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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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Unread postAuthor: jon2680 » Wed Nov 01, 2006 11:23 am

why doesnt anyone use liquid fire or other ether based, engine start products?
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Unread postAuthor: joannaardway » Wed Nov 01, 2006 11:55 am

People do. It's not rare that someone will use ether, because it's rather powerful.
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Unread postAuthor: jon2680 » Wed Nov 01, 2006 5:05 pm

anyone one tried liquid fire? its ether in an aerosol can, used for starting desiel engines ect
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Unread postAuthor: jon2680 » Wed Nov 01, 2006 5:13 pm

sorry about that didnt mean to post the same thing twice.

I'm currently in the prosess of building a shc80 pvc potato launcher. I'm trying to find the right combustion area to barrle size ratio. also working on a venturi to get a better air fuel mixure. Any suggestions?
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Unread postAuthor: jon2680 » Wed Nov 01, 2006 5:35 pm

If anyone needs pvc fittings or pipe I'm the manager of a irrigation wholesale company
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Unread postAuthor: Hotwired » Wed Nov 01, 2006 6:34 pm

jon2680 wrote:anyone one tried liquid fire? its ether in an aerosol can, used for starting desiel engines ect


I think I've got a comparable can of "Easy Start" which seems to be mainly ether.

Theres posts about it being used as spudgun propellant and it seems to work fine.
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Unread postAuthor: SpudBlaster15 » Wed Nov 01, 2006 6:57 pm

Starting fluids are usually a mixture of diethyl ether, a rather large aliphatic alkane such as heptane, and a propellant, usually carbon dioxide from what I have seen. Gunk brand Liquid Fire and Instant Starting fluid both work very well, but I have yet to see a starting fluid with a diethyl ether content of more than 40% (per MSDS).
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Unread postAuthor: jon2680 » Thu Nov 02, 2006 10:28 am

Good to know, I'll try for my application. I'm currenrtly designing a large launcher. I'm thinking about using a fuel injection system off a car. it should give me a good fuel mixture. Basically it involves atomized fuel, that is compressed. Wont be using plastic though, going to go to our machine shop and use the cnc mill. Alos thinking potatos maynot hold up to the pressure, might make wood shells.
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Unread postAuthor: sjog » Wed Nov 08, 2006 11:03 pm

rite guard in the black can works for me . i cant get starting fluid to work or denatured alcohol in pump bottle. is brown can more powerful?
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Unread postAuthor: SpudBlaster15 » Wed Nov 08, 2006 11:46 pm

You need a very small amount of starting fluid. Around 1/2 of a second of spray works well in an average sized cannon.
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Unread postAuthor: sjog » Thu Nov 09, 2006 8:24 pm

thank's for the tip will try much cheaper than deoderant
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