109 e4 performance

[Crumpp]

There is certainly some changes from the early 1939 data.

I really don't think development was static in Germany for 18 months before the Battle the Britain.

If the Höchstzulässige Horizontal-Bodengeschwindigkeit (Maximum horizontal ground velocity) is 485km/h, how can the max speed at 0km be 500kph?

There are other ratings the engine was approved besides climb and combat power....

We know for a fact, C3 fuel was in use during the Battle of Britian.....

Automatik propellers (CSP) also were used during the Battle of Britian that were not in use in February 1939 as the the other data is dated.

Pick your poison....

We don't know the exact conditions, perhaps it is the performance with the automatik propeller?