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Old 01-30-2013, 05:05 PM   #17
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Originally Posted by Chas Tennis View Post
That Federer serve is just one shot. Maybe it was a fault.
I have no idea.

Originally Posted by Chas Tennis View Post
The question needs stats on successful serves.

Racket Head Motion During Impact - Also, given the racket motion, the time that the ball is in contact with the strings, say, 0.005 sec, is not necessarily negligible regarding the racket velocity. IRS, for example, takes only about 0.03 sec for the racket to be edge-on at about 90 to the forearm to β at impact. Tilt during contact?

How much is the racket tilting (closing) during those 0.005 seconds of ball contact? When during that time was the video frame captured?
There is racquet motion around impact where video speed is 500fps. IMO contact point is in Frame9.

See also some examples in thread
Anatoly Antipin - one of the most delicate tennis players in the world.
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