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Old 08-26-2013, 08:40 PM   #3
Join Date: May 2012
Location: Bay Area California
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Originally Posted by Chas Tennis View Post
That reference says
"How long is the time from buttcap position to the spring forward? At most, half a second."................

Here are some Nadal forehands. We can estimate the time it takes to go from the butt cap position to impact. 240 fps

The best way to do stop action single frame on Vimeo is to press the play pause button as fast as possible.

I count about 11 frames from the time the butt cap is pointing at the ball until impact.
t = 11 fr /240 fr/sec
t = 0.045 second.

He says < 0.5 second.

I'd say that he is off by a factor of 10X. ?

[1/2 second recorded at 240 fps takes 4 seconds when played back at 30 fps, as in the Nadal video. ]
Sorry about that I knew it happens really fast but I did not know it was that fast. Shame on me for blindly putting numbers up. From what I see on reg speed videos it looks like half a second to me. Maybe the way I see a half a second is too fast. =\

Thanks for showing me Chas
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