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Help with large 3" cannon

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: TG75 » Sun Mar 31, 2013 12:43 pm

How high of pressures? Would an average air compressor be fine?
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Unread postAuthor: RBurke83 » Sun Mar 31, 2013 1:58 pm

My compressor only goes to 90psi, I feel comfortable with malleable steel(sometimes called blackpipe) at prob 300 psi. That stuff is cheap at homedepot, and usually prethreaded. I was actually kinda sore after putting a blackpipe spring powered ball valve gun together a while ago - you really gotta put your back into it while tightening.
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Unread postAuthor: TG75 » Sun Mar 31, 2013 10:02 pm

Ok, so far I am looking at having a 5' long 3" PVC barrel and a 5' long 4" galvanized Steel chamber. What kind of power and range should I expect out of that?
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Unread postAuthor: mobile chernobyl » Mon Apr 01, 2013 8:13 pm

Did someone say 3" barreled cannon? :D

[youtube]http://www.youtube.com/watch?v=B2LyPH_EZgg&feature=share&list=UUdUpfZ3xfwQ2OrPkhxo5Z5Q[/youtube]

Sorry had to toot my own horn :P
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Unread postAuthor: TG75 » Mon Apr 01, 2013 9:25 pm

That is the exact design I have been looking for.
does anyone know what valve they had on it?
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Unread postAuthor: RBurke83 » Mon Apr 01, 2013 10:49 pm

Probably piston, its hard to see what that pull cord is attached to, so it could be a spool valve but i doubt it.
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Unread postAuthor: Technician1002 » Tue Apr 02, 2013 2:43 am

It's a piston.
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Unread postAuthor: mobile chernobyl » Tue Apr 02, 2013 6:38 pm

I originally built it with a 1" manually piloted sprinkler valve, when that failed I just through a spring loaded 1" ball valve with a string on it. It's probably fired close to 1000 shots by now and will most likely feature a viking funeral this summer due to so many thermal cyclings and UV exposure (it's been stored outside in NE USA for the last 3 years lol).

It was a fun gun, but PVC has it's limitations - mostly with regards to safety. My next 3" cannon will feature similar dimensions but constructed of heavy steel, featuring a road worthy trailer and gas powered compressor on board and designed for a 10X hybrid mixture :shock:
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Unread postAuthor: RBurke83 » Tue Apr 02, 2013 6:46 pm

The first mac and beef shot was my favorite.
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