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Old 11-12-2012, 05:42 AM   #5
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Join Date: Sep 2011
Posts: 940

As I understand it, the speed guns measure the speed shortly after the ball leaves the racquet. Using time and distance will result in a slower speed than the gun would give, as the ball loses a fair amount of speed due to friction moving through the air. The data would still be useful as a relative measure, but would not be comparable to radar data. If you were to use time and distance, would it be to where it bounces, or to the receiver's racquet? If the latter, then court material will also be a factor. Then you also need to take into account spin, as a heavily sliced serve will travel a greater distance than a flat serve (assuming the same release and bounce points).
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