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Big coaxial piston cannon

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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Big coaxial piston cannon

Unread postAuthor: sonicst0rm » Tue Jun 28, 2005 7:59 pm

check it

Here it is! Wohoo, finally done. Took me 3 days to construct, but I made sure i constructed it well. Man, this thing packs a wallop. We hooked it up to my dads compressor, and when i flipped the valve, wham, a wall of air came out. This thing is a monster. Im still dizzy from all those PVC fumes, because i glued everything today, and it literally took me ALLLL day. But it was worth it. It also cost $70...burned a hole thru my wallet.

It will shoot a golf ball approx. 1200 yards. i dunno if it's illegal or not, but the cops probably won't have a problem with it as long as i don't shoot anyone, or i give them a demonstration of some sort.

DIAGRAM of how this piston-exhause valve works.
ALL PICTURES

Plans Here!

ImageMy Workspace

ImageExhaust System

ImageLast place you wanna be standing

ImageLittle fins to support barrel in chamber

ImagePiston mechanism before i glued

Image
Piston Sealer

ImageAnd the cannon, in all it's fury. This thign is big.
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Unread postAuthor: iamthewalrus » Tue Jun 28, 2005 8:56 pm

very nice cannon, are u using 1.5" sdr21 pipe for the barrel??
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Unread postAuthor: spudshot » Wed Jun 29, 2005 4:33 am

that looks like sch40 to me, i think its 2"

walrus, if you were planning on using SDR21 for a barrel in a coaxial you NEED to sleeve it, a long time ago someone's barrel busted in their piston gun because SDR is too thin
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Image

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Unread postAuthor: saladtossser » Wed Jun 29, 2005 6:14 am

i like it, i like that exaust thing. how can you use the rubber coupling as a piston, i wanna know cuz this could solve some problems.
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Unread postAuthor: iamthewalrus » Wed Jun 29, 2005 8:20 am

ik it has to be sleeved in 2" sch80, but he said he shoots GB and that doesnt look like a GB barrel, it just looks like 2" sch40, does he wad the gb's or sum??
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Unread postAuthor: sonicst0rm » Wed Jun 29, 2005 9:19 am

It's 2" sch40. I wad it with dixie cups to shoot golf balls :D

Yes, I use a rubber coupler and a 3" end cap for the piston and sealer. Works great. I haven't tested at higher pressures, but no leaks or anything, its awesome. It was very cheap, too.


***EDIT***

damnit, i have no where to shoot this thing. I should have made a smaller one.
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Unread postAuthor: beebs111 » Fri Nov 04, 2005 9:44 pm

u can also sleve 2" sch 40 into 2" sch 40 by cutting a slice out and making it fit, for golfballs
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Unread postAuthor: drac » Sat Nov 05, 2005 10:09 am

Image


I'm not quite sure what everything is for. I see the exhaust valve, but what is the Blowgun for.
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Unread postAuthor: deathtodeer666 » Sat Nov 05, 2005 7:57 pm

Yeah I dont understand that either, and dosent the air come out the male nipple?
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Unread postAuthor: beebs111 » Sat Nov 05, 2005 8:08 pm

i didnt really understand the way the piston works, is this the setup and if so what pressure does it work to
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Attachments
piston.JPG
is this the setup of the piston?
piston.JPG (5.41 KiB) Viewed 3023 times
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Unread postAuthor: Hayseed_Andrew » Wed Nov 29, 2006 9:01 pm

Maybe it's a double-piston thingy, with a piston venting another?
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Unread postAuthor: MisterSteve124 » Wed Nov 29, 2006 9:26 pm

1200 yards? Could he really acheive that?
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Unread postAuthor: SpudStuff » Wed Nov 29, 2006 9:28 pm

WOW this is a DEAD TOPIC. Over a year old.
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Unread postAuthor: Hayseed_Andrew » Wed Nov 29, 2006 9:31 pm

OOPPsssssssssssieeee, sorry guys, definitly my fault
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