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Still confused on chamber size

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: noname » Tue Oct 02, 2007 8:29 pm

I think a smaller chamber with higher pressure would yield better performance, simply because the air would dump faster. You could use a 1/2" x 10 foot chamber, or you could use a 3" chamber x 1 foot long, and with the same volume of air, a 3" chamber would be much better because the air wouldn't need to come from all the way at the back of the 1/2" stick.
That's just how I look at it though.
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Unread postAuthor: Mitchza89 » Tue Oct 02, 2007 9:05 pm

Yeah I agree on that one but GGDT says that a bigger chamber size with a bit less psi gives the same power if not more.

Oh yeah, I'm making a poly bb pistol for my mate, gonna sell it for 50 :P
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 03, 2007 8:54 pm

Ok, here's my imaginary launcher, and the results I got when I played with the variables:

20 inch chamber at 50 psi - 406 feet per second

10 inch chamber at 100 psi - 537 feet per second

5 inch chamber at 200 psi - 684 feet per second

2.5 inch chamber at 400 psi - 830 feet per second

1.25 inch chamber at 800 psi - 958 feet per second

0.625 inch chamber at 1600 psi - 1006 feet per second

All the time, we're talking about the same quantity of air, because we're doubling the pressure but halving the volume.
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Unread postAuthor: Marco321 » Wed Oct 03, 2007 9:01 pm

jackssmirkingrevenge wrote:Ok, here's my imaginary launcher, and the results I got when I played with the variables:

20 inch chamber at 50 psi - 406 feet per second

10 inch chamber at 100 psi - 537 feet per second

5 inch chamber at 200 psi - 684 feet per second

2.5 inch chamber at 400 psi - 830 feet per second

1.25 inch chamber at 800 psi - 958 feet per second

0.625 inch chamber at 1600 psi - 1006 feet per second

All the time, we're talking about the same quantity of air, because we're doubling the pressure but halving the volume.


Thanks for that Jack
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