Author Topic: Pyro please look at these numbers for the FW-190D9  (Read 1918 times)

Offline Naudet

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Pyro please look at these numbers for the FW-190D9
« Reply #30 on: March 03, 2003, 03:41:03 AM »
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At the end of WW2, the U.S. Army found that German test data on captured American weapons (in this case gun performance vs. armor plate) was 'better' than the U.S. data due to German testing procedures, etc.


Ouch this is totaly wrong.

Especially regarding penetration data of guns.

German test requirements for penetration values were tougher than all Allied guidelines.
i.e. if a german test mentioned that a gun had a penetration capability of 80mm at 500m, it meant that 100% of all testshots passed through those 80mms.
The french i.e. already gave a gun a certain penetration value if only 50% of the fired shots passed through.

And if you compare test reports of captured vs. non-captured planes, you will notice that german planes most often fly pretty close to the given performance datas.
Some numbers published after the War came just from Allied sources (i.e. William Greens speed data for the FW190D9 comes from a british flight test, but Green made a little fault as he always gave this speed with MW50, while the Brits did the test without MW50, cause they had none).

The only really notable difference you can find is usually in Sowjet flight tests. There all captured planes usually perform significantly worse than in factory data. But on the other hand, no Sowjet fighter that fell in German hands ever managed the Sowjet factory data.
And i dont believe this to be propaganda, cause i.e. the P51B pretty much hits the US factory data in a german test.

Offline moot

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Pyro please look at these numbers for the FW-190D9
« Reply #31 on: March 03, 2003, 03:55:15 AM »
Naudet I think he meant the data was more accurate, not whether it was more optimistic or not.
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Offline wulfie

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Pyro please look at these numbers for the FW-190D9
« Reply #32 on: March 03, 2003, 05:07:30 AM »
Quote
Originally posted by Naudet
Ouch this is totaly wrong.

Especially regarding penetration data of guns.


If we were talking about the same thing, you might be correct.

However, we are not. :)

I'm referring to the Germans testing with actual 'issue' ammunition, and several other examples as well. In '42 and '43, the U.S. was testing with 'match' ammunition for it's AT weapons (in the U.S.A.). When the ammunition actually being used by the troops in the field wound up being not of the same quality, incorrect performance and usage data wound up being given to the U.S. troops at the front.

Even with the example you cite, maybe you thought by 'better' I meant 'showing better performance'? This is not the case - I meant more accurate under field usage conditions. I think there's a language barrier here. :)

When it comes to testing for effective range, using '100% penetrations' is the data you want your crews to have. They can still fire from beyond effective '100%' range but they know that at a specific and certain range, vs. a specific target, they are going to damage it.

I've interviewed German, British, Russian, and U.S. AFV crewmen from WW2. This is partly what I base my opinion on.

Mike/wulfie

Offline Naudet

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Pyro please look at these numbers for the FW-190D9
« Reply #33 on: March 03, 2003, 06:14:38 AM »
Ah, so you actually mean, the german test data was of better quality?
Meaning, german test procedures produced more reliable data for the "User"?

Offline wulfie

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Pyro please look at these numbers for the FW-190D9
« Reply #34 on: March 03, 2003, 06:56:17 AM »
Sort of. What I'm saying is that in many cases the German testing produced better product when it came to combat equipment. They took certain things much more seriously than other Nations, which led to tactical information and improvements that helped their guys in the field a great deal.

For example - the British examined armor construction techniqes of captured German AFVs. The Germans did this and actually tested for 'block series' flawed armor. This let them know things like '41 series T-34s could be damaged/'mission killed' by big HE rounds (armor plate used in '41 series T-34s was rampant with casting faults), but KV-1s could not (not due to armor thickness, but armor quality of KV-1 plate was better than T-34 in '41).

I think it was a misunderstanding between you and I - I totally agree about the difference between what the Germans considered a 'penetration' and what other Nations did. This extended to combat aircraft by the way - German pilot armor was '.50 proof' on some aircraft, which actually meant it wouldn't fail to .50 BMG fire, period. The British considered some late war Spitfires to be '20mm proof' from the rear in certain areas. But by their definitions, the Germans would have called it '20mm resistant'.

The test data for the Germans was of better quality is some cases, from what I have seen. This mainly dealt with armor penertation, armor, etc. And in some cases mentioned above, like when comparing Russian captured aircraft data to the real thing. The Germans had a vast network with the purpose of recovering downed Allied aircraft and rebuilding them to 'combat ready' standards, for use in testing and also for 'special operations' type applications (SB-2s flying technicians out of Stalingrad in the face of Russian air superiority, etc.).

Basically, someone said that German testing could not be trusted. In general it certainly could, and in some (mainly gun/armor) cases it could be trusted more than other Nation's testing.

The U.S. tested the 75L38 of the early Shermans and the 76L51 of the M10 vs. captured German AFVs. But they did the majority of these tests in the U.S.A., using new ammunition. The actual ammunition being used overseas was of lesser quality. The result was U.S. AFV crews having flawed 'tactical intelligence data' during '42 and '43. When the Germans tested AFV weapons, they fired 'issue' ammunition in all cases, which gave very realistic/applicable results. That's just one example of several.

