Originally Posted By: paul
I think that something so earth shattering should be done properly , with proper documentation , thats why.

Better to start half-assed then move up, than to have grand plans that never get finished because of too many details.

But yea if the balloon thing worked there'd be a possible excuse that the changing shape somehow pushed the external air around, propelling it. So it can show you're wrong but not right. The rigid tanks can clearly show right or wrong.

of course I could just make a tank out of 12 inch PVC pipe that would hold 420 psi because its minimum bursting pressure is 420 psi.

Be careful, that might explode. If the pipe's designed only for liquids, then it won't have the same safety features (like perhaps leak-before-break) as compressed air parts. Also an OSHA violation.