Propane, MAPP and Oxygen

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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grendal
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Mon Dec 18, 2006 5:16 pm

No I have no intention of combining these three, however.

I was shopping for parts at my local Seed and Feed and they sell Propane, MAPP and Oxygen canisters all roughly the same size. Has anyone tried to combine oxygen with Propane or MAPP to improve combustion?

How would that change the metering of the Propane?
Would it improve if you used MAPP and Oxygen, how do you calculate the right ratio.
Would oxygen work as well as a fan?

Is is just a bad idea?

Thanks
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pyrogeek
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Mon Dec 18, 2006 5:40 pm

If you could meter them correctly, it would just be like having a hybrid. Well, sort of. You would just be able to burn more fuel.
A real hybrid is different, since the gases burn faster when compressed.

If you wanted to use the O2 instead of a fan, then I guess that would work. Just so long as you fired it with just regular air, and then injected just enough to bring the concentration up to 20% like normal air has. But, then you would probably still need a fan to distribute it evenly.

My dad actually suggested that I do this. And I would, but I don't have the money to build a gun out of Sch80 PVC yet, and I would have to buy a torch set to get the correct fitting for the O2 bottle, since it's left hand thread.
I'm not concerned with safety since I have a place I can test it safely, along with a remote ignitor, which just a 600K stun gun and a 100ft piece of speaker wire. (It's ghetto, but it works).
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spudmonkey
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Tue Dec 19, 2006 9:40 pm

well...yah my luck finily ran out, useing oxygen and mapp and now i owe my friend a chamber fan sch80 endcap and other crap.. so yah i have, and it defenantly helps but it will end up working TOO well eventually and shreds of pvc in you leg dont feal to good
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beebs111
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Wed Dec 20, 2006 5:13 pm

learn some good grammer,^^^^^^
and also there are more than 1 guns on this site that use oxygen and propane/mapp or even actelene
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sgort87
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Thu Dec 21, 2006 4:18 am

I love how you misspelled "grammar" and neglected to use it youself. There were capitalization, punctuation, spelling, and tense problems all in your two whole sentences. :P

Learn to use good grammar.

There is more than one gun posted on this site that use oxygen and propane/MAPP, and even acetylene.

But yes, his was horrid. Yours doesn't even begin to compare.

Carry on...
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grendal
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Tue Dec 26, 2006 2:10 pm

Thanks
I think I'll leave the MAPP and O2 for future attempts at mutilation and work on the metered propane animal I have on the drawing board.
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spudmonkey
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Tue Dec 26, 2006 3:28 pm

just use mapp or propane dont add the oxy, altho i dont listen to my own advice im makin a cannon spifically for mapp and oxy :D
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MikeNice
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Wed Dec 27, 2006 11:04 am

Someone needs to do the calculations to get the pressure spike for propane / oxygen and MAPP / oxygen. I really don't think using an oxidizer in a plastic gun is a good idea. I don't and wouldn't. Thats just me.
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Cao314159
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Thu Jan 11, 2007 5:19 am

Sorry to kick up a dead topic, but was there any conclusion as to the most efficient MAPP/oxy ratio? I would like to try this but I don't want to accedentially make too rich of a mixture. Thanks!
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