POHs list takeoff distance for various pressure altitudes. But the higher the altitude the less performance/power a normally aspirated engine produces. POH says to lean for best power. Best power will be lower RPM at higher pressure altitudes so are the figures in the POH are assuming what RPM? Example: sea level normal max RPM is 3000 RPM, what should RPM be at 8000 pressure altitude for best power?
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