Coaxil Design

[octane89]

Well I really like how easy it is to make them- I want people to say damn when Im finished. Imagine something like that but just with bigger pvc pieces. More like a Compact Bazooka or something.

[spudgunnerwryyyyy]

Piston valves in tees are simple too. They work off the same principal and require just a little bit more work to get working.

[octane89]

Ive considered both options, I think these are much "cleaner" though.

[jimmy101]

my math might be bad, but wouldn't a single chamber of 3" pvc hold more than two chambers of 2"?
area of 2" circle = 9.8-10.0-ish
area of 3" circle = 22-ish

i'm too lazy to break out a calculator

Yep, your math is bad.

area of a 2" diamter circle is 3-ish square inches not 10-ish.
area of a 3" diamter circle is 7-ish square inches not 22-ish.

Area = Pi*r², not Pi*d²

But, if you want the ratio of the two, then it doesn't matter if you use the radius or the diameter. So your conclusion was correct but you got there the wrong way.

[jackssmirkingrevenge]

my math might be bad, but wouldn't a single chamber of 3" pvc hold more than two chambers of 2"?

Around 12% more air for the 3" chamber.