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OKL, GdJ-Grp. Qu-, Br. B. Nr. 1561/45 g.Kdos.
von 20. März 1945.
OKL, GdJ-Grp. Qu-, Br. B. Nr. 1561/45 g. Kdos, from 20 March 1945. The document, partially reproduced by Zobel and Mathmann, notes that four Gruppen employed on the Western Front, two from JG 27 and JG 53 each, are to increase manifold pressure to 1,98 ata (1,98 Ladedruckerhöh.).

It is quoted below, with translation provided as accurate as possible :

Mit Schreiben von 20. März 1945 wurde durch das OKL - General der Jagdflieger - Gruppe Qu. - festgelegt :
With the letter from OKL - General of Fighters - Gruppe Qu. on 20th March 1945 it was decided:


OKL, GdJ-Grp. Qu-, Br. B. Nr. 1561/45 g.Kdos.
 Luftwaffe Supreme High Command,  General of Fighters Group, Qu.-, Br. B. No. 1561/45 Confidental Orders.
Die Entwicklung im Rüststand der Tagjagdverbande stützt sich auf die im Notprogramm festgelegten Standardbaureihen und sieht vor:

Für Bf 109-Verbände    : K-4
Für FW 190-Verbända : D-9, D-12 mit Übergang auf Ta 152 H
                                        und C

Mit Anlauf und Einfließen der Ta 152 in FW 190 Gruppen wird für diese Verbände eine baureihenbedingte  Rüststandsverbesserung erzielt.

Bf 109-Entwicklung schließt im wesentlichen mit K-4 ab und führt - soweit nicht Auflösung vorgesehen - zwangsläufig zu Umrüstungen der Bf 109 Verbände auf TL. Reinrassigkeit der Geschwader wird vordringlich angestrebt, Kombinierung artgleicher Baureihen sind vorübergehend und nach Maßgabe der Fertigung in Kauf zu nehmen.

The development in the equipment status of day fighter units is based on the standard types laid down in the emergency program and anticipates :

 

for Bf 109 units    : K-4

for FW 190 units : D-9, D-12 with changeover to Ta 152 H
                              and C

 

With the arrival of the Ta 152 and it`s assignment to FW 190 Gruppen will result in an improvement in the equipment status of these units.

Bf 109 development will essentially conclude with the K-4 and will inevitably lead to the conversion of Bf 109 units - those not scheduled for disbandment - to jet fighters. Homogeneity of the Geschwader is urgent to be strived for, combination of similar types is temporary and because of the levels of production to be accepted .

Für die Verbande mit Bf 109-Austattung ergab sich dann folgende Rüststandentwicklung :

For the units equipped with Bf 109 the following developments in equipment were given :

 

