PV3 Breakover

[Rob M]

that gun is quite an accomplishment. Be nice if you could use the arduino or rasberry Pi to tune it on the fly,, Have you had a chance to compare similarities to the umarex hammer >?

[sb327]

I’ve not studied the hammer yet.

To be able to tune via arduino, the valve really needs to respond digitally (on or off with little variation). As originally designed, it had (and still somewhat has) a bell curve like a conventional valve. For tuning to pressure, the ideal scenario would be a linear decrease in power on a single setting as tank pressure drops.

I am getting closer to that scenario but it has been challenging, which is fine with me because it’s been quite a joy. More failures than successes, lol.

I’m at work and I don’t have my personal computer but below is a snapshot of the oscilloscope after swapping over to the 22 barrel. I also decreased the main poppet lift to help speed the cycle of the valve.

As you can see, the pressure rise is a lot faster than when it was set up for 30 cal. Remember the throat id is .312”.

Dave