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Thread: How a string loses it's tension?
05-25-2011, 09:45 PM #1
How a string loses it's tension?
As the title stated, how does a badminton strings actually loses it's tension? A few days ago, i went for a badminton session. After some few clears, i found that my racket had some abnormal feel. It requires a slightly more strength to perform the clear.
My questions is,
Does putting a racket in a cold place (like in an air-conditional room) or a hot place would affect the strings tension?
Thx u and have a nice day!!
05-25-2011, 10:07 PM #2
We don't live in a physically ideal world so most badminton strings which are made of high polymer strands woven together will of course stretch, become longer and lose tension over time and after repeated impact stresses.
What you experienced is hard to quantify. What string and tension were you using?
Lastly temperature does not change the string tension a lot. The most I have experienced is 0.5lbs tension increase at a 20 degree celsius hall on a racquet strung at 28 degree celsius. The feel is not that significant anyway.
05-25-2011, 11:04 PM #3
string is BG65
05-25-2011, 11:23 PM #4
What machine was your racquet done with?
05-26-2011, 01:16 AM #5
so, the conclusion is the string's tension more or less will be affected by the weather, the stringing machines that we uses and the person who did the stringing?
05-26-2011, 04:48 AM #6
IME rackets do play slightly "tighter" in colder conditions, but it's something you can adjust to very easily; over "normal" temperatures it would never be a full pound.
05-26-2011, 06:51 AM #7
I personally have never noticed a difference, when I can't hit a full court clear well it is usually a result of playing badly, which is usually a result of being tired or not warming up properly
One way to find out would be to try playing in a very warm environment, like outside (not ideal I know) in a tropical country and then go into an air conditioned hall and continue to play and see if you notice a difference.
05-26-2011, 11:17 AM #8
My findings are based on string sound and net play only, but you're definitely right that it can't be judged on power shots because the shuttle speed would completely override any perceived string effects.
Last edited by Mark A; 05-26-2011 at 11:20 AM.
05-26-2011, 04:05 PM #9
05-26-2011, 06:10 PM #10
relative pitch) and the feel of the shuttle impact as I am sensitive to these high tensions
Unfortunately the 32lbs racquet has dropped to 30lbs now. It is also strung with BG65 and the feel of it now is totally different than when freshly strung
05-26-2011, 06:50 PM #11
You don't need relative or absolute pitch if you have an iPhone and this handy little app called "Cleartune", which meausures the string frequency when you strum the stringbed.
From my experience, a 50 Hz change is equivalent to 1 lb difference on ZM67 strings. YMMV.
And yes, I notice a 1 lb change for every 5 degree Celsius change in the ambient temperature.
Last edited by visor; 05-26-2011 at 06:52 PM.
05-26-2011, 07:31 PM #12
Besides I had been trained in relative pitch and absolute pitch before when I studied music and I am only just applying my knowledge in this practical sense.
The highest change I have experienced is only slightly close to 0.5lbs with Bg65 at 5 degree Celsius change and it was almost not noticable.
05-27-2011, 10:03 AM #13
wow. you guys are so amazing!!
does this mean that if you were given, say 5 pre-strung rackets at different tensions - same string, and you know the tension of one of them, you can use relative (or absolute) pitch analysis to determine accurately the tension of each racket?
05-27-2011, 10:55 AM #14
05-27-2011, 11:09 AM #15
Let's say strung at 20, 22, 25, 27, 29 lbs - but you don't know what each racket is strung at. You won't even know the range of tensions.
So you say you can identify each tension of the racket? Accurate to 1lb?
Most of the stringers I know can only guesstimate what a racket tension is at - at any time. here we have a few people so confident they can identify racket tension accurate upto 1 lb.
..or is it accurate to 0.5lbs?
Last edited by tenchi; 05-27-2011 at 11:11 AM.
05-27-2011, 11:46 AM #16
The pitch is independent of different frames, as long as they're all isometric. It is only dependent on string thickness and temperature.
I have various brands of rackets with the same string and at the same tension, they all have the same pitch initially which drops by about 100 hz over a week with use.
If you don't believe me, just ask your stringer. They have the experience. As a matter of fact, they will always strum the stringbed after stringing a racket to check the tension.
05-27-2011, 11:51 AM #17
I do not have anything to verify the pitch of my stringbed, so maybe the pitch produced is about the same, but the sound produced is somewhat different. I know I get different sounds for different rackets with the same tension and string most of the time though.
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