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  1. Dan Thornton

    More thoughts on the finer details of rope walking ascents

    That is my habit. Busted! I will consciously 'test' the hitch to see if it automatically engages more often than just before the climb. Thank you. Here's my question, if I can put it in words. It's about how to develop endurance in doing long ascents. Where is the balance point in rope...
  2. Dan Thornton

    Today....

    Never before worked in dense ivy. Now I'm looking at three jobs covered with it.
  3. Dan Thornton

    Pillow Talk

    There are good chiropractors and bad. I went to one 30 years ago with only little help, didn't go back. So glad, because a family member started going to her and got pulled into a swamp of strange mythical and mystical procedures. Then eight years ago, I went to a different chiropractor for...
  4. Dan Thornton

    Climber looking for work in Asheville, NC area

    My tree business consultant strongly suggested doing any business only part-time (2 days a week) for at least a year. Boy that was great advice. First, I still had my main job and didn't hurt myself while I was still bidding too low. Second, all my income could go into more training and...
  5. Dan Thornton

    Another physics spinoff question - back leaning

    Codom came down a long way, but not all the way to the felling cut. I did benefit from my tree expert in three ways. One was the codom. When I climbed and tied the pull rope, I included leads from both sides of the codom in the running bowline loop, at his suggestion. Second suggestion he made...
  6. Dan Thornton

    Today....

    Here's the one that got away. I was able to refer another company that will do the job for less than I can. Would have been fun, though. Probably would involve a combination of speedline and span rigging. Only a little bit of free falling possible. Job is to remove a black birch and a shagbark...
  7. Dan Thornton

    Another physics spinoff question - back leaning

    About 36" DBH. I'll set rope (5/8" Yale XTC) high in tree, pulling almost directly ahead, through block, to side, using a GRCS. Nothing wrong with the tree - a pine. Homeowner called it a yellow pine, but I haven't confirmed that, or discerned which kind of yellow it would be here in western...
  8. Dan Thornton

    Another physics spinoff question - back leaning

    It took me a while to follow your calculations. Looks good. To use this information requires some skills I'm still trying hard to develop: 1. estimating where is the Center of Gravity 2. estimating how heavy is the tree / piece / top I think it was one of Patrick's videos (Muggs) where he...
  9. Dan Thornton

    Brand New Husqvarna T540i XP Kit

    PM sent
  10. Dan Thornton

    Hello. Do you still have one of those Husky Battery saws left? I would love to have one of those...

    Hello. Do you still have one of those Husky Battery saws left? I would love to have one of those but can only swing $700 at this time. I understand if you need to wait for someone with the full $850 but let me know if you have one for me at the lower cost. Dan Thornton
  11. Dan Thornton

    Today....

    Wednesday, I took down an ailing pin oak, situated in a fenced school playground. What made it special was that I grew up on that property (before the church and school were built) and certainly played around that tree.
  12. Dan Thornton

    Best Rake

    I was wondering the same. Saw the Beaver Rake Head at arborist.com and liked the idea of using it on poles I already store, but have no idea how well it would work.
  13. Dan Thornton

    Milwaukee top handle is coming

    Yes, I did. Impressive vertical bury of the bar into the ground. Glad my grounds woman was not under the lift. I was using the sectional polesaw, not the extending version.
  14. Dan Thornton

    Physics Question: Basal vs Canopy Anchor Forces

    I know - I was surprised by this as well! Here's Wikipedia: "Note that the radius of the cylinder has no influence on the force gain." (See "Capstan equation" in Wikipedia). BUT our intuition and objections are partly right ... friction can come from other places than just the rubbing between...
  15. Dan Thornton

    Physics Question: Basal vs Canopy Anchor Forces

    Yes, the rope construction makes a difference in the amount of friction. Nylon is different from polyester which is different from amsteel. And for the same rope it makes a difference whether it is clean, wet, dirty, or sappy. Then for the porta-wrap the kind of metal makes a difference and...
  16. Dan Thornton

    Physics Question: Basal vs Canopy Anchor Forces

    Then if your groundsman is a math geek like me, he'll probably object when he notices that a single wrap only touches the main part of the porta-wrap for 270 degrees, not 360 degrees. At that point you can thank him for noticing, compliment him that he has a promising future in tree work because...
  17. Dan Thornton

    Physics Question: Basal vs Canopy Anchor Forces

    I probably should have left the "degrees" column off to avoid confusion. In figuring friction of a rope going around a bollard or cylinder (in our case, a porta-wrap) what matters is the number of degrees the rope is in contact with the cylinder. So a 'half-wrap' is when the rope contacts the...
  18. Dan Thornton

    Physics Question: Basal vs Canopy Anchor Forces

    Bart said: "Still waiting for someone to calibrate a porty for tension ratio vs wraps. Its exponential." I have developed my own rule of thumb for porta-wrap friction. Maybe it will be helpful to someone. It obviously has to make many (too many) assumptions. But I still find it useful. Here...
  19. Dan Thornton

    Inversion Table

    Not necessarily. The point of an inversion table is to 'hang' your weight on the ankles or feet so that the head and shoulder weight stretches the joints - the opposite of the compression the joints get all day long. Laying on the ground won't do this if there is a lot of friction between the...
  20. Dan Thornton

    GRCS Storage

    I try to reuse things I already have and I like how this one turned out. Plus, it's in the right order for setup. A ratchet strap holds the GRCS frame on top of the Craftsman rolling case. 1) Remove ratchet strap and place it on the tree. 2) Hang the GRCS frame on the strap for easy attachment...

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