http://www.antonov-clubsite.nl/000000962f000d411/00000098800138a0e/index.html
The gearbox for supercharger function automatically increases compressor
speed up to a predefined pulley RPM . Above that it shifts down. The
function is to have high boost pressure at low engine RPM, generating
more torque but without having too much at higer RPM.
Randolph Toom
Managing Director
heat2power SARL
AFAIK, this was used in some WWII planes, possibly German ones. It was
either a geared auto trans type thing, or a hydrostatic drive.
-Chris
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