Stuart.......
The compressor is a British made SIP Industrial.
http://www.alexander-mills.co.uk/sip/compressors/compressors.htm
The motor is a 3 phase 5.5 HP running a 2-Stage, 2 cylinder compressor that will fill the 52 gallon tank within a minute of starting up.(Just worked out it is a 52 NOT 40 gallon tank!)
Running a pressure sand blaster the unit can go a few minutes without cutting in, and that is running at 100 psi.
The specs on the unit are 25CFM.....free air delivery.
The 3 Phase 415 Volt power supply we have in Australia is a big difference to running a 5 HP single phase 110 Volt motor there in the states.

That combined with the 2-Cyl, 2 Stage pump, moves and compresses the air much more efficiently than your normal air compressors.....hence the much bigger output.
Just more efficient from the same amount of horsepower.

Last edited by doc bob; 11/24/2009 5:37 AM.

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