Suspension slings

Discussion in 'DIY & MYOG' started by Bob-W, Jun 7, 2020.

  1. Bob-W

    Bob-W Trail Blazer

    This could also have gone in the Hammock Kit forum I suppose:)

    Got 20 metres of 2.5mm Amsteel cord from DD Hammocks and have been making up various loops and slings. Quite therapeutic but rumours that I'm planning to make a fishing net are mere exaggerations :D

    Amsteel/dyneema cord is very slippery and hard to form knots in so splicing is the more common means of joining. Also dyneema has a low melting point and when you cross threads they act in the same way as a weighted wire cutting through ice so the cord can effectively cut itself. The constrictions take most of the load, there's a minimum effective length, but you need to lock things as well and this is done by either a straight splice or a locked Brummel which are basically the cord threaded back through itself a couple of times.

    There's only really three techniques involved: tapering the ends of the cord so it's easy to thread; making the hole to pass the cord through itself; threading the cord inside itself to make the splice/constrictor. I find the first of these the hardest mainly because of my eyesight.

    Started out making some continuous loops as at the top of the photo. Next a dog bone, basically a spliced eye at each end of the line. Then a 1.8m long (needs 3.6m of cord) Whoopie Sling which is an adjustable loop. The washers at mid-left are to stop the adjustable loop being pulled through the constriction which can be seen at centre bottom.


    Total weight of the slings shown is 25g!

    The last thing I've made but it's not shown is a soft shackle - basically a carabiner made out of cord.
    JimH, Teepee, Meadows and 2 others like this.
  2. Shewie

    Shewie Administrator Staff Member

    Good fun isn’t it, not made any whoopies up for a few years as they last so long. My current ones are made from skinny dynaglide which Dutch gave to me, after 5 or 6 years they’re looking a bit sketchy so I’ll probably swap them out before hanging season.
  3. Bob-W

    Bob-W Trail Blazer

    Yeah, appeals to my geekiness!

    Due to my wife commandeering the hammock I bought (TBF it fits her better) we've some fabric on the way to make a hammock for me, she's been doing sewing classes over winter, so I needed to create some continuous loops and the Whoopie Slings anyway. I've only used just over half of the cord so far so about £9 of materials for the two loops and two Whoopie Slings for that.
  4. Meadows

    Meadows Section Hiker

    Nice work. I like the little washer idea, I pilfered my niece's hair beads for mine.
    Are you using straps and toggles?
  5. SafetyThird

    SafetyThird Section Hiker

    I made a few of those a while back with some Amsteel I bought from @Gadget Put continuous loops on the hammock and made a couple of long dog bones as ridge lines. I hadn't spliced anything since I worked offshore in the 90's and that was always much bigger rope :)
  6. Gadget

    Gadget Thru Hiker

    If you want to make other stuff, look up loopie slings and UCRs.
    gixer and SafetyThird like this.
  7. JimH

    JimH Ultralighter

    What do you use for a fid on such a small line?

    I've some 1. 6mm dyneema that I wanted to make soft shackles with but found it really tricky and I'm not very happy with the end results.
  8. Shewie

    Shewie Administrator Staff Member

    I use a piece of thin copper wire from inside a data cable usually
  9. SafetyThird

    SafetyThird Section Hiker

    I use a bit of mig welding wire. I have .6 and .8mm wire. If you'd like a piece I can send you some.
  10. Teepee

    Teepee Thru Hiker

    Mig welding wire too. I have used some stripped out earth core from some ring main with success before.

    Ease of splicing is down the weave of the line too, they all behave differently depending on the number of strands.

    For soft shackles, you don't actually need to splice. The important part is the diamond knot, the restrictor can be made with a sliding scarab knot and it makes them easier to use aswell.
  11. JimH

    JimH Ultralighter

    The sliding knot approach looks interesting, but I guess that doesn't automatically tighten and could shake loose.

    I think my main problem was trying to bury one of the strands until the diamond knot, if I'd gone for a simple loop and kept the 2 strands seperate until the diamond it'd have been simpler.
  12. Teepee

    Teepee Thru Hiker

    Yeah, it doesn't auto tighten but it depends on the use. If the slider is made of something grippy, it doesn't slip much and it's more than fine for hammocks. For fastening things to a pack, then the buried is still better. But, the slider knot makes the soft shackle very easy to use one handed; just hook the big loop over and slide the slider.
  13. Meadows

    Meadows Section Hiker

    Picture hanging wire, not the twisted together stuff works for me on thin cord or a Loop Turner for Amstel.
    The easiest soft shackle I've made is something like an Evo loop but also had success with the 'Tacblades improved soft shackle' end knot, instead of the diamond or button knot.

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