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Average weight of the 2 or 2.1mm sponges |
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merlin el mago
Super Member Joined: 04/14/2018 Location: Blanes - Girona Status: Offline Points: 117 |
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Posted: 06/27/2020 at 9:21am |
I want to know the average weight of the 2 or 2.1mm sponges without the rubber cut for the blades.
TIA.
Edited by merlin el mago - 06/27/2020 at 9:22am |
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cole_ely
Premier Member Joined: 03/16/2005 Location: United States Status: Offline Points: 6895 |
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they're typically just under half of the rubber weight. Maybe 28g, depending on the type
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Wavestone St with Illumina 1.9r, defender1.7b
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cole_ely
Premier Member Joined: 03/16/2005 Location: United States Status: Offline Points: 6895 |
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Sorry cut. That's the full square maybe 20 or 22g cut?
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Wavestone St with Illumina 1.9r, defender1.7b
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merlin el mago
Super Member Joined: 04/14/2018 Location: Blanes - Girona Status: Offline Points: 117 |
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Thank you
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shinshiro
Super Member Joined: 09/21/2016 Location: Brazil Status: Offline Points: 243 |
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I agree. Once in the past I separated the sponge from topsheet of a small piece of a rubber (not sure exactly what rubber it was, maybe Mark V?...). I also don't remember the exact weight, but it was about the same as topsheet. I did that because I wanted to know how much weight I could save if I pick a thinner sponge. But I found that the difference is smaller than I initially thought.
Edited by shinshiro - 06/27/2020 at 4:46pm |
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igorponger
Premier Member Joined: 07/29/2006 Location: Everywhere Status: Offline Points: 3252 |
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LET'S DO SOME ARITHMETICS.
https://www.researchgate.net/publication/330152574_Table_Tennis_Ball_Impacting_Racket_Polymeric_Coatings_Experiments_and_Modeling_of_Key_Performance_Metrics Typically, Porous Sponge density is measured to 0.4 - 0.6 Hence, you can say a factual weight of the sponge sheet by doing some arithmetics. Example: sponge sheet 2 mm thick, being cut to the blade's size is known to square 200 cm2 net size. Sheet volumes 200 x 0.2 = 40 cm3 Dry Weight of the sponge sheet = 40 x 0.4-0.6 =16-24 grammes NOTE: Separate rubber topsheet of the same size should be approximately 2 times as bigger weight, for the higher material density of 0.9 -1.1 /Be happy/ Edited by igorponger - 06/28/2020 at 5:44pm |
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cole_ely
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in my empirical experience it's just not that big of a ratio at all. In Japanese rubber in fact, I would guess some tops might actually be lighter than the sponges.
When I had the palio c tops they were around 26 uncut....lighter than most sponges I put them on or maybe the same.
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Wavestone St with Illumina 1.9r, defender1.7b
Please let me know if I can be of assistance. |
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