109 e4 performance

[Crumpp]

we can not assume automatically that the actual performance of Aa Emils was always 500km/h.

Of course not, 500km/h is just the mean.

Just what I said, engine not quite ready

Right, we agree on it.

I was simply asking how do you think the Emils with both A-1 and Aa should be modelled in game including the limits of the ratings.

Ok, I might do that for you if I have the time.

The 50km/h difference is some 5-10km/h too big when compared to other test. I believe this is due to different ata setting during the two flights being compared at 5000m.

5-10Km/h is nothing. It could be bugs on the leading edge and windshield....

This is why I don't get too involved with these kind of discussion's. You claim I think I know everything. Well, I don't. I do know airplane performance and the science of flight.

It winds up being an argument over every little point.

They got worse climb results.

Ahh so they did. Interesting but I think if you check out their radiator settings and compare it to what the Germans used you might find your answer.

They flew a large part of that climb regiment with radiators fully open and an engine on the verge of overheating. I imagine the fuel metering system set up for synthetic fuels did not like the French fuel.

The climbing was done at the Center with the radiators open up to 4000 m. then progressively closed until 8300m. It is possible that the different components (1) used by the German tests could permit climbing with closed radiators.

Different components is the oil and coolant. Additionally the French though the speed range is the same as the climb range. It is not. The percentage error over mean for climb performance Mtt says is 8%.

Given that, even with radiators open, the climb performance is within 7 seconds of the German results at 1000M.

One thing about recording climb performance. It is one of the hardest areas of performance to nail down accurately because it depends on so much that changes.

The French instrument error is 3% too.

[Robo.]

Thanks for the reply Crumpp - as you see I am not in any kind of disagreement. The calculations are not really for me, rather for the sim. I find it interesting and if the 1c guys happen to read this or if it gets reported, we might as well end up having Emils closer to the real thing FM-wise. I know I am naive

5-10 km/h - i got your point point, but it is really about these small details and I pointed out that the 2 flights compared (rads open / closed) at 5000m were at different MFP and the difference was perhaps smaller than 50km/h.

Also agreed on the climb performance -most difficult to measure as enviroment is a massive factor. Funny thing is they got the top speed right and climb so much off when the a/c was the same. I also believe it might be fuel / coolant / oil / instruments. I also believed that particular 109 has been slightly damaged before - hence the 'components' thought, not just fluids. No further info on that provided...

As for the actual figures and calculations for top speed at sea level:

DB 601 A-1 / 9-9518A

1.40 ata 2400RPM 1100HP (1 minute)
1.30 ata 2400RPM 990HP (5 minutes) radiator 1/4 open 467km/h
1.?? ata 2200RPM 810HP (30 minutes)

DB 601 Aa / 9-9518E

1.45 ata 2500RPM 1175HP (1 minute)
1.35 ata 2400RPM 1045HP (5 minutes)
1.15 ata 2300RPM 950HP (30 minutes)

Anyone cares to fill in the blanks, ideally rad fully open / rad fully closed + E-3 E-4 aerodynamics + /B aerodynamics?