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  1. Phil

    The Body Language of Trees - A handbook for failure analysis

    11. "Safety Factor = breaking stress of the material / working stress. The preservation of a species is costly when an individual dies and has to be replaced. But it is undoubtedly more expensive to design each individual to withstand the most unlikely loads. The natural ballance is therefore...
  2. Phil

    Placing outrigger from aerial lift on a raised curb for operation.

    Same. If there was a height difference between the curb top and soil, I would put cribbing on the soil to make even with curb. This was usually a small difference if any.
  3. Phil

    Placing outrigger from aerial lift on a raised curb for operation.

    Scenario: You are going to work off the passenger side of your aerial lift truck. You are close to a curb and when the outrigger is lowered, it rests on the outrigger pad which is placed on curb itself. The outrigger and pad are centered on the curb and the curb concrete is in good condition...
  4. Phil

    The Body Language of Trees - A handbook for failure analysis

    10. "When a reparative symptom is found, the only assumption that can be made is that the tree has a defect which it is attempting to counter by means of adaptive growth. On no account must every tree bearing symptoms be felled! In the human sphere this would mean dispensing with all medical...
  5. Phil

    The Body Language of Trees - A handbook for failure analysis

    I'll ask my buddy. I don't have access to the book though.
  6. Phil

    Petzl i'd small and large - $175 shipped each

    Bump price dropped to $175 each.
  7. Phil

    The Body Language of Trees - A handbook for failure analysis

    9. "The axion of uniform stress: The average thickness of an annual ring is regulated by biological factors and by the growing conditions, whereas its relative thickness at different points on its circumference is directed mainly by the stresses imposed by the mechanical loading at each point...
  8. Phil

    The Body Language of Trees - A handbook for failure analysis

    8. "Thin stems have relatively large root-plates, that is high rootplate radius / stem radius values. Relative to stem radius, fat (heavy) trunks require less room for anchorage, they press down more heavily than thin ones on the frictional surfaces between the root ball and the surrounding...
  9. Phil

    Use of RRP without EN 1891 A lines

    Is it generally allowed in comps to use the rope runner pro without en1891 type a specific lines? I use 11.7 double braids like blue moon and hyper climb, but the manual for RRP says to use en1891 A ropes.
  10. Phil

    The Body Language of Trees - A handbook for failure analysis

    7. "In an unpruned, healthy tree the relative area of the crown, stem cross-section, and the root plate will be perfectly matched to the wind load as 'measured' by the tree. It would be life-threateningly extravagant for the tree to treat itself to an impressively thick trunk beyond the needs...
  11. Phil

    The Body Language of Trees - A handbook for failure analysis

    6. "Can we fully appreciate that the anchorage of a tree in the ground is a stroke of genius on the part of nature. Here we have the weight of a tree, with all the bending forces from the wind, acting on it, and supported by the yielding ground, which has no more inherent resistance against...
  12. Phil

    Petzl i'd small and large - $175 shipped each

    Bump. Price dropped to $200 each.
  13. Phil

    The Body Language of Trees - A handbook for failure analysis

    Found the attached doc. Couple choice excerpts: "Mechanical properties of wood Parallel-to-grain properties. The parallel-to-grain direction is the strongest and stiffest from a structural perspective. The tensile strength of softwoods parallel to grain at 12% moisture content generally ranges...
  14. Phil

    The Body Language of Trees - A handbook for failure analysis

    I had the same question when I heard this one. I would like to see some empirical data from compressive and tensile failure testing. Keep in mind that comparing the compressive strength of wood to tensile strength of wood does not equate to saying that wood is weak in compression. It's all...
  15. Phil

    The Body Language of Trees - A handbook for failure analysis

    5. "It is compressive loading which most often caused failure. The resistance of wood to compression is often only half as great as its resistance to tension."
  16. Phil

    The Body Language of Trees - A handbook for failure analysis

    4. "Even the soundest tree can fail, and it is therefore not always possible to blame accidents, whether serious, fatal or otherwise on mechanical defect. "
  17. Phil

    WTB Rope Runner Pro

    I believe it. If I'm not mistaken, for the ascent event he footlocked, but since he had none of his gear he somehow used the extra tail of the rope to tie the footlock prussic. I might be remembering that wrong but he did something funky that passed inspection.
  18. Phil

    WTB Rope Runner Pro

    I know Beau pretty well. He's a good dude. Got the competition down to a science at this point. I usually help setup the event and tree tech the ascent event and masters. I had enough competitors/friends berate me into competing next year so I'm going to humor them lol. I know my MO and its...
  19. Phil

    WTB Rope Runner Pro

    I use the 11.7 lines. Currently have hyper climb for my long rope and blue moon for my mid and short ropes. I've been using the hhxf for the last couple years and don't exactly want to swap but I feel like I should be familiar with some of the more commonly seen devices in the field. Expand...
  20. Phil

    The Body Language of Trees - A handbook for failure analysis

    3. "In nature, the death of a single tree is just as unimportant as the death of a single person - its suffering means nothing; all that counts is the preservation of the species."
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