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  1. M

    Funny little plug, and super excited

    Hey all, The Irish Chapter of the Arb Association has this workshop coming up that I'm super excited to be a part of! We are going to "get data" and talk rigging, and hash out upcoming ideas. It will be a neat day to collaborate! If you are in the area and interested, check out the link...
  2. M

    "Bump" for Graeme McMahon

    OMG... I come in here to have a peek around and Graeme is here!!!
  3. M

    Jonny, I am hesitant to openly share the file... as Arb News needs to get it's due. ;) But as...

    Jonny, I am hesitant to openly share the file... as Arb News needs to get it's due. ;) But as an open source scientist... using things like Python and R cause they are free... Here you go, please don't openly post for at least a few weeks, and you don't know where you got it. ;) Matt
  4. M

    Rigging Research Part Deux

    Hi Jonny, The current year arb news is subscription based, part of an ISA membership (past years available free online). But I'm happy to share the relative info here and wherever. https://www.isa-arbor.com/Publications/Arborist-News I'll slowly start to fill the gaps.
  5. M

    Rigging Research Part Deux

    Hi, I do mean below. ;) I have been practising this for years... and teaching it, and have some ardent followers ;) Finally we have some data to back it up. With a bit practice it's easy to pick a few limbs to leave. It's really effective on those tall slender stems, when you are way up...
  6. M

    Rigging Research Part Deux

    Hey Folks, Another article out this month in Arb News... this time looking at the effects of mass/aerodynamic damping in a rigging situation! ;) Much of what we know about damping in the crown comes from wind/tree interaction research, and although much of the work has used a mechanical input...
  7. M

    Rigging research results

    @CutHighnLetFly, Thanks! TCIA was fun! Too bad about the tech issues in that room, were you on the "good side" ;) @Bart_ Yes, rope... ;)
  8. M

    Rigging research results

    @theatertech87 Yes, we ran out of time for the thunder sling... basically had one working day (rig has to come down at end of day) and would be hard to justify going back for one device... also volunteer time etc. I had a triple thimble planned too, but time. ;) As noted, the rope was 9/16...
  9. M

    Rigging research results

    n=20
  10. M

    Rigging research results

    Yes, that's me. That work has been presented in conference, but I've still to write it up. It's a big complex thing that I put effort into for a while, then throw my hands in the air and go do something else. ;) I'm hoping to replicate it this summer with a bit better measures, and less wires...
  11. M

    Rigging research results

    I can't recall # wraps. 2??? maybe. Sorry. there were linear pots... however the resolution with the available bit resolution is too low, but they are a nice back up, and helped ensure linearity of the primary sensor. The primary reading comes from a trade secret... full bridge strain gauge...
  12. M

    Rigging research results

    Ha! More good questions. ;) Fall distance was not measured. I guess I should have for fun, but it was always the same, so not a variable. Same for robot groundie to porta wrap distance. With the block, calculated upper anchor load was ~ 10x static mass, ~6-7x for stationary rings (see "proxy...
  13. M

    Rigging research results

    Forgot to click save! In there now...
  14. M

    Rigging research results

    Hey, sorry I should have included that... it's in the text now. (All this stuff is in way more detail in the articles...) The rope was 9/16 stable braid, the falling piece had a mass of 187 kg Cheers. Matt
  15. M

    Rigging research results

    Keeth, good question, they are "small" but pretty consistent. We have 3 reps for each test, so a total of 12 drops.
  16. M

    Rigging research results

    Good question... in this case I don't think we have the capacity to measure that... the effect would be minuscule. In this project the rope had plenty of time to recover between rigs. Now... if you wanna talk electrical hysteresis on the strain gauges... :) i'm all ears. I think we managed that...
  17. M

    Rigging research results

    oh yeah... here's the robot groundie... maybe a side project in reducing labour costs??? not likely. ;) And just some fun pics from the day...
  18. M

    Rigging research results

    Hi Folks, Long time since I posted here… in fact I was more active on forums many moons ago, not so much anymore. Anyway, I recently had an article published in Arb News, and Mark suggested I post about it here, and indeed it’s good to get the word out on multiple platforms. ;) Some...
  19. M

    A Practical Tree Science Seminar in Seattle June 23.

    After all these years... my first Buzz post... Rog, Love that shot, good times in the PNW! If I had half the understanding of the Young's modulus on those snags I'd say yes, but alas, dead wood is next on my agenda. Can you go back and look for my zipper pull??? I think one of those snags...

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