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Favorite Fuels?

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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Favorite Fuels?

Unread postAuthor: Karatedude13 » Thu Oct 19, 2006 2:41 pm

I know everyone has their favorite that they love to use. So what is it? And why? Personally, I've gotten the best results from butane.
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Unread postAuthor: Anon » Thu Oct 19, 2006 3:31 pm

I like propane. Its cheap and doesnt leave any residue and best yet is powerful.
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Unread postAuthor: Pete Zaria » Thu Oct 19, 2006 4:20 pm

Propane for the same reasons. A canister is $2.99 at Home Depot and I get 150+ shots on one (in my 200 cubic inch combustion). No residue, lots of power (very loud, too), and its cheap.

Butane works well too, but is more expensive and harder to meter precicely.

Peace,
Pete Zaria.
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Unread postAuthor: SpudBlaster15 » Thu Oct 19, 2006 7:08 pm

I have to use an absurd amount of pure propane or pure butane to get my gun to fire at all, but when it does it works very well, easily sending a spud 200 - 300 yards. I didnt realize that it had such a low stoichiometric ratio volume to volume with air. When I use Axe or diethyl ether, a one second burst sends a spud almost as far, easily 200 yards. Due to the fact that Axe or other deorderant sprays use both butane and propane as propellants, I owe the lesser spray duration to the fact that the contents exit the can in an atomized liquid rather than a gas, filling the chamber more quickly.
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Unread postAuthor: Karatedude13 » Mon Oct 30, 2006 3:19 pm

The Butane I use is in a lighter fuel canister, which is just liquid Butane in a spray can. Just put an atomizer from any other spray on the top of it and it's actually very easy to meter. You just need to hold the can upside-down in order to get the liquid, though. It's still pretty easy to do, and is very effective. My cannon has a chamber of around 150 cubic inches, and it fires potatoes more than 300 feet with just a 2-second burst of butane.

Did anyone else hear about the dude who tried using Nitrous as a propellant for a PVC gun? He ended up in the hospital with shrapnel injuries.
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Unread postAuthor: EatSpud!!! » Tue Oct 31, 2006 2:13 am

there is this stuff that they sell at my local kmart its likr 80% butane and 20% propane. it also cheap 4 cans of it for $7 AUD.
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