An interesting BBMG project with the pressure ramped up and correspondingly impressive rate of fire:

Here are some details of the valve, first with o-ring in place and then slide down to show the groove: http://i.imgur.com/Zx2I8Hyh.jpg http://i.imgur.com/17IwsIWh.jpg Also interesting to note the about of wear happening the two areas where the locking balls contact, on the firing pin as well as the ...

Some design studies for a 12 gauge air cartridge

Excellent work as always, as I've said privately the fact that you've made it work consistently would be admirable even if looked like a bunch of random parts thrown together, but you've also managed to make it neat and stylish, kudos! The trigger guard integrated in the pump handle is really a nice...

Very cool - I've often considered this same concept in a 1" -1.5" bore configuration (more shoulder rifle sized than anything) but using the piston valve hybrid design so I could use generic round ammo without needing to reload a burst disc every time (golf balls or similar lol). Any idea of the muz...

Whoa, thats pretty amazing work. Very nice. I love the compactness of the whole thing. It's very clean.

Believe me, you really don't want me to join.

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...

Shame it's so quite in here. Ah well, the tinkering continues and holes are still being blasted though innocent cans :D Here is a second version of the flare gun cartridge with a steel chamber and aluminum piston. Fitted with a 6 inch long 0.75 cal barrel it's pushing empty 12 gram CO2 capsules at j...

"There may not be poets, but there will ALWAYS be poetry" :) Well said :D Here is what the new design looks like internally, roughly to scale: https://i.imgur.com/JdRFF9d.png The piston locking balls are now kept in place with a central ball, with the latter's centerline slightly biased to the rear...

Great stuff, it never ceases to please me to see your repeaters functioning so well! I look forward to the new project

Some interesting developments found on YouTube, an atmospheric pressure combustion cartridge gun that uses hydrogen and oxygen generated by electrolysis, and on top of it firing an "explosive shell" that also contains the same gas mixture with a piezo ignitor :o https://youtu.be/WlArhyaR8y8 https://...

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?

Merci pour ton retour il est construit entièrement en acier inoxydable, les matériaux en impression 3d sont très résistant et le canon est à âme rayé grâce à une presse hydraulique pour pousser l'outil via des rallonges pour 1m Le projectile est de ma conception avec une forme G1 Cb 0.536 https://i....