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Big ghetto pneumatic (40ft barrel :)

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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Unread postAuthor: noname » Mon Apr 23, 2007 8:53 pm

I should make a fun plinker like this one out of some 8." If someone can get me 2 8" end caps for under $20 each, I would be much obliged.
4880K142
Could get a couple of these of McMaster, but they're $30 each.
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Unread postAuthor: Fnord » Mon Apr 23, 2007 9:00 pm

I should make a fun plinker like this one out of some 8." If someone can get me 2 8" end caps for under $20 each, I would be much obliged.


Did you get the wrong topic by chance?
Im not sure a pneumatic this size is classified as a plinker :)
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Unread postAuthor: VH_man » Tue Apr 24, 2007 5:17 am

8'' PVC is also VERY EXPESIVE pressure rated..........
my local lowes sells it but in big red letters on the side it says NOT FOR PRESSURE...... that was a sad sight.........

(if anyone knows if this kind of pipe is ACTUALLY OK to use with pressure tell me. if so, i actually do have a contest submission................)
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Unread postAuthor: bboymatty » Tue Apr 24, 2007 6:52 am

haha thats great! looks like you have plenty of space to play!
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Unread postAuthor: skinner » Tue Apr 24, 2007 7:08 am

Seriously.

Im surprised the army hasnt rolled around to your place, asking if they can borrow that for a war.
Menacing, just menacing.

Cheers,

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Unread postAuthor: noname » Tue Apr 24, 2007 10:42 pm

Fnord:
Plinker, damn huge cannon, it's all the same. :D
VH man, I have 20 feet of the stuff, rated to 160 psi.
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Unread postAuthor: zeigs spud » Wed Apr 25, 2007 2:26 pm

omfg rofl that is frickin awsome!!!
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Unread postAuthor: paaiyan » Wed Apr 25, 2007 2:59 pm

That's sweet. You should load it up with lead sinkers and wad them. Try for spreadshot.
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Unread postAuthor: kansasfarmer » Sat Apr 28, 2007 12:36 pm

Is the end of the water tank dished inward or are both ends domed outward?
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Unread postAuthor: Billy Bob » Tue May 01, 2007 5:09 am

a piece of pipe I shot at a tree


:D
The gun is a really kick ass gun.

But the tube is to short. You waste the pressure.
If you dont make a bigger calibre please make a longer tube.
Please something like 32 feet i will progonsis you will shoot through a house !!! The potential energie in the chamber must be awesome !
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Unread postAuthor: Fnord » Tue May 01, 2007 8:41 am

@paaiyan: I made some cannonballs for 1" pipe. Ill shoot a bunch of them at something eventualy. right now Im trying to get my contest gun finished in time :)
@ kansasfarmer: one end goes in and the other is a dome.
@billy bob: I could make the barrel longer, but it is annoying already because I have to remove the barrel to reload. Edit: billy the barrel is 40 FEET long not 40 inches.
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Last edited by Fnord on Tue May 01, 2007 3:06 pm, edited 1 time in total.
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Unread postAuthor: kansasfarmer » Tue May 01, 2007 10:15 am

The end that goes in is dangerous. I would suggest that you keep the pressure below 60 psi. Even if you test a tank like that at high pressure and it holds it is no guarantee. Every time you fill it the dished end presses outward on the tank and stresses the welds. The dished ends of old water tanks blow out when people use them as air tanks, treat the dished end as if it is the end of the barrel, or find an old tank off of an air compressor.
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Unread postAuthor: Fnord » Tue May 01, 2007 3:15 pm

The only time Im anywhere near the tank is during firing, and the compressor is shut off. If it explodes Im not going to be exposed to shrapnel either, so Im not too worried.
Cant say the same for the car its sitting beside though :)
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Unread postAuthor: kansasfarmer » Tue May 01, 2007 5:48 pm

The dished in end will blow out the end if it fails should not be too much shrapnel.
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Unread postAuthor: Fnord » Tue May 01, 2007 5:57 pm

Those old water tanks have a glass lining, I believe. But no, there wont be any metal shrapnel other than the cap.
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