Author Topic: Dora experts ... (Read 5116 times)

GScholz · « **Reply #75 on:** June 01, 2004, 04:00:22 PM »

I got my number by googeling for gasoline weight. My number was listed as "vehicle gasoline". If your number is more correct, then my Gal/h numbers are a bit high. Well ... that's one hour I'm not going to get back.

gripen · « **Reply #76 on:** June 01, 2004, 04:17:55 PM »

B4 and C3 density here

gripen

GScholz · « **Reply #77 on:** June 01, 2004, 04:29:07 PM »

B4 "0.710-0.760" That's pure luck! My number was 0.732.

GODO · « **Reply #78 on:** June 01, 2004, 04:36:50 PM »

Thaks a lot Grippen

GODO · « **Reply #79 on:** June 01, 2004, 05:04:43 PM »

Now I have a doubt, max throttle is giving us 3000 rpm, is that we have 1700Ps without WEP? WEP is giving us 3250 rpm, is that for 2240Ps or 1900Ps? shouldn't it be max throttle 1900Ps 3250rpm and WEP 2240PS 3250rpm also?

GScholz · « **Reply #80 on:** June 01, 2004, 05:13:01 PM »

No, WEP is 2240PS, MIL is 1700PS (Steig und Kampfleistung).

GODO · « **Reply #81 on:** June 01, 2004, 06:50:33 PM »

Any idea of how much time 1900PS/3250rpm can be substained? AFAIK MW50 can be injected at sea level only once you are already doing 3250rpm and never before, that is, with the throttle lever in the takeoff/emergency power position.

Crumpp · « **Reply #82 on:** June 01, 2004, 07:43:24 PM »

I would really appreciate if someone could just produce an RLM document with the Jumo 213 series using C3.

This community can come up with some excellent documentation so I know the proof is out there.

Nothing I have seen shows the Jumo 213 using C3.

Thanks
Crumpp

GScholz · « **Reply #83 on:** June 02, 2004, 11:27:38 AM »

If anyone's interested you can buy copies of original handbooks and documents on German aircraft and engines here:

http://www.luftfahrt-archiv-hafner.de

Junkers engines:

http://www.luftfahrt-archiv-hafner.de/Teilliste8-JUMO-Tab.htm

Crumpp · « **Reply #84 on:** June 02, 2004, 11:34:34 AM »

Thanks,

I found that link a few days ago and have a 190A8 pilots manual coming my way. Thinking about getting the BMW 801 and Jumo 213 manuals too.

Crumpp

GScholz · « **Reply #85 on:** June 02, 2004, 12:02:30 PM »

Nice, when you get it find out what speed limitation they had on flaps will you?

Batz · « **Reply #86 on:** June 02, 2004, 12:35:15 PM »

Just go to the site in GS's original post and email the webmaster. The data he has on his site comes from charts he has. He used to link the charts but took them down.

Naudet has a copy I believe he posted on this forum but he no longer visits this forum or plays AH.

I believe both Funked and Gatt have english translations of the A8 manual.

niklas · « **Reply #87 on:** June 02, 2004, 03:24:14 PM »

Quote

Originally posted by Crumpp
I would really appreciate if someone could just produce an RLM document with the Jumo 213 series using C3.

This little doc
http://de.geocities.com/stefan_l_01/fzg/Jumo213_Nov44.tif
is a multi-image tif file with 2 pages. You need kodak imaging program or convert it to a pdf in case you have acrobat. Or use any other programm that can view multi-image files

Anyway, next to some nice informations about the Jumo, especially the AG version, you find right at the beginning of the 2nd pagethe information
Kraftstoff:
Bleibenzin B4
notfalls C3

which clears the Jumo for C3 but only if no B4 is available (because it´s a engine chart i don´t believe it´s due to shortcoming of C3 fuel. It must have had other reasons. High aromatic fuel burns hotter, maybe this was the reason)

niklas

HoHun · « **Reply #88 on:** June 02, 2004, 04:18:48 PM »

Hi Niklas,

>Anyway, next to some nice informations about the Jumo, especially the AG version

This document is really astonishing since it answers a lot of questions that were still open with regard to the Fw 190D-9 :-)

For example the overheating discussion we had on this board last year: The Triebwerkskarte states clearly that with MW50, 2100 PS are available for 10 min with a cool-down period of 5 min between two emergency power uses. The MW50 tank gives up to 40 min of operation with MW50 injection. If it's run dry, that will kill the engine by overheating :-)

Note that 2240 PS aren't mentioned - it seems supercharger low gear wasn't available at Sondernotleistung.

Regards,

Henning (HoHun)

GScholz · « **Reply #89 on:** June 02, 2004, 08:42:14 PM »

Good catch! It must be the 398mph on the deck Sonder Notleistung mit A Lader als Bodenmotor WEP that has the 2240PS rating. That means that my calculations for the SL-250 meters fuel consumption is wrong since it was calculated for 2240PS rather than 1900.

I wish we had that power egg of an engine, unfortunately it is unclear how many Doras had this configuration.