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Old 08-26-2013, 08:18 PM   #2
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
Posts: 2,996
Default The time estimate is way too long. ?

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
https://vimeo.com/63687035

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 that 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. ]

Last edited by Chas Tennis : 08-26-2013 at 09:17 PM.
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