Max Tension for yonex strings.

Discussion in 'Badminton Stringing Techniques & Tools' started by Sgbad, Mar 3, 2008.

  1. Sgbad

    Sgbad Regular Member

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    Hi fellow stringers,
    I have always wondered, whats the maximum tension for yonex strings? Pros they string it at 30+ lbs. Wont the strings break upon pulling at such high tension? Any idea what is the maximum tensions of the yonex strings? Does different models of string (bg66, bg68ti etc) have different creep?
     
  2. wocdam

    wocdam Regular Member

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    different creep, definitely yes. due to different thickness and different layers of materials. (i'm only saying this purely based on engineering point of view)
     
  3. Sgbad

    Sgbad Regular Member

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    So any idea, at what tensions does the different strings break? bg66,bg65,bg80 etc.
     
  4. Matt

    Matt Regular Member

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    Well, the pros do have multiple rackets so they do switch to another time to time as they break their strings during the match because of the high tension.
     
  5. Mark A

    Mark A Regular Member

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    For what it's worth, I have noticed that Vectran strings tend to break before non-Vectran ones. For example, my BG-80 tends to go as far as 32/33 before it goes, while I've had BG-65Ti up to 35. I have read that Martin Lundgaard uses BG-80 at 35lbs, though:eek:.

    In my limited experience with Nanogys, they tend to fall in between Ti and Vectrans.
     
  6. ph_leung

    ph_leung Regular Member

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    There are many factors that affect when the strings break that aren't related to the strings itself.

    In an absolute case, if the string were held in the least damaging way (probably wound up instead of clamped), the tensions should be very high. I'm going to guess in excess of 40lbs for some of the thicker 0.68mm-0.70mm strings. The problem occurs when you factor in damage from non-perfect grommets, clamps, tensioner's grippers,etc.

    I strung up my racket yesterday with Tactic TG-80 0.69mm at ~32/34.5lbs. The string looks fine. If I can get some cheap BG-80 or BG-70 I will to try 38-40lbs just for the fun of it.
     
  7. azn_123

    azn_123 Regular Member

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    Which racquet did you string the ~32/24.5lbs tension with?
     
  8. Matt

    Matt Regular Member

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    ROFL! the racket would be already broken and turned into a balll! :D
     
  9. Mark A

    Mark A Regular Member

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    A very good point. If you simply put a scrap of brand new string into your machine for testing, you will almost certainly end up with a higher breaking strain than if you've already pulled ten mains through mashed up grommets.
     
  10. ph_leung

    ph_leung Regular Member

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    Actually, the racket can hold that misquoted combo. I tried it. It wasn't more than 1cm out of shape.

    32/34.5 was on my Carlton Powerblade SL. I found I didn't like TG-80 so I used my last pack to string my PB Ti at 33/36 yesterday just to see what would happen.

    I tested two pieces of used and stretched 0.66mm string. I wound up the ends onto my Berkley scale but used the normal clamping method on the tensioner (BB clamp on a crank tensioner).

    Gosen Pro 66 went up to 38lbs but the outer jacket cracked.
    Yonex BG-66 went up to 38lbs and there was no visible damage.
     
  11. azn_123

    azn_123 Regular Member

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    Is it possible to see how the NBG strings compare to the Gosen Pro 66 and the Yonex BG-66?
     
  12. Matt

    Matt Regular Member

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    I guss that is true, but how long could it hold like that. Seems a bit risky isn't it?
     
  13. Pete LSD

    Pete LSD Regular Member

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    Gosen Pro 66 is quite a stiff string at 30 lbs and brittle too.

    Just curious. What is the drop in tension after lockout? I notice about 3 lbs (ball park figure) after lockout if I didn't adjust the tensioner.

     
    #13 Pete LSD, Mar 16, 2008
    Last edited: Mar 16, 2008
  14. ph_leung

    ph_leung Regular Member

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    These are the only combos I've tried. The length of string is roughly the length of a one of the central mains.

    At 36lb after one minute:
    TG-80 (milkly coloured version) 7lbs drop if not prestretched.
    Pro 66 (white) 6lbs on a well stretched piece.

    After seeing this I wondered what the pros really prefer. What I mean is LCW preferred BG-66 at these high tensions but I think some of the machines they use at the tournaments may not be constant pull. Could the true tension that they prefer really be closer to 30lbs?
     
  15. Pete LSD

    Pete LSD Regular Member

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    The major tournaments have electronic stringing machines, such as Yonex ES5 Pro. If LCW requests 31 lbs, he gets 31 lbs.

     
  16. wocdam

    wocdam Regular Member

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    BG66 at 31 lbs is something i wouldn't think of, simply too fragile. no wonder LCW breaks his strings so regularly.
     
  17. ph_leung

    ph_leung Regular Member

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    Ah, lucky pros. I'll have to try to ask for a sample ES5 to take if I get a chance. :)

    Only thing that still makes me wonder, not having used an CP electric, is if the clamping takes place lets say 10 seconds after pulling, that still leaves lots of time for the string to stretch. When I pulled the strings to test, most of the drop off occured in the first half minute or so but it continued at least up to a minute. This was even with a pre-stretched piece.

    I'm trying a guess at how long they pull, maybe you or someone have witnessed the pro stringers. Do the CP machines do something with the pulling that I'm overlooking? Do they (the stringers) over pull and let them drop afterwards for quickness?
     
  18. DinkAlot

    DinkAlot dcbadminton
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    From my experience, here are the relative limits on a constant pull machine (crank add 3lbs.):

    BG66: up to 32lbs.
    BG85: up to 32lbs.
    BG80: up to 35lbs.
    BG68Ti: up to 35lbs.
    BG65: 35+lbs.
    BG65Ti: 35+lbs.
    BG70: 35+lbs.
     
  19. Pete LSD

    Pete LSD Regular Member

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    Actually, all electronic stringing machines will do pre-stretch and constant pull. You don't have to find a Yonex ES5 Pro. A Victor C-7030, Exthree AM-600, Babolat Star 5, . . . , etc. are able to do the job.

    Yes, if the pre-stretch function is turned on, the machine will pull above the set reference tension. Afterward, the tensioner slowly lowers to the reference tension. The entire process takes about 10 seconds.

     
  20. DinkAlot

    DinkAlot dcbadminton
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    I'm so tempted, it's all your fault Mr. LSD! :p
     

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