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  1. #1
    krshome's Avatar
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    Another strength of Dynaglide question

    I have some UCR's that are already made and want to add Whoopie hooks to them. If I just girth hitch them on to my spiced loop would that degrade the strength of the Dynaglide any more than just spicing the Whoopie into a loop?

  2. #2
    Mouseskowitz's Avatar
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    According to Samson's Class II Whoopie Sling documentation the rope retains 60% of the original strength. Dynaglide and Amsteel are made from UHMW polyethylene so the numbers should work for both. If I remember right the recommended bend radius is 8 for this type of line. Obviously you're not going to get that with Whoopie hooks, but will it be weaker than your splice? I'm guessing if it is, it won't be by much, but that's just a guess.

  3. #3
    krshome's Avatar
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    I almost feel like it would be stronger with a girth hitch but what do I know.

  4. #4
    Mouseskowitz's Avatar
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    Basically, when you use a knot whatever has the largest bends will be the strongest from a rope compromise point of view. This type of rope has its strength on the long axis and when you bend it too sharply you put the stress on the cross axis putting the rope at risk for failure at that point. To put it another way, figure anytime you tie a knot in Amsteel or Dynaglide you'll cut the strength in half. Hope that makes sense.

  5. #5
    Yoda's Avatar
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    My whoopie hooks are spliced onto my Dynaglide, have been for some time now and I haven't had a issue. I would imagine that the bend radius should be the same no matter which way it is done around the hook itself, but the loop/bend that goes around the dynaglide may end up being too sharp a radius and de-rate the line more than a slipce or knot would.
    Formerly known as "Cranky Bear"....

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  6. #6
    Senior Member DemostiX's Avatar
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    Share the load between multiple points of strain and you'll find lower probability of failure. That's why it matters, if you will approach the limits of a line's strength that you carefully tighten the knots. it is also why million of anglers have settled on bends like the Bimini.

    So, yes, the girth hitch is superior. But, if you are depending on that marginal difference, you should be using stronger cord. Do what is neat and tidy.

    ----------

    On this subject of bend and knot strength, I have been looking for reports anywhere on a modified Rosenthal or Zeppelin bend, eg http://www.animatedknots.com/zeppelin/ ,
    where the modification consists only of increasing the number of times the cord passes through a loop. The reason for the small additional trouble is to increase the radius of all loops in the Bend, for my purposes to make a stronger stopper knot.

  7. #7
    krshome's Avatar
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    Thanks guys. I decided to just unspiced the line and added the whoopie hook to the loop. Better safe than dead.

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