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Old 09-18-2013, 07:21 PM   #1
Yo-Yo
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Default Jumo-213A for Dora

As I wrote before, Jumo-213 engine is not simple and is not similar to the Merlin that became well aquainted during previous work. And as the basic model is rasping in the project code to the desired form of Jumo-213, it's possible to show the results got in vitro - in the special tool allowing full and fast multi-dimensional investigation of engine parameters and its tuning.
Reference points for power were taken from Motoren-Handbuch, Dec 1943, but as the fuel consumption key figures in this manual are for original MBG schedule that did not allow power ratings higher than Start - u. Notleistung (3250 rpm and 1.53 ata at SL), the schedule was taken from Ueberholungs - Anleitung, Oct 1944 for increased fuel flow scheduling, and reference point for specific consumption were calculated combining data for two sources.

The second diagram is very distinctive for the Jumo-213 (Motoren-Handbuch, Dec 1943). Manifold pressure vs ambient temperature at sea level dependance shows that constant air mass flow automatics keeping almost constant power vs altitude changing tries to keep constant power vs temperature changing but with less success, though.
Two parallel lines shows tolerance limits for the dependance from manual, and the blue line is the model response.

I emphasize that the diagrams show the model response to the ambient air condition. The live model uses fundamental parameters for the engine producing its performance as a result of complicated calculations.

So, as some of these parameters are unknown (MBG cams shape, for example, or exact blower chrachteristics) I need to adjust them for the overall performance or calculate, so overall set of obtained characteristics is a result of harmonisation and compromises...
Anyway, all curves have their distinctive shapes.


My special thanks to MACADEMIC for the priceless sources translation from German!
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Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me

Last edited by Yo-Yo; 09-18-2013 at 07:45 PM.
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Old 09-18-2013, 07:25 PM   #2
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Really interesting Yo-Yo, I love the level of detail that you go into with your work

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Old 09-18-2013, 07:29 PM   #3
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I love this stuff, don't understand much of it, but I love it.

Nate
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Old 09-18-2013, 07:33 PM   #4
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Gah, I want to fly her already
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Old 09-18-2013, 07:41 PM   #5
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Quote:
Originally Posted by Nate--IRL-- View Post
I love this stuff, don't understand much of it, but I love it.

Nate
Is it due to my English?

And sorry: I did not mention that MBG is Engine Conrol Unit - a hydromechanical computer allowing to control prop and engine using only one lever.
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Ніщо так сильно не ранить мозок, як осколки скла від розбитих рожевих окулярів
There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles.
Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me

Last edited by Yo-Yo; 09-18-2013 at 07:44 PM.
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Old 09-18-2013, 07:48 PM   #6
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We're so lucky to have you and people like you Yo-Yo. Keep up the great work.
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Old 09-18-2013, 07:55 PM   #7
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Haha, the wolf pack was starving, about to turn on themselves.

So they threw us a bone.

Alright, we'll chew on that for a couple of days
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Old 09-18-2013, 08:03 PM   #8
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Impressive.
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Old 09-18-2013, 08:29 PM   #9
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Quote:
Originally Posted by Yo-Yo View Post
Is it due to my English?
No, definitely not. It's your intellect - you are simply too clever and me for one struggles to keep up with the technical aspects
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Old 09-18-2013, 08:41 PM   #10
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Quote:
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No, definitely not. It's your intellect - you are simply too clever and me for one struggles to keep up with the technical aspects
Funny I said almost the same thing to him last time I met him!

Those Diagrams you drew at the time Yo-yo still baffle me lol
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