wrote:
It IS simple. You are not getting 100% horsepower at takeoff. You
are inventing the need for the constant speed prop. Great example
is the 180hp Tiger with a cruise prop!

Now, I want to learn something from this...

Why is it that maximum static RPM is independent of altitude?

Horsepower drops with altitude. But static RPM does not. Horsepower
is related to the cube of RPM for a fixed pitch prop IIRC. Why is it
that static RPM stays constant?

Good thing, actually, or a fixed pitch prop would be practically
useless.

Bill Hale



For a given engine, the drop in static HP with altitude corresponds to
the drop in air density (and therefore air resistance) with altitude.

Air Density affects both factors equally.