andrew phillips
Well Known Member
I have been flying for several months and I still don't have a good understanding on why to configure the engine one way vs. another. I can control manifold pressure (throttle), RPM (prop) and mixture. For example, why would I choose to run 21" at 2500RPM over 24" at 2300RPM or 25 squared? What determines if you run over or under square? I would love to hear some rules of thumb for setting these parameters for various flight configurations if there are any. It seems to me that for any given RPM I can run a wide variety of manifold pressures, which one is right?