Sound chrony vs light sensor?

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Shinyknight

Shinyknight

Member
Feb 26, 2019
319
14
Minnesota
How accurate are the sound detecting chrony vs the traditional one that use light sensor? I have the F1/alpha chrony that use light sensor. And it measure by the pellet passing over the first sensor and the 2nd, and calculate the time between the two and give you your speed. How does the sound chrony work? Louder it is, faster it's going? Or does it measure the sound of the blast, and the sound of the pellet impact and give you your speed. What if you shoot into the air and there is no impact sound. Would you still get a reading? What if you dry fire, it makes a sound, would you get a reading? Kinda interesting, dry fire and it says 850 fps. Lol. Idk but I don't really trust how accurate these sound chrony are. Fx is making a pocket side sound chrony. Seem like a good deal if price is right and it accurate.
 
Not really sure. I watch a few review on it but they didn't say much how it work..I thought it measure the speed by sound waves. Not sure how it works but I wonder how accurate it is compare to traditional chrony. Cause the light sensor have problem reading if you don't have enough light, and lighting from ceiling really mess up the chrony and give errors.
 
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I don't know of anything that is sound based, but I have a Magnetospeed V3, which uses electromagnetic sensors in the bayonet attachment to the rifle's muzzle. It is especially helpful with air rifle tuning, since it needs no light, and can be used indoors. When working with several rifles, it isn't as handy as either a traditional light-based chrono, or a radar unit, since part of it is attached to the rifle. It saves the data on a card that can then be downloaded to your lap top. My traditional chrono is a Competition Electronics Pro Chrono, which has a blue tooth adapter that lets you record to your smart phone as you shoot. 
 
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I have a Ohler 35p that bought back on 2000. This is a 3 channel light sensing Chrony, its extremely accurate but its down side is, its more elaborate set-up process and don’t work well on shades, added a set of IR LEDs and solved my problem. Accuracy wise, it’s my go to tool for me. I Had high speed and radar based speed measuring equipment for a lab that created for work and back them compared the speed reading on the Oehler and was dead on, the diferenace was so insanely small that made us do a full cal check on the lab equipment since the speed reading difference was just .001 of a second . Radar based technology is very accurate providing that they have done all the programming and calculation equations right. Dollar and accuracy wise, the FX Chrony would be an interesting unit to try out. I plan to buy one and have my lab friends go over it to comparare speed readings for me since no longer own the lab but they do testing for me when I need it.
 
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