I see the CockpitInstrumente site has gone to paid membership for his books, not really surprising, have seen a lot of his stuff popping up on ebay and such :(
I You will find the the DB engines used a setup very similar to a Torque Converter/hydraulic linkage for the compressor linkage, thus giving an Infinite number of solutions to the speed ratio ?
if you look on the German Cockpit Instruments page, you can find a very nice technical manual for the...