alt.energy.renewable

"David Williams" wrote in message
news:1207754175.916.1207738851@bayman.org...
>-> No expensive batteries. Look at an air tank as the battery case. The
> -> battery has a expensive stuff inside that wears out out. The air tank
> -> doesn't wear out and cheap to make.
>
> -> Braking gives free compressed air. A battery is an accumulator storing
> -> energy and giving it out. Compressed air can do it cheaper in capital
> cost
> -> and running. A hybrid petro/air car is the answer.
>
> Scuba tanks have to be frequently inspected
> and periodically replaced.
> The metal stretches slightly when the tank is
> pressurized,

They are not using metal for the tanks.