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I was lucky enough to handle a disassembled motor and what you call the freewheel. Here is the proper name I learned. Http://www.ina.de/content.ina.de/en/products_services/rotativ_products/drawn_cup_roller_clutches/drawncuprollerclutches.jsp
And video explaining how they work here. The Bosch...
The article says 'revolution ratio of 2.6' for pedal / crank ratio. I've measured this at 2.5 though. (1: 1) Put the pedal at 12 o'clock and valve on the rear wheel at 6 o'clock and rotate the pedal 360 degrees and the back wheel turns 2.5 times.