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Why Won't My Piston Cannon Work?

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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Unread postAuthor: watto » Sat Oct 20, 2007 6:02 am

MrCrowley wrote:
watto wrote:I got a 1/4inch ball valve, like one person recommended, I can always upgrade to a bigger one in the future though. The gun is working now but lacks power, but I think filling up the hollow plug should help a lot.


I doubt it will be much, I usually fiddle around with pilot volume measurements on GGDT and an increase of 100cm^3 gives no change in velocity most of the time for my SGA gun(depending on cannon).

I had a 3/8" ball valve on it once, which has a QC on the end, I could only get about 200m with a golfball, now I get 400 with a 1/2" ball valve, which is now upgraded to a 1" sprinkler.

I strongly recommend a 1/2" ball valve, it'd do a lot more then filling the plug, and it will save air, which saves pressure and gives more power.


Ok, I'll go swap the 1/4in for a 1/2 tomorrow.
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Unread postAuthor: watto » Sun Oct 21, 2007 3:31 am

I just got a nice big pvc ball valve the opening is 15mm, so more than 1/2 an inch. :lol:
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Unread postAuthor: MaxuS » Sun Oct 21, 2007 3:54 am

15mm threads on a ballvalve coincide exactly with 1/2" BSP threads.
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Unread postAuthor: MrCrowley » Sun Oct 21, 2007 4:00 am

American fittings(NPT) work finewith British fittings(BSP), even if they're arn't threaded fittings.
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Unread postAuthor: watto » Sun Oct 21, 2007 6:21 am

It's a glue-in ballvalve with no threads so I got a 15mm glue-in thread to screw into the plug
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Unread postAuthor: battlemonkey » Sun Oct 21, 2007 2:07 pm

Never seen one of those before
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