I have a question about C:B ratios for metered propane combustions canons. I know from reading the test results at http://www.burntlatke.com that the optimal C:B ratio for a fixed size combustion chamber is ~.7 or .8 :1. My question is, If you added a larger chamber to a gun that was already at that .7 or .8:1 ratio, will it slow the velocity of the spud? My guess is it will do little for the velocity of the spud, but make a louder bang. I realize lengthening the barrel at this point would increase velocity.

If this question has been answered, I apologize. I have tried looking all over the net for a test with a fixed size barrel and varying sizes of combustion chambers.

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