Bf109 test data

[JtD]

Originally Posted by Kurfürst

485 was not yet corrected to Normaltag (standard day) conditions as I understand.

It's curious though, I think it needs to be looked into. If you are right, it's an even closer match to French figures..

Yes, you are right, it's not corrected. If you apply the method they used for the Aa engine and use A-1 performance with 55 PS less at low altitude, you end up with 490 km/h (r = 0.993752), corrected both to standard days conditions at SL and nominal engine output.