Posted: 05/04/2008 19:54 PM Post subject: Fat Banana Cannon- 2" bore-ASCO pulse from eBay.
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Joined: 25 Dec 2007 Posts: 46 193.36 Spud Bux
So, this is a cannon I made while I was at school in the welding shop. Its made from a 20LB propane tank and I tig welded the 1 1/2" standpipe on after using a dremel to cut out the old bung. I could have cut it other ways but I was worried about heat messing up the metallurgy. I'm guessing I could take the whole tank and standpipe up to the 250 psi working pressure of the tank but my ASCO pulse valve would fail long before that. Right now I have a 5' x 2" barrel on a 1 1/2" union fitting for storage. Only thing shot so far was a small nerf football and I never saw it leave the barrel. Actually I never saw it again even though I aimed for a tree. Needs a longer barrel since I'm going for the high volume approach rather than high pressure.
Sorry for the low light in the pictures. You get the idea though.
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Barrel attached in firing position.
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Two pass tig weld after painting, looked better without paint. My teacher approved of the finished weld (he's a CWI).
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Rebuilt, welded, and painted. ASCO pulse valve sitting on top, side is fill, top is fire.
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The cannon in its former life.
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Last edited by tansit234 on 05/05/2008 20:52 PM; edited 3 times in total
Wow... I actually started laughing when I saw that picture
It just looks so misproportioned. But way to go on the ridiculous chamber volume. It probably stays within 1 psi of the starting pressure throughout the entire barrel
That's why I dubbed it the Fat Banana, it just looks weird, I couldn't stop laughing while I had it hanging for paint. Super long barrel is on the way. I need to get a TB barrel ready and GB barrel as well as a longer full spud barrel (I hate half spuds 1.5")
EDIT: Test Fire Video. Good news its quiet, I get to use it without fear of noise complaints. Bad news, its quiet. Note: the cannon is pointed away from the camera, it sounds quieter than actual, and its darker than it really was.
ANOTHER EDIT: After doing some math the C:B is 6:1 (the tank is 1244 cubic inches or 5 gallons). I'm looking for about 2-3:1. The barrel needs to be a LOT longer....math.... 10 foot barrel for my 3:1 in 2" pvc, and 15 foot for a 2:1 in 2". (Hehe forgot to do math for round stuff instead of square earlier).
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