> Not convinced that pneumatics are ideal for mobile robots though, 
> high
> pressure air cylinders are bulky and heavy and not so easy to 
> recharge
> autonomously.  Although...I wonder how energy density compares to 
> decent
> battery technology?

The highest possible gas pressurisation systems are exceeded in energy 
density only by top battery chemistries. Chemical energy density is 
still substantially higher than the best batteries (or fuel cells).


        RM

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