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First Double Chamber

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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First Double Chamber

Unread postAuthor: huskeyeskimo » Mon Apr 16, 2007 9:38 pm

This is my first dual chamber spud gun. The chambers are made from dual 2' lengths of 3" pipe. The shown barrel is a 4' piece of 1.5" pipe. I have both 1" rainbird sprinkler valves pneumatically actuateded by a single blowgun. I know the chambers aren't completely symmetric in their construction, thats just because I salvaged them from other gun I have been working on. Just wanted to see if I could get a larger one working. I've only tested it up to 60 PSI so far due to leaks I need to fill when it reaches higher PSI's. They are an easy fix with a little epoxy though. It has more than pleased me in the test fires.

I still have quite a few things I have planned for this. Upgrading the current hosing is an obvious first, since these are only rated to 65 PSI. Also plan on adding a plywood or sheet pvc brace to help keep the barrel stable. Hope yall enjoy it.
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Attachments
DCAM0096.JPG
View of the whole gun
DCAM0097.JPG
Close up of the valve set-up
DCAM0098.JPG
Business end of the gun

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Unread postAuthor: shud_b_rite » Mon Apr 16, 2007 9:46 pm

Man I cant tell if its just my screen or not but those pictures are very dark. Any chance you can lighten them up?
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Airbeds... so many different uses
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Unread postAuthor: huskeyeskimo » Mon Apr 16, 2007 9:50 pm

Yeah I know. I'll do my best to get new ones in the nest day or so. Using my video camera to take the pics and unfortunately it doesn't have a flash on it.
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Unread postAuthor: iPaintball » Mon Apr 16, 2007 9:50 pm

I love how you pneumatically actuateded the sprinkler valves. :lol:
But seriously, for your first pneumatic this is really good. I loike the paintjob too.
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Unread postAuthor: experament-u2 » Mon Apr 16, 2007 9:54 pm

nice work i like the paint job but it dose look a bit wonky with one bigger chamber
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Unread postAuthor: huskeyeskimo » Mon Apr 16, 2007 9:54 pm

Thanks, its actually my 2nd completed one. Have lots of in progress one as i'm sure most people do. It's just my first double chamber attempt. Yeah the pneumatic trigger seems to work pretty good. I was a bit worried that with it actuating 2 valves with one blowgun, it might restrict the airflow. Not sure how to test this though.
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Unread postAuthor: huskeyeskimo » Mon Apr 16, 2007 9:58 pm

The chambers are actually the same size. Mabe it's just the poor quality in the pics that make them look uneven. The barrel in the 2nd pic kind of looks like it may be the other chamber because of the angle. The only difference between the two chambers are the couplings used...unfortunately one is DWV, and one has a random 1/2 screw sticking out of the side.
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Unread postAuthor: mega_swordman » Tue Apr 17, 2007 5:11 am

Looks good, but is it just me or is the endcap on the left chamber (looking down the barrel/ first picture) attached with bolts :shock: ? Honestly, that's how it looks.
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Unread postAuthor: huskeyeskimo » Tue Apr 17, 2007 7:59 am

No its all sovent welded. I originally had it so the hose barb connecting the two chambers was on that side. But due to how I shoot from my house. It worked out alot better for me to make sure there schrader valve was on the right of the cannon. I just switched the sides of the chambers, put the hose barb on the opposite side, and filled the old hole with an extra 1/2" bolt I had.
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Unread postAuthor: Rayman_1337 » Sun May 06, 2007 1:01 am

How do you fill up both tanks at the same time? sorry, im looking to make a double chamber based off your exact design...i want to make sure i get everything right.
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Unread postAuthor: pvcmaster » Mon May 28, 2007 9:40 am

Im working on a double chamber too, and it looks as though he has hose barbs screwed into the ends of the chambers with a connecting hose, which is what i was planning to do.
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Unread postAuthor: CS » Mon May 28, 2007 10:55 pm

Noice cannon, I still haven't made a duel chambered launcher. Paint looks to have turned out really nice. All the connections are looking nice as well.

Just a few things if I may. If possible I would consider shorting the hose, as you may be hampering your potential performance with that length of hose. Also a support between the chambers, and barrel would reduce stress on some critical joints. Unfortunately aesthetically pleasing ones are hard to come by. Last of all I would suggest in future builds position all of the small protruding components in the cavity of your design. Below is some visual aid.

<img src="http://www.spudfiles.com/uploader/uploadFiles/017.PNG">

See if exterior components are mounted out of the cavity, they can be break when laid on a flat surface. Rather if they are in the cavity they are at least protected against flat surfaces. Hopefully that makes sense.
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