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C:B Ratio.

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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Unread postAuthor: Karatedude13 » Mon Nov 27, 2006 8:11 am

joannaardway wrote:1:1 is in my opinion the best compromise - It goes Bang quite well, without too much power loss.

Personally, I prefer quieter cannons, because I live in a sub-urban area, so I keep my C:B ratios low for both combustions and pneumatics to avoid too much noise.

So, if building a combustion, I'd do it with a .7:1 to .8:1 ratio, and my Pneumatics tend to reside in the 1:1 to 1.5:1 ratio.

No. I tried multiple different combustion chamber sizes in my experiment. The 1:1 out-performed the 1.5:1. In other words, the 1.5:1 created more loss of power than the 1:1. That, and it was nice and LOUD. However, my longest shot was actually obtained using a 1.1:1 ratio, but its average distance was the same as the average distance of the 1:1.
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Unread postAuthor: SpudBlaster15 » Mon Nov 27, 2006 7:12 pm

Perhaps you should reconduct your experiments. Using a fixed barrel length, increasing the chamber size will result in an increase in performance, but a decrease in efficiency (moles of fuel to muzzle energy).
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