User Tag List

Results 1 to 11 of 11
  1. #1
    Regular Member
    Join Date
    Jun 2012
    Location
    Milton, Canada
    Posts
    66
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Pre-stretch vs +1lb

    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. #2
    Regular Member
    Join Date
    Jun 2004
    Location
    London, UK
    Posts
    1,113
    Post Thanks / Like
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)

    Default

    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. #3
    Regular Member Mark A's Avatar
    Join Date
    Sep 2005
    Location
    St Helens, UK
    Posts
    3,737
    Post Thanks / Like
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by abans View Post
    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.
    Prestretch and extra tension have different effects:

    Name:  graph.png
Views: 229
Size:  19.4 KB

    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.
    Last edited by Mark A; 02-12-2014 at 04:05 PM.

  4. Likes Zoidius, Fidget liked this post
  5. #4
    Regular Member
    Join Date
    Jan 2012
    Location
    Germany
    Posts
    624
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default

    Now your picture makes some sense :P

    But all this is just based on theoretical calculations and not experimental data right?

  6. #5
    Regular Member Mark A's Avatar
    Join Date
    Sep 2005
    Location
    St Helens, UK
    Posts
    3,737
    Post Thanks / Like
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by phili View Post
    Now your picture makes some sense :P

    But all this is just based on theoretical calculations and not experimental data right?
    Mainly based on experience, but I have taken some frequency measurements of string jobs as they have aged.

  7. #6
    Regular Member
    Join Date
    Mar 2008
    Location
    Canada
    Posts
    2,766
    Post Thanks / Like
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Mark A View Post
    Mainly based on experience, but I have taken some frequency measurements of string jobs as they have aged.
    That graph is a nice way of understanding things. Thank goodness for the fanatically precise among us!

  8. #7
    Regular Member visor's Avatar
    Join Date
    Dec 2009
    Location
    Vancouver, BC
    Posts
    8,591
    Post Thanks / Like
    Mentioned
    84 Post(s)
    Tagged
    1 Thread(s)

    Default

    Quote Originally Posted by Mark A View Post
    Prestretch and extra tension have different effects:

    Name:  graph.png
Views: 229
Size:  19.4 KB

    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.
    ummm... i suppose horizontal axis is time and 0 is when stringing is finished... so what does -2, -1 mean on that axis?
    Last edited by visor; 02-12-2014 at 07:42 PM.

  9. #8
    Regular Member Mark A's Avatar
    Join Date
    Sep 2005
    Location
    St Helens, UK
    Posts
    3,737
    Post Thanks / Like
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by visor View Post
    ummm... i suppose horizontal axis is time and 0 is when stringing is finished... so what does -2, -1 mean on that axis?
    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.

  10. Likes visor liked this post
  11. #9
    Regular Member clawhammers's Avatar
    Join Date
    Oct 2011
    Location
    Jakarta
    Posts
    665
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default

    Name:  pugcx.jpg
Views: 165
Size:  46.8 KB


    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.
    Last edited by clawhammers; 02-13-2014 at 04:07 AM.

  12. #10
    Regular Member
    Join Date
    Sep 2009
    Location
    Midwest USA
    Posts
    256
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default

    @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.

  13. #11
    Regular Member visor's Avatar
    Join Date
    Dec 2009
    Location
    Vancouver, BC
    Posts
    8,591
    Post Thanks / Like
    Mentioned
    84 Post(s)
    Tagged
    1 Thread(s)

    Default

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

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •