Opinions on the FW-190 D-9?

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gabriel pagliarani
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Post by gabriel pagliarani » 21 Sep 2003 09:20

Scott Smith wrote:......On the other hand, the Bf 109 was not so great at medium altitudes because its turbocharger had not really kicked-in yet. The Merlin engine avoided this problem because it had a dual speed turbocharger or something like that. Perhaps somebody knowledgeable in this area can explain it in more detail.
:)

A double stage volumetric bi-lobal compressor for Merlins (R&R or Packard). Basically a twin compressor on the same shaft: when the external air pressure was lower than an X% or the throttle was opened more than a Y% the second stage doubled the moles of air injected to the carburetor. The 1st Spitfire having this device was the Mark VIII (pressurized cockpit! ) defending Scapa Flow RN base during 1943 from Orkades. Finest mechanical design, a real jewel...

Hop
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Post by Hop » 21 Sep 2003 23:16

The first Spitfire with a two stage supercharger was the Spitfire IX, which went in to squadron service in June or July 1942. The Spit VIII was supposed to be the first, but the Spit IX was created as a temporary expedient to get the two stage engine in to service as quickly as possible. The IX was basically a Spit V modified to take the new engine

The two stages of the supercharger ran all the time. The two stage Merlins were two stage, two speed engines. The two stages worked constantly, but they shifted between high and low gear for the supercharger depending on altitude. (The high gear was called FS, low gear MS in British service)

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Erich
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Post by Erich » 22 Sep 2003 20:46

back on topic, anyone have the line-up of JG's that had the Dora 9 on hand during 1945.... ?

III./JG 54 the first gruppe so equipped, with the intent to provide high cover for Kommando Nowotny's Me 262's

~E

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Erich
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Dora units in spring of 45........

Post by Erich » 23 Sep 2003 01:12

ok, from what I scoured through a data base of mine.

March 45,

JG 2 outfitted
IV./JG 3 stab and one staffel equipped
stab/JG 4 and there was talk of some a/c in the old II. Sturm/JG 4
JG 26 outfitted
JV 44 in the Würger staffel
IV./JG 51 in the stab
7-8 in possibly II./JG 300 or in the Geschwader stab
II./JG 301 outfitted in their 5-7th staffels; 8th staffel had the Fw 190A-9

~E enjoy ! 8)

gabriel pagliarani
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Post by gabriel pagliarani » 26 Sep 2003 23:09

What about Dora-12?

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Erich
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Dora's

Post by Erich » 26 Sep 2003 23:22

Gabriel :

do you mean the D-11, rote 4 in JV 44's Würger staffel or the D-13, gelbe 10 in JG 26 ? I know of no D-12 in any service unit.

~E

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cuski
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Post by cuski » 26 Sep 2003 23:26

gabriel pagliarani wrote:What about Dora-12?


The Fw 190D-12 was a fighter-bomber variant, which differed from the D-9 by having a three-stage supercharged Jumo 213F-1 engine rated at 2060 hp for takeoff mounted in a new, more extensively armored cowling. Armanent was one engine-mounted 30-mm MK 108 cannon and two 20-mm MG 151s in the wing roots. Although it was mainly a ground-attack plane, the D-12 it proved also an effective fighter and could attain 453 mph at 37,000 feet when MW 50 boost was used.

Not many were delivered.

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Erich
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Post by Erich » 26 Sep 2003 23:38

never heard of any delivered. Not even sure about the Dora that Rudel flew either except it was bomb equipped while in SG 2.

~E

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cuski
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Post by cuski » 26 Sep 2003 23:56

Erich wrote:never heard of any delivered. Not even sure about the Dora that Rudel flew either except it was bomb equipped while in SG 2.
~E


Rudel's Dora was a 9.

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