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  1. #11
    Chesapeake's Avatar
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    I bought whoopies by Nimbus Hammock on Amazon. They are listed as " adjustable from 2'-6', 3 or 4mm UHMWPE with reflective tracers." They came with 2 free soft shackles andcost $22. I put them on my hammock about 2 weeks ago and they are showing wear already! Where the tail exits is turning white, fraying some and fading. Also fraying/fading at top of loop behind my marlin spike. Did I get ripped off? I'm only 165lbs so I'm not overloading them. They just don't seem like they should be breaking down this way already. What are these made of? I'm NOT HAPPY and will replace with Whoopies from a cottage vendor as soon as I'm able to. HELP!!IMG_20160729_180634.jpgIMG_20160806_112914.jpgIMG_20160806_113228.jpgIMG_20160806_113314.jpgIMG_20160806_113500.jpgIMG_20160806_113120.jpgIMG_20160729_192036.jpg First pic is the day I put them on, nice, bright red. Rest are today, faded, fraying and dull. Last two are today pic of soft shackle faded and fraying, followed by day I got them pic.
    Last edited by Chesapeake; 08-06-2016 at 10:41.

  2. #12

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    The coloring of typical UHMWPE ropes is in a surface coating that can wear quickly. I'm not seeing fraying (breaking of fibers) in your photos. I do see strand re-alignment at the bury exits which is normal although your's seems greater than usual. Pulling the adjustable end back on itself to shorten the whoopie will make this worse and is to be avoided.

    Not seeing a big problem here...use them.
    Last edited by gmcttr; 08-06-2016 at 13:55.

  3. #13
    Member Fujibilly's Avatar
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    This is great information! Thanks so much for sharing, Gravity! I just finished my first set of Amsteel Blue whoopies and soft shackles (improved shackles with the choked overhand knot).

  4. #14
    A question, I'm looking at some dyneema line, 2,5mm. It has tear strength listed as 580daN. How do I figure the safe working load from that?

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  5. #15
    That's 580kg.
    Safe working Load (SWL) = break strength / Safety Factor

    You choose what safety factor you are happy with. It seems most folk are happy with 5x SF
    So for this case, SWL = 580/5 = 116kg
    For rescue life loads we use 10x SF.

    --
    Gadget

  6. #16
    Thank you! That is what I thought after reading a bit about it, but I was still a bit confused!

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  7. #17
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    To the guy/Gal asking about safe working loads over 320lbs

    The load isn't shared as you thing. The tension in each rope will be roughly equal if the angles are the same, and that will be equal to the weight. If you are hanging in a perfect triangle with 30° angles. The weight is 100kg X G(9.81) = 981N.

    The tension is calculated by mG =T1xSin30 w T2xSin30

    If the angles are the same and we module the mass as a point loading T1=T2

    Therefore mG=2Tsin30

    mG/2 = TSin30

    T = (mG/2) / Sin30

    T = 490.5 / Sin30 [ Sin30 equal 0.5]

    Therefore the total tension in the ropes is 981N or 100kg (220lb) or your starting weight.

    If you want to know the tension put on the tree, use cos in place of sin and you'll get the "weight" felt by the tree in the horizontal plane.

    If you didn't follow our you think I might have made a mistake, there is a calculator for hammock geometry on the ultimate hang.com


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  8. #18
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    Quote Originally Posted by Ghashul View Post
    A question, I'm looking at some dyneema line, 2,5mm. It has tear strength listed as 580daN. How do I figure the safe working load from that?

    Sent from my ONEPLUS A3003 using Tapatalk
    daN stands for decanewton. Deca means x10 and newton's if a measure of weigh = mass times acceleration of gravity

    580 X 10 = 5800N
    Gravity is 9.81m/s.s
    So to get a safe mass you divide by g

    5800/9.81 = 591kg

    1kg =2.2lbs
    591kg = 1300lbs.


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  9. #19
    Mittagsfrost's Avatar
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    Or, for an approximation: 1 daN is about 1kg is about 2 lbs.
    Omnia vincit lectulus pensilis.

  10. #20
    Senior Member
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    This is a problem i had to get my head around as well.

    If you set your hang up at the recomended angle if 30• the amount of force experienced on EACH rope is slightly more than 100% if the total weight suppirted.

    Thats YOUE weight PLUS the combined weight of the entire rig supported by the hammock suspension lines.

    Some very smart people here have made a hang calculator if you want to calculate this for yourself.

    As your hang angle approached 0• the stresses go up dramatically so you need stronger rope.

    My personal preference is for SK75 or higher in 3mm or 1/8(which is 3.18mm).

    A licjed brummel will also REDUCE the line strength a bit(up to 10% i read) so if you are a dainty wee 130kgs like me then 2.4mm or 7/64 does not give a good safety margin.

    I do hang up trees and on rock ledges so i tend to prefer the 10 times life suppoet guidelines.
    That means that 3mm is still not good enough for the dangerous hangs but perfectly acceptable for standard liw level hangs with clear ground beliw.

    I do have a set of 4mm(1600kgs) dyneema whoppies but the stuff is very bulky and stiff for qyite a long time.

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