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If you haven't read my chronographing method read it {http://www.instructables.com/id/AirsoftAirgun_or_other_projectile_throwing_devic/ ] before continuing.

In this instructable I will be showing you how to adapt the chronographing method to give approximate rate of fire of an automatic airsoft gun.

You will need:
1. An airsoft gun
2. A computer with audio capture card ( one with a microphone input to be precise)*
3. A microphone
4. An audio capture program ( Audacity is open source, free and worked well for this application. It can be downloaded here http://audacity.sourceforge.net/)
5. A target that will cause a sound when struck and an appropriate backstop
6. As always with projectiles, A SAFE AREA TO TEST THE DEVICE AND AN APPROPRIATE BACKSTOP. ACCIDENTS HAPPEN AND SO PRECAUTIONS SHOULD ALWAYS BE TAKEN TO PREVENT INJURY.

  • A device that captures audio with a high enough bit rate, preferably in .wav format could be substituted for the computer, if you can't put the computer in place, or don't have a capture card. I haven't tried this but I don't see why it couldn't work. I know there are .mp3 players out there with microphones and recording software, and usb ports are on all, if not most computers these days.

You will notice that much the same equipment is used in this 'able as the last.

Ready to go? On to the set up

Step 1: Setting up

1.The target should be placed downrange a short distance (5 metres would be acceptable, depending on how loud your gun is. With a louder gun your results may be hard to decipher and so a longer distance should be used).

2.With the target in place and secured with an appropriate backstop the recording source is placed next to the target. It could be placed beside or behind the target, as long as it is close enough to catch the sound of the target being struck and will not be damaged by the incoming fire.

3.Load up your gun with enough BB's to last for a couple of seconds of full automatic fire. With some guns a full magazine is just about right (low cap. mag.).
Another clever and well done instrucatable. Will use when my new ASGI G4 A3 DMR arrives. Good job

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More by MacSuibhne: How to use my chronograph method to get ROF Airsoft or Airgun (or other projectile throwing device) Chronograph using a microphone
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