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  1. Then you calculate. ...

    Then you calculate.


    I=(2/5)*mass*((R^5-r^5)/(R^3-r^3))

    R is the outer radius of the ball. r is the inner radius of the hollow sphere. R-r is the thickness of the shell.
    The inertia I get...
  2. Langel is correct! The ball with the thinner...

    Langel is correct! The ball with the thinner shell has more rotational, we are talking about spin here, inertia than a thicker shell ball. This is because more of the mass is farther away from the...
  3. They will if the radius of the balls is smaller. ...

    They will if the radius of the balls is smaller. They will also rotate faster if the inertia of the thin shell balls is less.
    This assumes they are subject to the same stroke.
    The question is how...
  4. That is a cheap shot. Why don't you state what...

    That is a cheap shot. Why don't you state what isn't true? Can you?

    I really don't see the what the argument is about. Any ball with top spin is a top spin ball. A loop kill is a subset of top...
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  5. What do you mean by even? that is the...

    What do you mean by even?


    that is the easiest way as long as your stroke is upwards and not forwards. Obviously if the ball is high you can just smash it.


    This is wrong, wrong, wrong. ...
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  6. Analyzing Henzel's loops You have obviously seen...

    Analyzing Henzel's loops
    You have obviously seen the video but do you really know what is going on?
    I had problems looping back spin years ago. The problem was that the coach and anyone that I was...
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  7. Yes, this was taken out of context. I was...

    Yes, this was taken out of context. I was responding to someone talking about hitting through the rubber and the blade. Not, hitting through the ball but now we can see that 'hit through' has no...
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  8. You quote without context but you are right. ...

    You quote without context but you are right. Hit through what or where? It is sloppy. The stroke must apply force upwards and eccentric. That is a good description of what must be done. I know...
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  9. Going for a loop kill against a very spinny back...

    Going for a loop kill against a very spinny back spin is very difficult because you can't hit through the ball like you normally would. You need to bring the paddle back down behind your knee and...
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  10. [quote="zeio;356375"]Forget it. For someone who...

    I have seen some good studies and many bad ones. Do you have doubts about the validity of the info you post? If so then why try to fool the forum?


    What name? Varenberg or D-K?
    You haven't...
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  11. zeio, explain what is the "tricky" force that...

    zeio, explain what is the "tricky" force that causes the tricky jump.
    What is tensioned in "tensioned" tubber. What holds the rubber in tension?
    Show us an equation where tension is used in TT....
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  12. zeio can't get his fact straight and copies...

    zeio can't get his fact straight and copies documents he doesn't understand. The latest case shows his ignorance of static and dynamic friction.
    You guys can remain ignorant if you want. I am sure...
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  13. No, you are wasting your money. You are looking...

    No, you are wasting your money. You are looking for a cheap fix.
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  14. @yousuhika, ...

    @yousuhika, ignore the comments. They are only opinions.

    I have no idea what a 5.5 rubber means. There are no units. The number is bogus and irrelevant unless there are units.
    There is too...
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  15. That testing doesn't look like a TT rubber was...

    That testing doesn't look like a TT rubber was involved. It is best to have hard but frictionless material in the chain ways of conveyor lines. It reduced energy costs and wear.

    What is 0.5...
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  16. And WTF have you done? lLke the one on...

    And WTF have you done?


    lLke the one on reduced mass. on mytt I had to finally explain it.
    Posting is not understanding nor does it guarantee the quality of the document.
    People post bogus...
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  17. Maybe we should ask that the "born on" date be no...

    Maybe we should ask that the "born on" date be no more that 2 months old. I bet many TT suppliers have shelves of old TT rubbers that are old because they are no longer the latest fad.
    I think I...
  18. Rubber loses its elasticity over time. I have...

    Rubber loses its elasticity over time.
    I have very old paddle, 50 years old. I haven't played with it since 1972. Now topsheet is hard like anti and he sponge is brittle. Your rubber isn't that...
  19. It is all in your mind. I have a TBS, a TB ALC...

    It is all in your mind. I have a TBS, a TB ALC and a c-pen YEO. They all can loop well. it is more a matter of the rubber and technique.
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  20. I use non-tacky rubber because tacky rubber loses...

    I use non-tacky rubber because tacky rubber loses it tackiness over time and quickly gets dirty. I do sometime brush so thinly that the ball seems to drop off my paddle. This might not happen if I...
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  21. This contradicts what people like Yogi and I have...

    This contradicts what people like Yogi and I have been saying.
    Tacky rubbers grip better than non tacky rubbers at low impact speeds as when brushing. When brushing the impact is more tangential...
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  22. I prefer diagonal in a straight line defined by...

    I prefer diagonal in a straight line defined by the FH corner to the FH corner. The camera should be about net height. The problem is that often you can;t see the ball land in the near opponents...
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  23. So, it seems everyone measures "tackiness" by...

    So, it seems everyone measures "tackiness" by seeing how long a ball will stick to the bottoms side of a horizontal paddle but "tackiness" only seems to last a few seconds IF the rubber is clean....
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  24. There is already a specification for the COR of a...

    There is already a specification for the COR of a ball bouncing off a steel plate from 30cm high. The unfortunate thing is that the COR changes as a function of impact speed according to the...
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  25. https://deltamotion.com/peter/TableTennis/19940801...

    https://deltamotion.com/peter/TableTennis/199408014%20-%20%20Tiefenbacher%20-%20Impact.pdf
    Great! You read it. You are the second one besides me to have read it. However, I don't see where...
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