# Thread: CONTEST: Guess the tension loss (with MORE PRIZE!!!)

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How you gonna measure the tension on B9 after you tension the string in both cases.

2. Originally Posted by Udonming
How you gonna measure the tension on B9 after you tension the string in both cases.
wait for the video later today. that will clarify the method.

3. Do I understand this correctly - a test to see if pulling the second cross, and leaving out the first, results in tension loss on the second cross?

My guesses, for the record, are 29.6 and 28.6, but I am interested in the result (if I've gleaned the correct meaning).

4. Originally Posted by Mark A
Do I understand this correctly - a test to see if pulling the second cross, and leaving out the first, results in tension loss on the second cross?
that's the motivation.

and i think you mean, "if pulling the second cross, and leaving out the first, results in tension loss on the first cross" ?

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According to some of the studies and forum posts I've seen, pulling a string with a 15 degrees angle (which usually happens when you can rotate your turn table 360 degrees) causes a 5-7% tension loss due to the friction with the grommet.

The friction with main strings is also another ~5% tension loss. Considering the friction is happening on 2 strings at the same time for the double pull, there would be about 15% tension loss total. That is just what I've read and mostly applies to tennis so take it with a grain of salt.

Also, I thought this would be a good place to discuss the resultant tension after a pull, but if you don't agree, please delete this post :P
Last edited by yan.v; 03-21-2012 at 06:10 PM.

6. Originally Posted by kwun
that's the motivation.

and i think you mean, "if pulling the second cross, and leaving out the first, results in tension loss on the first cross" ?
Thinking on, both crosses would probably suffer - they both experience twice the usual friction on a single pull. I've avoided double-pulling for this very reason, so it'd be nice to see if I'm right (and, if so, by how much).

7. Originally Posted by yan.v
According to some of the studies and forum posts I've seen, pulling a string with a 15 degrees angle (which usually happens when you can rotate 360 degrees) causes a 5-7% tension loss due to the friction with the grommet.

The friction with main strings is also another *~5% tension loss. Considering the friction is happening on 2 strings at the same time for the double pull, there would be about 15% tension loss total. That is just what I've read and mostly applies to tennis so take it with a grain of salt.

Also, I thought this would be a good place to discuss the resultant tension after a pull, but if you don't agree, please delete this post :P
feel free to discuss!

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1)29
2)27,

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1) 29.3
2) 27.8

10. Originally Posted by kwun
weave 2 strings.
one pull only at B10 at 30lbs till tension head stops.

i will post a video of the process soon.
its probably too late now.
Wouldn't be better if you release the video with the readings blanked out then we might get a better chance to get it right

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12. Sorry, I don't get out of bed for more than \$10,000

13. 1. 29.8
2. 27.8

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Originally Posted by Maklike Tier
Sorry, I don't get out of bed for more than \$10,000
less*543210

15. i have not done stringing for a decade (or more).

a wild guess would be 1. 28.5, 2. 27.5

16. Originally Posted by kwun
imagine the scenario when starting cross strings at B9->D9.
1) if i tie off on B8 or B7. and pull 30lbs at D9. what is the tension outside B9?
2) if i weave 2 strings B9->D9, D10->B10, then i pull once at B10, what is the tension outside B9?
answers must be in pounds of tension and must be a single number and not a range.
the formula for closest will be the sum of the absolute of difference.
the value will be taken from measurement from my machine. the value will be taken 1 minute after my WISE beeps to let the tension settle. setting will be fast speed, no pre-stretch, constant pull.

The PRIZE will be one 10metre length of Zymax String of your choice (ZM62/65/67/70)
ZM62 will be cut from a reel.
ZM65/67/70 will be a package.
(i might add more prizes later if i can find more sponsors)

The answer will be revealed in a video of the measurement.
fast speed, no pre-stretch, and 1 minute after beep of Wise2086, constant-pull :
1. 30 lbs
2. 15 lbs

17. added the Info video!!!

the contest is now significantly more exciting because now we have 2 sponsors who are sponsoring some exciting prizes!!!!

- Badminton-Nation.com, the exclusive Li-Ning USA distributor is giving the winner a Performance Li-Ning shirt.

- MyBadmintonStore.com is giving the winner a pack of the brand new NBG99 string!

and this is in addition to the Ashaway Zymax string that AshawayUSA.com gave me.

Maybe I should enter the contest too. those prizes looks very attractive.

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