Almost finished Piston cannon

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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bigbob12345
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Ive been working at this for a while and Im finnally almost done.Today I went to lowes to get some 1.5in sdr21 and got a ten foot stick for 4 bucks.I also got some other stuff to finish it.The chamber is 32in of 2in pipe.And the barrel is five feet of 1.5in sdr21.

heres some pictures

The piston
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Sealing face
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Piston with bumper
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Modded plug with exhaust assembly
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secondary champer to help piston seal
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The barrel
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The full cannon put together
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I didnt put it in the show case section because it is not yet finished.Any comment/suggestions are highly appreciated.If you want more info on the piston visit this link
http://www.spudfiles.com/forums/start-t ... 12801.html

Edit:250 posts red star yaah :wav:


EditEdit:Could some body please GGDT this for me
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bigbob12345
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Okay sorry for the double post but I finished this thing today and it was really powerful :twisted: .I have made piston valves before and I would like some comments on how I could make the valve even better and more powerful than it already is.
by the why I dont know why but this valve is very quiet for some reason.All my other piston guns have been very loud. Is this a bad thing.
And a GGDT on it would be nice too.
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elitesniper
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i think your pilot volume is way to big
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daberno123
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You got 1.5" sdr 21 at lowes? I've never seen any there
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bigbob12345
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elitesniper wrote:i think your pilot volume is way to big

What do you mean I have like no pilot volume at all its just a cut down plug that goes straight into the tee.You might mean that thing at the back of it thats a secondary chamber that I use to seal the piston beacause it doesnt seal when I just pump into it with my bike pump.

And daberno I was surprised when I saw it there too but they have lots of it its not all the lowes around me its just this one thats closest to my house.
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daberno123
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lucky you. :lol: next time i go i will have to root around in the back of the rack. I was able to find pressure rated 3" and 4" pipe doing that.
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bigbob12345
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Yea thats where I found it in the back rack.
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daberno123
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Was it all dirty and such when you got it? Cuz mine were. I had to give them a bath before using them :wink:
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bigbob12345
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Yea most of them were but the ones under neath all the dirty ones are pretty clean as you can tell by the pictures of the barrel.
Edit:Can anyone do a GGDT
and does anyone have any advice to make the piston better
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