OKL, Lw.-Führüngstab, Nr. 937/45 gKdos.(op) 20.03.45
No. Verband / Unit
 Seither / Present type Geht auf  / Convert to English
1. III./ JG 1 Bf 109 G-10 He 162 (April-Mai) -
2. II. / JG Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
3. III. / JG 3 Bf 109 K-4 bleibt
 no change
4. III. / JG 4 Bf 109 K-4 bleibt
 no change
5. IV. / JG 4 Bf 109 K-4 K-4 K-4
6. III. / JG 5 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
7. IV. / JG 5 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
8. III. / JG 6 Bf 109 G-14/AS K-4 nachschubmäßig K-4 as deliveries permit
9. II. / JG 11 Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
10. I. / JG 27 Bf 109 K-4 bleibt
1,98 Ladedruckerhöh.
 no change
boost increase to 1.98 ata
11. II. / JG 27 Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
12. III. / JG 27 Bf 109 G-10 bleibt
1,98 Ladedruckerhöh.
 no change
boost increase to 1.98 ata
13. I. / JG 51 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
14. III. / JG 51 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
15. IV. / JG 51 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
16. II. / JG 52 Bf 109 G-14/U4 K-4 nachschubmäßig K-4 as deliveries permit
17. III. / JG 52 Bf 109 G-14 K-4 nachschubmäßig K-4 as deliveries permit
18. II. / JG 53 Bf 109 K-4 K-4 nachschubmäßig K-4 as deliveries permit
19. III. / JG 53 Bf 109 K-4 bleibt
1,98 Ladedruckerhöh.
 no change
boost increase to 1.98 ata
20. IV. / JG 53 Bf 109 K-4 bleibt
1,98 Ladedruckerhöh.
 no change
boost increase to 1.98 ata
21. I. / JG 77 Bf 109 G-14/U4 K-4 nachschubmäßig K-4 as deliveries permit
22. II. / JG 77 Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
23. III. / JG 77 Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
24. III. / JG 300 Bf 109 G-10/R6
über K-4/R6 auf Me 262
 geplant, Termin
 planned, deadline
25. IV. / JG 300 Bf 109 G-10/R6
über K-4/R6 auf Me 262
 unbekannt
 unknown
26. I. / KG(J) 6 Bf 109 G-10/R6 K-4/R6 nachschubmäßig
 K-4/R6 as deliveries permit
27. II. / KG(J) 6 Bf 109 K-4 K-4/R6 nachschubmäßig K-4/R6 as deliveries permit
30. I. / KG(J) 27 Bf 109 G-10/R6 K-4/R6 nachschubmäßig K-4/R6 as deliveries permit
31. I. / KG(J) 55 Bf 109 G-10/R6 - -
32. II. / KG(J) 55 Bf 109 K-4 geht in Industrie-Einsatz
 to industrial defense
33. I./Ital. Jagdgr.
 Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
34. II./Ital. Jagdgr. Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit
35. III./Ital. Jagdgr. Bf 109 G-10 K-4 nachschubmäßig K-4 as deliveries permit

 
This notes in relation of I./JG 27, III./JG 27, III./JG 53, IV./JG 53 to increase the maximum boost pressures to 1,98 ata manifold pressure.

It is not known if and how many units had converted to 1,98 ata manifold before that order came, but it should be noted these units, in particular III./JG 27, III./JG 53 and IV./JG 53 were the major users of the Bf 109 K-4 in the Lufwaffe. The other units effected are not known at present, but given the abundance of photograph depicting G-10 and K-4 fighters belonging to other units, marked for C-3 fuel use - a likely sign of the DC engine at 1,98 ata - the boost increase was likely not limited to JG 27 and JG 53 alone.




Photographs of Bf 109 G-10 and K-4 using C-3 fuel.



Commander of 11./JG 53 (III. Gruppe), Lt. G. Landt, in the cocpit of his Bf 109K-4, Yellow 1, photographed at Kreuzstraße airfield, in April 1945.
The 'C-3' notice instructing the ground crew for filling the aircraft with 'C-3' grade fuel is blurry but visible on the cocpit.
Photograph via Janda-Poruba, Messerschmitt 109K, Camouflage and Markings.


Fw. K.-H. Böttner in the cocpit of an early Bf 109K-4. Note the C-3 fuel triangle to the right, above the tactical markings.
Photograph via Janda-Poruba, Messerschmitt 109K, Camouflage and Markings.



Bf 109 G-10/U4 "Rosemarie" belonging to II./JG 52, photographed at Neubiberg airfield, 8th May 1945. The aircraft formerly belonged
to II./JG 51. The pilot, Ofw. Richter of 7./JG 52 is relieved having just successfully flown to American captivity. The 100-octane fuel sign
marked on the fuselage is particularly worthy of note.
Photograph via Janda-Poruba, Messerschmitt 109G-10/U4.


The personal Bf 109G-10/U4 of Magg. Visconti, an Italian ace with 26 victories to his name. The C-3 fuel triangle is again visible. The fascist
Italian Air Force, the ANR, was supplied from aviation fuel reserves of the OKL, and the major proportion of the supplies were C-3.
Photograph via Nino Arena.





Allied Crashed Enemy Aircraft Reports of
Bf 109s fueled with C-3 fuel.

From AIR 40/192. Bf 109G. National Archieves, Kew.

Kindly supplied by:
Peter D Evans, Administrator
Luftwaffe Experten Message Board















Fl 20555 manifold pressure gauges
for Bf 109K-4.

Sources and References


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