Bf109 test data

[Kurfürst]

Originally Posted by Robo.

Just reading and summarising the information in this thread, ideally there would be both engines modelled:

DB 601Aa for E-3/B, E-4/B (and E-7 eventually)
DB 601A-1 for most of the other Emil variants, especially without bomb racks installed (E-1s, E-3s and E-4s in the sim)

It is known that due to overhauls and re-builds, there were all combinations possible and I am not taking the superchargers in account.

Only cca 3 out of 10 DB 601s made were Aa.

Probably that would be the best historical approach, though since there was a lot of E-7/N (in fact most the post-bob production which will make appearance in BoM) I would say that 601N would be a more practical choice.

Problem is, we are end of the development line, and 1c certainly not going to give us 3 seperate variants. The only diffo between the A and Aa is probably that the latter is maybe about 10-15 km/h faster down low.

DB 601Aa = full throttle height of 4000m, rated at 1,35 ata (1,45 max)
DB 601A-1 = full throttle height of 4500m, rated at 1,3 ata (1,40 max)

Looking at the above, the only DB601 modelled in the sim has got the rated power of Aa and fth of A-1.

Depends. Engines have higher FTH in high speed flight. An Aa should get about 3700m in climb and 4800 m in full speed flight (the latter being a bit problematic with the current poor altitude model)

Any documents at the different FTH of the two above supercharger types? Different supercharger (improved or new design) usually shifts the power curve of an engine, e.g. gaining in low level performance for the cost of lower fth. Alter und Neuer Lader do reflect this change in the Baubeschreibung page posted by Buszsaw.

Yes I do have these old/new 601A curves but I believe both are uploaded to aircraftperfomance.org recently.

We do have these rated power but we also have the FTH of 4,5 km. See above. It is my understanding that the neuer und alter Lader reflects the A-1 or Aa subtype in the relevant documents because these were only referred to only generally as DB 601A without specifying the subvariant. Aa was indeed intended for export, but ended up being used by the Luftwaffe in considerable quantities (cca 25%) and on pretty much random basis.

Yes more or less that's my understanding too. Of course the Aa has curves too, but these are Mercedes's own manual.