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Here is my hypothesis-
The strongest correlation for whether or not a player tends to stroke with a straighter arm or one that is bent more is between the amount of bend in the preferred drive loop stroke and what grip the player uses for the FH.
FH biased grip- TB, DO, JM, MM etc...
Players who use a FH biased grip tend to optimize their drive loop around having a an arm bend between 90' and 110 degrees or so. Also utilizing a more whip crack kind of motion. There are a few exceptions but they tend employ some wrist manipulation to compensate if they straighten their arm.
Neutral/BH biased grip- WLQ, FZD,ZJk, ML, YA, FB, LSS etc...
Players who use a neutral or BH biased grip tend to optimize around their drive loops around a more open/extended arm say between 120' and 180'.
Seeing a trend? I thought so. No CNT player to my knowledge uses a FH biased grip on the FH. And a majority of European and Japanese players use a FH biased grip. I think this is the where the "Euro FH" vs "CN" debate has come from. It is true but not because there is some special magic but because their is a clustering effect around the grips that most of the players use and optimize their game around.
Try this for yourself. Stand facing the table. Hold a FH biased grip like Timo and straighten your arm out to the side with a straight wrist and the long axis of the paddle parallel with the floor or table. Notice how the paddle faces away from you slightly. Do not flex or extend your wrist. Now keep your arm straight and swing your arm forward until the paddle faces a point where if you were hitting a ball it would go cross court. Note that arm moves to a position almost straight in front of you before the paddle is in position to hit a cross court shot. Now start from the same initial position but bend your elbow instead. A lot more comfortable to do this but note your elbow bend.
Now do the same thing with a neutral or slight BH biased grip. Notice that it takes very little movement in a neutral grip before the paddle is facing cross court, less than half the rotation, and that you don't really have to bend your elbow. In fact the blade starts off pointing down the line and you can just rotate your torso just a tad and your paddle is facing cross court.
So what about ZJK's bent arm or Yan An? Well there strokes are shorter but they look nothing like Timo's or Maze's whip like motion.
My point is that players stroke mechanics are optimized around their grip and it's perceived advantages and disadvantages.
With regard to spin I think that the top CN spin the ball harder simply because they have to deliver more energy to the point of contact due to the hardness of the rubber. Basically the rubber requires more force to fully deform and so delivers more energy back to the ball which is mostly converted to spin. The trade off is that you have to keep your strokes within a certain swing speed range in order to fully utilize the rubbers ability to convert the energy into spin. This is why most amateurs probably can't fully utilize hard rubbers, or at least harder/boosted rubbers, because they can't maintain the high consistent swing speeds necessary to engage the rubber.
The strongest correlation for whether or not a player tends to stroke with a straighter arm or one that is bent more is between the amount of bend in the preferred drive loop stroke and what grip the player uses for the FH.
FH biased grip- TB, DO, JM, MM etc...
Players who use a FH biased grip tend to optimize their drive loop around having a an arm bend between 90' and 110 degrees or so. Also utilizing a more whip crack kind of motion. There are a few exceptions but they tend employ some wrist manipulation to compensate if they straighten their arm.
Neutral/BH biased grip- WLQ, FZD,ZJk, ML, YA, FB, LSS etc...
Players who use a neutral or BH biased grip tend to optimize around their drive loops around a more open/extended arm say between 120' and 180'.
Seeing a trend? I thought so. No CNT player to my knowledge uses a FH biased grip on the FH. And a majority of European and Japanese players use a FH biased grip. I think this is the where the "Euro FH" vs "CN" debate has come from. It is true but not because there is some special magic but because their is a clustering effect around the grips that most of the players use and optimize their game around.
Try this for yourself. Stand facing the table. Hold a FH biased grip like Timo and straighten your arm out to the side with a straight wrist and the long axis of the paddle parallel with the floor or table. Notice how the paddle faces away from you slightly. Do not flex or extend your wrist. Now keep your arm straight and swing your arm forward until the paddle faces a point where if you were hitting a ball it would go cross court. Note that arm moves to a position almost straight in front of you before the paddle is in position to hit a cross court shot. Now start from the same initial position but bend your elbow instead. A lot more comfortable to do this but note your elbow bend.
Now do the same thing with a neutral or slight BH biased grip. Notice that it takes very little movement in a neutral grip before the paddle is facing cross court, less than half the rotation, and that you don't really have to bend your elbow. In fact the blade starts off pointing down the line and you can just rotate your torso just a tad and your paddle is facing cross court.
So what about ZJK's bent arm or Yan An? Well there strokes are shorter but they look nothing like Timo's or Maze's whip like motion.
My point is that players stroke mechanics are optimized around their grip and it's perceived advantages and disadvantages.
With regard to spin I think that the top CN spin the ball harder simply because they have to deliver more energy to the point of contact due to the hardness of the rubber. Basically the rubber requires more force to fully deform and so delivers more energy back to the ball which is mostly converted to spin. The trade off is that you have to keep your strokes within a certain swing speed range in order to fully utilize the rubbers ability to convert the energy into spin. This is why most amateurs probably can't fully utilize hard rubbers, or at least harder/boosted rubbers, because they can't maintain the high consistent swing speeds necessary to engage the rubber.
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