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Posted for Walter Atkinson <walter@advancedpilot.com>:
Because for optimal efficiency, as the power demand changes, you want the
output and power drag from the supercharger to change. At the lower power
settings, you're still having to turn the supercharger at the fixed crank
ratio rpm. So, if you're turning 2400 rpms, the supercharger is still
turning at the ratio that it is geared or belted to turn whether you are at
15" MP or at 29" MP. That is inefficient and undesirable.
Walter
"""
WHY does it need to be variable speed?
Terrence O'Neill
LNC2 IO-320 N211AL
The fundamental problem with superchargers whose speed is a multiple of
the speed of the crank shaft is - -- the speed is a fixed multiple of the
crank shaft when it VERY VERY much needs to be a variable speed, not fixed.
"""
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