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Jun 28, 2021 at 23:20 comment added Kenn Sebesta Got it. I think the difference is my answer gives "absolute best", with the caveat that you shouldn't expect your engine to live long-- perhaps not even to target altitude-- if you treated it this way. I think your answer is "practical best", which I tend to follow IRL, cruising a 7ECA at 40-50% power.
Jun 28, 2021 at 22:41 comment added John K Yes but when you reduce to climb power you can start leaning, plus the carb or injection system may have a high power fuel schedule or circuit because fuel is providing a lot of the cooling at TO power. It's also to go easy on the engine. Temps and pressures are maxed out, and it's always better to reduce them. It's the main reason for flex thrust in jets; to extend engine life. That old saw about engines liking being run hard is nonsense. No mechanical system last longer when run hard than when run not so hard, as long as it gets regular exercise I cruise my own airplane at 45-50% power.
Jun 28, 2021 at 21:43 comment added Kenn Sebesta Could you go into a little more detail? Your approach seems to directly contradict my approach, but perhaps I'm misunderstanding. For instance, if you throttle back, then you are constricting the intake airflow and induction losses are a major source of inefficiency in engines.
Jun 28, 2021 at 17:33 history answered John K CC BY-SA 4.0