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Can you point out where you have written the equations that you claim to understand?What is wrong with my assumption? Can you explain how you would correct it? I bet not. The math is pretty simple if I assume there is no spring effect and the impact is in-elastic. I posted a link but that simple formulas seems to confused you. So lets assume the impact isn't in-elastic. Can you derive the speed and spin after impact formulas? Do you even know what they are? Now you are really lost.
How can you criticize what you don't understand?
Does it really change anything? The point is that one should be able to generate enough spin even with a dead rubber. One should be able to generate more than enough spin with rubber that that has some tangential elasticity. If you can generate spin with these new rubbers, and just about any of them, it is your problem not the equipment.
I am still waiting for Zeio to explain how power stroke, hitting through the ball, can generate the claimed spin. There is a way, but not very likely. let's see if Zeio can explain it.