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filling a large chamber?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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filling a large chamber?

Unread postAuthor: A-98 » Sun Feb 25, 2007 11:16 pm

well, i am (possibly) going to build a bun with a large chamber (4" by 24", or 301ci) and i need a way to fill it to ~100 psi.

i dont have a compressor, and a bike pump would be un reasonable. i have considered a 12g co2 setup, but it would take ~3 per shot. a 20oz coz tank could be used, but i dont want to fork up the money for a reg. and a scuba tank is out of the question
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Unread postAuthor: noname » Sun Feb 25, 2007 11:31 pm

Don't make it. The cheapest way would be to get either a small compressor or a CO2 reg, and seeing as you don't want to spend the cash, I'd advise just to not make it, unless you want huge tri's from a bike pump. :lol:
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Unread postAuthor: Pete Zaria » Sun Feb 25, 2007 11:42 pm

You could buy multiple cheap plastic 12v car-tire type compressors. I've seen them for $10. 3 of them could do it reasonably quickly, I think. They don't last that long though.... A few hundred fills max.

Try craigslist (or something similar where you live), or watch garage sales, etc... for a used compressor.

You could steal the compressor from an old refrigerator (if you can get to it without releasing the freon in the cooling system, which is horrible for the atmosphere and also very illegal). I've heard of people converting a small, single-cylinder two-stroke engine into a compressor.

The only other options I can think of would be dry ice (problems with using dry ice in pvc....) or steam (again.... not in pvc....).

Peace,
Pete Zaria.
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Unread postAuthor: c19o » Sun Feb 25, 2007 11:59 pm

dry ice in steal chamber and transfer to pvc chamber.
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Unread postAuthor: A-98 » Mon Feb 26, 2007 12:10 am

what aboot propane?. i could hook it up with some fittings, and for amusement i could shoot my gun into a fire.

how much are propane refills?
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Unread postAuthor: frankrede » Mon Feb 26, 2007 7:55 am

$3 for a blue bottle where I live.
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