Kurfürst - Bf 109 Performance Resource site UPDATEs

[whazaa]

Originally Posted by *Buzzsaw*

Salute

For a period of time, the 190A3 and A4 were derated to 1.32 ata boost pressure from the normal maximum of 1.42, because the BMW 801D was having problems with overheating and damage to the engine. After the problem was resolved, the allowable boost was increased back to 1.42..

none of the 801D series had pb's with overheating, the C series did and the modifications on the C-series gave birth to the D series.
No D series seems to have been derated ,except for the first 10 work-hours.
(usual procedure)

Originally Posted by *Buzzsaw*

The Soviets and British both captured models which were derated...

The british did "received" a A3 but was it really derated? the first repport (that you won't find on the williams's page... ) quotes the admission pressure used while comparing the A3 to the spit5/9-p51b/p38f/typhoon. It was 1.42Ata. the second test you can find at spitfireuberalles's page indicate a maximal pression of 1.32ATA and only a max of 2450 Rpm used in the test instead of the 2700 used on the first comparative test...for the same plane!

The soviets captured a 190 with the spinner out and placed a stuka spinner on it! it's like testing a ferrari430 with a 60' V6 engine or a Renault5 1.4L with 18" wheels!

Originally Posted by *Buzzsaw*

In any case, by using manual prop pitch in IL-2 a 190 pilot, (all models) can get BETTER than historical performance out of the aircraft, (something which wasn't the case in real life, the Kommandogerat system was more efficient than operating manually) so you can see that there is no conspiracy against the 190's.

and overheating like a piggy in menopause when doing that.

No consiparcy???

and what about the acceleration? the spinner not getting at it's optimal angle?...and more....and more...and more...

Originally Posted by *Buzzsaw*

In fact there are quite a few more Allied aircraft which are modelled on lower performance versions than German. The Tempest is just one example, being modelled at +9 boost in IL-2, only 5% of the Tempests made used that boost setting, most operated at +11 boost, and some at +13.

yeah, right and having a Cx of of a Saturn5 rocket! beeing able to turn faster and shorter than a 190! Read the repport on william's page on the test Tempest Vs 190A3 and about the 5% at9boost, do you have any exact data on those +/-450 airframes build? Cause i could also tell you than from nov43, all the 190 received a 1.65ATA 801D engine build with parts of the 801F type engine, but would you belive me without any orginal source?

[ICDP]

Kurfurst is a great source for material for the 109 and Spitfireperformance is a great source period. The problem is that both sources are provided by blatantly biased people. The best course of action is to find many sources and come to your own conclussions. Be carefull reading books that don't show the original source, they tend to guote the same source (usually a wrong one). For example the Bf109G6 in clean condition should reach about 400mph but is very often shown as having a top speed of 386mph.

From my experience over the years on various sites Buzzsaw is blatantly biased (think Red Kurfurst). He is one of those people who makes ridiculous claims that in genreal Allied AC in IL2 are porked and Axis AC are overmodelled (see above for evidence of this). Remember to filter out the massive bias some people have on these forums and you can use their sources with other sources to make an informed opinion.

The truth is that ALL aircraft in IL2 have problems that are nothing to do with conspiracy theories or bias from the developers. The simple answer is that there are so many AC in IL2 that people will always find fault and conclude their favourite plane is porked on purpose. One of the biggest mistakes is to read one or two pilot reports that show little or no detail more than "I easily turned inside the 109 with my P51 and shot it down" and expect the exact same outcome every time in IL2. This is a bad move because from the original report you need to know the following. At what alt was the engagement? At what speed was the engagement? What type of 109? What was the relative pilots capabilities? (something that can rarely be known). Did the 109 have gunpods? On many occasions in IL2 I outturned a 109 in a P51, or a Spitfire in an Fw190A but I know that that is only possible given the right set of circumstances and in no way does it make it always true. So if you get outturned or outclimbed in a suposedly inferior AC then ask three simple questions. 1. Did I missjudge our relative energy states. 2. Did I underestimate the other pilot? 3. How did I mess up? This is easier said than done bcause the natural reaction is to never blame yourself for losing!

In short, read many different sources to eliminate natural bias. Learn to recognise bias (not everone is as blatant as Kurfurst or Buzzsaw). Pilot accounts are a great read but tell next to nothing about relative performance because most variables are left out.

[Kurfürst]

Buzzsaw and 'AL Schlageter' are two notorious trolls who seek to use this thread as playground for their personal feud.

As you can see he is very concerned about this document on DB 605D technical issues from early 1945 - the document is BTW widely known for several years now and is available for download from the internet as well. He is posting this version with an online translator for about the tenth time now under his various login handles, every time he is being told that there is no problem with including this material as well to the site if he can transcribe the original (which he probably already did, given he has an online translated version of it).

Somehow, it ever gets past that point, so I have to doubt the sincerity of his 'concerns'.

