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Over - Under 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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Over - Under C:B ratio

Unread postAuthor: nghiagero » Sat Jun 30, 2007 10:46 am

hi guys,

im new to the spud cannon world though i've played around with a few mini spudders in my day. Anyway ive got an enquiery about the design of Over/Under Combustion spudders when it comes to the C:B ratio, i was wondering when calculating the volume of the Barrel does this include the connecting bend from the combustion chamber to the barrel underneath?
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Unread postAuthor: keep_it_real » Sat Jun 30, 2007 10:56 am

The barrel starts where the potato is. Any area behind the potato that has fuel in it is considered the chamber. So in your case, yes it does.
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Unread postAuthor: nghiagero » Sat Jun 30, 2007 11:00 am

ahhh i see, thanks for that
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