109 e4 performance

[Kwiatek]

500 km/h could be probably reached with DB601Aa motor which had 1175PS power output at sea level at 1.45 Ata 2500 RPM.

These is 75 PS more then with 601A ( 1100 PS).

Also these data above is probably for old supercharger (4.0 km FTH).

There are data where 109 E-3 reached - 467 km/h at deck - so a few km/h more, so probably also maximum speed ( at 1.4 Ata) would be little higher then 485 km/h - about 490 km/h. It could be difference in radiator position.



These is power output with newer supercharger which rised maximum speed at FTH - with old there was 555 km/h with new one it was 570 km/h.

[Kurfürst]

Originally Posted by Kwiatek

500 km/h could be probably reached with DB601Aa motor which had 1175PS power output at sea level at 1.45 Ata 2500 RPM.
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These is 75 PS more then with 601A ( 1100 PS).

Also these data above is probably for old supercharger (4.0 km FTH).

There are data where 109 E-3 reached - 467 km/h at deck - so a few km/h more, so probably also maximum speed ( at 1.4 Ata) would be little higher then 485 km/h - about 490 km/h. It could be difference in radiator position.

http://www.wwiiaircraftperformance.o...109e3-1792.jpg

Regarding the 1792 serial number Bf 109E-3 trials you posted, note the following note by the tests makers at the bottom for 467 km/h:

"These speeds has been corrected for normal (standard) temperature, and correct manifold pressure regulator settings (I guess that is the German way of saying: nominal boost) but not for the guaranteed (ie. nominal) output of the engine."

In other words, this test is for unknown power from the engine. All engines vary in output, sometimes quite considerably, and this would effect results. I would hazard to guess that the airframe may have been a poor one (remember: 500 km/h means anywhere between 475 and 525 is okay for service acceptance), and the airframe may have been a bit down on power.

Here's for example another Emil tests, showing the performance with the engine slightly down on power (developing 45 horsepower less than it should, lower figures) and corrected to nominal engine output (higher figures). This is actually the only test I've seen where anybody measured the used engine's output on a engine test bench.

With the sligthly down-on-power state for the DB 601Aa engine we have in the sim, this Bf 109E (V15a prototype actually, but its identical to the serial E-1 model), radiator 1/4 open, they got 493 km/h at 0m, and correcting the figure for the nominal full power output, 498 km/h.



Also 1.3ata is for the 601A-1 engine, the 500 km/h speed is understood for the slightly more potent 601Aa (though I do not believe, based on tests, that the difference would be greater than 10 kph at low level). So for an airframe just hitting the 475 km/h bottom of the acceptance limit, and having the bit less powerful 601A 467 km/h seems quite understandable.

Note though - COD seems to have choosen to model the DB 601Aa version for the Emil.

However this would represent a sub-standard aircraft. There were such, of course, but it begs the question, why would the premiere LW fighter aircraft of 1940 would be represented as a sub-par example, while RAF fighters using the performance of avarage good planes....?

Especially as the new COD engine is capable of simulating wear and such.

These is power output with newer supercharger which rised maximum speed at FTH - with old there was 555 km/h with new one it was 570 km/h.

I don't think so, the French trials of 1304 confirmed the 570 km/h top speed (and I believe it wasn't even full 1.3ata at altitude), and it is known for certain that 1304 had the old type supercharger.