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Propane Pneumatic

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: mega_swordman » Sun Apr 22, 2007 2:16 am

It should work because yes, for propane or any other fuel to ignite, there is a air to fuel ratio. Too much or too little fuel will not ignite.
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Last edited by mega_swordman on Sat May 19, 2007 3:32 am, edited 1 time in total.
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Unread postAuthor: to_live » Sun Apr 22, 2007 3:10 am

i have a propane bb gun ready to be used sitting in my room, i just have to buy a new peice of brass for the barrel, it worked pretty well, at 10 feet it left dints in my fence with plastic bb's. ill take some photo's after!
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Unread postAuthor: hi » Sun Apr 22, 2007 3:11 am

it would be way cheaper to use propane. its like $3 a bottle and will give you a lot of shots. co2 needs a regulator, adapter, and the tank it self. all that is around $75-100. propane you need some hose, some hose clamps, torch head, a ball valve, and a bottle of propane. that would cost about $35.

so it $75-100 for co2 vs. $35 for propane, which would you rather have?
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Unread postAuthor: benstern » Sun Apr 22, 2007 1:43 pm

Mine gets 4-5 shots from one of those small cylinders. However my cannon is fairly large.
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Unread postAuthor: pyro6314 » Sun Apr 22, 2007 2:23 pm

why not try to make it a hybrid? Have the propane flow constant into a chamber with a burst disk that doesn't really burst but just releases the pressure at a set psi. Ive seen these in the oil field but you probably wont find a scaled down one.
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Unread postAuthor: mega_swordman » Sun Apr 22, 2007 2:28 pm

And now I know, :oops: it was sort of a no-brainier question. We always look dumber in retrospect.
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Unread postAuthor: pyro6314 » Sun Apr 22, 2007 2:35 pm

Technically, I would think you could make a hybrid out of a piston valve. Put a compressor relief valve behind the piston that is above the "charge" pressure. (say 160 if it were to be copper) When the propane ignites, the pressure difference should push back the piston decreasing the pilot volume until the blow off valve releases. While this is happening all the pressure is buggering off out the barrel.

I guess that technically counts as a set pressure relief valve or bust disk.

Edit: Sry, just realized this has been covered in the hybrid section.
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Unread postAuthor: frankrede » Sun Apr 22, 2007 6:30 pm

hi wrote:DR made one one time. he used a bottle of propane and a torch head. it was i think a tennis ball launcher. it looks really cool. It was on spud tech. ill see if i can get you a link. I think he also use a 1'' sprinkler valve.
That cannon is fun to shoot! but beware of any open flames around it while using it.
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Unread postAuthor: FeLeX » Thu May 17, 2007 1:14 pm

I am VERY sorry to kick up a "dead" topic but I thought of making a pneumatic propane rifle about a week ago and started looking arround to see if it was done before and aparently it has. I still want to do it but I still have a question. How many shots would you get out of a propane tank? For example if you have that tennis ball gun that DR made?
One more time, sorry to kick up "dead" toppic but I just didnt feel like making my own and then having poeple call me stupid for not using serach button.
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Unread postAuthor: wannabie » Fri May 18, 2007 6:33 am

Has any one thought of LPG? it would work fine wouldnt it?
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Unread postAuthor: ShowNoMercy » Fri May 18, 2007 6:46 am

LPG? What is that?
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Unread postAuthor: chaos » Fri May 18, 2007 7:06 am

LPG has bigger molecules but it would work the same as propane, i tried it and its not great but thats just me, un-metered i had about 100psi and i got more that 50 shots off with my s400
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Unread postAuthor: meatballs » Fri May 18, 2007 2:09 pm

LPG means liquified petroleum gas. aka propane. LPG would work fine, but LPG may also be a blend of propane and butane, which would lower the pressure. it should still work, just be sure the LPG is mostly propane. propane would have the pressure you need. LPG has the same risks and drawbacks as propane (obviously, since it is propane) but other than that would work well.
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Unread postAuthor: chaos » Fri May 18, 2007 5:49 pm

Yes i have tied it and it does work there are a few regrets after doing it though:

link: http://www.spudfiles.com/forums/pnuemat ... t7934.html
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