Page 1 of 1
help with C:B ratios.
Posted: Mon Mar 12, 2007 12:38 am
by A-98
ok, first off, im good at math, but im terrible with ratios, so could omeone help me?
i have a chamber with a volume of 301 cubic inches, and a barrel with 63 cubic inches.
i sorta did the math and i came out with .79:1....but i know thats terribly wrong.
any help would be appreciated.
Posted: Mon Mar 12, 2007 12:41 am
by SpudBlaster15
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.
Posted: Mon Mar 12, 2007 12:48 am
by A-98
is that crazy big for a pneumatic?( at ~100 psi)
i dont want this thing to wake up the neighborhood
Posted: Mon Mar 12, 2007 1:25 am
by SpudBlaster15
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.
Posted: Mon Mar 12, 2007 7:20 am
by joannaardway
Huge C:B ratios are usually best avoided, unless you're trying to break the sound barrier, or make a racket. If you can, halve your chamber size.
Posted: Mon Mar 12, 2007 10:07 am
by A-98
ill think about changing the pipe size from 4" to 3", and also chaning the length from 24" to 18". ill plug in the #'s and see what i get.
thanks for all your help!
EDIT: ok, i plugged in the #'s and i got a C:B ratio of 2.01:1
could someone check that for me?
Posted: Mon Mar 12, 2007 5:40 pm
by noname
Or you can just make the barrel longer.
Better performance, but reducing chamber size and increasing barrel length will make it possible to have a chamber still big, but not as big, and you can still come out with a 1.5:1 or 2:1 ratio.
Posted: Mon Mar 12, 2007 8:57 pm
by A-98
well, im not sure if pimp has cut the pipe, but im going for a 3' golfball barrel, And the max length shippable is 5'...ide have to do the math....i might do some optimization. also i have the price figured out so that it comes to 80$, and i dont want to mess that sexy # up