Thanks for that reply Jan. I was simply thinking that catching the air from that pump, and confining it in a metered/gauged way, would provide a standard measure of work load that could be used to compare relative "horsepower" ratings of different engines and gearing systems. I've often thought of building a simple winching system that you could adjust weight/distance vs time of lift, but the pumped pressure capability would perhaps be an even easier system.
Also sorry for derailing your thread down a different track Wayne!