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  1. #1
    Senior Member TeeDee's Avatar
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    Talking Non-finicky UCR suspension

    I seem to have gotten this silicone tubing stuck in my mind the past few days. Today another use for the tubing popped into my mind for use in making a UCR that is as easy to use as the Whoopie Slings.

    So I decided to try the idea and see if it worked.

    Works great.

    The problem with the UCR: the unloaded end of the bury doesn't grip completely and so the UCR slips when loaded.

    Various idea have been devised to loading the unloaded end using a Prussic knot and they work. My problem with the Prussic is that it is another part of the UCR that needs to be adjusted. Not a big problem, but just more wheedle factor when compared to the Whoopie Sling which is super simple to use and rock solid.

    My idea: Slip some silicone tubing over the UCR constrictor bury to squeeze the constrictor on the unloaded end. This should keep that portion of the constrictor tight against the buried cord and thus the constrictor should grip immediately when loaded. Of course the silicone tubing must be sized so that it squeezes the constrictor sufficiently without hindering adjustment.

    I have some 0.25" OD x 0.125" ID silicone tubing that works well with the 2 mm Dynaglide. It squeezes a bury well without squeezing too much.

    So I used a 7" length of the silicone tubing and made up a UCR with the tubing on the unloaded end of the constrictor:


    Wrapped for packing:


    Specs:

    cord: 2 mm Dynaglide
    length of constrictor: 16" before bury, 12" after bury.
    length of silicone tubing: 7"
    Total weight including 2 Ti toggles: 0.90 oz (26 g)
    Maximum extension: 6' 1"
    minimum extension: 25"
    fixed eye bury length: 6"

    Took the Whoopie sling off one end of my suspension in the basement hammock lab and installed the new UCR. Easy installation.

    Adjusted the UCR for proper suspension length for proper sag and smoothed out the constrictor outside of the silicone tubing. Adjustment was easy and quick. As easy as the Whoopie Sling.

    Hung Bridge Hammock from suspension and gently got into the Bridge. I say gently since the UCR bury is only 12", which in the past was very inadequate and slipped no matter what, and because I was concerned hanging from that very small single Dynaglide line.

    No slip whatsoever as I got into the Bridge. Moved around gently to test for slip - none whatsoever.

    My verdict: this method of constructing a UCR is as easy to use as a Whoopie sling and just as solid with no slip whatsoever thus far.

    Pros:
    1. lighter than a Whoopie Sling of equivalent extension.
    2. as easy to use as a Whoopie Sling
    3. No slip just as the Whoopie Sling
    4. No extra knots to adjust. Adjust the length and smooth the constrictor outside of the tubing. The tubing keeps the constrictor tight against the buried cord so it grips immediately.


    Cons:
    1. many times harder and much more time consuming to make than a Whoopie Sling. After doing the first one, I could make more in less time than the first, but still much longer than a Whoopie Sling. The reason it is som much harder to construct: you have to make the bury splice with the tubing over the constrictor portion and so you are trying to run the splicing tool down the middle of the cord which is in the middle of the tubing. Not an easy task. Having done the first one, I learned a few tricks that should make the rest a little easier, but it is still darned hard to do.


    I suppose I could and should do more experimentation to determine the proper amount of tubing to use. I just took a SWAG and used 7". That length worked, but maybe less would also. Less would make constructing the UCR easier.

    If I was a SUL person, then this UCR construction method would be my suspension of choice.

    Call it TeeDee's UCR

    Feel free to use it you want to try making them.
    Those who sacrifice freedom for safety, have neither.

    Do not dig your grave with your teeth. (Unknown)

  2. #2
    Oh-No's Avatar
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    Very nice TeeDee, thanks for sharing.
    I like your integrated captive toggles as well.

  3. #3
    Senior Member Bleemus's Avatar
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    Nice work! Looks real slick.

    I use a 10 inch bury on my Whoopies and they haven't slipped yet.

    Now I have to find a piece of wood to knock on!
    Bleemus

    Yes, I sleep in a hammock. Please pass the Grey Poupon.

  4. #4
    Senior Member SGT Rock's Avatar
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    Interesting. Where does one get this tube?
    NO SNIVELING!
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  5. #5
    Senior Member TeeDee's Avatar
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    Quote Originally Posted by SGT Rock View Post
    Interesting. Where does one get this tube?
    McMaster-Carr. Also medical supply places should have it, I believe.
    Those who sacrifice freedom for safety, have neither.

    Do not dig your grave with your teeth. (Unknown)

  6. #6
    Senior Member SGT Rock's Avatar
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    Is this like IV tubing?
    NO SNIVELING!
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  7. #7
    Senior Member TeeDee's Avatar
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    Quote Originally Posted by Bleemus View Post
    Nice work! Looks real slick.

    I use a 10 inch bury on my Whoopies and they haven't slipped yet.

    Now I have to find a piece of wood to knock on!
    When I first tested the UCR back when they were introduced, I tried various bury lengths, from 12" to 18". If I remember correctly I could get the UCR to hold at 14" minimum with a lot of work to get the unloaded end loaded. Less than 14" for me was no good no matter what.

    I didn't really know how long to make the constrictor before making the bury, so just made a wild guess at 16" and hoped it would end up long enough after the bury.

    I was really surprised this one held at 12" given the trouble I had in the past with the UCR. I think that maybe the tubing helped a lot in the shorter bury holding.
    Those who sacrifice freedom for safety, have neither.

    Do not dig your grave with your teeth. (Unknown)

  8. #8
    Senior Member TeeDee's Avatar
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    Quote Originally Posted by SGT Rock View Post
    Is this like IV tubing?
    I doubt it. The IV tubing I have had used on me is nothing like the silicone tubing I have. I think the IV tubing that has always been used on me is medical grade vinyl. The IV tubing is clear, the silicone tubing is cloudy. The silicone tubing is a whole lot more flexible and much, much, much softer and has a "tacky" exterior. The exterior feels like that stuff they use on pens so that you can grip them.
    Those who sacrifice freedom for safety, have neither.

    Do not dig your grave with your teeth. (Unknown)

  9. #9
    Senior Member ikemouser's Avatar
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    Whats the advantage to this vs a whoppie of similar length? Less line?

  10. #10
    Senior Member SGT Rock's Avatar
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    I'll have to go see if I can find some.
    NO SNIVELING!
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