Tandem Hitch, sDdRT

treebing said:
Yeah, I don't see why you couldn't have that system and run DRT off it all day. You would lose dynamic movement. But if you set it up that you could tend with one hands it would be nice.
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That's what I tried to capture today with the camera but it turned into a nightmare since I haven't used it in so long. I was quite able to climb with a prusik hand and a brake hand or just the prusik hand alone. It does make the prusiks a bit more touchy since it's even less friction aiding them than climbing on a pulley. They act like they were in an absolute zero friction SRT.d system (;)) so they really have to be tuned right. Mine were just a bit too long for how I normally run them with a Rope Wrench.
 
I've got a picture of the French dual hitch setup that I took at the ITCC in Salt Lake City in '97. It's a very clever system...why didn't I ever do anything with it?!

There are lots of pluses and no minuses that I can see...except one. If the climber used this setup but then moved in the tree on one hitch like a DdRT climb they would move closer to one end of the rope. If the climber didn't put a stopper in the end or wasn't paying attention they could go off the end. A solution would be to have an eye splice in that end of the rope to act as a stopper but not be so bulky that it won't tail through the canopy.

My guess is that you've tried different pulleys for slack tenders. Here's an idea...use one of the ISC Double Re-direct pulleys:

http://www.iscwales.com/Product/RP031-Double-Re-direct-Pulley/?from=/By-Type/Pulleys/

ore even one with a becket or middle cheek plate instead of two separate pulleys. The one from ISC has cheek plates bent in a way that the two ropes don't jump out of the sheave and cross each other.

Nice system to share!
 
Tom, re double pulley? surely that would defeat the purpose of being able to switch to DdRT?

I also thought the French system was flawed with the trailing end of one leg of rope getting shorter and shorter as work continues (if you switch to DdRT) , it makes the whole system a bit weird, in that you originally set the system up for SRT type ascent/descent but by the end of your work SRT type descent can no longer be achieved if one end of your rope is very short.
 
That's the reason why I was trying to put the system together. Again, it was inspired by Kevin trying to climb DRT with 2 independent stationary ropes. I thought that if I had 2 independent lines with a hitch on each one, than each hitch would take 1/2 my weight and perform properly if I could operate them simultaneously, not one or the other, or quickly alternating... so I went outside and threw a line over a branch and tied in two hitches.

The simultaneous operation was the key, and when I see the system being used in older videos, no one was using it like I was trying to. They all seem to be descending in a traditional DdRT manner (one tail is eventually shorter than the other). They were getting the ascending benefit, but not the SRT descending benefit. This system can be used with the rope not moving at all and remaining equalized the entire climb, or you could use two totally independent lines and maintain parallel configuration.

That's really the difference. I know the system has been "built" before, but I never knew it could be used like this. My guess is that it would be a competition legal way to actually climb SRWP "style"...not that I intend to try that.;)
 
TC...I think that the double sheave pulley would work as along as there is some space between the top of the pulley and the bottom of the hitch. It looks that way with Oceans setup in the vid using two Hitch Climbers.
 
tomthetreeman said:
SDRT - Stationary Double Rope Technique.
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Or, Double Stationary Rope Technique?

Re the double sheave pulley, I sort of thought that most have the cheeks folding into a narrow point at which a connector can be attached. My only issue would be figuring out where there would be room to position the hitch eyes. The double Hitch Climber setup is pretty clean. Later on, I tried using them with independent carabiners (both connected into the upper bridge swivel eye). and a soft acc. cordage connection at the middle becket. This looked almost identical to the system in the vid, but it allowed each HC unit to be moved around for more options. With the William holding everything, it's fine on a single doubled line, but if you were climbing DsRT (DRT.s.s...whatever:eek:), you'd want the HC units to be independent.
 
Come on, that emoticon above was CLEARLY drawn to represent a dude that doesn't know what acronym to use. Clearly.
 
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