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First Combustion Rifle/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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First Combustion Rifle/Cannon

Unread postAuthor: wolfgang22 » Sat May 13, 2017 2:42 am

Hi all,
this is my first post on this site, so I apologise if I have done something wrong or put this in the wrong place. I have built a couple of extremely simple pneumatic cannons (for bait launching) before but never a combustion cannon before, so I have a few questions. The first of which - would a long, thin chamber under the barrel work? I had planned on building a rifle rather than a cannon, and wanted it be bullpup with the chamber much like a pcp air rifle, under the barrel for shorter overall length. If this is not feasible I'll try to model it after the AirForce Candor,. And my second question - how do I build a simple bolt/breech? I have seen some quite neat ways of building them on the forum but they are far too difficult for me to build :lol:. I will be shooting heavy nail darts, and wax slugs from a 1/2'' barrel if that helps...
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Re: First Combustion Rifle/Cannon

Unread postAuthor: farcticox1 » Sat May 13, 2017 10:14 am

first one I ever made just has a sleeve over the barrel
Image

You might need more of a slot for nails though :idea:
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Re: First Combustion Rifle/Cannon

Unread postAuthor: jackssmirkingrevenge » Sat May 13, 2017 8:04 pm

Welcome!

I'll make the point that a smaller caliber combustion is likely to be a disappointment in terms of power, the smaller the caliber the more pressure you want and a combustion cannon is limited in this area.
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Re: First Combustion Rifle/Cannon

Unread postAuthor: wolfgang22 » Sat May 13, 2017 9:22 pm

farcticox1 wrote:first one I ever made just has a sleeve over the barrel
Image

You might need more of a slot for nails though :idea:



thats a pretty sweet looking rifle/cannon there Facticox1! I'll definitely just use a sleeve over the barrel. Thanks for the advice Jacksmirkingrevenge, I'm just trying to build a low powered rifle for putting little holes in things out the back :D. High powered launchers coming soon...
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Re: First Combustion Rifle/Cannon

Unread postAuthor: farcticox1 » Sun May 14, 2017 12:14 pm

This is what the whole thing looks like
Image

Have progressed a bit since then, still using a sleeve over the barrel though
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