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Originally Posted by MiG-3U
Hm... using the same standars there is no real test data supporting 109E doing 500kmh at sea level.
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Of course there it is.
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Only a calculation based on a prototype aircraft with a non-standard two speed supercharger and a power value which is higher than normal 601 power.
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I call BS on this. Got any sources for these claims?
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However, there is several test data sets supporting speeds around 470kmh for 1.3ata and supposedly faster 109F is doing just 495kmh at same power according to kenblat.
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I would like to see them. Hopefully, they are just as detailed as the flight tests and official specs you are dismissing. That includes calibration curves for the pitot, boost and speed measured at various altitudes and known conditions, and proof check of the engine at a bench.