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i think you will need to refersh on force vector mechanics... because the stem does infact load regardless of how good you claim your ground guys to be. The resulting force on the tree could be decreased or mitigated with proper rigging and using the right ammount of tension but if you are speedlining you will be loading the trunk laterally.
 
Hey Steve no need to refresh on vector mechanics there buddy, what I meant was that each trees different and you have to know how much rot, decay and whatever else it has going on in it. Plus experience and knowledge. We aren't going to load up anything past the point of or take risks for
Tree failure. I was talking about how we do it and how the stem/trunk takes absolutely no force if you have the speed line tensioned correctly and the guys on the ground let the rift slack out of the port a wrap. Believe me, we do things right and me and my crews have a lot of experience between us all. When we speed line it's either we can't get the crane or lift in or there are targets below we can't rig stuff down the normal way. I'll see if the co. I did a job for Friday has some video or pics of 2 95' beech trees we did just to show you. We speed lined everything down to the last 20' where we flopped the trunks.


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I don't think Steve is claiming its not a good system to employ, I don't think he's claiming it can't, or shouldn't be done. He IS claiming however, that the forces are side loading the tree from the pull on your anchor, be it major or minor. YOU, however, are claiming the tree sees NO load. I believe this to be incorrect. Virtually unnoticeable load if used ideally? Sure. Zero load? No, I disagree.
 
deevo said:
A lot better then negative blocking forces and I think we can all agree on that ! Lol


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yes and no. even with a dead tree, it can withstand a tremendous load when loaded axially, in line with the trunk itself. compared to a speed line that same tree could fail with lighter weights.

even rigging just 50lb limbs from a tree could create a resultant force equivalent to that of a person pulling on a rope (like you were to pull a trunk over) depending on the rope angles from tree anchor to weight midline and then the angle from the midline weight to the ground anchor. a good rule of thumb is any rope angle (from top of tree to ground anchor) less than 45 degrees (closer to horizontal than vertical) will amplify the weights ziplined substantially.

essentially the more vertical the line can be kept while still avoiding hazards will result in the lowest force vectors on the tree. The rigging system that imparts the least amount of force on the trunk would be a vertical speed line straight down

-Steven
 
[QUOTE="jmaher, post: 431001, member: 8477"YOU, however, are claiming the tree sees NO load. I believe this to be incorrect. Virtually unnoticeable load if used ideally? Sure. Zero load? No, I disagree.[/QUOTE]

Couldn't agree more. And glad to see that you do as well, deevo.

And that comes from over 25 years of experience speedlining.

A good technique is to guy the stem against the side load, if there's any doubt as to its structural integrity.
 
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