I have searched other threads and haven't found any discussion: can anyone explain why for a set MP/RPM range decreases with altitude, until reaching I presume full throttle height, then increases again only to regain the same sort of range at quite high altitudes (mid-teens). Normally aspirated only.
The following, if I am lucky, is a chart of a Baron 58 to better describe what I am talking about
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I assume the actual horsepower delivered INCREASES if you hold the same MP/RPM with ascent, along with increasing fuel flow and increasing TAS. In summary, the most efficient altitude to fly negating wind seems to be SL.. I always thought to go maximum range get up nice and high 7-8000ft have a decent TAS on the same fuel burn as a lower TAS down low. This chart proves me wrong.