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Trick question about sponge hardness and flex

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seguso View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote seguso Quote  Post ReplyReply Direct Link To This Post Posted: 05/01/2021 at 10:57am
Ball deformation increases the contact surface, so it certainly increases the spin other things equal. But other things are not equal if you increase the rubber hardness beyond a certain point. Because then you are also giving up the fact that the rubber wraps the ball. So, if the rubber-wrapping factor is more important than ball deformation, you will lose spin. So, yes, it needs to be tested which factor is more important.

But to me it seems likely that the rubber wrapping the ball outweighs the effect of ball deformation. Imagine a blade with an H3 rubber but with a 0.5mm sponge. And then the same blade with the same H3 rubber but with 2.2mm sponge. It seems safe to say that the ball will deform more with the 0.5mm than with the 2.2mm (because the blade is harder than the sponge). It also seems safe to say that the spin will be less on the 0.5mm sponge. Even though the ball deforms more in that case. So the ball wrapping effect is probably much more important. Maybe. :)


Edited by seguso - 05/01/2021 at 3:33pm
pg5 - mxp fh - jp03 bh - 2015 video
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vanjr View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vanjr Quote  Post ReplyReply Direct Link To This Post Posted: 05/04/2021 at 8:07am
I think one premise to the question is wrong. I do not believe any one "does not have the power" to adequately use the harder sponge. I think many "do not have the technique" to appropriately use certain equipment combinations. 

I also agree with the blade stiffness/flex and hard/soft are different attributes of a blade. Lastly we talk about sponge hardness, but it really is sponge and topsheet hardness that matter. We never compress one without the other. 

Fun discussion. 
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zeio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zeio Quote  Post ReplyReply Direct Link To This Post Posted: 05/06/2021 at 5:20am
The buckling could reduce the contact area when the deformation transforms from a disk shape to a ring shape as the velocity increases.

When ONE independent variable is changed, MULTIPLE dependent variables could get affected, and the relationships do not necessarily have to be linear. The assumptions we FEEL to be TRUE and INTUITVE may in fact be non-physical. At this point, we just don't have enough data to tell how deformation distributes among the ball, rubber, and blade during an impact for different rubbers of different hardness and thickness etc. We can't even tell if "topsheet spin" and "mechanical spin" are how tacky and grippy rubbers actually work, respectively.
Viscaria FL - 91g
+ Neo H3 2.15 Blk - 44.5g(55.3g uncut bare)
+ Hexer HD 2.1 Red - 49.3g(68.5g 〃 〃)
= 184.8g
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tom View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tom Quote  Post ReplyReply Direct Link To This Post Posted: 05/06/2021 at 9:25am
Originally posted by zeio zeio wrote:

The buckling could reduce the contact area when the deformation transforms from a disk shape to a ring shape as the velocity increases.

When ONE independent variable is changed, MULTIPLE dependent variables could get affected, and the relationships do not necessarily have to be linear. The assumptions we FEEL to be TRUE and INTUITVE may in fact be non-physical. At this point, we just don't have enough data to tell how deformation distributes among the ball, rubber, and blade during an impact for different rubbers of different hardness and thickness etc. We can't even tell if "topsheet spin" and "mechanical spin" are how tacky and grippy rubbers actually work, respectively.
so with the above stmts, a lot of  the dynamics of the rubber is still unknown to us, and although it is fun to have all kinds of discussions, we should still trust what equipment works best  for us (in reality)
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