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chamber length (i know this is asked alot)

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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chamber length (i know this is asked alot)

Unread postAuthor: geardog32 » Tue Aug 25, 2009 7:35 pm

i am going to finish my piston cannon tonight and the last thing i have to do is glue on the chamber. my piston valve is built into a two inch T with 1.5 inch porting and i am torn between 20 inches and 30 inches of three inch pipe for my chamber. in your experience what do you think. by the way i will be using a track pump to pump it up.
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Unread postAuthor: MrCrowley » Tue Aug 25, 2009 7:52 pm

Depends how long your barrel is, if it's 5' or under, 20" will be enough. Probably can do with even less.

BTW, goodluck sealing a 2" piston with a track pump and a 3" chamber. If your piston isn't o-ringed, in my experience you'll have great difficulty.
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Unread postAuthor: cannon monkey » Tue Aug 25, 2009 7:55 pm

interesting tell me how that works out go with wat mr crowley said and will getting it to seal pump fast :D
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Unread postAuthor: geardog32 » Tue Aug 25, 2009 8:10 pm

i think i will go 20 inches. as for sealing if i place my hand over the chamber side of the valve and give it a pump it seals right away. but we will see, if it doesn't seal right away i have an idea that doesn't involve o rings that will work for sure.
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Unread postAuthor: MrCrowley » Tue Aug 25, 2009 8:21 pm

geardog32 wrote:i think i will go 20 inches. as for sealing if i place my hand over the chamber side of the valve and give it a pump it seals right away.

That's without a 3"x20" chamber mind you.
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Unread postAuthor: geardog32 » Thu Aug 27, 2009 3:05 pm

it has no trouble sealing. it actually seals in less than a stroke of the track pump. i will post it in the cannon section later maybe even a video.
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Unread postAuthor: covey12 » Fri Aug 28, 2009 1:45 pm

yea my 2" piston had a 4ft. 3" chamber to account for a large barrel, just say that it was a failure unless i was using co2
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