This may be old, but I just got an idea.

[WWCTreeCrew]

Have you ever wanted to put a line in the top of a really tall tree but your line was too short to touch the ground with both tails? You could climb and recrotch, but I thought about using the throwline as an extention of the climbing line would be a little easier. I drew a really bad diagram on paint if you want to see. Once the throwline is in the high crotch you want you create a continuous loop with both lines. Pull the climbing line up into the tree until the tail just comes off the ground. Take the climbing line tail and tie a running bowline around the throwline. Then pull the throwline down which should make the running bowline run up the throwline and then your climbing line until cinching down on the high crotch. Now you can climb SRT until you get to the top set-up and work your way down. I know you'll have to re-crotch on the way down, but that's a whole lot easier than tring to throw the line up as you climb. This maybe old news, but the idea just ran through my head while I was sitting here.

 

[Mark Chisholm]

It'll work.

 

[TheTreeSpyder]

i've don similar when playing with SRT, recrotch 1x to descend. Except i placed a riggin'line on krab in the bowline eye. Then, climb SRT, lanyard in, pull bowline down with with riggin'line, to tie in DdRT and have riggin'line to use too. Or even when climbin'line is long enough; but want to climb SRT, and work/descend DdRT, but don't have to go all the way up to support to switch over, and still have riggin'line in the werks too.

 

[AxeKnot]

I think within the next ten years it will become the standard to use a back up rope when using SRT.

Which would mean installing 2 climbing lines in the tree before you ascend.

When you are using the Running Bowline technique as an anchor point high up in the tree, you cannot possibly see that the anchor point is safe.

It could have a pocket of rot on the upside of the branch where your rope is choked/cinched.

Should we start using 2 SRT lines both with individual anchor points for access into the tree.

Any thoughts on this?

 

[TreeCo]

I've used this technique dozens of times. As soon as I get the "too tall" part of tree done I re-crotch so I can get to the ground in a hurry DbRT.

 

[TheTreeSpyder]

One of my tests is before running bowline up; anchor 1 end on ground and jump on other end for bodyweight X Impact X 2 (-Friction). Also extend that to having someone bigger or a couple of people do same to pretest; then run bowline up.

 

[Colin]

[ QUOTE ]

When you are using the Running Bowline technique as an anchor point high up in the tree, you cannot possibly see that the anchor point is safe.

[/ QUOTE ]

Wouldn't that be the case for any method, running bowline, DRT, Friction Saver etc?

[ QUOTE ]
It could have a pocket of rot on the upside of the branch where your rope is choked/cinched.

[/ QUOTE ]

Isn't that the reason why you conduct a hazard assessment prior to the climb?

Selecting suitable high points and knowledge of the species is part of the arborists role and if you have good ground support their role but ultimately if you decide to climb on it you better check it.

There has also been a number of crotch failures during ascent or when limb walking even after testing of forces on the rope prior to climbing. Here in lies the anomoly of what is safe and having a back up. The more you disect each incident the more you realise that climbing trees is dangerous and there are constant unknowns that you trust your life to. Ultimately the regulations will state that where-ever a tree can be accessed by a method other than climbing that needs to be the method deployed first, costs of such being irrelevant. So if you can get a lift do so, and if not then you'll need some documentation as to why not.

If a climber is injured in a tree and the safety people see that a bucket could easily have been used then you'll be in deep trouble

 

[No_Bivy]

Binoc's can help scope out the question areas. Hidden decay is always an issue even if you are right at the tie in to see it.

 

[PUClimber]

As far as single line up with a back up. I would hope Mark would shed some light on a set up he showed at the TCIA in his demonstration at the stihl booth. It was a set up going up single line using a floating false crotch but he ran his false drt line up through his pulley and somehow secured it to back up the other line when using his dual ascenders.