Double barrel combustion gun

Post questions and info about combustion (flammable vapor) powered launchers here. This includes discussion about fuels, ratios, ignition systems and anything else relevant to launchers powered by igniting things like hairspray or propane.

Postby Iowaengineer » Tue Feb 06, 2007 9:58 pm

I just had a great brainstorm:
<img src="http://www.spudfiles.com/uploader/uploadFiles/scan0001.jpg">

I am already moving toward the next step which is getting a parts list ready, but I am not sure that it is safe enough to fire yet.

Any suggestions?
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Postby TurboSuper » Tue Feb 06, 2007 10:00 pm

Looks good to me.
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Postby An Apple Pie » Tue Feb 06, 2007 10:27 pm

Looks fine, but WHY?
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Postby Zorrowannabe9 » Tue Feb 06, 2007 10:33 pm

Well...
1. you have no ignition system
2. I believe that your ratio will inhibit performance (to much barrel)
3. I don't know where your going to find a bit that looks like that "splitter" (unless you are planning to use a T and a pair of elbows.)
4. Why?
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Postby An Apple Pie » Tue Feb 06, 2007 10:39 pm

Yeah it has a .6:1 ratio. That is including the fittings on the barrel. Not to bad, but the performance may suffer quite a bit from this. And once again why do you want to do this?
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Postby BewareOfDog » Tue Feb 06, 2007 10:44 pm

I made one, years ago, and it worked like crap!
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Postby sgort87 » Wed Feb 07, 2007 12:00 am

Actually, he hit the C:B ratio right on the spot. Since you all keep forgetting, I'll remind you once again that the optimum ratio for combustions using potatoes and other low-friction projectiles is .6:1. .8:1 is for rubber gasket slugs which act differently on the barrel.

What I would do, since these tend to work like crap as DR said, is make the barrel interchangeable with threaded adapters. This way you can put a useful barrel on that gun after you get pissed at the one you have designed for it now.
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Postby Iowaengineer » Wed Feb 07, 2007 12:39 am

For all those that ask why, well why NOT. If I can build and test, which would probably take some time, I would love to be able to shoot two instead of one. Its double your pleasure!
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Postby TurboSuper » Wed Feb 07, 2007 7:32 am

Better plan: Just build two seperate cannons, secure them together with a pipe strap, and then wire two ignition gaps in series with the lighter.
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Postby An Apple Pie » Wed Feb 07, 2007 9:39 am

Sgort, Weren't those tests done with propane. I have always heard .6-.8 for propane and around 1 for aerosol.
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