SouthSoundTree-
TreeHouser
- Joined
- Sep 24, 2014
- Messages
- 4,941
Hitch hiker srt/ddrt device or hitch climber pulley?
With the hitch climber pulley ... Don't I just connect a schwabish friction hitch above it...
If you are climbing DdRT, you have two strands of rope bearing your weight. A 200 pound climber , on a friction-free pulley, ddrt system is going to load each strand with 100 pounds of force. 100 pounds on the hitch. A 200 pound climber will exert 200 pound of binding force on the hitch, while suspended on one strand.See I was confused about that .. Thank for the info. So for the SRT I'll need a rope wench to keep the friction off of the friction hitch..? And the photo I shared was ddrt
Arborist learning the ropes
Isn't that basically what I said a few posts ago?
If I were you mate, start climbing with your doubled rope / Hitch climber pulley system. Get comfortable and familiar with climbing and moving around a tree and descending.
While doing this, read much more about SRT, watch YouTube videos and ask more questions.
Then gradually make the switch to real Single Rope Technique climbing, at least you'll have half a clue about what everything means and what bits of equipment are meant to do what!
Yes for a DdRT system as shown in the photo where the friction is shared between the hitch and the TIP above and your weight is shared between the two legs of the rope. However, you asked about SRT systems and without the shared friction and halving of weight the hitch will tend to bind up and also risk overheating/glazing the hitch and climbing rope. To prevent this, SRT systems use an additional mechanical device like the rope wrench or hitch hiker to share the friction with the hitch.
Here is an example of an SRT setup with the Rope Wrench...
View attachment 60873
I tend to want to build in as much redundancy into my climbing systems as possible, for the sake of safety.
Bowline can slip up the tree. Use a cinching knot like a running bowline. Better yet, use a tensionless anchor.
http://portal.treebuzz.com/simple-lowerable-base-anchors-719
In this picture it is easy enough to tie the tail of the climbline, to the tail of a rescue line. You can then lower a climber from any height. No cutting sh*t in an emergency. Nothing moves until you unwind the trunk wraps.
Any base anchor can be set at 6-8' with a strong enough stool (Rubbermaid garbage can, hand truck, log chunk).
This takes out the "I work with people who's judgment I can't trust with a base-tie and a saw" reasoning.
This also reduces the chance of a log bombed out of the top of the tree bouncing against your rope. Most logs hit lower, IME.