| Messerschmitt
AG. Augsburg |
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 Leistungen |
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Introduction :
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 influence
of the 3 different cowling designs on the level speed of
the Me 109 G.
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 influence
of the 3 different cowling designs on the level speed of
the Me 109 G.
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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).
Results : 1. Serial production 109 G – engine cowling :
Vno = 492 km/h
2. Serial production 109 G – engine cowling with bulges
for MG 131 on both sides :
Vno = 483 km/h
Vno = 489 km/h
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).
Results : 1. Serial production 109 G – engine cowling :
Vno = 492 km/h
2. Serial production 109 G – engine cowling with bulges
for MG 131 on both sides :
Vno = 483 km/h
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3. Enlarged, streamlined engine cowling
: Vno = 489 km/h
Aircraft :
109 G – 6 Trop. Werk.Nr. 16
476 SL + EM
Propeller : 3-bladed VDM – 9-12087a variable-pitch propeller Werk Nr. 312.8306
Weight : Ready for take-off : ~ 3100 kg.
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.
Flight: 20 April and 22 April 1943.
Pilot: Schmid, Lukas.
the measurements: Test run with Kampfleistung1 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 recording devices.
Propeller : 3-bladed VDM – 9-12087a variable-pitch propeller Werk Nr. 312.8306
Weight : Ready for take-off : ~ 3100 kg.
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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.
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Day of Flight: 20 April and 22 April 1943.
Pilot: Schmid, Lukas.
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Execution
of the measurements: Test run with Kampfleistung1 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 recording devices.
Notes :
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).
Last updated 18 November 2006.
Work in progress.
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email at : kurfurst@atw.hu
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