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Ref. article by Geoff Guzynski as On-line extra to Issue 230, he states that in 5 minutes of spraying he will move 1,000kg (a tonne) of air through his spray gun.
That seems an awfully powerful spray gun - at approx 1kg/m^3 air density, that is 200,000L/min ... how does he hold onto the gun?
Now if he was spraying water at a 1,000 time the density, maybe the figures work out, but not with air.
Unless I read Wikipedia wrong as well ...
Regards - John