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Help with large 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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Help with large combustion cannon

Unread postAuthor: Cthulhu » Fri Apr 21, 2017 8:29 pm

I'm making a combustion howitzer that has a 3 inch PVC barrel that is 6 feet long as the barrel, I know that I need a 1.5:1 ratio combustion chamber, but my main concern is heat. Will my Spud gun melt on the inside from this enormous combustion?
I also need to know if there are any tips for building these large cannons, such as sparker placement or reinforcing certain parts.
Thank you so much for your help, I will post pictures when it is completed.
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Re: Help with large combustion cannon

Unread postAuthor: jimmy101 » Tue Apr 25, 2017 12:25 pm

Your gun won't even warm up noticeably let alone melt. The combustion process generates a high temperature but relatively little heat.
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