>> Matt-
    >
    > And to play the green card, how efficient is your compressor, your power
    > lines and your coal fired generators etc. Also a real B if you run out of
    > air and air drives tend to be very noisy.
    >
    > John

    John
    I wondered about that; as well as my compressor only goes to 800 - 1,000
    psi. I wonder how they get the 4,500 psi, bloody BIG compressor I suppose.
    One thing which is a bonus here in Aussie, we don't have to pay for air (at
    the servo) unlike you chaps in the USA. It might cost as much to fill with
    air, using this system it may be you pay for gas in the US. Mind you we pay
    more for the fuel. We have been paying $1.50 ( Aust) a Litre, that's about
    $1.30 US a Litre  There's 3.8 Litres to a US Gallons to so that's $4.94
    a
    gallon.
    Are you anywhere near that yet?
    George (down under)

Smaller compressor more PSI less CFM, larger compressor more CFM less PSI.

Dan

The problem with compressed air systems is one of thermodynamic
inefficiency.  The air is heated during compression, then sitting in the
tank it cools -- that is lost energy/efficiency.  There are compressed air
energy storage systems used for utility power generation, but the compressed
air is used to increase the output of a natural gas fired turbine, so they
can get greater than rated output from it.

Bill Schertz
KIS Cruiser #4045
N343BS