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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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Unread postAuthor: gabeb123 » Mon Sep 28, 2009 7:26 pm

in the rules it says flour is the only solid fuel we can discuss hear. how would you use flour?

do you brown in and put it in your cannon and shake it up really good and spark it?
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Re: flour?

Unread postAuthor: Ragnarok » Mon Sep 28, 2009 7:33 pm

gabeb123 wrote:in the rules it says flour is the only solid fuel we can discuss hear.

Not the only. You're allowed to discuss a fuel that is solid, provided it requires a gaseous oxidiser to burn. Hence, sugar, coffee creamer, etc... these would also be acceptable.

Anyway, you might find this link useful: http://www.spudfiles.com/forums/sugar-a ... t4082.html
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Unread postAuthor: jimmy101 » Tue Sep 29, 2009 3:48 pm

You need to get a very good suspension of the solid fuel. Fan(s) might not be enough, especially in a closed chamber. You might have to use compressed air and time the igntion with the blast of air.

It'll probably take a much stronger spark to ignite than what a typical BBQ piezo will do. A stun gun might be enough. I think you might have to go to an "electric match" or squib to get reliable ignition. (Easy enough to do, a 5 ohm or so resistor and a car battery or car battery charger is the simplest, there are many higher tech ways as well.)

Flour isn't used very often since it isn't fine enough and it's mechanical properties are two dependent on things like humidty. Non dairy coffee creamer is a common cheap and readily available fuel.

Go for it.
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Unread postAuthor: jaythedogg » Tue Sep 29, 2009 4:01 pm

Coffee creamer granules have alot of surface area for their size, relative to similar grains. Very good burn rate.
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