To sum up - there's no reason LW or German factory test data should not be trusted (contraty to what some have implied). However, I do believe that if the data on a test doesn't match AH, it's almost certainly not a case of 'bad data' being used for the AH FMs. Sometimes I think the limitations of PC code limits accuracy of FM a little, and I also think that sometimes the AH guys have several sources, some of which are not available to the players. I've seen that same group of guys fix FM problems when they were shown to exist. If there's a problem with the D-9, it will eventually be addressed (if it can be).

Some examples of 'FM bugs' I distinctly recall the HTC guys 'finding and fixing':

WB: F6F flaps were not generating proper drag. Error found and fixed (think about that - they pegged that the F6F was keeping E too well when maneuvering in the vertical with flaps deployed...).

WB: P-38 propwash was 'too powerful', giving the P-38J too much rudder authority when fighting in the vertical at low speeds (alot of 'P-38 aces' in WB sucked after this was fixed eheheh). Think about that one as well...nailing down that the P-38 rudder was working too well at low speed, in the vertical, etc.

Pretty esoteric problems to track down in my opinion.

Having said all that, I'll tell you that emailing data and FM questions is the way to go. Avoid the whole BBS argument altogether. If your data is good, and you present it well, and there really is a problem it will eventually get fixed in my opinion. Posting it to (any) BBS is always going to get a negative reaction from some.

Mike/wulfie

(edit) p.s. Naudet - I think the best way to put it is that in some cases (mainly gun/armor) German testing was of a higher standard. The comment that Fw tests are certainly 'skewed' to look better to win aircraft contracts flies in the face of everything known about the WW2 German aviation industry.
« Last Edit: March 03, 2003, 07:00:43 AM by wulfie »

Offline Naudet

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Pyro please look at these numbers for the FW-190D9
« Reply #35 on: March 03, 2003, 08:39:19 AM »
Now i got you Wulfie. And i apologize for the missunderstanding from my side.

I think AH D9s model is pretty correct.  Speed and Climb are mostly on the point, the last issue that might need some more investigation is dive performance, and that is for the whole FW190 Series in AH.

What is really sad is, that many Rechlin testdocuments (together with other GE testsites) were destroyed. Rechlin should have the best data on german planes, as they actually tested production maschines.
These tests were down to either verify the performance data the manufacturer gave and to examine the production spread (no idea if that is the right term, they tested multiple productions machines to see how much average difference in perfomance there was).
Also the testsites were the place were captured airplanes were examined and put through multiple tests.
One very interesting fact is that German Testsites had "Beutetreibstoff" (capture fuel), so that they could fly the US planes i.e. on high Octane USAAF fuel.

As far as my knowledge goes about german test procedures, they actually did everything possible to get a realistic picture of the equipment.

To me german performance charts are as trustworthy as US or Britisch ones.


Edit: Wulfie, saw your answers in the FW190-A9 thread, could you drop me an email, as i am also one hell of a D9-maniac and have spend lots of time researching this plane. Would like to question/discuss a few things with you personally.
« Last Edit: March 03, 2003, 08:50:49 AM by Naudet »

Offline Pyro

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Pyro please look at these numbers for the FW-190D9
« Reply #36 on: March 03, 2003, 11:08:31 AM »
Thanks for the info.  I don't have time to research an answer now, but we will be doing an extensive review of planes and making corrections if needed as part of 2.0 development.

Offline AGJV44_Rot 1

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Pyro please look at these numbers for the FW-190D9
« Reply #37 on: March 03, 2003, 11:52:12 AM »
Thank you Pyro for the response and that you will look into this.  Please keep us up to date on things when you have the time.  !

Offline Naudet

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Pyro please look at these numbers for the FW-190D9
« Reply #38 on: March 03, 2003, 12:34:53 PM »
Btw Pyro, if you need scans of the FW documents were those number came from, drop me a line. Somewhere i should have a complete scan, not only the charts but also the calculations pages.

Offline moot

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Pyro please look at these numbers for the FW-190D9
« Reply #39 on: March 03, 2003, 01:14:03 PM »
Thank you very much.
« Last Edit: March 03, 2003, 01:16:32 PM by moot »
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Offline Glasses

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Pyro please look at these numbers for the FW-190D9
« Reply #40 on: March 03, 2003, 10:48:50 PM »
I think mainly and I've seen this for a while AH's Dora is more consistant with  '44 Doras and some of the better numbers seen about the Dora are '45 doras yielding  2k + HP w/MW50.

Offline Lazerus1

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Pyro please look at these numbers for the FW-190D9
« Reply #41 on: March 06, 2003, 02:54:20 AM »
Quote
Originally posted by Pyro
Thanks for the info.  I don't have time to research an answer now, but we will be doing an extensive review of planes and making corrections if needed as part of 2.0 development.


Pyro, thanks for the response.