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PostPosted: Wed Dec 14, 2016 11:59 am 
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Here are my tests of the 109K-4 flightmodel which Dawger tweaked before summer. It hits the historical speed values fairly well, and has a logical climb rate compared to the 109G-2 when taking power/weight ratios into regard. The climb curves for the 109K at the Kurfurst site don't seem correct, as they show a way to low climb rate for a plane with it's engine power vs wing area and weight of only 7496 lb (3400 kg).

SPEED
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CLIMB RATE
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<S>
/Robert


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PostPosted: Wed Dec 14, 2016 3:08 pm 
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Those figures from Kurfurst's website more than likely are at the standard climb power. It's not likely in R/L that the pilots would use the Special Emergency Power (1.80ata) to climb and take the chance of an exploding engine.

The biggest fault of virtual pilots is thinking pushing an engine to it's extreme limits doesn't have consequences. Doing so in game defeats building historical FM's with data from R/L.

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PostPosted: Thu Dec 15, 2016 1:03 pm 
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The Kurfürst tables tell you for which power setting they are meant. The pilots had Sondernotleistung released from the manufacturer, so exactly why not use it in combat? The documentation that I translated proves that the officials of LW quite realistically put procedures in action to ALLOW the use of 1.80 ata even with lower than standard quality fuel (e.g. to set the ignition to "late").
The restriction of 1.8 ata was lifted again, btw., up to 1.98 ata on most combat units until march 1945.

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PostPosted: Thu Dec 15, 2016 3:29 pm 
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Location: Somewhere over occupied Europe 1943
I think you can summarise as follows:

TYPICAL performance with B4 fuel and MW 50.
1,80 ata giving 1850 PS (1825 HP)
1,45 ata
1,35 ata


Due to poor fuel quality, they ran "late" ignition at the expense of 50PS
So 1,80 ata would only give 1800 PS (1775 HP)

*Trials at 1.98 ata with C3 fuel ongoing beginning of 1945 but never really realised.

From March 1945, they seem to be de-rating 605 DB engines at lower power levels by 0,05 ata due to fuel quality problems etc
1,80 ata
1,40 ata
1,30 ata

http://www.wwiiaircraftperformance.org/ ... 91-345.pdf

Ever wonder how the Nazis got the tetraethyl-lead to put in their fuel?

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PostPosted: Thu Dec 15, 2016 8:25 pm 
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bollok wrote:
...
*Trials at 1.98 ata with C3 fuel ongoing beginning of 1945 but never really realised.
...

1.98 really has been realised, see:

http://www.kurfurst.org/Engine/Boostclearances/605D_clearance198.html

but according to the "Reparaturanweiseung" it was'nt the norm in march 1945. Else I agree :mrgreen: :mrgreen:

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PostPosted: Tue Jan 10, 2017 1:38 pm 
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grumpy wrote:
Adding the 603 blower assembly to the 605A for higher FTH took approx. 40 PS more power from motor to turn the larger blower, so the sacrifice of some low level power for high level power is involved.

The same blower was used on the 605D series which without MW50 could still only use 1.42ata. Now the question to ask is did DB enlarge the cooling system to handle the production of more heat for prolonged use of power higher than 1.42ata? I haven't seen anything that says they did. Do you have any information on this lumino?


according to prien and rodeicke: Bf 109 G F K, the 109 G-6 oil cooler Fo 870 was considered unsufficent for the 605 AS engines and some, not all, 109 G-14/AS and G-10 received the improved oil cooler Fo 987. Fo 987 was standard for 109 K.

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PostPosted: Tue Jan 10, 2017 1:47 pm 
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Nice TY

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PostPosted: Wed Jan 11, 2017 8:25 pm 
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Flew it in ma today, seems to be right on spec. I like the burst steps. Way to Go for everyone involved!

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PostPosted: Thu Jan 12, 2017 1:43 am 
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how to switch on MW injection?

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PostPosted: Thu Jan 12, 2017 2:51 am 
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3rd step of wep is auto MW injection.

NOTICE THERE IS A NEW FORUM FOR WARBIRDS

viewtopic.php?f=11&t=15340 or

http://bhlanding.ient.com/warbirdsforum/

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PostPosted: Thu Jan 12, 2017 3:14 pm 
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btw:
in their book Me 109 F-K, radinger + otto quote the RLM document GL/C-E2 from 13.9.1944 (which i do not have )
performance of 109 K4/R-2, a recon plane:
runway for t/o: 380 m
climb rate low level: 13.5 m/sec (at 1.45 ata,?)
speed at economic cruise 645 km/h in 8.4 km, range then 585 km (1.15 ata?)
Vmax at sea level 515 km/h (1.45 ata?)
climb to 6 km in 8 min (1.45 ata? )
speed with emergency power (1.75 or 1.8 ata ) 580 km/h at 0 m and 710 km/h in 7.5 km FTH.

http://www.kurfurst.org/Engine/DB60x/DB ... ts_DB.html

this paper from 12.1944 states the same output for the 605 DB and DC :1850 PS at 1.8 ata.
605 DB with B4 fuel needs MW 50 for 2800 rpm/1.8 ata, 605 DC with C3 fuel does not need MW 50.

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