DRT?

[davej]

I have been told that "everyone knows this" so I will ask... Is DRT another name for DdRT? Is it another name for SFL? Is it another name for DdRT or SFL? Is it specific or vague?

 

[Raven]

Hope you don't mind a reply to this and not just a vote, but I believe apprpriate use of terminology is critical for us to communicate effectively. So here are the acronyms as I understand them (as they apply to TREE climbing), I hope I'll be corrected if mistaken.

DdRT = Doubled Rope Technique - a rope is doubled over a tree limb and and can be used either STATIC(not moving) where neither leg moves as in footlocking or DYNAMIC(in motion) where one leg moves up while the other moves down as in traditional climbing.

SRT = Single Rope Technique - a static line used mainly for gaining access to the upper canopy

DRT = Double Rope Technique - this is two seperate ropes with two seperat anchor points, one is the access/positioning line as inSRT, and the other is a backup. This is used primarily by window washers and other industrial high angle people, not suitable for tree work.

ALT = Alternate Lanyard Technique

 

[easyphloem]

I understand DdRT and DRT to be two different things.


But that is based on conjecture, rhetoric, and hearsay.



SZ

 

[tod_k]

DRT also comes from ice and alpine climbing also know as twin ropes. You use two skinny ropes while on lead alternating protection.

 

[Tree_Machine]

terms of techniques part 1

re: Raven DdRT = Doubled Rope Technique - a rope is doubled over a tree limb and and can be used either STATIC(not moving) where neither leg moves as in footlocking or DYNAMIC(in motion) where one leg moves up while the other moves down as in traditional climbing.

This describes two entirely distinct and different rope techniques under one name.

The use of static vs dynamic is a confusing one also as there are dynamic ropes (ropes that have inherent stretch) and static ropes (ropes with little to no stretch). Still, Raven's description is technically correct.


However DdRT can not mean both DYNAMIC(in motion) and STATIC(not moving) even though both are doubled rope techniques. The former is a 2:1 system (traditional friction hitch system) and the latter is a 1:1 system, very different from one another.

In threads of years past the traditional hitch system (2:1) has been described as DdRT and the more efficient, though lesser used system has been termed DbRT.

Even that is confusing i.e. which one is 'd' and which is 'b' ?

Still, it's important that they're not called the same thing.

 

[Tree_Machine]

Re: terms of techniques part 2

DRT, as correctly described by TodK is a dual rope method or DOUBLE rope (not doubled rope, used in treework that uses two ropes by the climber. Each rope can be used in either of the two doubled rope techniques described above,
for instance,

You are on-rope, traditional DdRT 2:1 friction hitch in a big oak. You need to get over to another quadrant of the tree 20 feet away. You set rope #2 in that stem, apply dual ascenders to that second rope and 'ascend' (traverse) on the "STATIC(not moving)" rope while belaying yourself out from the "DYNAMIC(in motion)" rope.

All at the same time you are DRT using DdRT and DbRT, that is, two ropes (double rope or DRT) one being utilized in a 2:1 descent mode (DdRT) and the other used in a 1:1 (DbRT) ascent mode.

Personally, I don't like the DdRT DbRT nomenclature, but historically, this is how it's been.

What to call them may still be a bit fuzzy, but what they are is hopefully more clear.

 

[Tree_Machine]

difference between doubled rope techniques

STATIC(not moving) where neither leg moves as in footlocking or DYNAMIC(in motion) where one leg moves up while the other moves down as in traditional climbing.


Footlocking has nothing to do with the rope techniques. Footlocking can be used with either technique, or not used with either technique. Footlocking is a choice.