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Wblteen's 4" coaxial

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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Wblteen's 4" coaxial

Unread postAuthor: wblteen » Sun Jun 03, 2007 1:59 pm

Barrel = 52"
Chamber = 51"
sleeved 2 inch golfball barrel.
1 inch moded sprinkler valve
3 inch end cap for piston
I am currently working on a tripod setup, this thing turned out to be a little heavier than anticipated!!
GGDT estimates with a golfball I get 586 fps @ 100psi
The gasket material I use doesn't seem to be able to stand up to the pressures, i get only a couple of shots and then half of the disk gets blown out of the barrel.
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Unread postAuthor: Velocity » Sun Jun 03, 2007 2:07 pm

Looks nice.. the gasket looks old and brittle though, thats probably why it is splitting. If you want a gasket that does not break, you might want to invest in McMaster Part Number:9013K262. It is a 4" x 36" sheet of neoprene rubber, 1/8" thick, that does not break. If I were you, I would also get a 1.25" metal fender washer to cover the rubber sealing face, so it will be more stable.

I really like this launcher; I myself have never be able to make a successful coaxial (though I have made over fifteen tee valves)... I want to change that soon.
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Unread postAuthor: mopherman » Sun Jun 03, 2007 2:08 pm

Very nice setup you got there! I hope you find some sturfier materials for you piston issues. May I ask, what is the black thing next to the gun in the fourth picture? Again, very cool
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Unread postAuthor: hi » Sun Jun 03, 2007 2:25 pm

thats cool. it must be fun to load.

what kind of bumper do you have?

have you tried shooting from your shoulder? just kidding.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: wblteen » Sun Jun 03, 2007 2:37 pm

The black thing next to the cannon is the pressure gauge which is attached. The gasket material isn't old at all. I bought a 6"X6" sheet when I bought the fittings. Thanks for the washer idea I will be adding it shortly.
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Unread postAuthor: spudthug » Sun Jun 03, 2007 2:59 pm

have you tried shooting from your shoulder? just kidding


noname jsut built a 4 inch coaxial and i think he shoudler fires it..maybe hip..or maybe im wrong...


btw nice gun! i am currently working on a coaxial... it has a inch inch chamber wiuth a 1/4 barrel..it is all done basically but i need to get a 1/4 pipe tap....then im done...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: noname » Sun Jun 03, 2007 5:12 pm

"noname jsut built a 4 inch coaxial and i think he shoudler fires it..maybe hip..or maybe im wrong... "

Which coaxial is this? My biggest PVC gun has a 2" chamber. :lol:
Nice gun, you should shoulder fire it, it'll be more fun. :P
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Unread postAuthor: spudthug » Sun Jun 03, 2007 5:19 pm

hmm it wasnt u? wait let me search i though it was u..srry..

EDIT: ahh...it was frankrede sorry for the confusion lol..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: PVC Arsenal 17 » Sun Jun 03, 2007 5:21 pm

noname wrote:"noname jsut built a 4 inch coaxial and i think he shoudler fires it..maybe hip..or maybe im wrong... "

Which coaxial is this? My biggest PVC gun has a 2" chamber. :lol:
Nice gun, you should shoulder fire it, it'll be more fun. :P


If you find that getting thrown on your ass is fun, go for it!
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Unread postAuthor: spudthug » Sun Jun 03, 2007 5:26 pm

maybe since ur rubber is breaking u should buy a rubber pipe to pipe connection and hose clamp that to your barrel..then u wont need that rubber..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: wblteen » Sun Jun 03, 2007 7:13 pm

Im just going to go with thicker neoprene and the washer. The rubber pipe to pipe wouldn't work, I would need to cut the length of the barrel down.
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Unread postAuthor: Velocity » Sun Jun 03, 2007 7:31 pm

Why is everyone so afraid of shooting from the shoulder? Yeah, at 100 PSI it would KILL, but at lower pressures (50-60 PSI) with a golf ball, it wouldn't be terrible, especially considering that the cannon is heavy.
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Unread postAuthor: pyromaniac » Sun Jun 03, 2007 7:40 pm

rmich732 wrote:Why is everyone so afraid of shooting from the shoulder? Yeah, at 100 PSI it would KILL, but at lower pressures (50-60 PSI) with a golf ball, it wouldn't be terrible, especially considering that the cannon is heavy.


I wouldn't be afraid if its pressure rated. i see no reason why. if you think about it if you wasi tfire it and it explodes you have pvc testies.
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Unread postAuthor: turbohacker » Sun Jun 03, 2007 8:11 pm

Nice gun.
I like the way you made the piston access at the other end of the gun, ive only ever seen it on the vave end- nice work :D
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Unread postAuthor: spudthug » Sun Jun 03, 2007 9:21 pm

if u hold it good enoguh and lean into it, it would be alrgiht to shoot...it would be awesome to shoot lol...u may get knocked on ur ass a few times but oh well..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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