help with C:B ratios.

[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.

[SpudBlaster15]

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[A-98]

is that crazy big for a pneumatic?( at ~100 psi)

i dont want this thing to wake up the neighborhood

[SpudBlaster15]

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[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.

[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?

[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.

[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