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So basically the French obtained 494 kph at 600m with 2400 rpm and 1.346 ata.
Extrapolating pessimistically to 0m they would have obtained 478 kph at 0m with 2400 rpm and 1.332 ata.
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READ the report!! (You are not the only one either, I did not pay attention to some details either)
The limitations of their own instrument measurements:
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Due to that, there is an uncertainity about the results. This uncertainty is about 2 to 3%. Thus maximum speed is 570km/h +/-15km/h.
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The data is not converted standard conditions.
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Nevertheless, during the level flight testing done under 5000 meters (external temperature = +6°C on ground
and -17°C at 5000 m.)
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If you do convert it to standard conditions then the French conclusion is correct:
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In general, the first tests made at the Center concerning the
Messerschmidt 109 appear to confirm the performances claimed by the
Germans.
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http://kurfurst.org/Performance_test...formanceT.html