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Originally Posted by Greg Needel
I am personally a fan of the radar gun.
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Umm, what about a beam-break sensor? Super simple to build, just as easy to calibrate, portable, battery-powerable, and will work with any shooter.
In case the idea isn't clear: Think of a tube a few inches (maybe a foot) long. Have someone shoot their ball through the tube. In the tube is an emitter (of light) and a sensor (on the sother side of the tube). Simply measure the time that a 7" ball breaks the beam (a few milliseconds) and you have a speed. Of course, the exact size of the ball needs to be measured, and an accurate timer needs to be used.
On the other hand, ask any experienced police officer, they will tell you they can judge the speed of a car to within 2 or 3 miles per hour, just from experience. I'd bet the referees develop a similar feel for speed, and will send teams back to the inspectors often.
Don