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Old 10-16-2012, 06:43 AM   #523
julian
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Join Date: Dec 2006
Location: Bedford,Massachusetts,US
Posts: 2,501
Default A shape of the ball

Quote:
Originally Posted by toly View Post
If racquet velocity has normal component only (normal to string bed) and point of contact is sweet spot, you hit pure flat FH (forget about strings actions). Because of the absolute symmetry of the ball there always should be solid contact.
If racquet speed has tangential component only, there never will be solid contact.
A ball is NOT symmetric at the contact-see some pictures at the contact time
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