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cannon idea need some help

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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cannon idea need some help

Unread postAuthor: [insert name] » Sun Aug 10, 2008 2:09 pm

so me and one of my friends are building our second pneumatic potato cannon, so we have a little experience. This time around we are going to run the cannon off of compressed air from a bottle, like the kind on paintball guns.

how would we get the air into the air chamber. we were planning on using steel pipe because that seems to be really strong.

also what kind of valve could we use because a sprinkler valve doesnt hold back the pressure were after. [/img]
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Unread postAuthor: starman » Sun Aug 10, 2008 2:21 pm

The standard quick release systemfor air tools works great. How much air were you planning to put in there?
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Re: cannon idea need some help

Unread postAuthor: SpudFarm » Sun Aug 10, 2008 2:29 pm

[insert name] wrote:so me and one of my friends are building our second pneumatic potato cannon, so we have a little experience. This time around we are going to run the cannon off of compressed air from a bottle, like the kind on paintball guns.

how would we get the air into the air chamber. we were planning on using steel pipe because that seems to be really strong.

also what kind of valve could we use because a sprinkler valve doesnt hold back the pressure were after. [/img]


you should use a 2" steel chamber out of sch 40 and a 1.5" steel barrel aswell as a 1.5" steel union, then you put in a burst disk and crank it up to 500psi
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Unread postAuthor: Hubb » Sun Aug 10, 2008 2:30 pm

Spring loaded ball valve? Homemade piston valve?
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Unread postAuthor: [insert name] » Sun Aug 10, 2008 4:25 pm

i was planning on using around 200 psi but the max i would use is 900 is that over kill? also would steel pipe hold that much pressure?
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Unread postAuthor: SpudFarm » Sun Aug 10, 2008 4:28 pm

2" steel would have an absolute max of 500psi on constant pressure.

that is my opinion.
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Unread postAuthor: DYI » Sun Aug 10, 2008 4:45 pm

If the steel is SCH 40 seamless or higher, 900psi is fine. With SCH 40 welded, it should hold, but I wouldn't want to be standing beside it.
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Unread postAuthor: SpudFarm » Sun Aug 10, 2008 4:53 pm

don't listen to DYI he is insane :lol:
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Unread postAuthor: [insert name] » Sun Aug 10, 2008 4:58 pm

okay so steel pipe is fine for high pressure as long as it is sch 40?

Also will 900 psi be over kill i wouldn't think so but i would like to know?
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Unread postAuthor: DYI » Sun Aug 10, 2008 5:15 pm

okay so steel pipe is fine for high pressure as long as it is sch 40?

Also will 900 psi be over kill i wouldn't think so but i would like to know?


SCH 40 is fine as long as it is seamless. Otherwise, it's a risk. SCH 80 or higher is nice if you can get it, because SCH 40 seamless is very uncommon. Anything less than SCH 40 welded is stupid and extremely dangerous at 900 psi.

And a general rule about overkill in launchers: it doesn't exist.
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Unread postAuthor: SpudFarm » Sun Aug 10, 2008 5:17 pm

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Unread postAuthor: [insert name] » Mon Aug 11, 2008 12:17 pm

one more question how would we get the air from the air tank to teh ari chamber we were planning on running the air tank to a reg and then into the air chamber on the canon. ho would we get the air into the chamber with no leaks at around 500 +- psi
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Unread postAuthor: frankrede » Mon Aug 11, 2008 12:27 pm

[insert name] wrote:one more question how would we get the air from the air tank to teh ari chamber we were planning on running the air tank to a reg and then into the air chamber on the canon. ho would we get the air into the chamber with no leaks at around 500 +- psi
MAGIC!
I think you should spend sometime browsing the site and look at some pneumatic cannons for some inspiration
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