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Good sizes?

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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Good sizes?

Unread postAuthor: Model12 » Thu Jan 03, 2008 8:22 pm

Tomorrow I am going to get the parts to make a cannon and I am wondering if these specs sound allright for good performance.

I'm thinking 3' of 2'' sch40 pvc, over under design using all 3/4'' and a 4-5 foot barrel of 3/4 inch for a barrel. By the way I am using a 3/4'' orbit watermaster for the valve, it leaks but I cant fix it. I'm open to suggestions because I dont know much, and thanks in advance for any help you guys have to give!
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Unread postAuthor: Maniac » Thu Jan 03, 2008 8:30 pm

i would use a 1 water master the are much better than a 3/4 one.
it looks good for your first hope to see it soon.
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Unread postAuthor: Model12 » Thu Jan 03, 2008 8:36 pm

Sad to say its not my first, I have just been dissapointed by piston guns not working :cry: but I just have 15 bucks sittin here and I wanted just a good average gun to have when I need to shoot stuff. :twisted:
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Unread postAuthor: bigbob12345 » Thu Jan 03, 2008 8:49 pm

I have a gun I recently posted which is very simalar to what you are suggesting the only difference is that the valve is 1in and the barrel is 1in.I would go ahead and make it but definatly use a 1in valve it will increse performance significantly.I would recomemd a 1in or 1.25in barrel over a 3/4in one but that probably doesnt matter.
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Unread postAuthor: BigJon » Thu Jan 03, 2008 9:08 pm

Well as far as barrels you could always make them interchangable by reducing them down to whatever size threads into the valve or whatnot. But like others said you would get much better performance with a 1" valve.
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Unread postAuthor: Model12 » Thu Jan 03, 2008 9:13 pm

okay then I'll save my cash for a better valve and make a nice one thanks guys 8)

Edit: Actually I just thought about it and my 3/4 valve leaks so I need a better one anyway, and I got a videocamera with my christmas money so you can expect some damage videos! :twisted:
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Unread postAuthor: daberno123 » Thu Jan 03, 2008 9:36 pm

how is the valve leaking? Is it fixable?
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Unread postAuthor: Model12 » Thu Jan 03, 2008 9:40 pm

well Its leaking out of the barrel and I have tried multiple things to fix it. Im pretty sure the diaphragm isn't sealing correctly :?
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Unread postAuthor: MrCrowley » Thu Jan 03, 2008 9:45 pm

Try cleaning it, there may be dust and sh|t on it. 8)
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