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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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C:B ratio

Unread postAuthor: Cpt Obvious » Tue Feb 07, 2012 2:24 pm

I read on the wiki of the BurntLatke study of C:B ratios. Using the second graph I calculated this.

With a 7" chamber of 2" sch40 PVC the inner volume would be roughly 27.489ci

A 36" barrel of 1.5" PVC would give me a volume of 73.289ci which makes a C:B ratio of 0.375, and according to the graph i should expect something around 400 FPS (which is my goal).

My question is did I read the graph correctly and Is this a reasonable expectation? I assume the study used metered propane and a standard potato, but did I miss something?
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 07, 2012 2:26 pm

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Unread postAuthor: Cpt Obvious » Tue Feb 07, 2012 2:29 pm

ah, thank you once again, just what i was looking for.
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