If my gut is right, making the baffle shorter (increasing volume of the chamber that has the spark gap in it), will decrease performance (decrease the step function effect). According to the study that inspired hectmarr's other thread, peak pressure should increase, but for a smaller effective volu...

I had this project in mind for quite some time, and I have finally finished it. This is this .22 caliber pistol that fires common pellets, associated with a rupture disc. The advantage is that the weapon can be supplied in the same way as a common, commercial compressed air gun. It has an inverted l...

It's been a long time but I will be getting back into cannons again soon. Good to see some familiar names again

The video I owe around here, of the single pump pistol. In this case, they shoot 1/4" steel bb^s. I have currently switched ammo to 0.23 gram airsoft pellets ; It has about 3.5X and the performance is very good. https://youtu.be/QsRumkMX9NQ?si=n4GxjqizYdjECYNE The operation of the gun in the video i...

I made a tennis ball cannon using a 3” sprinkler valve. It fires a ball at ~150 yards at just 30 PSI. The valve is manufactured by Dorot, repackaged by Galcon, and sold by Drip Depot. The stated flow rate is 390 gallons/minute which is 10x the flow rate of an average 1” sprinkler valve. The valve is...

Hey all, I am building a combustion potato cannon for a school project, a 1.5 inch ABS pipe based cannon (yes I know, pretty risky seeing how people see dmw ABS with its pros and cons here, also because I made the mistake of not researching beforehand), posting about it to get feedback and criticism...

Well, this is a bit awkward, tried to post this a really long time ago but regardless its on here, much appreciation and thanks PCGUY! :D Regardless, the current cannons design, New stuff: gas metering and injection, the thing is a fairly small but it works well regardless at 20-40 psi worth of buta...

ITWOST: Got some new camera gear and figured I'd take a closer look at one of the "good" piston valves I've made recently. https://youtu.be/SVZjXHcsJnk There's a lot more work on the completed project because I want to do silly sh*t, but another small anecdote: you ever head of FOGBANK ? It's some s...

ITWOST: not much going on. Just felt like letting you guys know I haven't forgotten about you.

Salut à tous je suis français et je vous présente mon fusil hybride blue king✌️ Très peu de français se lancent dans de tel projet j'ai l'impression... Quelques données techniques : mix 11 butane, disque de rupture en aluminium de 0.2 mm d'épaisseur Chambre de 182 cm3 et canon de 17.4 mm x 100 cm! É...

Voici l'image:



That looks fantastic, I like how you've incorporated 3D printed elements and impressive muzzle energy too, it must be very loud!

Interested to see the projectile, is the barrel a smoothbore?

Update on the current project and a little sneak peek: still lots to do (polishing valve seat, rebuilding piston to track more cocentric, some funny stuff with the barrel, a way to aim more better), but I managed to put a hole in my box spring with some supposedly "low power" testing and a plastic 1...

Unfortunately due to overzealous moderation of historical footage, my YouTube channel has been terminated and the content is no longer accessible. All the video footage I have shared on this forum since 2007 was uploaded there and the links are now all dead. I have however recovered most of the cont...