[klem]

OK Guys, thanks.

We don't seem to have a problem with the historical performance curves, only the particular engine in use.

My memory, as ever, being a little unreliable I had forgtten a book I have tucked away called Bf109 by William Green. I found it last night and he talks about the V series including V15 which had the DB601A engine and in the same sentence says "this was the engine variant used by virtually all Me109s for the first 18 months of the war." But I guess that will only fan the flames.

None of which solves the argument unless someone has production/installation figures for the A and Aa which might lead us to a decision. Even that would no doubt be contentious as I imagine there could be a case for both engines.

SO, I am going to separate the issues. I'll test at 1.3ata AND 1.35ata with 2400rpm and 1/4 radiator and put back ALL of the curves I had in the beginning. This will:
1. Tell us what CoD 109E-3 is doing (my main aim)
2. Let everyone else return separately to the bun-fight over what we should be getting.
3. Raise the question "what do 1CMG think they are giving us".

And 3. is the real point for those that disagree. That's where the A and Aa camps should be directing their energies.