Bf109 test data

[JtD]

Originally Posted by Kurfürst

At SL.

DB 601Aa, 1,35 ata (1045 PS) : 498 km/h (V15a @ 1.35 = 498 km/h, Baubschrb.5% @ 1.35 = 500 km/h)
DB 601A, 1,30 ata (990 PS) : 489 km/h (V15a @ 1.31 ata = 493 km/h, French109 1.3ata = 485 km/h)*

493 of V15 @1.31 were done at 500m altitude, at SL this was extrapolated to 485.

[Kurfürst]

Originally Posted by JtD

493 of V15 @1.31 were done at 500m altitude, at SL this was extrapolated to 485.

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..

[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.