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The more established teams and organizations own guns. Colleges, most high schools, travel teams, sport training facilities etc. Pick up the phone and call these organizations and ask if there is a way you can get your velocity checked. Grab 2 friends; One to operate the gun .... and one that can catch. Take mask, cup and catchers mitt. Be sure you are loose before you try to max out.
A method I have used is to tape with a camcorder then use this formula-

distance/frame steps x 30(fps) x 3600(seconds in hour)/ 5280 (feet in a mile) + 3.5 = velocity out of hand +/- 1-2 mph. This formula is pretty much dead on in most cases and I have calibrated it with several different guns on several different occasions. Here is a recent example of son pitching-

Distance from release to back of plate = 55 feet, then add distance of cathers mitt to back of plate which was 3 feet which equals a total of distance to be "58 feet" Next I divided this byhow many actual frames it takes for this to happen. In this case it was 16 frames. So the calculation is thus- 58/16= 3.625. This is the amount of distance the pitch is "averaging" per frame over the course from release to being caught. Next is to actually calculate the average distance the ball would thus travel in a second's time. So we take the 3.625 and times it by 30 which is what my camera records in (frames per second) So- 3.625x30= 108.75. Now I know the ball is traveling 108.75 per second. Now to convert that into how much distance it would travel in an hour so we times 60x60 (seconds in a minute times minutes in an hour) which thus equals 3600. So then we times the distance the pitch averages in a second- 108.75 and times it by 3600 which = 391,500 feet in an hour. All that is then left is to convert that into miles insetad of feet which gives us the MPH. So 391,500/5280= 74.15mph. But this figure is just the average of the entire pitch and not the out of hand speed. So, calculations have shown that a pitch loses about 1 mph for every seven feet. so over the course of 58 feet it would lose about 7-8mph by the time it was caught. So, to be on the safe side the average would be about 3.5 being in the middle. So, then this 3.5 is added to the average speed of 74.15 for a total of 77.64 mph. This is thus the out of hand velocity that son threw in a recent game +/- 1-2 mph for error or minute changes in distance changes. I have used this formula over and over to great success and when I have a gun also in the camera I have never been off by more than 2 mph.
Do not worry about getting clocked right now. Chances are your Velocity will be down the day you have a gun on you because you are going to do what every young kid does when they see a gun and try and blow up the gun causing you to actually throw less effective, and with less velocity.

Just worry about pitching.. And thats it.

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