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Chamber to Barrel Ratio for Propane cannons

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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Chamber to Barrel Ratio for Propane cannons

Unread postAuthor: MisterSteve124 » Sun Nov 05, 2006 7:54 pm

I read somewher that if you want to build a propane cannone you should use .8:1 C:B Ratio. I was just wondering if this is true? If not then I'll just stick with 1.5:1
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Unread postAuthor: Tater Salad » Sun Nov 05, 2006 8:31 pm

yes this is true. Some people might say that .6:1 is better but thats for efficiency. The better the ratio (.8:1, 1:1) the louder it becomes and the more energy is wasted. 1.5:1 is best for aerosol fuels.
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Unread postAuthor: MisterSteve124 » Sun Nov 05, 2006 9:04 pm

ok anyone else? sorry but I don't really trust someone with only 1 post.
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Unread postAuthor: SpudBlaster15 » Sun Nov 05, 2006 9:17 pm

He is right, .8:1 is optimal when using metered propane. However, 1.5:1 is far from optimal when using aerosol fuels, unless the fuel has an extremely low energy desnsity. 1:1 is closer to optimal when using your average aerosol such as right guard, axe, or other deodorants, all of which have similar energy densities.
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