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9 Foot Long Pneumatic Cannon

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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9 Foot Long Pneumatic Cannon

Unread postAuthor: msg72391 » Tue Apr 18, 2006 6:18 pm

This is my second pneumatic cannon. It has a ball valve trigger system. The expansion chamber is 4' long and 4'' in diameter. I fill it with a schraeder valve. There are two inter changeable barrels, they are both 4' long and one is 2'' in diameter and the other is 1.5''. I typically shoot at 65 psi but my cannon is capable of higher pressures
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Attachments
IMGA0013.JPG
Laying down
IMGA0014.JPG
Frontal view of 3/4" plywood after a hit from a duct tape wrapped golf ball at 65 psi
IMGA0015.JPG
Rear view of 3/4" plywood after a hit from a duct tape wrapped golf ball at 65 psi
IMGA0016.JPG
Profile of 3/4'' plywood
IMGA0017.JPG
Up against the tree
IMGA0012.JPG
Ready for battle!!!
IMGA0023.JPG
Hanging up
IMGA0024.JPG
At 65 psi a duct tape wrapped golfball went through two layers of 1/2 inch plywood! (front view)
IMGA0025.JPG
At 65 psi a duct tape wrapped golfball went through two layers of 1/2 inch plywood! (side view)
Last edited by msg72391 on Wed Apr 19, 2006 5:22 pm, edited 1 time in total.

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Unread postAuthor: zvallance1 » Tue Apr 18, 2006 6:35 pm

well nice gun! love the black paint =)
couple things though:
1. What's the purpose of the Wye you have near the valve...do you use it as a shoulder rest or something? or is it there "just cause"
2. You might want to fashion a spring or small pnuematic ram to your ball valve, to lower the opening time, or better yet go with a sprinkler valve!.
3. doesnt look like you have the best spot to shoot from, from your backyard (or where ever this picture was taken) so be careful where you point that beast!
4.you said you're using golf balls, as ammo...you might want to check out pimpmann's signature, or some hardware store and pick up some SDR-21 1.5" pvc..its a perfect fit for golf balls.

On that note, with the right barrel, and the sprinkler valve, i can shoot golf balls through a 2x4 easily with one of my cannons thats not too much larger than yours 8) (just thought i'd give an example of how great a couple little upgrades can make a cannon!)

anyways, great cannon, and happy spudding!
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Last edited by zvallance1 on Tue Apr 18, 2006 6:43 pm, edited 1 time in total.

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Unread postAuthor: saladtossser » Tue Apr 18, 2006 6:41 pm

BOOYA
simple and powerful, me like, me like
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Unread postAuthor: CS » Tue Apr 18, 2006 7:09 pm

Nice Gun.

Your chamber is a overkill, but I guess it doesnt hurt anything. Check your local pipe stores for SDR 21 and if you cannot get it, you can buy from me. GB's are defintly the way to go for power, by the way nice destruction pic. By covering the dimples your loosing performance. You can get 400% better performance with a un-wrapped ball. Proably even more considering the duct tape creates drag by its self. By all means a duct tape wrapped GB is more destructive then a potato.
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Unread postAuthor: beebs111 » Tue Apr 18, 2006 7:32 pm

istnt that wye nsf-dwv? just wondering, cause it looks it.
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Unread postAuthor: Atlantis » Tue Apr 18, 2006 7:34 pm

Absolutely Massive! Your probably gonna scare the crap out of your neighbors. I applaud you.
P.S. How much does that thing way?
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Unread postAuthor: msg72391 » Tue Apr 18, 2006 8:35 pm

I would say it wieghs in anywhere from 20-30, but that is just a guess. It is not to hard to handle considering that you shoulder it.
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Unread postAuthor: Orbit » Tue Apr 18, 2006 9:24 pm

Looks like that wye is dwv, but what do I know.
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Unread postAuthor: GhostMonkey » Tue Apr 18, 2006 10:52 pm

that's huge ... like a freaking basooka or something ...
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Unread postAuthor: msg72391 » Wed Apr 19, 2006 9:26 am

What is nsf-dwv?
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Unread postAuthor: beebs111 » Wed Apr 19, 2006 9:31 am

it means it is not pressure rated unlike nsf-pw which is, my personal tests show that some dwv parts are safe up to 80 psi but most people reccomend 50-60 as do i if you havent pressure tested them
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Unread postAuthor: msg72391 » Wed Apr 19, 2006 10:39 am

i have used it up to 65 psi multiple times with no problems, should that be my maximum, or would it be safe to hit 75 psi? Also i do not know if it is nsf-dwv, if there is a way to check i would like to know.
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Unread postAuthor: )DEMON( » Wed Apr 19, 2006 10:44 am

would nsf-dwv go that high in the first place?
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Unread postAuthor: msg72391 » Wed Apr 19, 2006 10:47 am

Well I know it goes up to 65 psi so if nsw-dwv cannot go that high i guess i am not using nsw-dwv.
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Unread postAuthor: beebs111 » Wed Apr 19, 2006 2:10 pm

i have taken nsf-dwv to 80 psi without issues but its isnt rated for anything so it isnt gaurentueed. it should have pvcI or nsf-dwv if it is infact. otherwise is would have nsf-pw printed on it.
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