It has been also discussed a dozen or more times times that the boost clearance for this rating went out in 19 March 1945, clearing the 1.98ata boost for four Bf 109 wings of the LW (of JG 27 and JG 53 on the Western Front).

A for Buzzsaws accusations about the material being 'edited, cropped' on my site, I think I would know about that, so I need specific examples. Failure to name them will be equivalent of an answer as well.

As their only intention here being to turn this thread into a ubi-like monkey cage with insults and feuding, the moderation team here has been consulted.

[Al Schlageter]

Originally Posted by ICDP

Kurfurst is a great source for material for the 109 and Spitfireperformance is a great source period. The problem is that both sources are provided by blatantly biased people. The best course of action is to find many sources and come to your own conclussions. Be carefull reading books that don't show the original source, they tend to guote the same source (usually a wrong one). For example the Bf109G6 in clean condition should reach about 400mph but is very often shown as having a top speed of 386mph.

From my experience over the years on various sites Buzzsaw is blatantly biased (think Red Kurfurst). He is one of those people who makes ridiculous claims that in genreal Allied AC in IL2 are porked and Axis AC are overmodelled (see above for evidence of this). Remember to filter out the massive bias some people have on these forums and you can use their sources with other sources to make an informed opinion.

In short, read many different sources to eliminate natural bias. Learn to recognise bias (not everone is as blatant as Kurfurst or Buzzsaw). Pilot accounts are a great read but tell next to nothing about relative performance because most variables are left out.

Good post ICDP except I would say the Hungarian is the one who is the more biased. This from the various threads I have read in which he and Mike Williams have participated in. In every thread Mike Williams has always been polite and cordial unlike the other participant.

Now Kurfurst has already many translated documents on his site. He has a translated version of the document and the original document so why can't he refine the translated document and include it on his site? Kurfurst has no reason not to include the document, even if still in German, except for the fact it does not show the 109 'in a good light'.

As to what is in Baubeschreibung für das Flugzeugmuster Messerschmitt Me 109 mit Daimler-Benz-Motor DB 601, there is some discrepancy with L.Dv. 556/3. (ie 460kph @ 0km)

Unfortunately, if one questions 'the party line' on his forum one is PNGed, leaving one no recourse than to do so on other boards.

[ICDP]

I would say that Kurfurst is one of the most 109 biased people I have ever seen on any WWII aviation board. He undoubtedly knows a lot about the 109 and his web site and information are invaluable (thanks Kurfurst). The problem he has is that he cannot be relied upon to give an unbiased opinion. Buzzsaw is of the same mould and always aims to show the Axis AC in a bad light while cherry picking the good points of the Allied AC.

I must point out ALL people are biased in some way, the trick is to ignore your bias and see the truth. I for example don't like the looks of the Spitfire but know it was without a doubt an outstanding fighter aircraft. I love the Hurricane but accept that it was outclassed by most of its opponents. I love ALL WWII aviation from ALL sides, I don't look at good v evil I only see WWII combat AC and that is my passion. I can happily fly a plane that has a swastika painted on its fin because I know it doesn't make me a nazi. I can happily shoot down the good guys because it is only a sim and noone is actually dying or getting hurt.

The best advice I can give someone who flies in IL2 is to fly both sides. You will come to see that each side has its fair share of FM/DM problems.

[Kurfürst]

Some new updates to the site. DB 605ASM power curves, 605DB/DC details of allowable manifold pressures etc.

[Kurfürst]

Some new material has been added:

Messerschmitt AG. Augsburg - Die Kurvenwendigkeit der Me-typen II. Teilbericht.
The turning performance of the Messerschmitt types II. Partial report.
Technischer Bericht TB Nr. 17/40.
August 1940.

Messerschmitt A.G. Projektbüro theoretical study of the turn performance of various Messerschmitt types. This partial report contains the theory behind calculating turning radius and time, illustrated on an example of a Bf 109E in sustained and diving turns, as well as misc. information such as propeller effiency curves for Bf 109E, Bf 109F-4, Bf 110C, Me 209 and Me 210.)

In German.

[SiThSpAwN]

Originally Posted by Kurfürst

Some new material has been added:

Messerschmitt AG. Augsburg - Die Kurvenwendigkeit der Me-typen II. Teilbericht.
The turning performance of the Messerschmitt types II. Partial report.
Technischer Bericht TB Nr. 17/40.
August 1940.

Messerschmitt A.G. Projektbüro theoretical study of the turn performance of various Messerschmitt types. This partial report contains the theory behind calculating turning radius and time, illustrated on an example of a Bf 109E in sustained and diving turns, as well as misc. information such as propeller effiency curves for Bf 109E, Bf 109F-4, Bf 110C, Me 209 and Me 210.)

In German.

Do you still have this document? If so, see my PM to you... thanks!