The valve is "honking", which happens when your pilot doesn't let out enough air and the diaphragm attempts to reseal itself rapidly. The included solenoid is usually very low flow, designed to pilot the valve at normal water pressure. Since air is compressible, you usually need more flow for your p...

"pure oxygen" and fuel? Maybe you noticed the vacuum pump hidden in the battery box that evacuates the chamber before filling it with "pure oxygen and fuel". I didn't notice much of anything since you just posted a video. ;) You sound pretty smart, we just tend to get nervous when people post pictu...

The first good combustion cannon that I built was powerful enough to make me crap my pants and it worked reliably. I made it out of ABS plastic pipe, but many use pressure rated PVC. The way I did it was I first researched the designs here and asked a bunch of questions. Take a look at over-under de...

I read spudblaster's hybrid fueling 101 which is stickied in the hybrid cannon forum. He told us how to do it, so I'll reiterate it here. I don't bother with any of this math myself because HGDT was thunk about so I don't have to do any thunking about fueling and I can just focus on my design. Here'...

Hurrah for new toys!

Remember that it's a question of when, not if

...I'm still pretty pleased with these two pics I took tonight.

Got the semi auto together enough to test fire, it seems to work, no magazine tube yet. The chamber and 1/2" valve are from my old 10mm ball bearing launcher so the air supply is probably over kill. The piston is from an old pneumatic cylinder that is cut down. The red block is aluminium. The princi...