Why Won't My Piston Cannon Work?

[watto]

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.

[watto]

I just got a nice big pvc ball valve the opening is 15mm, so more than 1/2 an inch.

[MaxuS]

15mm threads on a ballvalve coincide exactly with 1/2" BSP threads.

[MrCrowley]

American fittings(NPT) work finewith British fittings(BSP), even if they're arn't threaded fittings.

[watto]

It's a glue-in ballvalve with no threads so I got a 15mm glue-in thread to screw into the plug

[battlemonkey]

Never seen one of those before