109 e4 performance

[Robo.]

Originally Posted by robtek

I really can't understand why there is still disagreement about the max. speed of the Bf109E.

When the manufacturer calculates a speed for a model and verifies this with flight-tests, and sells the plane according to this values

There is no disagreement at all. As you say, manufacturer calculated speeds in certain conditions, but he never verified them with flight tests. The main reason being it was not really possible, the data are simply theoretical speeds. All that is good enough, but these speeds never achieved in any actual empirical tests (again, various reasons). The problem is that this is a matter of opinion. Mine is that average E-4 with DB 601Aa engine was well capable to reach 500km/h at 1.45ata ('1) (take-off power at sea level, rads fully closed or 1/4 open), but it would be unwise to model all Emils in the sime like that or even worse, using more optimistic data (say 525km/h) for average plane in the sim. Therefore, I was trying to come with some rough guideline and some numbers for rated power for bothe engines in questions. I believe this can help getting the FM right (regarding how the real thing flew including certain variability) more than comparing each other opinions.

I pretty much agree with 41Sqn_Stormcrow's insight above, Crumpp's calculated data are still very close and good enough for the sim (Aa engine).