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Pre-stretch vs +1lb

Discussion in 'Badminton String' started by abans, Feb 12, 2014.

  1. abans

    abans Regular Member

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    I was trying to get ngy99 at 26lbs with some prestretch on my racket. The stringer didn't know how to prestretch (yes I know I need to find a better stringer).
    The question I have is would increasing the tension to 27lbs give the same effect?
    And yes I am looking for some good stringer reccos in the Toronto /hat region. Please pm me if your a stringer or know a good person.
     
  2. R20190

    R20190 Regular Member

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    NBG99 is one of the best tension holding strings Yonex make. I prestretch mine but to be honest, it doesn't seem to make much difference. Whereas on strings like BG65Ti, it does seem to make a bit of a difference.

    If you can tolerate 27lb then I say go for it. All strings lose tension, but NBG99 retains it quite well.

    I'm currently playing with NBG99 on most of my racquets at 31lb and over the first few weeks it only seem to drop by a very small amount, perhaps 1-2lb. And then it settles quickly and maintains that tension for the life of the string.
     
  3. Mark A

    Mark A Regular Member

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    Prestretch and extra tension have different effects:

    graph.png

    If the blue curve represents the default tension with no prestretch, the red curve shows what happens if you add 1 lb, and the green curve shows the default tension with prestretch.

    As you can see, presretch doesn't affect the steady-state tension - the horizontal limit of the curve - it just slows the rate of loss.
     
    #3 Mark A, Feb 12, 2014
    Last edited: Feb 12, 2014
  4. phili

    phili Regular Member

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    Now your picture makes some sense :p

    But all this is just based on theoretical calculations and not experimental data right?
     
  5. Mark A

    Mark A Regular Member

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    Mainly based on experience, but I have taken some frequency measurements of string jobs as they have aged.
     
  6. Fidget

    Fidget Regular Member

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    That graph is a nice way of understanding things. Thank goodness for the fanatically precise among us!
     
  7. visor

    visor Regular Member

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    ummm... i suppose horizontal axis is time and 0 is when stringing is finished... so what does -2, -1 mean on that axis?
     
    #7 visor, Feb 12, 2014
    Last edited: Feb 12, 2014
  8. Mark A

    Mark A Regular Member

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    It means I couldn't be bothered to specify that the graph should start at zero time.

    Or what would happen to the racket if you took it back in time - up to you:p.
     
  9. clawhammers

    clawhammers Regular Member

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    pugcx.jpg


    This another example from a Japanese stringer, who performed research on tension loss of NBG 99

    Initial setup = 25 lbs

    Term of period = 16 days

    ps. : I don't understand Japanese language, and the above information is merely based on my personal / logical interpretation. :p
     
    #9 clawhammers, Feb 13, 2014
    Last edited: Feb 13, 2014
  10. mater

    mater Regular Member

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    @clawhammer , if I am looking at the data correctly, it looks like the tension went from 100% right off the stringing machine to ~93% one day later, and 85% at day 8 and down to ~82% at day 16.

    The limited info seems to match the thought that one should let a freshly strung racket 'rest' at the very least one day and up to about a week before bringing out to play, due to letting the string and tension stabilize.

    @abans , as Mark A posted earlier, higher tension is different from pre-stretching to remove some elasticity. If you haven't yet, try posting in the regional sub-forums and ask there for a recommendation for a stringer. You might have better luck.
     
  11. visor

    visor Regular Member

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    Interesting. I wonder what and how they monitor the stringbed tension? And I assume that also includes playing time too?
     

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