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Old 04-23-2012, 03:19 AM   #745
paulfreda
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Here is a great slow motion video that shows how poly and co-poly generate so much spin.

http://www.theatlantic.com/magazine/...f-tennis/8339/

The strings slide on impact but then recoil as the ball leaves thus causing an increase in spin in addition to that generated by the low to high motion.
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