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Handsonic · April 14th, 2016, 05:13

Calculating FPS with anything but a chronograph will get you very skewed answers. If you try to calculate it using sound, your answer will be WAY off because BB's fly at about 1/3rd the speed of sound. By the time the sound of gunfire is registered by the microphone, the BB will have already traveled a significant distance. Also, if your gun is electric, it will be hard to know at exactly what point the BB was fired by looking at sound, since the sound of the motor spinning will probably be what gets registered. If you try to calculate FPS by shooting at targets at a distance, the BB will have slowed enough to skew your calculation for muzzle velocity way down.

Definitely get a chrono for measuring velocity.

April 14th, 2016, 05:13	#12
Handsonic "I like syrup on my blue waffles." #diseasedvagina Trader rating Join Date: Oct 2015 Location: Vaughan	Calculating FPS with anything but a chronograph will get you very skewed answers. If you try to calculate it using sound, your answer will be WAY off because BB's fly at about 1/3rd the speed of sound. By the time the sound of gunfire is registered by the microphone, the BB will have already traveled a significant distance. Also, if your gun is electric, it will be hard to know at exactly what point the BB was fired by looking at sound, since the sound of the motor spinning will probably be what gets registered. If you try to calculate FPS by shooting at targets at a distance, the BB will have slowed enough to skew your calculation for muzzle velocity way down. Definitely get a chrono for measuring velocity. Last edited by Handsonic; April 14th, 2016 at 05:18..