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Another Triggered Burst Disc Gun

Built a pneumatic 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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Another Triggered Burst Disc Gun

Unread postAuthor: noname » Tue Aug 07, 2007 11:05 pm

Basically a version of Gort's but much less complicated. The trigger is simply a sharpened dowel which an acrylic cube on the back, to push. A piece of brakeline goes into the chamber and the dowel rides inside of it.
The barrel is about 4 feet of 1 1/2" ABS, the union is 1 1/2," the chamber is 2 1/2 feet of 2 1/2" PVC.

Yeah, kinda sloppy with the primer, but whatever. I could paint it, seeing as I do literally nothing all day, but I like sitting around without doing anything.
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Attachments
hybridtriggerburst 001.jpg
hybridtriggerburst 005.jpg
hybridtriggerburst 004.jpg
hybridtriggerburst 003.jpg
hybridtriggerburst 002.jpg
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Unread postAuthor: turbohacker » Tue Aug 07, 2007 11:26 pm

Very simple.

What do you use for burt discs?

Also, how do you seal the wooden dowel aganst the brake line, Is it just that tight of a fit?
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<-- This is not a cat avatar

If it walks like a dog, sratches like a dog, and barks like a dog, than its probobly a...-TURTLE, it's a TURTLE!!! Cant you see?!!!

frankrede wrote:Great googlay mooglay!
Thats a beast!
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Unread postAuthor: noname » Tue Aug 07, 2007 11:37 pm

See the little circle with a bunch of JB weld on it? It's inside the gun, behind the dowel. That's a rubber washer. The spring pushes the whole assembly (except for the brakeline) back, so the washer seals against the brakeline, except when firing.
I usually use aluminum foil or mylar as burst discs.

Simple, but it works. It's the most pwerful gun that I've made, other than my hybrids and my huge combustion. The chamber is less than half the size of my 2" piston gun, but the 1 1/2" burst disc outperforms it very easily, even with a barrel 3 feet shorter.
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Unread postAuthor: noob of noobs » Wed Aug 08, 2007 8:09 am

Looks good! What are the results?
Also, this is a pneumatic one, right? Why then does it say: "hybridtriggerburst 002.jpg"?
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Unread postAuthor: noname » Wed Aug 08, 2007 10:03 am

I uploaded the new pictures of my steel hybrid along with the pictures of this gun. Yes, this gun is penumatic.
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Unread postAuthor: DYI » Wed Aug 08, 2007 10:14 am

Nice!

I've been trying to figure out a way to do this easily, but haven't built anything because the pressure differential trigger allows you to use a higher pressure than the disks would normally allow.

What kind of pressure do you normally run it at? What kind of ammo do you usually shoot, and what kind of muzzle energy is it getting?
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Unread postAuthor: noname » Wed Aug 08, 2007 10:19 am

A mylar disc bursts at around 90 psi, so I usually pressurize it to 80 or 85 psi. I usually shoor sharpened and rifled potato bullets (it really does help a lot), and the only way I know it's hit is hearing the BONGGGG sound it makes when it hits the sheet metal roof of the high school (about 200-250 yards). Not sure on the muzzle velocity or energy, but I'd say it's in the 400-500 fps range, with an 8 foot barrel (which I just remebered I had).
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Unread postAuthor: DYI » Wed Aug 08, 2007 10:26 am

I've never really shot mine for distance, but I bet it could shoot over 500 yards with some proper ammo and the 12' barrel. Have you done any damage shots yet?
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Unread postAuthor: noname » Wed Aug 08, 2007 10:33 am

Nope, because my compressor is about 50 feet from my backyard, where the damage occurs. Using a bike pump isn't too tedious, but it gets anooying, because the rubber washer has sprung a leak.
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Unread postAuthor: dauphinoise potato » Wed Aug 08, 2007 10:45 am

Nice does it leak a bit or is it completely airtight?
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Unread postAuthor: spud yeti » Wed Aug 08, 2007 11:39 am

dauphinoise potato wrote:Nice does it leak a bit or is it completely airtight?

Quoted from noname:
noname wrote:the rubber washer has sprung a leak


Nice looking cannon btw, good work
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really good quote/phrase here
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Unread postAuthor: iPaintball » Wed Aug 08, 2007 6:58 pm

Very nice! I don't think I've ever seen a trigger like that before.
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Summer Projects:
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Unread postAuthor: potatoflinger » Wed Aug 08, 2007 7:28 pm

That looks like it could have quite a bit of power, great gun :)
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