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Old 08-19-2012, 06:18 PM   #18
Join Date: Jul 2008
Posts: 5,440

Digging effect

Sometimes the spin component cannot produce any significant ball rotation but can change considerably the ball direction and speed.

For instance, if the point of contact is the sweet spot and the flat component VF has very high speed. The ball just digs into strings bed; the strings hug the ball very hard and do not allow creating any ball’s rotation during “digging” phase of the impact.
Then strings catapult the ball very fast and the spin component does not have enough time to rotate the ball.

However, while the ball is in digging and catapult phases the spin component still moves the racquet in its direction and as a result it varies the ball’s direction and speed.
If the spin component of the swing is there, there will probably always be spin as a result. Please see this paper by R. Cross and take note of

2. Spin Generation
5. Racquet rotation
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