Help with large combustion cannon

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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Cthulhu
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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.
This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
jimmy101
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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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