Dear Steve,
the big German aircraft engines of WW2 had mechanical driven super-
chargers. Those were centrifugal fans like in todays turbochargers,
but they were not driven by a little exhaust turbine, they were
driven mecanically by sprocket wheels from the crankshaft.
In the drive train of the mechanical supercharger there was a small
two speed gearbox. The pilot had a little switch for 1st or 2nd gear
of the supercharger.
So they could get good charging pessure at low engine revs in the
first gear and use the second gear to avoid too high revs of the
supercharger when the engine reved high.
The BMW engine of the Focke-Wulf FW 190 had a mechanical governor,
called the "Kommandogeraet" which did all this for the pilot, like
a modern electronic motor management.
Regards
Andreas
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