Influence of the shape the engine cowling
on the level speed of the
Me 109 G
Versuchs-Bericht Nr. 109 06 L
43 Datum : 22.4.43 Ausfertigung :
Abt. Flugerprobung Gruppe
The installation of two MG 131 in the cowling above the engine
resulted in adding bulges
due to space issues onto both sides of
the serial production cowling of the
Me 109 G with DB 605 (see
pictures). To reduce the
additional drag resistance from these
bulges, an enlarged,smoothly
streamlined cowling was produced.
The flight measurements serve to determine the
of the 3 different cowling designs on the level
the Me 109 G.
Execution of the tests :
With each cowling design a test run was performed using Kampfleistung1;
The tested speeds were corrected for 0
m altitude and
Standard Temperature (Normaltemperatur).
1. Serial production 109 G – engine
Vno = 492 km/h
2. Serial production 109 G – engine
cowling with bulges
for MG 131 on both
Vno = 483
3. Enlarged, streamlined engine cowling
Vno = 489 km/h
109 G – 6 Trop. Werk.Nr. 16
476 SL + EM
3-bladed VDM – 9-12087a variable-pitch propeller Werk Nr. 312.8306
Ready for take-off : ~ 3100 kg.
Condition of the Airframe :
Tropicalised (sand filter on the
air in-take), series production 109 G
with wire-antenna, underwing
gondola weapons, external air temperature
gauge on the left wing, radiator
flap position indicator, main wheel
well doors and indicators,
non-retractable tailwheel, standard camouflage
finish, 2 ETC 50 under the
fuselage one after the other, with cover plates.
Day of Flight:
20 April and 22 April 1943.
measurements: Test run
n=2600 U/min; p=1,3 ata. Radiator flaps
fully closed. During the test runs no
guns were installed in the cowling.
During the test flights altitude,
dynamic head, manifold- and supercharger
pressure were registered with
1., Kampfleistung : Steig- und Kamplfeistung, 'Climb-
and Combat Power' rating of the engine,
allowable for 30 min. 1310 PS
output at SL (1.3ata MAP and 2600 RPM).
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