Lean of Peak (LOP) Engine Operation Explained





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Published on Jan 22, 2018

Lean of Peak (LOP) - it's the holy grail of engine operation for some, and pure evil for others. You are not sure who is right? This video shows what really happens when we fly lean of peak, how it is different from rich of peak (ROP), and how at different times either LOP or ROP can be the right choice.

Join me on a flight where we collect and compare data from running the engine first ROP and then LOP. We'll explore how rich or lean mixtures influence exhaust gas temperature (EGT) and cylinder head temperature (CHT), and of course fuel economy (and thus the range of your airplane). We'll also discuss the "red box", which is an area in which the engine should not be operated in, and why it is difficult or even impossible for some engines to run lean of peak well.

While great care has been taken to ensure the information presented in this video is accurate, different airplanes and different engines may require some practical adaptation to get the most benefit out of LOP and to prevent harm to the engine. Therefore, rely on this video for the background, but team up with a flight instructor familiar with lean of peak operations in your type of airplane and with your type of engine to apply what you learn here.

A couple of URLs from this video:

John Deakin's "Pelican's Perch" article index:

Advanced Pilot Seminars:


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