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New hybrid chamber.Has it been done?UPDATE:pictures.

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: rna_duelers » Sat Nov 11, 2006 11:23 pm

So far everything about this argument has gone over my head :wink: But this cannon is in the early stages of construction.My uncle is going to weld a aluminium union to it when i see him next so probaly only a few more months....Hmmm that to far away dammit!
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Unread postAuthor: pyro86 » Tue Jan 23, 2007 12:46 pm

why not make a chamber fan
gas motors use liquid fuel(gas) and propane no problem
and there basicaly a automatic hybrid
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Unread postAuthor: CannonBall » Wed Jul 18, 2007 10:54 am

Propane won't turn liquid when used in a proper air/propane mixture.
I tryd to let propane turn in a liquid with air mixed.
Got a soda bottle treated with hot water then put in as much propane as possible. then turned my compressor on and pumped it up to 10 bars..
I didn't see any liquid....So a 11x mix would be possible.....

The theory is that pure propane does turn into a liquid when compressed pure.
But mixed with air the pressure ain't high enough to let the propane liquify
The force aplied on the propane monecules isn't enough cause air has a much higher liquify point.

Cannonball :booty:
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Unread postAuthor: Jumpin Jehosaphat » Wed Jul 18, 2007 6:40 pm

This topic is pretty dead, but since you dug it up I'll throw in my thoughts.
@Cannonball: If the propane in your bottle did liquefy it's volume would have been very low (tiny drops on the walls of the bottle), it's possible that the liquid propane remained a fine mist in the bottle. If the second situation were the case maybe you could get ignition at mixtures above 90psi. I'm convinced that if you let that bottle sit still for over an hour you would get propane droplets.

I'm still convinced that propane will liquefy even when mixed with air. I will compare it to distillation (in a backwards sort of way). Distillation works because the each component in a mixture has it's own temperature/pressure conditions for evaporation. Impurities in water do not change it's boiling temperature at a given pressure. Propane in air does not change the condensation temperature of propane at a given pressure. Reverse that, hold the temperature constant, the condensation pressure does not change if the temperature is constant. Propane will still liquefy at 90 psi.

Even if the propane isn't gaseous, if it doesn't collect immediately (it remains a fine mist suspended in the air) high pressure mixtures could still ignite. Can a fine mist of propane suspended in air ignite? If the is the case a few questions are raised... Are the explosions generated by this truly more powerful? Is it possible that the 4.2% mix used for gaseous mixtures doesn't yield optimum performance? Just how high can the pressure of a mixture be taken before performance begins to suffer?
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