First Pneumatic: P.A.P.A.

Just build a cannon and want to show it off? Post it in here.

Postby dd13 » Mon Mar 21, 2005 9:40 pm

wow,little over engineered,but original...i like it!!
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Postby Drew Rowland » Mon Mar 21, 2005 10:45 pm

There's no such thing as overengineering.
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Postby Mr.Plow » Mon Mar 21, 2005 10:56 pm

That is absolutely outstanding work. Congrats! I'm very impressed
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Postby ryanpowell167 » Mon Mar 21, 2005 11:56 pm

Very, very clean. AWESOME for your first. I would have loved to build a piston for my first but, thats about as powerfull as you get for pnuematics...You would have to build small as you go. I like how the sprinkler is in the end. Ya know, since the sprinkler is inside, there is pressure on it, as well as in it. If there is equal pressure as on inside, wouldnt it mean that you can go above the 125psi limit on most valves. It would be crazy, seeing as how the piston would probably break the gun but it would be cool.

*EDIT: oh yea, chip the shells off of newer golfballs, makes great ammo for 1.5" and they dont break like you think they would.
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Postby tim jones » Tue Mar 22, 2005 1:24 pm

Your inogural entry to the pneumatic relm is most impressive. My first coaxial looked like crap compared to yours!

Did you consider building P.A.P.A. with barrel interchangeability? I only ask because you have enough chamber volume and valve flow capacity for a 2" or even 2-1/2" barrel.
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Postby SMOMW » Tue Mar 22, 2005 2:48 pm

Ryan, I don't know much about valves and stuff, like i've said I'm just lately getting interested in pnuematics, but it seems to me that having equal pressure on the inside and outside would keep the valve pretty well intact... it'd be like having a bubble, as long as a bubble has the same amount of pressure on the inside as it does on the outside then it will not pop... of course some has to do with the tension of the film of soap...... but that's not the point...

However, isn't one part of a sprinkler valve not pressurized? or is both sides pressurized and the part connected to the blow valve like a pilot chamber that when exhausted opens the valve?

so let me get this strait.. this is a piston gun that uses a sprinkler valve to open it right? kina crazy....
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Postby Freefall » Tue Mar 22, 2005 3:07 pm

Yep, one part of a sprinkler valve is non-pressurized. That would be the exhaust port. In this gun, the exhaust port is open to atmosphere via the fitting through the endcap.
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Postby utcpyro » Tue Mar 22, 2005 5:10 pm

If I'm not mistaken, it's the difram that's the weakness on sprinkler valves, not the body of it. I've seen some with burst pressures of 750 something PSI. Along with that, people have pressure tested the valves to 300 something PSI. That 6" air chamber would go before the sprinkler valve's body even if it was on the outside.
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Postby greeneyedboy5 » Wed Apr 20, 2005 11:26 pm

oooooh i likey. I likey alot. gj
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Postby somexone75 » Thu Apr 21, 2005 1:08 pm

please don't bring up dead posts
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