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M3 look a like combustion cannon

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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M3 look a like combustion cannon

Unread postAuthor: jaffe » Tue Sep 25, 2007 2:13 pm

I was looking on youtube for any idea´s for a next spudgun, I found a video. It was a gun that looks like a AK-74 but use´s single shot combustion power :idea: . As combustion chamber they used a coke bottle. This will be my next project, only I wanna use the combustion chamber/coke bottle as stock. The reloading will be bolt action the only thing now is that I am working with cartridges(16MM CPVC), the cartridge holds the ammo in it but when I fired the gun I think the empty cartridge wont come out easily :roll: , so dus somewhone or anywhone now how to eject a cartridge. And are there any idea´s for a semi-automatic desgin without a shell/cartridge with a mixture.
GR.Jaffe
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 4:46 am

yu could have a gas pipe that comes off the barrel into the back of the chamber to 'blow' it out? they use this in assult rifles, i am tryin something simular
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Unread postAuthor: spanerman » Tue Oct 02, 2007 4:49 am

i doubt the blast from a combustion wont have enough power to blow that kind of setup back.....
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 4:59 am

i dunno if you get a thin enough pipe like a high pressure diesel injector pipe it might do
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 5:48 am

It won't work - firearms typically generate over 30,000 psi to be able to cycle the action, you can't use the same system using the 30-odd psi combustions generate.
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 6:15 am

u could do, yes they do use 30,000 psi but thats a firearm, this is a spud gun, springs ect wouldn't need to be a poswerful i think it would work
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 6:18 am

ill draw up some plans and you could have a look if you'r still in doute
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 6:33 am

I'm pretty sure it won't work at combustion pressures with a gas tube, your best bet is to have a direct blowback system, and unless you have a system for venting the chamber, reinjecting fuel and reloading the ammo you have to use preloaded cartridges.
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 6:36 am

yes pretty much, you could vent the chamber with a fan and i know it perimative but insead or preloaded cartages just have an amo loading system, and use a air freasher that works off a button but have a differnet gas in it that is triggered when the chamber opens????
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 6:38 am

you could have a compressed air/fuel mix nozzle that feeds the chamber that will remove the need for venting.
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Unread postAuthor: robbo@robbo » Tue Oct 02, 2007 7:00 am

not a bad idea, what about if you used propain, then it's already under pressure but you'd have 2 mix air too ?
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