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semi-automatic 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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semi-automatic combustion cannon

Unread postAuthor: Tom » Fri Aug 24, 2007 8:40 am

This is my first project in combustion cannons, the goal is to make a semi-automatic combustion cannon. The reloading of the ammo wil be with a gravity magazine, the feul injection will be injected thro the barrel with a piston. The schematics wil come... SOON :twisted: .
Greetings Tom
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Unread postAuthor: singularity » Fri Aug 24, 2007 12:11 pm

did you think about how your going to vent the chamber after every shot?
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Unread postAuthor: Tom » Fri Aug 24, 2007 2:04 pm

Yes, the feul mixture will consist 3/4 air and 1/4 lichter fuel.
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Unread postAuthor: Hubb » Fri Aug 24, 2007 2:16 pm

Venting in the chamber means replacing the used air with fresh air so the next fuel / air mixture will ignite. Maybe you should make a normal combustion first to get the idea of how they work (don't forget to search the forum to get the best ideas).
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Unread postAuthor: DYI » Fri Aug 24, 2007 2:21 pm

What kind of fuel are you talking about? With propane you need about 4% fuel and 96% air. With butane, it should be closer to 3%, and MAPP should be close to 5%.
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Unread postAuthor: Tom » Fri Aug 24, 2007 2:27 pm

It's a mixture of butane and propane.
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Unread postAuthor: Hubb » Fri Aug 24, 2007 2:31 pm

Why are you mixing the propane with the butane?
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Unread postAuthor: hi » Fri Aug 24, 2007 2:33 pm

you can buy canisters that have propane/butane mix at camping stores.
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Unread postAuthor: SpudBlaster15 » Fri Aug 24, 2007 2:37 pm

A mixture containing 25% butane/propane mix and 75% air will not ignite.
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Unread postAuthor: thespeedycicada » Fri Aug 24, 2007 3:28 pm

this might be too complicated for a first combustion try an advanced first if you want but not develop some totally new (i think) idea.
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Unread postAuthor: DYI » Fri Aug 24, 2007 4:21 pm

There have been semi-auto combustions before (Revolver X, for example), but they are immensely complex, due to issues with venting, rapid fuel injection, and overheating which must be overcome.
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Unread postAuthor: Novacastrian » Fri Aug 24, 2007 6:03 pm

Be sure to post those schematics, you may surprise us all :D :D
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Unread postAuthor: Redcoat » Fri Aug 24, 2007 6:34 pm

yeah, i'd like to see the schematics before you give up.Also why not a fa to vent the chamber? but you'd have to have a trigger for that as well. :roll: .

Happy Spuddin'
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Unread postAuthor: keep_it_real » Fri Aug 24, 2007 6:45 pm

you may surprise us all


but they are immensely complex, due to issues with venting, rapid fuel injection, and overheating which must be overcome.


this might be too complicated for a first combustion try an advanced first


yeah, i'd like to see the schematics before you give up



Jesus, guys... way to be optimistic.
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Unread postAuthor: origin unknown » Fri Aug 24, 2007 9:24 pm

Go manully rapid fire with a gatling style combustion. It is way more simple, just make 6-8 normal combustion cannons onto a revolving thing controlled by a crank which rotates the barrels and put the spark contacts on the back of all the cannons. Make it so that the individual cannon's spark contacts line up with a main back one on the frame when you rotate the barrels with the crank. Have the contact on the frame powered by a constant electrical ignition source such as a stun gun.
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