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Building propane-oxygen fueled launcher

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: super spuder » Thu May 17, 2007 7:32 pm

Well i got this from my well. I know it is not made of cast iron, but i will go to the junk yard and see what else i can scrape up. i would not mind something bigger either.
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trying to decide on a new project, probably something small.
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Unread postAuthor: sandman » Thu May 17, 2007 7:36 pm

have you put a magnet to it to make sure
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Unread postAuthor: super spuder » Thu May 17, 2007 7:45 pm

no. i will go and do that
Edit; went out to see, and the magnet sticks, but that is because it is steel :wink:
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Unread postAuthor: Insomniac » Fri May 18, 2007 12:52 am

And steel is an alloy which is mostly iron.
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
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Unread postAuthor: jimmy101 » Fri May 18, 2007 9:22 am

According to GasEq, stoichiometric propane in oxygen (at 1 ATM total pressure) gives a peak pressure of 250 PSIG at 3360C (6080F).

At 2 ATM total pressure the peak pressure is 530 PSIG.

Propane in air gives 120 PSIG.

Real world combustion guns don't usually get anywhere near the calculated peak pressure since the spud starts to move and the pressure drops. But, if the round jams then the chamber may get much nearer the theoretical peak pressure. 250 PSIG is close to, or more than, the pressure rating of large diameter PVC pipe. And, it is way over what a threaded cleanout plug will handle safely.

A metal gun, properly made, should be able to handle pressures in this range, even if the round jams in the barrel.

A rusty old hunk of iron, of unkown original use and specifications, is probably not worth the risk. It may look like minor rust on the outside but if it was used in a water system the inside may be in much worse shape than the outside.
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Unread postAuthor: super spuder » Fri May 18, 2007 9:40 am

like i said earlier, i am going to see if i can get a bigger tank that looks a little bit better. I will post pics of it when i get it.
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