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So basically the French obtained 494 kph at 600m with 2400 rpm and 1.346 ata.
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Where do get that? The French NEVER used the German technical atmosphere.
The French were instrumental in forming the ICAO in 1912 and adopting a standard atmospheric model of that organization, the ISA.
The ISA uses 760mm as 1 ATA.
Once more, the 1.28 corresponds to the 1.3 ata rating. There is NO 1.35ata rating cleared for the DB601A according to any documentation I have seen.