Paul Lamar wrote:

An aircraft engine is not like a car. The RPM range is less than
a 1000. Static to max speed.

For a traditional aviation engine this is true.  For a PSRU-equipped
engine, this may be less true.  1000 RPM (engine) on a 2.85:1 PSRU is
350 RPM (prop).  So 2,200 to 2,550.  That's a *big* part of the normal
operating range of normal aviation props, but that isn't *all* of it.
I'd think that 1,500 is a more reliable approximation, but the gist of
your argument is still sound.

Russell Kent

I run my C182 engine from 2000 RPM to 2400 red line. A 2.85:1 PSRU = 1140 RPM range.
Rarely do I run it below 2000 RPM and that is wth a constant speed
prop. Fixed pitch props with AC engines are less than that.

Paul Lamar
 
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