How should I string up kevlar / ZX?

Discussion in 'Strings' started by Torres, Oct 24, 2013.

  1. Torres

    Torres Banned

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    My Ashaway Kevlar 18 has arrived. How should I string it up tension wise with ZX16?

    I usually string at the following tensions:

    Poly - Black Magic 17, 52lbs CP
    Poly - Cyclone 16, 52lbs CP
    Poly hybrid - Black magic 17 / ZX16, 52/54lbs CP
    Zyex - ZX16 53lbs CP at 50% pull speed
     
    Last edited: Oct 24, 2013
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  2. Sander001

    Sander001 Hall of Fame

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    I don't know but I'm curious why you're going for that combo. I use Kevlar from time to time and have some ZX en route so I was wondering what we can do...
     
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  3. corners

    corners Legend

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    I'd take a look at what travlerajm has been doing, although he uses massive sticks so you'd probably want to drop tension a little from where he's at.
     
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  4. Torres

    Torres Banned

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    Just want to know whether I'm supposed to string the Kevlar significantly higher, lower or about the same and suggestions for tension differentials if any...
     
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  5. corners

    corners Legend

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    Trav is doing his own thing with a big differential now, and also pre-stretching the crap out of the ZX, so maybe not so good a reference at this point (but his first couple attempts before moving in the current direction might be worth looking up). I would not think a differential is necessary. The Kevlar is going to be about four times as stiff as the ZX, and having a stiffer mainstring is, in theory, good for snapback-generated spin. I would say drop the tension a little ways from whatever you've settled on with copoly/ZX hybrids, as the dynamics of the stringbed will be similar, but for the fact that the kevlar will be much stiffer than the copoly. This stiffness means that the mains will not slide sideways as far as the copoly in a copoly/ZX setup would do if strung at the same tensions. The stringbed will also have a harder feel due to the rigidity of the kevlar mains. I hate to give you a number lest I lead you into a junky stringbed, but maybe drop both strings by 5 pounds from copoly ZX.
     
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  6. purple-n-gold

    purple-n-gold Professional

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    depends on your frame, in a APD or PD where i would string full poly at 60lbs,, I strung my kevlar/poly hybrids at 50lbs and finally went down to 45lb kev mains with that hybrid and frame. On my Yonex 100, 5lbs less, with poly(55lb) or kevlar(40lb) felt like the right tension for me.
     
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  7. travlerajm

    travlerajm Hall of Fame

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    I don't want to specify a number either. But I highly recommend pre-stretching the ZX in order to get stable stringbed characteristics for evaluation. If you tie one end of a 20-ft segment to a rigid support, and tie the other end to a handle, then lean with your body weight, you can stretch the ZX segment until the relaxed length grows by about 20". That 20" corresponds with about 30 lbs of tension loss. For comparison, poly grows by 4-6" when I prestretch with this method. Nylon grows by 4". Kevlar grows by 2". So ZX loses tension much more rapidly than other strings during the first week of hitting if you don't prestretch.

    I'd also recommend using the kevlar mains at least 10 lbs tighter than the ZX crosses. The ZX is not quite as slick as poly, so this differential will ensure that the stringbed doesn't lock (and also compensates for the initial tension loss in the kevlar).

    On tension, my personal preference is to use a slightly higher average tension than I do with poly. If it's too low, it will feel too springy, and control suffers. If it's too high, the power may be too low.
     
    Last edited: Oct 27, 2013
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  8. Bud

    Bud Bionic Poster

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    ZX mains at 50, Kevlar crosses at 40
     
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  9. Torres

    Torres Banned

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    Thanks for the suggestion.

    So if string poly at 52lbs CP, a slightly higher tension would be 53lbs, making Kevlar/ZX say 58lbs/48lbs? Or should increase the differential more and go 60/48 or 58/46? Isn't 60lbs going to be super stiff?

    Do you know roughly how much tension kevlar loses post stringing? And are your tensions on a CP or a LO machine?
     
    Last edited: Oct 27, 2013
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  10. corners

    corners Legend

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    I'd break that in ten minutes. The tender ZX grinding along the rough, braided Kevlar. The other way around, sir.
     
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  11. corners

    corners Legend

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    I think Trav is using a dropweight. And I think, not sure, he was saying raise tension with Kevlar/ZX from where you would string poly in a full bed.
     
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  12. Dimcorner

    Dimcorner Professional

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    On my APD I strung up Ashaway Kevlar at 48 main and ZX pre-stretched at 48 cross. So far so good. Definitely low powered but very good spin so far.
     
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