I just used the stock psi of 90.

LOL. Or just get a paintball gun. On another note, I can't get the freaking braided hose anywhere with the correct size fittings to make the propane pipe. AND I can't find the gauge with the regulator on it either. No HD or Lowe's love. I'll try the plumbing supply joint tomorrow.

True. I guess. Why not just buy a paintball gun? I think I'm interested in this hobby because of the possibility of creating something cool. And cool and ugly don't mix for me. Galvanized pipe is just plain ugly. Uglier than PVC to be certain.

Also found another bottle for you pneumatic fanatics. It's called a goodlife bottle. It is a double walled stainless steel bottle and the threads are on the outside of the mouth. Can be found at http://www.goodlifebottles.com o think.

kjjohn wrote:Just get 1/4" valves and gauge.

so I re-looked at the setup. It's doable but the valves will be almost butted to one another.

So here is a question. I did some calculations based on burnt latke's propane pipe calculator. It seems that for such a small volume chamber I will only need a 1/4X2.27 inch pipe. Question is,how in the world am I going to be able to fit the pressure gauge and the two valves into that small of a spa...

If only my sigg bottle had a valve stem.

So, a quality control guy from Rexam said the tops of the soda cans are rated for 90 psi. So the weakest part of a soda can is rated for 90 psi. I think the Sigg bottle is safe for a combustion cannon.

I'm not sure why you're so into this about psi and disharging pneumatic cannons. I believe that reading comprehension has dealt a devestatinv blow tou your dome. Nobody but you is talking about this for pneumatic purposes. Like I said, if the bottle fails before the 1/2 piece of frozen carrot is for...

Awesome. "liquids don't compress." so what about the gases inside the beer can? Does it not count in "I'm always right" world? Relax. I'm not using the thing under constant pressure. Still. And since when does a pressure rating not count just because it is a soda can or beer can? If the soda can is ...

I think we should reserve judgement on pressure ratings until it's been tested. Like I said before, a shaken soda (12 oz can) can produce 100 psi at temps above 90. There is no way in heck that this bottle can't withstand pressures from a hot shaken soda. Their website clearly states that soda is sa...

Slow down turbo. You telling me there is a PVC manufacturer that suggests exploding gas inside their products? Or a propane tank manufacturer that makes products specifically made to launch projectiles from makeshift cannons? Dont be silly. And no. I never hammered a hose adapter into a water bottle...

There isn't a "right fitting". It's a drink bottle, not a pressure vessel. It's not designed to be compatible with airlines or pressure water systems. It wasn't made with the intention f holding pressure. To think that the fitting is the right one and they are a perfect pressure vessel is the wrong...

Sorry to hear about your knee. I wouldn't blame the bottle for you having chosen the wrong fitting though. The thin-ness or softness of the aluminum has nothing to do with the fitting breaking loose. You just need a fitting that, well... Fits. This one is a 3/4" hose fitting and it fits like a champ...

I guess without having onevtested we can do only a couple things: try it, test it or guess based on other things' pressure ratings. For instance, a typical coke can at rest has an internal pressure of 50 to 55 psi. I've read that the pressure increases greatly when the can is shaken. So I'd guess th...