Search:

Type: Posts; User: brokenball; Keyword(s):

Page 1 of 20 1 2 3 4

Search: Search took 0.01 seconds.

  1. What does that have to do with looping or...

    What does that have to do with looping or chopping balls? My document is meant to show how the range of spins, speeds and initial angles for landing a ball is quite small. Also, we figure it out in...
    Replies
    24
    Views
    1,355
  2. [quote="Zwill;369644"]To me the 20m/s sounds...

    [quote="Zwill;369644"]To me the 20m/s sounds about right, but 75rps...? Is that with pips???

    Butterfly just did some videos, 20m/s and 120-150rps doesn't seem like a big deal....
    Replies
    24
    Views
    1,355
  3. After a week of trying to straighten out what the...

    After a week of trying to straighten out what the Magnus coefficient should be for a TT ball it seems that no one really knows exactly. So I picked one that matched the trajectories I see in videos....
    Replies
    24
    Views
    1,355
  4. Your coach is wrong. Where is his proof? Do you...

    Your coach is wrong. Where is his proof? Do you just repeat anything that someone says?
    Spin is only reduced a about 6% based on the ratio of plastic ball to celluloid ball inertia. By radius the...
    Replies
    72
    Views
    6,654
  5. You can see she is aware of how the long pips...

    You can see she is aware of how the long pips return the ball. Notice she is opening the paddle a little when the ball has backspin and the next ball has top spin so she closes the paddle. This...
  6. When I put together a paddle for someone else...

    When I put together a paddle for someone else that I know will not change the rubbers, I put two coats on the blade and on the rubber. I wait for the rubber cement to dry thoroughly before applying...
  7. I haven't resolved the problem with the...

    I haven't resolved the problem with the simulations yet but it is clear to me the problem is with the coefficient of drag, Cd, and the Magnus coefficient, Cm. These are unitless numbers and are...
    Replies
    24
    Views
    1,355
  8. I found a problem. I have an initial ball speed...

    I found a problem. I have an initial ball speed of 40m/s which is too high. The higher ball speeds are about 30m/s.
    I posted this problem on...
    Replies
    24
    Views
    1,355
  9. You better not be right! However, I don't have a...

    You better not be right! However, I don't have a better explanation for now.
    Physics documentation uses ω as the symbol for rotation in radians per second.
    A thousand curses on any nit wit that...
    Replies
    24
    Views
    1,355
  10. What I have found is, TRUST NO ONE. Not the...

    What I have found is, TRUST NO ONE. Not the players, not the physicist. Not all physicist are good. The same goes for engineers. Not all are good.
    I am always skeptical. Even of my own work. ...
  11. You guys should know by now I am a geek, nerd and...

    You guys should know by now I am a geek, nerd and skeptic. Just because I post this doesn't mean it is right. Math looks right but it doesn't seem right to me.
    It is 8 pages long so a I posted a...
    Replies
    24
    Views
    1,355
  12. There is no equation for speed as a function of...

    There is no equation for speed as a function of hardness. Only elasticity matters when it comes to COR. Stop believing all the crap on TT forums.
    What hardness you choose is a matter of...
  13. Yes! Engineers/physicist can't agree on the...

    Yes! Engineers/physicist can't agree on the correct formula for the Magnus effect. I have found two sources that are almost the same except for a constant that is just a little different. Both...
    Replies
    24
    Views
    1,355
  14. Do you really want to learn something?

    I have simulations of TT ball trajectories. I started the simulation over 10 years ago. I haven't done much with they lately but since I am now retired, I have more time to do simulations. Years...
    Replies
    24
    Views
    1,355
  15. This made me laugh.

    This made me laugh.
    Replies
    72
    Views
    4,400
  16. NO! It depends on the material involved....

    NO! It depends on the material involved.
    https://www.engineersedge.com/coeffients_of_friction.htm
    Do you see area in these equations?
    Do you see pressure in these equations?
    The idea of pressure...
    Replies
    72
    Views
    4,400
  17. What do you really get from boosting? Much...

    What do you really get from boosting?
    Much depends on how you play. If you play close to the table then speed is not as important as spin to point. Tacky rubbers are very good for brushing and...
    Replies
    72
    Views
    4,400
  18. I like 802-40. I gave a sheet to one of my...

    I like 802-40. I gave a sheet to one of my practice partners and he likes it a lot. 802-40 can generate a lot of spin but it doesn't do as well at brushing an incoming top spin balls as a normal...
    Replies
    72
    Views
    4,400
  19. That is a generalization. Also, physic...

    That is a generalization.
    Also, physic professors are academics that don't get much real world experience.
    There were some on the mytt forum that didn't seem to know anything.
    TT coaches that...
    Replies
    72
    Views
    4,400
  20. I am civil. I haven't called you any names or...

    I am civil. I haven't called you any names or USDC would jump all over me.
    I am talking physics.


    This is an example of what I am talking about.
    This is nonsense.
    It makes NO difference...
    Replies
    72
    Views
    4,400
  21. You made a comment that "softer rubbers generate...

    You made a comment that "softer rubbers generate way less spin"
    Where is your proof!? You are just repeating something some other clueless person has said.
    Most people on this site are completely...
    Replies
    72
    Views
    4,400
  22. Yes they would. In the end there is only the...

    Yes they would. In the end there is only the normal and tangential coefficient of restitution.
    All this other stuff is just confusion to keep the ignorant, ignorant.


    Do you think that cool...
    Replies
    72
    Views
    4,400
  23. Where is your proof? You are just repeating BS...

    Where is your proof? You are just repeating BS you have heard from other players.
    BTW, my Rakza 7 Max soft is very spinny with the right strokes.


    Who's definition? Why can't a soft rubber be...
    Replies
    72
    Views
    4,400
  24. Again, define grippy. Is soft rubber...

    Again, define grippy.


    Is soft rubber spinnier or is it just more "grippy"
    So why are the TT manufacturers pushing the latest fad which is hard rubber?

    What about tacky rubbers? Is Rakza 7 a...
    Replies
    72
    Views
    4,400
  25. So there is nothing in between "catching" or...

    So there is nothing in between "catching" or "slipping"?
    Replies
    72
    Views
    4,400
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4
Create a new Topic:
Title is required.