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  1. davespencer

    Physics Question

    here is a neat site with a calculator. they figure out the impulse with distace after impact (stretch) instead of time. http://hyperphysics.phy-astr.gsu.edu/hbase/flobi.html#c1" I think this is going to be the best we get, but its not bad. Dave
  2. davespencer

    Real tree men do it like this!

    Not me, although I have certainly done stuff that dumb and dumber in my life. Nobody has been lucky enough to catch it on video yet though. Here is another that will really make you cringe. Dave
  3. davespencer

    Physics Question

    To calculate impact force (known as impulse) I=FxT (impulse=force x time) measured in KN on most equipment The easy part of the equation is Force, the near impossible part is Time. Time would be measured from when the rope goes taught, through all the stretching and deflection, until the...
  4. davespencer

    Real tree men do it like this!

    I got one for y'all
  5. davespencer

    Inscribing gear

    DMM's biners are tested after being marked. That seems like a very dangerous recommendation to mark the spine but not advise a method. Dave
  6. davespencer

    Inscribing gear

    I no longer climb trees for money and have not for a few years now. I am a millwright/industrial rigger and as such have some experience with metalurgy. Have a look at the attached photo of me beside a broken steel tie rod for a large injection mold machine I helped replace. If you look at...
  7. davespencer

    Inscribing gear

    .
  8. davespencer

    Inscribing gear

    I have used an engraving tool on the gate of an autolocking carabiner, No hits on anything structural. It looked really good on red anodizing. I used my computer to print out my friends name in a cool font on a mailing lable, stuck it on the gate and engraved right through the paper for a...
  9. davespencer

    Harm's way

    Re: Harm\'s way It's good to see the climber was not afraid to say no the climb. In the past I have worked with a crane opperator who was able to "catch" steel chokers that I placed in the tree ahead of time, you could set something from the ground. While I wrote this, I came up with another...
  10. davespencer

    ever been wrong? or the sword of Damocles

    About 8 years ago we had a heck of a wind storm blow down a street in our town. It layed a dozen or so mature maple trees across the road and damaged many others. One of the damaged trees is the one pictured in the attachment. I talked with the homeowner and explained tension wood, included...
  11. davespencer

    Make your own friction saver

    that's it Tom. I used to use it way way way back when I footlocked. By cinching the sling to the carabiner it holds it tight and reduces the chance of cross loading. Dave
  12. davespencer

    Make your own friction saver

    Tree spyder just reminded me thath the last pic is called a pile hitch, not a post hitch. Thanks Dave
  13. davespencer

    Make your own friction saver

    Here is another knot you could use to girth. I believe it is called the post hitch in Ashley's. It is nice and secure but unties super easy even after pulling a truck (trust me) Dave
  14. davespencer

    Make your own friction saver

    another pic showing how to start the knot Dave
  15. davespencer

    Make your own friction saver

    Here is another way a rope one might be made better. This is a variation of the double fishermans I came up with a while ago. It allows the bight to be cinched up tight to kill the chance of cross loading. If you put the ring on this end, there would be no knot to pull through a crotch. The...
  16. davespencer

    Make your own friction saver

    Here is a pic of one of my home made friction savers. Hand stitched Dave
  17. davespencer

    toss wand

    i have used guitar string Dave
  18. davespencer

    Make your own friction saver

    I would suggest leaving a longer tail on the biner side and taping it all the way up to form a stiffer section that will pop over crotches. I would worry that your knot will snag easily, costing more in time and money trying to retrieve it than getting a proper fs. Knots on the ring side are...
  19. davespencer

    new addition

    I thought he was teasing me with a pun. I'm not playin "poker" for a while now. Dave
  20. davespencer

    Yesterdays job

    Why did they want the tree down after building addition around it? Trunk looked solid. Nice work Dave

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