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Old 04-06-2019, 04:49 PM
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RV10inOz RV10inOz is offline
 
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,246
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Dan,

We can agree on what you posted, that is not in dispute at all.

However, climbing to altitude, at reduced rpm (power) if you wish to have climb time as a constant, involves higher angle of attack and lower airspeed.

Yes the peak pressure reduces with lowering MAP (except in a turbo of course), but it is always going to be higher for all given altitudes, so you subject the engine to higher forces for longer all the while having less cooling air.

At the end of the day the effects are subtle and not of significant margin, but when you get your cooling together (as you so eloquently do and advise) you are better off using 2700 and getting to TOC sooner and with more cooling airflow.
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