probably my fault... but don't you hook your rappel device to the end you initially lowered down to the ground and the rope directly coming out of the sling to the ground? just leave the "tail" end that comes from the ground up to the knot unweighted and able to stay unweighted until the who ever rappels reaches bottom.

I'm having trouble understanding you. But just don't rap the line tied to the trigger.

The TRT I've used lots on sport routes, But I think I'd agree that a remote garage door method would be far preferable.
Think about THIS, kiddies: the 'trigger rope" has a weight of it's own. it is constantly pulling on the trigger, irrespective of whether or not you pull on it. Over the course of 20 or 30 meters of rapping, that rope weight can be pretty significant. It will pull the trigger.

I can easily see how, if you just unweighted the cam for just a tenth of a second on the rappel, this thing would turn into an instant death machine. Good luck out there, and let me know where and when you're gonna use it so I can come and collect the shiny new rack that you were so afraid of leaving any of it on the wall, I'll come and scavenge it off your dead body. Cheers.

I set this up and tried it yesterday in a horizontal at about head height. Worked like a charm.

Some observations:

1. Deep cam placements were harder to clean than less deep. I'll leave it to individuals to find their own balance between safety and ease of retrieval.
2. Placements that were closer to the overcammed end of the spectrum were also more difficult to clean. I found a placement somewhere in the middle (leaning ever-so slightly toward undercammed) to work best.
3. I sometimes needed a good stiff yank to clean one or both cams, which leads me to believe that the more rope you have in the system, the more difficult they might be to clean (due to rope stretch).
4. Constricting placements were significantly more difficult to clean. Parallel-sided cracks worked best, but slight irregularities were also doable.
5. Somebody above mentioned that the weight of the rope hanging on the triggers might cause the whole shabang to fail. This may be different in vertical or bomb-bay cracks, however, in every trial, I had to pull harder than the weight of a rope to free the cams. Also, I don't think it's possible to clean the cams with a person's full body-weight on the rap line. Still, avoid throwing the retrieval end of the rope before rappelling.

Use your own judgment about your cams' landings.

Yeah...I obviously DID read that post.
And I'll still be happy to collect your gear from your dead body. Go on and use this method...I'll wait for word of the accident. You fail to recognize that, just because it works in a few tests, doesn't mean it's safe.
I mean, really, why READ the statistics from "Accidents in North American Mountaineering" when you can actually BE the subject of a featured article in AINAM?

Yeah...I obviously DID read that post.
And I'll still be happy to collect your gear from your dead body. Go on and use this method...I'll wait for word of the accident. You fail to recognize that, just because it works in a few tests, doesn't mean it's safe.
I mean, really, why READ the statistics from "Accidents in North American Mountaineering" when you can actually BE the subject of a fea tured article in AINAM?

Not sure what version of this trick most guys in here are experimented with but the version I offered few years back is a bullet proof and probably the only way to escape a trad situation using cams . The only modification i have made since mentioning this method is to run the release cord in "S" format (over and under the pin) instead of running it directly over the release pin.

Again, this should not be used by n00bs.

Yeah...I obviously DID read that post.
And I'll still be happy to collect your gear from your dead body. Go on and use this method...I'll wait for word of the accident. You fail to recognize that, just because it works in a few tests, doesn't mean it's safe.
I mean, really, why READ the statistics from "Accidents in North American Mountaineering" when you can actually BE the subject of a featured article in AINAM?

You know, I actually agree with that. If you don't have your game dialed, there's absolutely no decent reason to go all Chuck Yeager on this rig. Maybe the wind blows hard and pulls on your retrieval rope or some numbskull on the ground pulls it for whatever stupid reason... Hell, I thought it up and you don't see me running out to rap on that jingus shit.

It would suck for the last words you hear to be "Hey there! let me give you a fireman's!"

My point about this rig is NOT that it would come out when fully weighted, (DUH) but rather that you'd make a little error of unweighting the rig for a half second by stepping on a flake or a little edge, thus allowing the trigger pull rope to do it's thing while you're still up in the air.

Majid
I got several emails from you asking me to explain how this rig works.

For the walking crash pad you mean

Hammered like a piton.

In all fairness, Majid did say he didn't know what they were doing.

Cool trick, but do you really think you could generate enough force to release the triggers when pulling an entire 100 feet worth of dynamic rope?

GO

I honestly don't know for sure, but I think yes. Of course, it'll send the whole rig rocketing toward the ground at greater than gravity speed. The guy at the Gunks last weekend got hit by one lousy freefalling gold Camalot and he didn't fare too well.