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Pneumatic Propane Power

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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Unread postAuthor: Hotwired » Mon Apr 30, 2007 11:54 am

mega_swordman wrote:For Chaos, Spudthug is partially right. Compressing a gas (in our case, propane) in a closed container raises the temperature. However, an interesting point I also read is the fact that propane, when over 100C remains in a gaseous form. So, whether you achieve enough pressure to raise the temperature can only be tested.


You're forgetting that you are not compressing propane when you get it out of the cylinder... It is turning from liquid to gas and expanding - in fact cooling down.

If you started with a load of gaseous propane and then squashed it you would raise its temperature.

To get propane from a cylinder to over room temperature you would have to heat it.
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Unread postAuthor: mega_swordman » Mon Apr 30, 2007 12:04 pm

Hotwired wrote: You're forgetting that you are not compressing propane when you get it out of the cylinder... It is turning from liquid to gas and expanding - in fact cooling down.


You're right! I forgot about the release of pressure. :banghead: If that is the case, then the cannon should work just fine.
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Unread postAuthor: chaos » Sat May 05, 2007 5:09 am

ummm ok


here is what i used it for and what i wrote to conclude this

http://www.spudfiles.com/forums/viewtop ... html#82715
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Unread postAuthor: integral » Sat May 05, 2007 5:57 am

Just wondering... what is the maximum pressure a conventional 2.5hp compressor can obtain? Would it be worth tapping a empty butane/propane blow torch bottle with a schrader and using that as an onboard air supply?
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