LW aircraft speed specifications

[bongodriver]

.....I dunno, just wanted to get on the winking bandwaggon.

[Osprey]

Originally Posted by Kurfürst

Well TsaGi actually measured their Bf 109G-2 a bit faster than the German 'official' specs...

And it's that which you decided to publish as actuals on your website.......

[Plt Off JRB Meaker]

Originally Posted by bongodriver

.....I dunno, just wanted to get on the winking bandwaggon.

Yeah.....there's plenty of winkers on here

[Kurfürst]

Originally Posted by Osprey

And it's that which you decided to publish as actuals on your website.......

Problem? The first test published on the 109G the website were actually the worst ones (WNr. 14 026). You have there the worst and best tests, and everything between them.

[Osprey]

Which ones do you believe?

[Kurfürst]

Originally Posted by Osprey

Which ones do you believe?

Well, personally I believe the official specs (given with +/- 3% tolerance) are in good agreement with most tests, see Erla trials of 13 serial production airframes in avarage almost exactly macth the official figures; this is also true for the Soviet trials.

The rest are also well within this +/- 3% production tolerance, given variations in equipment etc.

[Crumpp]

A. S. Nikolay Gerasimovich, sometime relatively long ago I was speaking with a pilot—a frontline veteran. Right after the war they flew in captured aircraft. And no matter how hard they tried, they were unable to attain the speeds the Germans had written in their specifications. The shortfall in speed was significant. In the end, they prevailed upon a German, a high-level specialist, and asked him, “Why this shortfall in speed? Are we using the engine’s capability incorrectly?” His response was that they would never achieve the target speed, because the German specifications showed the theoretical speed, and they were attempting to attain that speed on their instruments.

Nikolay Gerasimovich, in your view, is this possible?

N. G. Of course. We had a group of specialists with us from NII VVS. They were examining specifications and were looking at speed. “What speed is indicated at 7,000 meters? 780? Take away 100. And what about 3,000 meters? 700? Reduce it 70 km.” This is how they calculated the instrumented speed and, characteristically, almost always hit their target. Perhaps they knew something about our focus on speed.

zipper hit the nail on the head.

Yes, they are talking about the difference between indicated airspeed and true airspeed.

Here the Germans relate they will not see the performance on the Kennblatt curves (Vwck or TAS) on the airplanes airspeed indicator (Va or IAS).

His response was that they would never achieve the target speed, because the German specifications showed the theoretical speed, and they were attempting to attain that speed on their instruments.

Here TASGI or the manufacturer is attaining the airspeed calibration curves for instrument error.

We had a group of specialists with us from NII VVS. They were examining specifications and were looking at speed. “What speed is indicated at 7,000 meters? 780? Take away 100. And what about 3,000 meters? 700? Reduce it 70 km.” This is how they calculated the instrumented speed and, characteristically, almost always hit their target. Perhaps they knew something about our focus on speed.

No conspiracty theory required!!!

As for the state of German aerodynamics, I posted the following articles from the American Institute of Aeronautics and Astronautics library for you guys to enjoy!

[Crumpp]

http://www.nar-associates.com/techni...ide_screen.pdf

[ATAG_Doc]

I read inferiority complex.

[5./JG27.Farber]

Originally Posted by Osprey

I think you need to prove that.

I think YOU need to prove it.



The TAS or IAS makes good sense to me.