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Thread: Pre-stretch vs +1lb
02-12-2014, 08:06 AM #1
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.
02-12-2014, 10:32 AM #2
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.
02-12-2014, 03:51 PM #3
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.
02-12-2014, 04:28 PM #4
Now your picture makes some sense :P
But all this is just based on theoretical calculations and not experimental data right?
02-12-2014, 04:39 PM #5
02-12-2014, 05:57 PM #6
02-12-2014, 07:39 PM #7
02-13-2014, 02:44 AM #8
visor liked this post
02-13-2014, 03:56 AM #9
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.
02-13-2014, 06:29 AM #10
@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.
02-13-2014, 10:45 AM #11
Interesting. I wonder what and how they monitor the stringbed tension? And I assume that also includes playing time too?