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  1. davespencer

    amazing electronic rope

    check out this link! http://www.cnn.com/2005/TECH/07/28/spark.rope/index.html pretty soon we will have dynamometers built into all of our ropes. Dave
  2. davespencer

    What's With the "Search" Feature

    Re: What\'s With the \"Search\" Feature but it's simple (like me) Dave
  3. davespencer

    What's With the "Search" Feature

    Re: What\'s With the \"Search\" Feature When I log onto treebuzz I just hit the last 24 hours of new messages. I get a list of search results and click a link. After reading the post I hit the back button to show the search results again. About 20% of the time, I get the try again later...
  4. davespencer

    First Timer

    how long ago was the retaining wall put in? Dave
  5. davespencer

    More uses for lasers

    Just found this on the net http://downloads.oreilly.com/make/laserfun.mov just shows the laser popping ballons instantly and through plastic cups. I'm not sure what the last thing is. Dave
  6. davespencer

    Setting up a zip line

    [ QUOTE ] [ QUOTE ] You seem to be forgetting that if you have 10 ft of slack in the zipline 100 ft long, that will drop another 15 ft down when a person is on it. this changes the angles and forces quite a bit. [/ QUOTE ] Not forgetting such an obvious thing, but perhaps I wasn't clear. The...
  7. davespencer

    Gibbs vs prusik

    [ QUOTE ] Attached is a picture of a brand new open-shell ascender (designed for one-person use) which severed a brand new rescue rope and partially opened the shell. This ascender was used as the haul grab in a raising system with a litter and attendent on the working end. [/ QUOTE ] So...
  8. davespencer

    Setting up a zip line

    [ QUOTE ] Yes way, if you want to maintain a 10:1 safety factor. I double checked my references, though, and that ratio is for an 11mm (7/6") rope. With 1/2" rope, you can get away with a 6% sag (assuming a load of 200 lbs). - Robert [/ QUOTE ] I met guys that did a one mile zipline...
  9. davespencer

    Setting up a zip line

    [ QUOTE ] [ QUOTE ] show the people backing out pictures of highlines from this thread and offer them a ride! [/ QUOTE ] What does "people backing out pictures of highlines" mean? [/ QUOTE ] sorry it was not clear, "people backing out" were the people who changed their minds on allowing...
  10. davespencer

    Setting up a zip line

    [ QUOTE ] [ QUOTE ] how much of an angle should be created between the trees? [/ QUOTE ] Unless you know how to calculate the forces on a high-line, a good rule of thumb is to maintain a 1:10 sag ratio - a deflection from a straight line of 1/10 of the length between anchors with the expected...
  11. davespencer

    Setting up a zip line

    Re: Let\'s have some fun! [ QUOTE ] Dave, thanks for the input. The original plan was to have the pulley overhead, a maybe 3'-4' sling from pulley to the harness, and the snap shackle at the harness so the shackle would come with you. We originally planned on hanging a carabiner from the end...
  12. davespencer

    Setting up a zip line

    Re: Let\'s have some fun! depending on the steepness of the ride, be cautious of speed and the potential to skip across the water. Hate to land in a good spot only to bounce onto the shore. To avoid the face smack, have the snap shackle at face level. Shackle goes down, conection goes up...
  13. davespencer

    Zipline video (38 second movie)

    I have always done ziplines with a longer tether so it is impossible to catch fingers and hair in the pulley. This is because I have seen the results of that first hand. Even after people have been warned. Cool though Dave
  14. davespencer

    splicing workshop

    Brion and I hung out for a bit at TCI a few years back. Tom and I took him to a rec climb after the show. He would understand the basics of climbing for sure. After being at the show he probably knows a little bit about the type of rigging we do too. My favorite thing I learned from him was...
  15. davespencer

    London bombing

    [ QUOTE ] And that is EXACTLY their mindset! [/ QUOTE ] So who are "they"? All muslims? I know a few muslims who practice Islam. They do not want to convert me or kill me in the name of allah. They were shocked and embarassed by 9-11 and the other terrorist acts done in the name of...
  16. davespencer

    London bombing

    "Witches" were burned in Salem in 1692 for not being christian, that is less than 1000 years ago, by your recconing, that still gives muslims about 200 years to catch up. IRA bomings were done under the guise of religion, Bosnia was 3 side divided by religion. Religion kills people every day...
  17. davespencer

    London bombing

    I don't believe a thing the media says after I did a tour in Bosnia. When nothing was happening in our area, my parents were besides themselves watching the news about the horrors going on. When the sh!& was hitting the fan, there was no coverage on the news. Don't fault Glen for...
  18. davespencer

    reverse MA

    [ QUOTE ] When I first thought that, I thought, you would break the rope if you were to stall out truck. thats a lot of force. Thinking about it, I don't think you would, as all you are putting on a single line would still be my wieght only. What would it take? a 1 to 30? what would that...
  19. davespencer

    Wish me luck

    in all seriousness, can the shed be moved so no rigging is required? let the stuff fly. nasty tree. stay tied in to the branches with a little green on them. I guess a crane is not in the price? Dave
  20. davespencer

    Your personal SRT work setup

    Kevin, If you fell 6 inches, which looks reasonable with your setup, you could easily put more than 500 lbs of force on your snap. If you dont believe me just bounce on your bathroom scale and watch it bottom out, then picture a 6 inch fall. Backups need to be treated as life support...

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