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Old 11-01-2012, 11:43 AM   #13
Studly Adventurer
Joined: Oct 2004
Location: Merced, CA
Oddometer: 808
it's inefficient, but it's also lightweight as far as energy storage goes.

being lighter means you need less of the stored energy to transport the storage method's own mass, so the system efficiency is not lower to the same degree that the energy recovery factor is lower.

Also, pneumatics are simple to manufacture and inexpensive, and don't use much in the way of exotic materials.

I'm sure there are some applications where this type of thing makes sense.
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