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Help! Copper combustion rifle.

A place to ask general spud cannon related questions.
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Help! Copper combustion rifle.

Unread postAuthor: Urban Ninja » Sun Jan 01, 2006 6:10 am

Hi Im new to this site and was just wandering if you could build a combustion spudgun out of copper piping :idea: ? The chamber being 22mm and the barrel 15mm. I know that someone on this site has built the pistol version but Im really looking to build a rifle version. :?: Do you think it could even get the projectile out of the barrel? Ive never built a proper combustion before but loads of pneumatic, so i have no idea how to make one.
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Unread postAuthor: boilingleadbath » Sun Jan 01, 2006 3:41 pm

I understand that often people have trouble getting a proper fuel mixtures in long, thin chambers. I would suspect that the same problem would present it's self with multiple chambers.

So, let's say you put a 75mm long chamber on it (which should be short enough to avoid mixture problems). This means your barrel can be (at most) 230mm long ((22mm^2 / 15mm^2) / .7 * 75mm), for a total launcher length of some 300 mm... which is pretty short.

This could be fixed by using a larger diameter chamber or a smaller diameter barrel.
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Unread postAuthor: Urban Ninja » Sun Jan 01, 2006 7:47 pm

Thanks a lot. That really helps. :D
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Unread postAuthor: drac » Sun Jan 01, 2006 8:17 pm

How do you plan on igniting the fuel?
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Unread postAuthor: Urban Ninja » Mon Jan 02, 2006 12:02 am

Ill probrably use a BBQ ignitor, but do you think that a piezo out of a lighter would work? Thanks.
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Unread postAuthor: Technician » Mon Jan 02, 2006 8:31 am

I agree with boilingleadbath as small barrels present their own problem when it comes to getting the right fuel/air mix and ignition. The smallest useful chamber fan is around 40mm so that's out, yet it would really help if you had one.
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Unread postAuthor: spudshot » Mon Jan 02, 2006 12:24 pm

small chambers are a [female doggy] to get right, i found that out the hard way with my pocket rocket, about 1 in 10 tries would work, i've got it down to a science now, i use butane from a mini torch
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