there is something about the pause during cleaning and lowering that can knock them off their game.

Talk to them, keep them engaged in your situation, not the dog sniffing around the packs or the girl in the sport bra, and then still ease onto the rope.

What do you have to lose by doing that?

Even if you (or I) don't do it, won't do it and never ever do it... doesn't mean we should try to argue our choices onto someone else. That to me is where the Stupidity arises.

JT512, how DARE you employ more safety procedures than me? The NERVE!!!111111

DMT


jt512


Apr 26, 2010, 8:52 PM
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Re: [ClimbClimb] Climbing gym disaster [In reply to]
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ClimbClimb wrote:
hugepedro wrote:
Therefore (helps if you read this in Spock voice), it is simply not logical to forgo a safety step that, as Jay pointed out, costs you absolutely nothing, while it may save your life on the infinitesimally unlikely occurrence that you need it to someday. And therefore it is also an illogical point to ask, “why would you grab the rope when being lowered if you trust them to catch you when you fall?”

Good post. To expand on this further.
Let's say you have a% chance of falling and b% chance of belayer failing to catch said fall. Total probability is a times b, a*b. Now, let's say you have a c% chance of belayer failing to lower properly. But when letting go (without holding onto the other rope), you basically have a 100% chance of falling. So that probability is 100% * c% = c%.
Now, let's say b and c are equal (which doesn't actually seem to be true, but lets' say it is), and your chance of falling during the climb is 50%.
Now, your risk of hitting the ground is 50% * b + 100% * b (making a minor approximation). Now, that means that 2/3rds of the risk of hitting the ground is at the top of the climb, and can be removed almost entirely by taking some additional precautions -- REDUCING THE TOTAL GROUND-FALL RISK BY A FACTOR OF 3, for the stated assumptions.
Try it with your own numbers and assumptions of various probabilities, and you'll see that it's never a reasonable argument not to eliminate/reduce some part of the risk.

You have failed to take into consideration that your belayer can only lower you if he hasn't already failed to catch you on a fall. Your formula for the total probability of decking d is

d = ab + c .

To see that this is obviously wrong, let a = b = c > 0.62, and note that d > 1.

The correct formula would be

d = ab + (1 – ab)c .

You should probably also explicitly state the assumption that you can fall at most once per ascent.

Jay


jt512


Apr 26, 2010, 8:58 PM
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Re: [edge] Climbing gym disaster [In reply to]
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edge wrote:
dingus wrote:
jt512 wrote:
Gmburns2000 wrote:
jt512 wrote:
ClimbClimb wrote:
jt512 wrote:
It's obvious what went wrong: the belayer didn't lock off.

Jay, yes, of course, I get that. I'm just wondering -- in tune with other threads on the topic -- whether there are some "belayer warning signs" or the like. The German accident was a leader fall, with much slack out, so that's actually easier to understand than a lowering accident like gblauer describes.

It's unclear from gail's description whether she fell or had clipped into the anchors to be lowered. If the latter, then there is something to be learned: you shouldn't rely on a verbal "got" from your belayer. Rather, before lowering, you should grab the belayer's side of the rope with both hands. Then, after getting the verbal "got," gradually settle onto the rope, not letting go until you're certain that your belayer actually does have you.

Jay

like you do that every single time. [rolled eyes]

Yes, actually, I do do that every single time.

Jay

So do I. I can only conclude (upon reading the rest of the tread) that those critical of this are just being argumentative. Its a STUPID fucking thing to argue against, btw.

DMT

Agreed, it is kinda silly not to.

So, finally, the rope grabbers are coming out of the closet. I now count four of us, with at least three of us being among the most experienced climbers on the site.

In reply to:
Even if your belayer is spot on belaying while you are leading, there is something about the pause during cleaning and lowering that can knock them off their game.

That is well put. I was trying to analyze exactly why lowering after cleaning is "different," and couldn't quite do it. The bottom line is exactly what you said.

Jay


hugepedro


Apr 26, 2010, 9:19 PM
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Re: [jt512] Climbing gym disaster [In reply to]
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jt512 wrote:
So, finally, the rope grabbers are coming out of the closet.

Uh-huh-huh. Uh-huh-huh. Uh-huh-huh.


(Just for the record, I don't want to be included in the AARP club, even if I might qualify. Ruins my game with the honeys.)


ClimbClimb


Apr 26, 2010, 9:25 PM
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Re: [jt512] Climbing gym disaster [In reply to]
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jt512 wrote:
Now, your risk of hitting the ground is 50% * b + 100% * b (making a minor approximation).

You have failed to take into consideration that your belayer can only lower you if he hasn't already failed to catch you on a fall. ...
I did not fail. I made the minor approximation, which I noted above. This and the other point you mention are unlikely to make a big difference in the final outcomes. I would be glad to do the full math out for you, but I think it'll really nerd everyone else out.


jt512


Apr 26, 2010, 10:09 PM
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Re: [ClimbClimb] Climbing gym disaster [In reply to]
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ClimbClimb wrote:
jt512 wrote:
ClimbClimb wrote:
Now, your risk of hitting the ground is 50% * b + 100% * b (making a minor approximation).

You have failed to take into consideration that your belayer can only lower you if he hasn't already failed to catch you on a fall. ...

I did not fail. I made the minor approximation, which I noted above. This and the other point you mention are unlikely to make a big difference in the final outcomes. I would be glad to do the full math out for you, but I think it'll really nerd everyone else out.

Well, in my humble opinion, you did not "make a minor approximation." You made a major mistake, leading to mathematically impossible results. As I stated above, your approach can lead to "probabilities" exceeding 1, which are nonsensical. If you want to "do the full math for me," please do, although I think I actually did it for you in my previous post.

Jay


(This post was edited by jt512 on Apr 26, 2010, 10:25 PM)

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