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Discussion Starter · #1 ·
...but came close!

Fired tennis balls yesterday, with the "hand Howitzer" and triple TB gold bands, full butterfly. Clocked the shots at 129 mph (207 km/h)! That is just one mile per hour slower than Venus Williams record serve.

Tennis balls are quite heavy, 58 gramm (928 gr).

95 Joule, 71 ft-lb!


Jörg
 
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