Im building my first combustion cannon and i got a 2" PVC pipe for my barrel and a 4" pipe for my chamber. I want my barrel to be 48" (4 feet) long and i was wondering what i should have my chamber cut to. I got it cut at 24" right now but i dont know if it should be any shorter. any suggestions?

I ...

ive been going to a dollar store and alot of the sprays and stuff there have ALOT of flammable parts to them.... havent tried most of them out yet though. Alot of the cheaper aerosols work good.

Man, I LOVE that gun. Im building my first right now, and im lookin at yours and a couple others for ideas...i love minigun style handles and the clear chamber is the coolest thing ive ever seen. I like the lder style of your gun better though, im not a big fan of the fin/leaf thing in the back ...