Propane and Oxygen

Post questions and info about combustion (flammable vapor) powered launchers here. This includes discussion about fuels, ratios, ignition systems and anything else relevant to launchers powered by igniting things like hairspray or propane.

Postby Wam Bam » Thu Jun 15, 2006 10:08 am

Is it safe to mix O2 and propane or O2 and MAPP in a SCH 40 rated gun?
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Postby GalFisk » Thu Jun 15, 2006 10:16 am

No (not a pure mix anyway). If it's equivalent to a 5x mix (I don't know how valid that comparison is, someone with the equipment should do some tests), you'll have >500 psi overpressure (theoretically).
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Postby Wam Bam » Thu Jun 15, 2006 10:27 am

Yikes....I'm glad I didn't try that one. I have the thing all hooked up and ready to go too. Had you not seen this I woulda been out in my yard blowing my head off ten minutes from now!
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Postby GalFisk » Thu Jun 15, 2006 10:38 am

That overpressure is for a closed chamber, but it's still not safe. A remote firing from behind apropriate cover, just to see what happens, would be cool though.
There's an O2/MAPP steel spudgun which I thought was on SpudFiles, but I can't seem to find it.
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Postby Wam Bam » Thu Jun 15, 2006 10:41 am

After reading the info contained in your latest post it sounds like I'd be firing more of a bomb than a gun. I still may try it just to see what happens (hehe).
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Postby flyingspuds2007 » Thu Jun 15, 2006 10:56 am

I can say that from what I learned with O2 and gasoline, it isn't the best idea to mess with O2, unless it is carefuly controled and you use a buffer gass like CO2 or N2 along with the mix, so you get a smaller amount of actual combustion. But that defeats the purpose of using O2 anyways...
The only real use I can see for O2 is an automatic combustion gun that uses it to skip the venting step(the longest wait in any setup).
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Postby DanielS » Thu Jun 15, 2006 7:50 pm

How did you adapt the oxygen tank to standard hose/fittings? Is it one of those red bernzomatic disposable ones? Every time I try to screw a torch head onto one, it won't work. Thanks:)
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Postby markfh11q » Thu Jun 15, 2006 7:52 pm

The threads are reversed, IIRC.
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Postby benstern » Thu Jun 15, 2006 7:57 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Wam Bam
[br]Is it safe to mix O2 and propane or O2 and MAPP in a SCH 40 rated gun?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

OMFG!!! I did not know that propane can combust without the presence of O2!! What else do you have to tell us oh enlightened one?
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Postby markfh11q » Thu Jun 15, 2006 8:05 pm

OMFG!!! You knew what he meant! O<sub>2</sub> = pure oxygen, in this forum's lingo. He would have just said "air" otherwise.

But if you want to look at it from a technical point of view, you're right. People use O<sub>2</sub> in their spudguns everyday...
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