The 109 is too good

[Hummingbird]

On 10/13/2021 at 9:57 PM, saburo_cz said:

2800RPM for SonderNotleistung  vs. 2600RPM for Steig-Kampflstg. ...

 

So, difference between results for test with propeller 9-12199 and with 9-12159 (DCS) is 15kph in case SonderNotleistung . 

For Steig-Kampflstg will be nearly the same. 

Calculation for plane with 9-12199 propeller and 2600RPM shows 690 kph, then for 9-12159 (DCS) is 690 minus 15. At least ...

 

Nope, 694 km/h is with  std. series prop.

With the Dünnblatt the speed rose to 706 km/h.

Performance is spot on.

Edited October 15, 2021 by Hummingbird

[saburo_cz]

Power for 2800RPM vs. 2600RPM, no one see the difference?

 

[iFoxRomeo]

54 minutes ago, saburo_cz said:

Power for 2800RPM vs. 2600RPM, no one see the difference?

 

There is no curve for 2600rpm with std prop.

694km/h with 2800rpm at 9000m and std prop.

What is the issue?

 

 

Edited October 15, 2021 by iFoxRomeo

[saburo_cz]

7 minutes ago, iFoxRomeo said:

There is no curve for 2600rpm with std prop.

694km/h with 2800rpm at 9000m and std prop.

What is the issue?

 

 

 

1. i know that ...

2. DCS K-4 at 9000m, 2600RPM  - 690+kph, 2800RPM - 705+ kph (WITHOUT MW50)

3.well what?

[iFoxRomeo]

On 10/9/2021 at 12:37 PM, saburo_cz said:

The Bf 109K-4 performance are "optimistic" primarily above critical altitude. Which at 29 000ft are.

 

At 29k ft the 109 has speed advatnage over the P-47 roughly 30kph, and over the P-51 roughly 15kph.

All planes with maximal power, without WEP, ADI or MW, this altitude is quite above critical altitude for these increased powers.

 

The one reason why we have these results may be coolant systems.

The 109 during flight, horizontal high speed flight, has coolant`s flaps nearly closed, but the US planes don`t. They must have the coolants flaps fully opened and still the coolant itself is nearly on the maximal value ... During horizontal high speed flight.

 

The 109 reaches 690 kph at 9000m (29500ft) in DCS, it should be slightly fewer ...

 

14 minutes ago, saburo_cz said:

1. i know that ...

2. DCS K-4 at 9000m, 2600RPM  - 690+kph, 2800RPM - 705+ kph (WITHOUT MW50)

3.well what?

You didn't say that before.

At 7400m MW-50 is supposed to be switched off. So sonder-notleistung can be used without MW-50 above this alt.

The problem of this chart is, that it is a calculated chart. No actual flighttest. I find it difficult to discuss the performance without measured values.

[saburo_cz]

3 hours ago, iFoxRomeo said:

You didn't say that before.

I did, i just expected that the difference between maximal power and special emergency power is clear, i will try to be more specific in future to avoid such confusion.

Actually it does not matter, IMO the DCS K-4 is still slightly optimistic (above critical altitude) even with special emergency power setting.

 

3 hours ago, iFoxRomeo said:

it is a calculated chart

I guess, all here knows that.

But, we unfortunately do not have something better. And moreover, ED never released what is base for their power/performance for the 109.

These calculations were usually rather accurate.

 

3 hours ago, iFoxRomeo said:

I find it difficult to discuss the performance without measured values.

And still, you do that.

Edited October 15, 2021 by saburo_cz

[Hummingbird]

I can't hit 694 km/h at Steig u. Kampfleistung (2600 rpm) and 9 km, I am at full power (2800 rpm) to achieve that in the K4 ingame, and since MW50 makes no difference at that alt I have that switched off. 

You have to be absolutely sure you achieve the speed perfectly level, and don't dive to achieve a higher speed, which the aircraft will maintain for quite a bit before slowing to the max sustained speed. 

 

Edited October 15, 2021 by Hummingbird

[saburo_cz]

10 hours ago, Hummingbird said:

I can't hit 694 km/h at Steig u. Kampfleistung (2600 rpm) and 9 km

Me neither on default map. Did you try it on map with standard atmosphere?

10 hours ago, Hummingbird said:

You have to be absolutely sure

Yes, i have.

It was, start from RWY, climb to altitude - measure, climb to next - measure ... ... ...up to 12000m.

Full fuel tank (unlimited fuel), empty aux. tank.

 

This table is quite old, but seems to be still valid.

Edited October 16, 2021 by saburo_cz