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Posted: Tue Oct 02, 2007 8:29 pm
by noname
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.
Posted: Tue Oct 02, 2007 9:05 pm
by Mitchza89
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
Posted: Wed Oct 03, 2007 8:54 pm
by jackssmirkingrevenge
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.
Posted: Wed Oct 03, 2007 9:01 pm
by Marco321
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