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260. That's the number shown on the chronograph at the local indoor CQB arena tonight for my APS Mini Patriot M4. But the airsoft gun has shot at 330 feet-per-second (FPS) just two weeks before. And the gun has been newly built last month. That's a drastic FPS drop for an airsoft gun. What happened?
I'm obsessed to find out where the air is leaking. But before I can rebuild the gun, I need a chronograph; I need to be able to see the increase/decrease in FPS as I make changes. The most inexpensive chronograph is the Soft Air Swiss Arms BB Chronograph
I already have an Android phone. It could do almost anything, except cooking dinner. How can I make it a chronograph as well? That's where Chrono Connect Mobile Lite comes in the picture. It's a free Android app that is available on Google Play. You use it as a chronograph. So let's see how well it works.
The basic theory for the Chrono Connect Mobile Lite is to monitor the sound based on know distances and calculate the BB speed. That means you have to set up an audible target at a certain distance to the muzzle of your airsoft gun, while placing your Android phone close by (so you can read the velocity).
I had made my own BB target trap several weeks ago. It makes shooting inside my garage or my backyard a breeze. It has a paper front, which makes a decently loud sound when the BB penetrates it. It seems perfect for the job. Being useable inside my three car garage allows me to chronograph at any time.
Chrono Connect Mobile Light explains how to set up the range within its app (see screen shot below). You can get to that screen by launching the app, pressing the menu button, select "Target Options", then select "Distance Measuring Help."
Chrono Connect Mobile Light requires that the target from the gun is, at a minimum, 15 feet apart. I placed the target trap on top of a car (my eye level) and measured 19 feet to my desired standing location, where there is a nice spot to set the phone.
Once you have sat-up the range, it's time to set up the Chrono Connect Mobile Lite. It has numerous settings and all of them has to be right to give you accurate reading. The main setting menu is shown in the screen shot below.
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