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Shot Results! First Air Cannon./any ideas on how to improve?

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Shot Results! First Air Cannon./any ideas on how to improve?

Unread postAuthor: Matt221985 » Mon Jun 04, 2007 11:30 pm

This is my first air cannon.

Air tank-3inch pvc 2 ft long
Barrel-1 1/2 inch pvc 5ft long\
Still need to add ball valve and im already to go...Updates once its finished. Any ideas are welcome..


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Last edited by Matt221985 on Wed Jun 06, 2007 11:36 am, edited 4 times in total.

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Unread postAuthor: hi » Mon Jun 04, 2007 11:40 pm

welcome to the fourms. i hate to say this, but you used DWV. you need to get pressure rated fittings. other than that it looks excellent.

your fittings need to say (nsf-pw) right now they say (nsf-dwv) just change that before you glue it and it will be perfect. if you did glue it then dont take it above 60 psi or so.

i would also like to suggest a barrel support. it might get a little wobly with out it. again, i looks great, just get new fittings.

edit- another thing you may or may not want is a compression union, that way you can screw tha barrel on and off and have it as a breech loader.
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Last edited by hi on Mon Jun 04, 2007 11:42 pm, edited 1 time in total.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Matt221985 » Mon Jun 04, 2007 11:42 pm

what fittings should i replace? on what end? they were marked PVC
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Unread postAuthor: hi » Mon Jun 04, 2007 11:44 pm

i know that they are pvc, it just a low grade pvc thats all. the two elbows and the reducer need replacing. they will say nsf-pw on them.

you dont have to change them, but for safty reasons i would. you can take it to much higher pressures if you do get new ones, thats all.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Matt221985 » Mon Jun 04, 2007 11:47 pm

well, prob too late now, all glued together, except the barrel

was looking to get up to 90 psi out of it
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Last edited by Matt221985 on Mon Jun 04, 2007 11:49 pm, edited 1 time in total.

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Unread postAuthor: noname » Mon Jun 04, 2007 11:49 pm

It's never too late to be safe with something. Cut the DWV fittings off and get pressure ratings, you'll be happy you did later.
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Unread postAuthor: Matt221985 » Mon Jun 04, 2007 11:50 pm

ok, so what would go wrong with these fittings if i use whats on it now?
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Unread postAuthor: hi » Mon Jun 04, 2007 11:53 pm

it really worth it. you built a great cannon, you gust have a few bad parts. thats all. this is what happens at around 90 psi.


[youtube]http://www.youtube.com/watch?v=AQo81nqx-W8&NR=1 [/youtube]
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Last edited by hi on Mon Jun 04, 2007 11:54 pm, edited 1 time in total.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: noname » Mon Jun 04, 2007 11:54 pm

They have a very short socket depth, and will blow off eventually. The way this cannon is built, you'll be hit by a pound or so of very fast moving plastic pipe fittings. You can use them, but don't take it over 50 psi.
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Unread postAuthor: Matt221985 » Mon Jun 04, 2007 11:57 pm

ouch! what blew up in that video? cant really tell
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Unread postAuthor: hi » Tue Jun 05, 2007 12:02 am

a reducer.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 12:07 am

ok, so where can i get high pressured pvc fittings? bought mine at home depot, dont know if they have high pressure fittings, should i replace the 3 inch one too thats on the tank?
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Unread postAuthor: hi » Tue Jun 05, 2007 12:46 am

the end cap is fine where it is, you just need a new reducer ( it looks like you need two accually) and the two elbows. i didnt know that home depot had 3'' pvc pipe. they should have it there if they have the pipe, but if not then a plumming store will have it. you need a bushing, not a bell reducer. if it looks like a bell then it is probably dwv, but if it is a bushing then it is nsf-pw.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: MrCrowley » Tue Jun 05, 2007 12:58 am

Is the chamber even Pressure rated?

So far you need to replace:

Reducer x 2
Elbow x 2

and any other non-rated pipe we can't see.
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Unread postAuthor: Matt221985 » Tue Jun 05, 2007 1:04 am

yes, the chamber is rated for 350 psi and the barrel is rated for 120 psi, i washed off all the lettering so thats why u cant see it...

As "hi" was saying i shouldnt go over 60 psi becuz of my fittings, if i were to use it at 60psi with the fittings already on there..how much power would i get from 60 psi out of a cannon this size? enough to throw a spud 200 yards or so?
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