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PostPosted: 14 Feb 2017, 12:46 
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In a similar vein to the Speed of a Table Tennis Ball discussion earlier, what stats do we have on the maximum SPIN of a table tennis ball?

I can't actually find any meaning info on this. :oops:

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PostPosted: 14 Feb 2017, 12:48 
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As generated by human beings? It'd be interesting to see what sort of equipment would be needed to measure that - probably marked balls and high speed cameras. Spin won't decay as quickly as speed does, too.

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PostPosted: 14 Feb 2017, 23:39 
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There is a 1992 study available at http://www.old.ittf.com/ittf_science/SS ... 20Spin.pdf

This was using the old 38mm ball. Maximum looping rotation achieved by a member of the China National Men's Team was 151 revolutions per second, or about 9000rpm.

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PostPosted: 15 Feb 2017, 11:41 
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hangdog wrote:
There is a 1992 study available at http://www.old.ittf.com/ittf_science/SS ... 20Spin.pdf

This was using the old 38mm ball. Maximum looping rotation achieved by a member of the China National Men's Team was 151 revolutions per second, or about 9000rpm.

Thanks hangdog!

I suspect that number probably does not change much if it for the initial rotation speed. The bigger (and plastic) balls would obviously lose spin more quickly.

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PostPosted: 15 Feb 2017, 22:39 
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More importantly, what's the maximum "reversal" rotation? :devil: :lol: :lol:

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PostPosted: 16 Feb 2017, 05:06 
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RebornTTEvnglist wrote:
More importantly, what's the maximum "reversal" rotation? :devil: :lol: :lol:

Too much! :P :P

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PostPosted: 19 Feb 2017, 08:57 
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A bit of fun trying out a Sony RX100 v and playing with the footage in Adobe Premier CS5.5



Once you can see/record what's happening spin rates become easier to measure and calculate.

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PostPosted: 19 Feb 2017, 19:18 
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Very nice Debater! :up: :up: :up:

The Rakza 7 one really showed that the ball does sink into the rubber, or the ball deforms on impact, not sure which, but the former seems more plausible.

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PostPosted: 19 Feb 2017, 20:01 
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haggisv wrote:
Very nice Debater! :up: :up: :up:

The Rakza 7 one really showed that the ball does sink into the rubber, or the ball deforms on impact, not sure which, but the former seems more plausible.


When you watch the ball landing on the Dr Evil at the beginning, the ball doesn't "deform" or sink in to the pimples like it does on the Rakza 7 topsheet. It simply bounces off. With the ball falling "gently", hard glass surface underneath and landing on top of the pimples I don't think there is enough "give" for it to be noticeable at the speed and angle I filmed. To a degree I think this points in the direction of the impact a top sheet can have and the sponge under the top sheet - subject to the ball making contact at different angles etc

I took the sponge off the back of a sheet of globe 899-2 and used it OX for a few matches in our league a couple of years ago. I was curious to know if the grippier top sheet of the globe would be better suited to my game than the Dr Evil, but still in ox format - I liked the direct feel.

Unfortunately due to the short recording time of the Sony at 1000 fps and issues with fiddly menu settings and operation I won't be pursuing it's use for further testing of TT equipment.

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PostPosted: 19 Feb 2017, 22:57 
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haggisv wrote:
hangdog wrote:
There is a 1992 study available at http://www.old.ittf.com/ittf_science/SS ... 20Spin.pdf

This was using the old 38mm ball. Maximum looping rotation achieved by a member of the China National Men's Team was 151 revolutions per second, or about 9000rpm.

Thanks hangdog!

I suspect that number probably does not change much if it for the initial rotation speed. The bigger (and plastic) balls would obviously lose spin more quickly.


If you think about it, if the maximum achievable racket speed is the same, this means the maximum achievable tangential speed is the same. Assuming no (or the same degree of) ball slippage, the maximum achievable RPM would be less by 5%, because the circumference of the ball is greater by 5%. Would the 40mm ball lose RPM faster? That remains to be seen, it's not obvious that it would. Tangential speed is the same, so drag per unit surface area is the same, but you do have more surface area (1.05 squared times more). On the other hand you also have a greater angular momentum, since the ball weighs more AND the radius is greater. My calculus is out of practice, these are quantities that have to be integrated over the surface of a sphere, I'll bet there are people on this forum who are of the right age and could do it easily.

Iskandar


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PostPosted: 15 Apr 2017, 06:11 
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There are a series of program (5 episodes) found in YouTube, talking about the speed and strength of spin of the top players ( in the China community) in their serving (and compare to national team). The judge is 70s National team player Xu Shaofa, and each episode has different guest, this one the guest is the teacher of Ma Long. They will use computer / equipment to measure the speed and spin (same equipment to test the national team).

http://youtu.be/MVTAc0QrhWk


At approxite 13'20" minutes, they said the former national team player in serving, speed is 8.5m / s, and spin is 62.5 rev/s.

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Last edited by Pingpong Buddha on 16 Apr 2017, 00:35, edited 1 time in total.

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PostPosted: 15 Apr 2017, 20:14 
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Pingpong Buddha wrote:
There are a series of program (5 episodes) found in YouTube, talking about the speed and strength of spin of the top players ( in the China community) in their serving (and compare to national team). The judge is 70s National team player Xu Shaofa, and each episode has different guest, this one the guest is the teacher of Ma Long. They will use computer / equipment to measure the speed and spin (same equipment to test the national team).

http://youtu.be/MVTAc0QrhWk


At approxite 13'20" minutes, they said the former national team player in servicing, speed is 8.5m / s, and spin is 62.5 rev/s.

Very interesting video Pingpong Buddha :up:

Is that the spin & speed of a serve though?

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PostPosted: 16 Apr 2017, 00:21 
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Yes, it is only for a serve.

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