Thats different!!!, would I be right in saying that this is a form of steam engine, except the air is cold. If there is a compressor built in that worked on over-run it would probably keep it charged quite well, and if you had them lightweight solar panels then they could be running a compressor as well. So in theory in Australia or indeed any local where the sun is prevelant this would work very well.
In a worse case scenario you could have a hand or foot pump device for charging the tank.
Sounded a bit noisey but it just shows that with todays technology we can revisit concepts that were impossible not that long ago. And for buzzing about city centres like taxis etc then I think it has real potential.
Look at places like rome where on certain days they have to ban traffic because of excessive levels of exhaust gases, think of the difference that this would make.
However the electric tram systems is also a great way of helping cut down town polution, but combined with air, yes.
Wonder who gets there first air or fusion.
