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6-inch combustion chamber

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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6-inch combustion chamber

Unread postAuthor: mpuninske » Mon Oct 30, 2006 2:48 pm

I have built several combustion guns with 3-inch and 4-inch chambers. I would like to build a larger one with a 6x24-inch chamber. Any thoughts?
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Unread postAuthor: Tshylea » Mon Oct 30, 2006 6:08 pm

You would get the same size with a 3x48-inch chamber and 3" stuff is cheaper. Still, it would look pretty cool.
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Unread postAuthor: dippert » Mon Oct 30, 2006 6:14 pm

actually 3x48 has a volume of 340cu inches
6x24 has a volume of 680 cu inches

volume of cylinder = pi * radius^2 * length
pi = 3.14 for those w/o the special button

3"x96" = 6"x24"
last i checked the PSI on 6" sch 40 was only 80, i'd stay w/ 4" or get a metal casing for the chamber in case of catastrophic failure
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Unread postAuthor: SquishY » Tue Oct 31, 2006 6:14 am

It's only a combustion, you don't need pressure rated crap for a combustion unless using injected fuels like propane hence the common use of ABS.
Good job on the math though, the only math class I payed attention to was geometry and now I know why I never told teach when the hell would I use that.
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Unread postAuthor: mpuninske » Tue Oct 31, 2006 8:13 am

So if I use ABS for the chamber 6x24 it would be safer than PVC. What is the ABS rating?
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Unread postAuthor: SpudFarm » Sun Nov 05, 2006 6:19 am

use sch80 pvc 400psi i have read on an other site
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Unread postAuthor: frankrede » Sun Nov 05, 2006 1:44 pm

Why, normal sch 40 would work and abs would work, abs would be ideal so it isn't as heavy.
Abs has no rating but it is fine for comustions.
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