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3/4" exhaust valve 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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Unread postAuthor: jackssmirkingrevenge » Sat Feb 23, 2008 4:57 am

I bought myself a heavy duty floor pump today and now that I have a chrony that can be used with projectiles greater than 6mm. thought I'd dust off this project and do some velocity tests. All tests were done at 150psi:

28 gram 3/4" slug - 234 feet per second (53 ft/lbs)

6 gram glass marble - 447 feet per second (41 ft/lbs)

3 gram 12 gauge sabot - 496 feet per second (25 ft/lbs)

Performance figures are a tad lower than I was expecting, it doesn't seem to be performing as it used to. Even with 40 more psi than I was using before, the crack on firing certainly isn't as sharp as I remember it. Perhaps the piston's gummed up inside, but it's all sealed in epoxy now so I guess I'll never know :roll:
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