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first mini... not sure about fuel

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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first mini... not sure about fuel

Unread postAuthor: cenzo188 » Fri Mar 07, 2008 5:33 pm

This is my first mini combustion. I used an old pill bottle, a pen tube, and a BBQ lighter salvaged from my first conbustion (which failed). Only problem is im not sure what fuel to use. I dont want to rupture the medicine bottle (or its lid). Pix are below.
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Attachments
100_2507 p1 [800x600].JPG
the gun
100_2510p2 [800x600].JPG
top
100_2514p3 [800x600].JPG
chamber
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Unread postAuthor: jrrdw » Fri Mar 07, 2008 5:35 pm

Use butane out of a lighter. About 4 seconds worth.
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Unread postAuthor: Novacastrian » Fri Mar 07, 2008 5:47 pm

I agree with Jrrdw, use butane. My suggestion includes a can of said propellant and a syringe, hey presto- Metered fuel, works a treat.
Figure out your chamber capacity then you can figure out how much butane to use, something as small as your cannon would probably need around 5cc's of butane (the proper ratio for butane is 3.2%).

Happy Spuddin :)
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Unread postAuthor: cenzo188 » Sat Mar 08, 2008 1:37 pm

hey, thanx. 4 cc's worked just fine. I shot a sharpened q tip a centimeter into my garage door!
now off to do more shooting
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100_2519p.JPG
the q-tip stuck in
100_2521p.JPG
the sharpened tip
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