Trouble with Eastern Forehand

Discussion in 'Tennis Tips/Instruction' started by johnchung907, Jan 24, 2013.

  1. 10isfreak

    10isfreak Semi-Pro

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    "To be specific, you need a vertical velocity component of the racquet's swing path to generate topspin. Force alone, at least on the racquet, won't do it. You can put all the force you want on the racquet. If there hasn't been enough time for that force to sufficiently accelerate the racquet upward to create that significant vertical velocity component you're not going to get much topspin."

    Physically speaking, the top edge moving forward is also the back edge moving upward.
    You do not need, as a matter of FACT, the racket to move upward in any way to create top spin, even if it does.

    Top spin is also forward spin; it's also downward spin; it's also backward spin... it depends on your point of reference on the ball. In truth, they're not different: they're all the same thing happening at once.

    Now, if you hit the ball slightly behind, all the while being above center, both upward and forward action creates top spin. That's what it is, period. You can start trying to spare your convictions as much as you want... I never said that it doesn't create spin -- I said that additional upward movement affects top spin marginally, for various reasons.

    As for your impression regarding videos, all pros present a very vertical action once the contact is already made.
     
    #51
  2. sureshs

    sureshs Bionic Poster

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    Last edited: Feb 1, 2013
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  3. Dimcorner

    Dimcorner Professional

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    I think technically speaking you do not need upward force to create spin. If you hit with more forward force on the top of the ball vs the bottom of the ball then the net effect would be that the ball rotates with the leading edge being the side that was hit with more force.

    Also I guess you can consider the timing. The top hits first, starts to rotate and at the same time might roll down a little (or squash down) on the racquet. By the time the back of the ball impacts the string bed the top might be already on it's way out (rebound and rotation since the bottom might still be in compression stage). That would mean that to top is already rotating the ball and leaving the racquet so the bottom of the ball contribution would be less right?

    ???
     
    #53
  4. Dimcorner

    Dimcorner Professional

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    I don't think you would spin the ball much this way, but I guess it's possible to spin it some.
     
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  5. sureshs

    sureshs Bionic Poster

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    What this hints to me is that the brushing up action is less important for top spin than hitting through the ball in the arc with a somewhat closed face (which creates top spin due to the off-center orientation of the force of the racket on the ball). In other words, less "swiping" and more "hitting through."

    If all this is correct of course .........
     
    #55
  6. sureshs

    sureshs Bionic Poster

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    That is how top spin is modeled by TWU professor. The contact area is modeled as having two springs, one at the top and one at the bottom. If the top spring is compressed more than the bottom spring, top spin is produced. Vice versa produces slice.
     
    #56
  7. 10isfreak

    10isfreak Semi-Pro

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    Well, in theory, that's supposed to be what happens. Now, if we neglected something, it won't work. However, since pros so consistently show a slightly closed racket face, I would be confident that we nailed it.
     
    #57
  8. 10isfreak

    10isfreak Semi-Pro

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    #58
  9. rkelley

    rkelley Hall of Fame

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    Wow, I missed all the bold and red.

    I guess we disagree. That's cool.
     
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