Big coaxial piston cannon

[sonicst0rm]

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!

My Workspace

Exhaust System

Last place you wanna be standing

Little fins to support barrel in chamber

Piston mechanism before i glued


Piston Sealer

And the cannon, in all it's fury. This thign is big.

[iamthewalrus]

very nice cannon, are u using 1.5" sdr21 pipe for the barrel??

[spudshot]

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

[saladtossser]

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.

[iamthewalrus]

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??

[sonicst0rm]

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

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.

[beebs111]

u can also sleve 2" sch 40 into 2" sch 40 by cutting a slice out and making it fit, for golfballs

[drac]

I'm not quite sure what everything is for. I see the exhaust valve, but what is the Blowgun for.

[deathtodeer666]

Yeah I dont understand that either, and dosent the air come out the male nipple?

[beebs111]

i didnt really understand the way the piston works, is this the setup and if so what pressure does it work to

[Hayseed_Andrew]

Maybe it's a double-piston thingy, with a piston venting another?

[MisterSteve124]

1200 yards? Could he really acheive that?

[SpudStuff]

WOW this is a DEAD TOPIC. Over a year old.

[Hayseed_Andrew]

OOPPsssssssssssieeee, sorry guys, definitly my fault