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My First Pneumatic

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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My First Pneumatic

Unread postAuthor: squeaks » Tue Oct 10, 2006 10:19 pm

Here's my first gun in progress. I researched for a while and finally decided on two things. First, I decided to make a chamber sealing piston, and second, I decided to go big. It has 2 4'x4" chambers and a 12'x2" barrel. I'm welcome to any sugestions since most of it is still slip fitted while I'm working on the valve assembly.

Thanks and hope the pic works.
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Front view of gun
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Unread postAuthor: rna_duelers » Wed Oct 11, 2006 3:01 am

SWEET gun.But mayeb the barrel could go for some suport from the chamber.Whats the C:B ratios?It looks like the barrel might be to long.But nice cannon,very nice.
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Unread postAuthor: MrCrowley » Wed Oct 11, 2006 3:27 am

wow frekin nice gun, i like the unique design/layout of the gun.hope the valve works for you,what parts are slip-fitted?i can see most parts are already glued and primed.
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Unread postAuthor: squeaks » Wed Oct 11, 2006 12:18 pm

I haven't glued on the chambers or the barrel yet and I'm planning on making a stand for the gun. I used the GGDT and it said the barrel should be plenty fine how long it is(hopefully).
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Unread postAuthor: PVC Arsenal 17 » Wed Oct 11, 2006 2:36 pm

really nice. How exactly does a chamber sealing valve work? I'm only familiar with the old barrel sealing valves.
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Unread postAuthor: rna_duelers » Wed Oct 11, 2006 7:18 pm

Come on people!This gun is awesome for a first timer where is the praise??What did the GGDT read out at?Whats the max velocity?Again nice gun and PVC Arsenel give the spud wiki a try you might be amaised at what you find.
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Unread postAuthor: squeaks » Wed Oct 11, 2006 9:19 pm

The GGDT was giveing varying velocities depending on the projectile. Anywhere from 750 to 350 fps. The farthest it was simulating was about half a mile.
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Unread postAuthor: Extrusion » Wed Oct 11, 2006 9:24 pm

Half a mile, 750fps, damn nice first pneumatic my first was a coke bottle lol.
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Unread postAuthor: ProfessorAmadeus » Wed Oct 11, 2006 10:15 pm

Wow! This is huge! I am quite amazed by how good this is. My first pnuematic was a simple spinkler valve and sucked. Does the pilot volume have to be so big or is that mostly a piston?
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Unread postAuthor: ProfessorAmadeus » Wed Oct 11, 2006 10:15 pm

Wow! This is huge! I am quite amazed by how good this is. My first pnuematic was a simple spinkler valve and sucked. Does the pilot volume have to be that big or is that mostly a piston?
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Unread postAuthor: squeaks » Wed Oct 11, 2006 11:36 pm

You're right, it's mostly going to be piston.
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Unread postAuthor: Benny » Wed Oct 11, 2006 11:49 pm

Jesus, pvc aresnal, reduce the size of ur pic in ur sig.

Thats a bloody nice first cannon, you should seriously put some barrel support on it though.
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Unread postAuthor: rna_duelers » Thu Oct 12, 2006 1:22 am

I think thats the job of that hightech box :wink: Its the barrel support.Cant wait to see some damage pics from this gun,i hope there will be some.
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Unread postAuthor: PVC Arsenal 17 » Fri Oct 13, 2006 7:56 pm

I search wiki on chamber sealing valves. no luck.
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Unread postAuthor: squeaks » Sat Oct 14, 2006 9:38 am

It's the same principle but instead of the piston sealing off the barrel, it seals off the chamber. Then you have a small equilization hole in the piston and a 1-way valve to leak air into the chamber.
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