Quote:
Originally Posted by Ryland
Where do you get the kind of air pressure to recharge your air powered car and where do you get the energy to run it?
Alot of compressed gas's that are sold are not pumped as much as they are frozen to compress them.
Also things like small propane tanks are one time use only because they are so light weight that you are not allowed to transport them, it's a DOT rule not a propane rule, that is why you can get home refill kits for filling them off larger heavy tanks but you will never find a store that will refill your small hand held tank.
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Where I used to work we had a cascade air system for our 2250 psi tanks. It was 220V and took several hours to charge the whole cascade (a series of large tanks that could be used in succession to fill smaller tanks to a high pressure). The system cost about $10,000.
Propane tanks are very low pressure in comparison. You just need enough pressure on the propane for it to change state into a liquid (about 150 psi @ 90F).