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Originally Posted by Kwiatek
Most know German data for test of serial production 109 E-1/E-3 claimed for 1.3 Ata (5-minutes emergency power) with 1/4 radiator open: 467-475 km/h.
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Unfortunately, no. The papers you have posted clearly state that the results were not adjusted to the nominal engine outputs. They are not performance test but comparison flights with various installations (guns present/not present, slats sealed/unsealed).
And in all likelyhood, they are all done using the high altitude blower (FS gear in English terms) for the trial.
The flight test results. I see a trend here. The three test you have posted we know that they were done at a lower boost setting, with the results not having been corrected to guaranteed engine outputs, and we do not know if, during the tests, they used MS or FS gear.
We do know however that they all match the results obtained in the most detailed test, that was corrected for guaranteed output, and when during the trials the the supercharger in FS gear.
WNr. 1774
485 km/h at 1.31 ata at MS gear (uncorrected for guaranteed engine output)
497 km/h at 1.35 ata at MS gear (corrected for guaranteed engine output)
460 km/h at 1.31 ata at FS gear (uncorrected for guaranteed engine output)
470 km/h at 1.35 ata at FS gear(corrected for guaranteed engine output)
WNr. 1792
464 km/h at 1.30 ata at ? gear (uncorrected for guaranteed engine output)
WNr. 1791
474 km/h at 1.30 ata at ? gear (uncorrected for guaranteed engine output)
In short, it just the usual Mike Williams BS.
J-347
464 km at 1.35? (detail not given) ata at ? gear
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Hmm even with US test ( 290 mph at the deck)
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Can we see the testing details of the airframes? What Werknummer, airframe condition, what boost was used, were the radiator flaps open or closed etc...?
All I can see is that they did no actual testing below 10 000 feet / 3000 m.
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So for serial 109 E-1/ E-3 speed at the deck for 1.3 Ata (5 minut emergency power) should be between 467-475 km/h
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Yes. When operating the high altitude blower (FS gear) near SL, which occured in some tests, but never in real operations.
Serial 109 E-1/ E-3 speed at the deck for 1.35 Ata was 500 km/h. Don't argue with me, argue with Willy Messerschmitt who sold these planes and guaranteed in the contract that each and every one of them will do within 5% tolerance of 500 km/h.
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So i think 500 km/h would be really absolutly limit for serial 109 E version - if so it could be do at 1.45 Ata (1-minut emergency power) and radiator close for very short time ( below 1 minut).
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No, 500 km/h is the official specification for the serial produced Bf 109E.
My source, which I already posted, says the 109E could do 497 km/h at 1.35ata, with 1/4 open radiators, without overheating.
I'd like to see your source which contradicts that.