Air Motors

• This one says 70% efficient - really? [1]
• CFM of 20 gets 0.5 hp about. 1 cu m is 35 cf. 1 cu m at 190 atm is 7000 cf, at 20 cfm gives 350 minutes or almost 6 hours.
• 7 cfm, 0.2 hp - $250 - [2].
• 14 cfm gets me the right power - 0.4 hp or 300W.

Power Out

• 1 cubic meter of air storage - at 200atm - gets you 7000 cfm at stp. Since we need to save 10 atm to run, have 190 atm available - so 5% negligible loss - most is usable air. This is 500 minutes of air - 8 hours - of 300W - or 2.4kW hrs! This is just plain adiabatic.
• Thus, having access to 1 cu m of stored air - is key - for an inefficient storage system.
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