Quote:
Originally Posted by WTE_Galway
Cruise by definition is the range of power settings that provide the best level flight fuel efficiency. That is what all pilots mean by cruise - fuel efficient flight.
Whilst you may be able to use climb power to sustain high speed level flight there is no way climb power is a "cruise" condition, that is just stupid. Its important to get definitions right or these threads devolve into pointless arguments about exactly what a term actually means.
Maybe you are permitted to use climb power for sustained high speed flight, but calling that "cruise" just confuses the issue.
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You are correct. I don't know why Crumpp came up with "climb rating for cruising" as no would call it "cruising" when you apply "climb rating". I only wanted to show that "climb rating" is not deemed to a flight conditions where rate of climb is > 0.
About "cruising" definition. In RAF terminology there are 2 "cruising" or "continuous" ratings. The higher one ("rich continuous") is the maximum power that can be obtained without time limit and if the engine runs at this setting it will have a reasonable life time of 100 hours. Everything setting above that shortens the engine life at a higher rate. Everything below that setting will lengthen the engine life.
The lower one ("weak continuous") is for the limit for the use of mixture control at "auto weak". This is a simplified guideline for best fuel efficiency, however there are many factors the influence best fuel efficiency. More details about how to obtain best fuel efficiency are typically given in the Pilot's Notes of each aircraft.