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8 ft long pneumatic spud launcher

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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8 ft long pneumatic spud launcher

Unread postAuthor: msg72391 » Tue Oct 04, 2005 7:39 pm

This spud launcher shoots fast and far but runs on low pressures such as 25 psi. I shot a rubber ball ou of sight into the sky, no exaggeration.
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Attachments
PA040059.GIF
My Huge Spud Launcher
PA040061.JPG
Ball Valve (trigger)
PA040060.JPG
Shraeder Valve (For Filling)
PA040062.JPG
3 inch:2 inch converter to make the gun shoot faster and farther.

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Unread postAuthor: smoch125 » Tue Oct 04, 2005 7:44 pm

this thing is pretty sweet, how long is the three in segment. the 2in??
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Unread postAuthor: msg72391 » Tue Oct 04, 2005 8:02 pm

the 2 in segment is 4 ft long
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Unread postAuthor: drac » Wed Oct 05, 2005 5:40 am

Holy cow, that thing is monstrous. What's the red gunk all eover the fittings? Primer, or epoxy?
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Unread postAuthor: msg72391 » Wed Oct 05, 2005 8:38 am

epoxy is the red,orange gunk that keeps it air tight when it is on the outside, it fills in any gaps.
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Unread postAuthor: msg72391 » Wed Oct 05, 2005 8:43 am

the 3 inch segment is 3 ft long
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Unread postAuthor: PCGUY » Wed Oct 05, 2005 8:50 am

msg there is an edit button so you don't have to double post 8)

You say that's primer and stuff that keeps the cannon air tight? Are you using this becuase you didn't correctelly use primer and cement on the cannon? If so I woulden't get ANYWHERE near that cannon it's just waiting to blow apart.
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Unread postAuthor: msg72391 » Wed Oct 05, 2005 8:57 am

I did use primer and cement properly but just be extra safe i put some epoxy on the outside. Sorry I did not describe my previous post well enough.
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Unread postAuthor: PCGUY » Wed Oct 05, 2005 9:06 am

Oh then your fine, I was worried :wink:
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Unread postAuthor: spudshot » Wed Oct 05, 2005 1:30 pm

looks good, i'd replace the DWV reducer and tee though, and the schrader valve should be tapped thru 2 layers of PVC (where the fitting overlaps the pipe) all in all, good job, next you should try a homemade valve or a sprinkler
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Unread postAuthor: msg72391 » Wed Oct 05, 2005 1:34 pm

thank you for the compliment and suggestions
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Unread postAuthor: msg72391 » Wed Oct 05, 2005 7:58 pm

I just filled the above cannon to forty psi, is 40 psi too much or can I fill this up even more? I don't want my gun to break but if I can crank it up even more it would be unbelievable.
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Unread postAuthor: drac » Wed Oct 05, 2005 8:14 pm

You can get it up to about 80-90 PSI safely. I have a DWV launcehr that I've taken to 130 without problems, but i was stupid to do so.
Stay below 100 PSI.
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Unread postAuthor: msg72391 » Fri Oct 07, 2005 5:41 pm

Thanks that makes me feel better. It is funny because I thought 40psi was too much but if you are right i can take it up too 100psi!!
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