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Pretty frickin' big combustion

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Pretty frickin' big combustion

Unread postAuthor: noname » Tue Jul 31, 2007 11:20 pm

Just some big ass gun that cost me less than $20. The barrel (10 feet, 2" PVC) was 50 cents, the chamber (4 feet, 4" ABS) was 50 cents, and the BBQ igniter (4 sparks) was a dollar. All the other random fittings added up the rest. According to my calculations, I should be using 8-9 seconds of hairspray for the maximum bang, but only 5 seconds ignites. I think the problem is that the hairspray doesn't get into the front of the chamber enough. A chamber fan would help, but then I'd need a place to spray in the hairspray. Oh well, it's still strong enough to shoot through 2+ inches of wood with an apple.
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monstergun 007.jpg
Some other cheap stuff, another $1.50. It's a 1 1/2" union, a huge fire extinguisher tank, and 10 feet of 1" Sch 80 PVC.
monstergun 002.jpg
monstergun 001.jpg
The chamber. Yes, the screws are drilled through one layer of chamber. So sue me.
monstergun 003.jpg
Inside the chamber, I don't know why it looks so shiny.
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Unread postAuthor: hi » Tue Jul 31, 2007 11:24 pm

hole-ee-cow!!!!

i found that with my first spray combustion it worked to spray about half the fuel in, close it, up end it (so the barrel is on the ground) and wait a few seconds then open it and spray the other half in. that lets it mix up really well.
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Unread postAuthor: iPaintball » Tue Jul 31, 2007 11:25 pm

Sweet gun. I can only imagine the muzzle flash on that thing.

Where the hell did you get all that cheap stuff?
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Unread postAuthor: SpudBlaster15 » Tue Jul 31, 2007 11:26 pm

Holy crap, that chamber is massive. Definitely add a chamber fan, and just spray the fuel around it.

I think the chamber is going to crack in the places where the holes are drilled through one layer of ABS, such as what happened to my combustion.
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Unread postAuthor: noname » Tue Jul 31, 2007 11:28 pm

I guess I'll try it tomorrow. This is more of a ridiculous, maximum-5-shots-per-day kind of gun, because of the noise and destruction. The barrel should be around 20 feet for a good ratio, but I have nowhere near that amount of room (or sawhorses :D ).

Edit: I don't think so, SpudBlaster. I'm using crappy ass hairspray (along with the wrong amount), and you were using perfectly metered MAPP.

Edit #2, dammit. iPaintball, I get it at this place where you go and get rid of all the junk around your house. So far, I've spent about $10 there, and received over $100 worth of what stuff would cost.
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Unread postAuthor: iPaintball » Tue Jul 31, 2007 11:38 pm

I hate you. :evil:

Is it like a scrapyard?
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Unread postAuthor: noname » Tue Jul 31, 2007 11:45 pm

Kind of. I'll try to bring a camera next time I go. They have bathtubs, doors, more doors, more bathtubs, a bunch of toilets, a crapload of pipe, steel, ABS, PVC (some 16" PVC!), a bunch of the SDR sizes too, including 2," 2.5," 3," 4," just all kinds of stuff. You can also get CD's and recods for about a quarter each. I managed to get a sprinkler valve for 50 cents, and there's a couple of 50 gallon trash cans overflowing with random PVC and ABS fittings.

It's like a local junkyard, except organized, not just piles of junk.
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Unread postAuthor: origin unknown » Tue Jul 31, 2007 11:51 pm

Wow. Thats one helluva cannon you have there. Is the BBQ ignitor a battery powered one or is it a piezo. I would assume it a battery powered one because the piezo would have a hard time creating 4 sparks. Isn't the barrel bent at the tip in the 2nd to last picture? If so why didn't you cut the bent part off?
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Unread postAuthor: noname » Tue Jul 31, 2007 11:55 pm

Nope, it's a piezoelectric one. No one seems to understand that all you need for lots of sparks is, pause for suspense, small spark gaps! The barrel's bent a little, big deal. If I had another sawhorse or two I might be able to straighten it out.
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Unread postAuthor: iPaintball » Wed Aug 01, 2007 12:07 am

Your lucky. All the scrapyard around here are just piles of random crap.
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