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small combustion

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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small combustion

Unread postAuthor: crsaz » Sun Feb 18, 2007 9:27 pm

I am going to build a small combustion cannon, I have a few questions.

Here are some details the chamber is going to be 2 inch sch40 pvc 2 feet long.
1. if I drill my ignition points just threw the side of the chamber will the strength of the chamber be compromised?

2. how small of a barrel can I use?
will a barrel smaller than 1/2 an inch be to small
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Unread postAuthor: A-98 » Sun Feb 18, 2007 9:41 pm

no it wont compromize the integrety (much, not enough to make it explode), but if you want to feel free to tap it into a double area.

and as for the 1/2 barrel will be fine
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Unread postAuthor: crsaz » Sun Feb 25, 2007 11:22 pm

I,ve got one more question, can I use a smaller barrel, like .25 inch inner dia? maybe I could shoot .243 bulletsout of a .25 inner dia barrel.
If I could that would be cool and the gun would be verry accurate

I was thinking that a berral that smal would create to much pressure. chamber is rated to 280 psi and the 1/2 inch barrel is rated 600psi all fitting are pressure rated.
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Unread postAuthor: c19o » Mon Feb 26, 2007 12:01 am

I dont think a small barrel would blow up your gun since combustion cannons have pressures under 80 psi
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Unread postAuthor: SpudBlaster15 » Mon Feb 26, 2007 12:12 am

A 2' long, 2" diameter chamber will yield very poor performance, unless you use around 5 equally spaced ignition points. It would be MUCH too large (volume) for your barrel aswell, unless you plan on using a 40' long 1/2" barrel, or a 160' long 1/4" barrel.

You can use as small of diameter barrel as you want, as the PVC chamber will easily handle even a closed chamber ignition containing a stoichiometric mixture of propane and air. Just remember that you must match the barrel and chamber volumes to each other to maximize performance; read more about this in the Spudwiki.
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Unread postAuthor: crsaz » Mon Feb 26, 2007 12:46 am

I dont care if I don't get the best performane out this gun.

I was thinking of making the smaller barrel by putting a small copper pipe in the middle of a 1/2'' sch 40 pipe and filling in the space wit something strong and dorable like epoxy but thatwould be really expensive. cold any one else suuggest somthing better?
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Unread postAuthor: A-98 » Mon Feb 26, 2007 12:53 am

expanding foam
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