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new spudgun

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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new spudgun

Unread postAuthor: E-crown » Mon Jul 30, 2007 9:42 am

i would want some help i was thinking if i had a chamber that 75mm in diameter and 50cm long and a barrel that was 50mm in diamiter and 1m long can that work :?:
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Unread postAuthor: spud yeti » Mon Jul 30, 2007 10:17 am

You would get a C:B ratio of 1.095:1, which is fine. What pressure are you wanting to run at? The higher the pressure, the smaller the volume if you want the same results as a low pressure high volume chamber. It should be fine either way though.

BTW, you work out C:B ratio by going:
(chamber) pi.radius(squared).height of chamber
divide by
(barrel)pi.radius(squared).height of barrel
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really good quote/phrase here
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Unread postAuthor: f.c » Tue Jul 31, 2007 5:38 am

pneumatic or combustion ? i think it would be combustion and for combustion thats a fine ratio if you don't want a large amount of power. make the chamber and barrell longer and you're in.
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