EVguru wrote: It's been discussed on the EV list many times and people who can do the maths have shown that the energy density of compressed air is less than that of good old 'wet' lead acid. The energy efficiency is about half that of lead acid!
I have to admit that I personally cant see how they can be as efficient as something like a battery, shearly down to amount of energy used to compress the air in the first place, BUT one has to think that the engine could be very useful in areas where it wouldnt be practical to use a normal engine or battery vehicle.
Theres also the discussion that if you where able to use free energy to "charge" the air vehicle in the first place then does it matter that its not that efficient, its not like ICE engines are wonderfully efficient
ChrisB