That would be pretty sweet. Keep us updated.

If it were me, I'd go with an HPA tank, either a SCUBA tank or a large paintball air tank. That's the problem with pneumatics and even higher mix hybrids: you gotta get an air supply out to your shooting area. I use low mix hybrids and a regular bike pump. In your situation I'd go with HPA because I...

Good to see you back here. I'm pretty sure Larda still holds the record for the most extreme hybrid, barring the circus man-caliber sized cannon VERA of course. No way anyone passes VERA in the energy category without some serious resources and permits and all kinds of crap. It's a 2X hybrid the siz...

Apparently it was a "hot" loaded round, he was very lucky that one of those lugs didn't kill him. That's what he thought, but there was a bit more going on. The sabot material was building up in the barrel, and the signs where there, he did say the shots were going off target and the recoil felt di...

I agree with JSR. I wouldn't expect any major revolutions in the airgun world, but instead continued incremental evolution and possibly changing popularity trends. You can already buy a PCP semi-auto that will shoot the wings off a gnat. What would really get me excited is the commercialization of S...

Very cool. I made a tennis ball cannon in high school from a rolled and welded sheet like that. It worked perfectly and I bet yours will too.

Is this a vented pilot design? I worked the numbers for an 8X mix and a 75% of maximum opening pressure for the piston. Same pressure in the pilot as the preignition chamber pressure. I get a pilot piston diameter of 16.73mm (assuming a 6.5mm piston diameter chamber side), so basically the same as M...

Nice cannon. You're taking a significant risk by using PVC with that much pressure inside. It can fail within it's rated pressure for no apparent reason because it's plastic and it tends to be fragile. It won't just crack, split or tear, but it will fragment and explode in your face. Wear safety gog...

Does the small o-ring pass over a port while under pressure? If so, it's like running the o-ring over a cheese grater. You might try a different shaped o-ring, such as the X shaped ones. They have much less friction when squeezed, but there would still be friction caused by pressure. They might work...

Thanks for the explanation. Now I get it. Like you said, the o-ring isn't supported from the outside, so it stretches and just comes off the rod when you shoot it. I agree that a harder o-ring is the best experiment to try next. If all else fails, you can try to modify the valve with a sealing face ...

The damage video was fun to watch. This was a great project.

Based on your shown areas, I got 1143 psi chamber pressure for equalization, so the same that you got. It looks like this is an estimate though because it looks like you clicked the surfaces and there are chamfers on them, so the actual diameters will be a little larger, but it should be pretty clos...

Potato caliber, lime caliber, golf ball caliber, and soda can caliber are all readily available in my local area.

You can use X-shaped o-rings to reduce friction. I use them on my piston with standard o-ring compression and I can easily move the piston by pushing it with one finger.

The legend returns! Looking nice, Solar. I hope to see some video action at some point.