What kind of igniter are you using? And can you describe how you have the electrodes wired up?

You could also spring-load them or even just add a larger handle to the valve as well. I think with a few bucks worth of tubing/fittings, and a small 1/4" ball valve, you could really make those three sprinkler valves work a lot better as well though, all depends on what you want to do.

Neat! We need a few more details on how it works, it looks like there's 3 sprinkler valves and the chamber can't be the whole length of that bottom pipe (or could it?). Only suggestion I have is to pneumatically pilot the three valves instead of electronically. You can hear the diaphragm "honking" t...

jackssmirkingrevenge wrote: ↑

Fri Feb 26, 2021 7:43 am

Took it down to 600 psi and the results were very different:

So when do we get to see the unbalanced spool valve that opens with the anemic 19th century hammer at 3 kPSI?
(just kidding)
Good job noticing what the problem was. Much better fix than machining a spacer.

Nice! That mainspring certainly is the "folded from a piece of spring steel" kind from percussion and flintlocks. Absolutely beautiful and amazing it still works today compared to modern springs from only a few decades ago. :D How finely have you tried adjusting the distance between the barrel and v...

Hmmm.
You know, a PCP using nerf darts wouldn't even have to use that high of a pressure.

Just dropping in a couple of weeks late to say: looks nice and hope to see some more progress.

Nice build! Sorry you couldn't get that valve to work, for future reference, a barrel-sealing valve is a lot, lot easier to build (I built my first one and "controlled equalization" with some duct tape and petroleum jelly around some solid PVC rod) and usually performs better to boot (depending on t...

jackssmirkingrevenge wrote: ↑

Tue Feb 09, 2021 11:23 am

I'm guessing you had missed this one? viewtopic.php?t=26708

I DID, nice.

Also lol at hectmarr's last post.

Yep,

Regardless of how much I'm annoyed I can never make the investment in time and resources to get started 3d printing, it is the future.

If you can make a 9mm carbine with 3d printed parts, there's no reason you can't make spudgun parts.

Second here for using a burst disk and syringe metering. In terms of complexity, the next step up from that would probably be manometric (using chamber pressure to measure fuel and air) fueling. The type of fueling SB15 uses on his cannons is volumetric ("air through meter" design which is pretty ac...

Straaaange timing, both this post and me happening to check my "Spudfiles" label in gmail. The 1322 I want to "breathe on" is in the mail right now. (along with a steel breech and longer barrel) I still have to source the 1389 pump handle for a "1389 clone" (which was difficult in 2008, I can't even...

Let's do the math for puff metering a hybrid with a closed chamber. We'll use numbers a bit different from mine, to make the example clearer. I've sanity checked the result and double checked some of the math, but if someone wants to check and verify (both thinking and actual math) it's appreciated...

Nice job on the circuit. I'm a man that can appreciate the work required to compact something onto perfboard. If you're interested (probably not given the work put into the current iteration) an ATTiny takes up even less space but that's not always a priority. The TMBA's meter is pretty much it. You...

Nice! I had dreamed up something similar in the shower, but using a fuel injector and alcohol since it would be easier to measure the amount of fuel injected vs. pulse width. Your idea of placing the outlet underwater under an inverted graduated cylinder was a good idea, maybe I could look into doin...