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Propane, Pure Oxygen, and PVC

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: sandman » Fri Jun 22, 2007 11:06 am

SpudBlaster15 wrote:*Cues GasEQ*

Oxygen/Propane, 1atm - 18.181atm (267psi)

Atmospheric air/Propane, 4atm - 38.015atm (559psi)

Oxygen/Propane, 4atm - 76.28atm (1,121psi)

Keep in mind these are adiabatic values, and the actual combustion pressures (non adiabatic) will be significantly lower.


Im just wondering if anyone has a problem with these numbers, cause when i get my combustion gun done i might upgrade it to Oxygen, but i wont to make sure ill be safe
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Unread postAuthor: spudmonkey » Fri Jun 22, 2007 10:27 pm

what would a 4X hybrid do if it was filled with O2 and Mapp gas? cause woulndt that have a fuel load of aprox. the same as a 20x hybrid?
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Unread postAuthor: boilingleadbath » Sat Jun 23, 2007 6:59 am

In smiles notation, MAPP gas is a mixture of C#CC and C=C=C.
Acetylene is C#C.

See the similarities?

The extra carbon-carbon bonds make the chemicals more reactive, and so they share many of acetylene's properties - notably it's high burn rate.

Admittedly, the they aren't as reactive as acetylene, but it still seems... dumb to use them in a pure oxygen environment, especially considering how easily propane-O<sub>2</sub> transitions.
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Unread postAuthor: Scotty » Mon Jun 25, 2007 1:50 am

4 % oxygen and 96 % oxygen will not go bang.
The air you breathe has 21% oxygen and the rest is mostly nitrogen as said before.
Do some basic math and you will be able to work out how much propane you need ( around 4 times the amount you said.)

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