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Info EDUARD 11/2023, Page 5
Info EDUARD 11/2023, WUNDERSCHÖNE NEUE MASCHINEN
Messerschmitt Bf 109 G-2 & G-4
Vladimír Šulc
After the successful operational use of the
Bf 109 F-2 and F-4, powered by the updated DB
601N and DB 601E engines in 1941 and 1942, further
development of the Bf 109 was based around the
new DB 605A engine, a fuel injected inverted V-12
developed from the DB 601E. The designers most
significantly increased its displacement from
33.9 l to 35.7 l by raising the cylinder bore by
4 mm. The compression ratio of the DB 605A
was 7.3:1 for the left cylinder bank and 7.5:1 for
the right, compared to 7:1/7.2:1 on the DB 601E.
The highest boost pressure for both engines
was the same, 1.42 atm for takeoff and emer-
gency modes, but thanks to the modernization
of the compressor, the speed of which was now
automatically controlled by a hydro-mechan-
ical clutch governed by barometric pressure
at different altitudes, it was possible to maintain
a constant boost pressure at different heights.
This meant that the boost pressure did not drop
with increasing altitude. All this, along with
a change in the valve timing and other modi-
fications, helped increase the maximum rpm
from 2,700 to 2,800 at takeoff. Maximum power
at takeoff rose to 1,454 hp compared to 1,331 hp
for the DB 601E. Combat power at 18,700ft was
Photo above: Bf 109 G-2 W.No. 14246. The machine has the
smaller landing gear wheels (650x150), with retractable
smaller tail wheel (290x110) and no bulges above the under-
carriage wheel well on the upper surface of the wing. [SDASM]
Bf 109 G-2
Bf 109 G-4
1,232hp, with emergency boost at the same al-
titude rated at 1,336hp, compared to 1,183hp
in combat and 1,300hp emergency at 15,750ft for
the DB 601E.
These changes led not only to an increase
in performance, but also to a slight increase
in weight from 700 to 756kg. The engine used 87
octane B4 aviation fuel and drove a Type 9-12087
propeller with wider blades. Due to the need for
more efficient cooling of the more powerful en-
gine, a larger Type 9-6150 (Fö 870) oil cooler, the
same as that installed in the Bf 109 F-4/Z, was
used. Interestingly, neither the Bf 109 G-2 nor
the G-4 are documented as using the GM-1 and
MW-50 booster systems, which were used on
both the Bf 109F and the later Bf 109 G-6.
The first production version of the Bf 109 G-2,
manufactured from May, 1942 initially at WNF and
then also at Messerschmitt in Regensburg and
at ERLA in Leipzig from June, was visually very
similar to the Bf 109 F-4, but in fact introduced
a number of changes. First of all, the fuselage
structure was strengthened, especially in the
area of the engine bulkhead and in the rear part
of the aircraft between the 8th and 9th fuselage
bulkheads, where the need for strengthening
was evident already in the Bf 109 F-4. There were
changes in the cockpit, the bulkhead between the
cockpit and the space for the MG 17 machine guns
was redesigned and strengthened. While the
Bf 109F had a zippered canvas separator between
the instrument panel and the fuselage machine
gun compartment, the Bf 109 G-2 and subse-
quent versions of the 109G had this partition
made from an aluminum casting, which better
sealed the cockpit from exhaust gases from the
engine compartment and fumes from when the
guns were fired, which was one of the persistent
problems throughout the development of the
Bf 109. On the sides of this partition were air-
tight openings that could open and closed giving
access to the MG 17 machine gun breeches and,
if necessary, manually cock them. In the middle
of the bulkhead were two sealed passages for
the shaft of the propeller adjustment mechanism
and for the mechanical tachometer. The main
fuselage tank was modified to hold 400 liters of
fuel and had armor plating composed of several
layers of aluminum sheet and was covered with
a three-layer rubber coating, which could seal
punctures from rounds of up to 12.7mm caliber.
The tank filler neck moved from under the left side
of the canopy to between the second and third
fuselage bulkhead. Optically and structurally, the
canopy underwent significant changes, which re-
sulted in the characteristic robust framing with
an integrated armored glass panel at the front.
The front plate of the windscreen was equipped
with fuel spray. Spraying was started by a cock
on the instrument panel which could only be
opened in flight. The wing structure including the
landing gear was strengthened, the tail wheel re-
mained retractable with a tire size of 290 x110mm.
The main landing gear of the G-2 retained the
wheels with tire dimensions of 650 x150mm, the
same as those of the Bf 109 F-4.
A significant change was the standardiza-
tion of fasteners for the mounting of weapons
and equipment on the airframe, which facili-
tated the later modernization of the aircraft to
higher versions with the help of modernization
kits (Rüstsatzen). This design strategy was re-
tained for all G-version sub types from the G-2
to the G-10, and allowed the airframes of older
machines to be suitable candidates for conver-
HISTORY
INFO Eduard6
November 2023
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Info EDUARD 11/2023, WUNDERSCHÖNE NEUE MASCHINEN

WUNDERSCHÖNE NEUE MASCHINEN

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Info EDUARD 11/2023, Shows

Shows

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