The chart has at 600m a pressure of 980 mmHg pression d'admission. Extrapolating it would be at 990 mmHg at 0m. The speed is clearly close to the 480 kph when extrapolating the chart to 0m, perhaps at worst 478 kph.

5 kph velocity loss seems a bit extensive with respect to the new windscreen.

They even did not measure any difference with guns installed or not (so including the effect that for level flight higher angle of attack would have to be chosen due to increased weight of the guns).

Pression d'admission translates into inlet pressure or manifold pressure so I think this is ATA setting they used.

http://dictionary.reverso.net/french...'admission

+/- 5%.....

Of course it is valid, you're extremely kind to take it in account :grin: Much appreciated.

Now tell us how do you think the E-4 performed like.

That is range of cca 50 km/h. Do you think there was a Bf 109E-4 able to fly 525 km/h under citied circumstances?

Yea it such case E-3/E-4 would be faster then 109 F-2 which can't be true.

Try be more real.

I think 500 km/h is the highest sea level speed which could be achived by standart 109 E-3 with Db601 Aa engine and with 601A it could be even slowier ( ab. 490 km/h) with 1 minut emergency power.

You are confusing manifold pressure with atmospheric pressure, I believe.

If you read the report, it says nothing about any of the data being converted to standard conditions. Therefore it is raw data for the atmospheric conditions given.

http://kurfurst.org/Performance_test...formanceT.html

When you convert the performance to standard conditions, the results will be faster than the raw numbers in the report.

That is my opinion, too. I am trying to explain to Crumpp that the 500 km/h graph he's referencing as 'guaranteed' is way too optimistic.

It would be great to have actual variation in performance of certain type modelled in the sim.

Sure it would be able too. All aircraft performance is a percentage range over a mean average.

Including your Bf-109F....

So some Bf-109E's were just as fast as some Bf-109F's. On average though, the Bf-109F series was the faster airplane.

Understand?

Can you please convert 990 mmHg to ata for us please :grin:

You don't have to explain it to me, it is in black and white what Mtt says.

Being an experienced pilot, multiple aircraft owner, and having graduated college with a degree in Aeronautical Science, I can decide for myself what is optimistic and what is not.

Thanks! I don't feel the need to convince you one way or the other about it either. You can also decide for yourself. :) I would suggest using some scientific method or at least aviation industry standards when doing it.