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Propane magazine

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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Propane magazine

Unread postAuthor: motorfixer1 » Sat Nov 12, 2011 6:38 pm

I am in the process of building a somewhat compact tennis ball launcher and would like to hide the mechaincal parts of the launcher inside the stock I have constructed. I cant seem to find the smaller propane cylnders some members have found, so instead of using a full size propane cylnder I want to make a resivor of some sort or a magazine if you will that I can refill myself. I havent seen anything like this yet as most folks seem to use a whole 1LB tank. I was thinking of cutting down a cylnder and welding it in the middle or something to that effect. Even a pipe nipple would work as long as I could get about 50 shots out of it. Some research has told me that I need a cylnder that is capable of delivering liquid propane like a camping cylnder or a non-OPD cylnder but thats about all I have found. The stock is 3" PVC about 20" long and has to hold a fuel source, power source, regulator, meter, and ignition. I have constructed a few launchers and this is more of a challenge as this is the first one where size is a concern.
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Unread postAuthor: Gun Freak » Sat Nov 12, 2011 7:40 pm

Fitting all that in a 3" cylinder would be a feat. Does it have to go in that pipe, or could you build a casing around the components?
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Unread postAuthor: jimmy101 » Sun Nov 13, 2011 11:43 am

You might consider using butane instead of propane. The lighter refill cartridges are pretty small. Here's one being used to fill a syringe. It should be possible to plumb it into an actual meter system.
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Butane cartridges are at much lower pressure than are propane but you'll get about the same number of shots per volume of liquid fuel and the energy is the same.
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Unread postAuthor: motorfixer1 » Sun Nov 13, 2011 4:33 pm

Similar to a Paslode nail gun. Excellent idea.
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