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How much fuel should I put in my cannon?

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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How much fuel should I put in my cannon?

Unread postAuthor: JABN » Mon Jan 24, 2011 1:46 pm

I made a "medium" spray n' pray cannon. Its not a a mini but not the normal size. The barrel uses 1in. pipe and the CB uses 2in. pipe. I was thinking of using the sering method for controling the fuel. The chamber has a volume of about 350mL. How much deodorant should I put in the chamber whith the syringe?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 1:53 pm

The syringe method only works for gas propellant. All you need is a syringe and cigarette lighter, inject about 12.5mL and you're good to go.
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Unread postAuthor: JABN » Mon Jan 24, 2011 2:05 pm

I have an old empty butane tank from a long nose lighter. Would that work if I refilled it.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 24, 2011 2:08 pm

If you have a refill can, you can use it directly :)

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Unread postAuthor: JABN » Mon Jan 24, 2011 2:21 pm

Thanks for the info I'll try that.

EDIT: I tried it out, the syringe filling when horribly. When I filled it the syringe didn't fill properly, but I ended up with a small amount of liquid butane. I threw the liquid butane into the combustion chamber and lighted it after it turned into gas. The shot was really good. I'll try getting a new syringe.
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Unread postAuthor: Crna Legija » Mon Jan 24, 2011 8:33 pm

did you have it upside down?
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