On an airplane with a constant speed prop, the prop lever typically controls the RPM (pitch) of prop, and the throttle controls the power, measured as Manifold Pressure ("MP"). However, at low power settings with the prop lever full forward, there is a point where the throttle control begins to act like a throttle on a constant pitch airplane where the throttle controls the RPM. This is the point that I'm asking about.
Does this point occur at the same MP on all aircraft? Conceptually I understand that when the prop is set to max RPM the prop will adjust pitch finer and finer as I reduce power until it gets to the point where it can't flatten out the pitch anymore as I continue to reduce power, then the RPM will begin to drop. Is this a point that is specific to engine/prop combination or is it adjusted by mechanic?