Me 109 G Nr. 109 06 L 43

Messerschmitt AG.
Augsburg

Influence of the engine cowling
shape on the speed of the ME 109 G

Test Report
Nr. 109 06 L 43
Date 22.4.43
Copy

Dept. Flight Testing
Group Performance

Reason:	The mounting of 2 MG 131 in the fuselage over the engine necessitates the attachment of double bumps (see Abb.), due to space considerations, as the standard production cowling of the Me 109 G with DB 605. For reduction of the additional drag caused by these bumps, an enlarged, smoothly faired engine cowling was made.
	Flight tests were made to determine the influence of 3 different cowling styles on the level speed of the Me 109 G.

Test
Procedure:

Test flights using combat power were conducted with each of the cowling designs; the speeds obtained were converted to sea level and normal temperature.

Results:	1.	Standard production 109 G – engine cowling: V_no = 306 mph (492 km/h)
	2.	Standard production 109 G – engine cowling with double bumps for MG 131: V_no = 300 mph (483 km/h)
	3.	SEnlarged, faired engine cowling V_no = 304 mph (489 km/h)

Aircraft:

109 G – 6 Trop. Werk.Nr. 16476 SL + EM

Propeller:

3-fl VDM – 9-12087a Verstellschraube Werk Nr. 312.8306

Weight:

Ready for take-off ~ 6834 lbs (3100 kg)

Condition of the aircraft:

Production 109 G with tropical equipment (sand filter at the intake), single-wire antenna, under-wing armament, outside air thermometer on the left wing, radiator flap indicator, main-wheel covers with indicator, non retractable tail wheel, normal camouflage finish, 2 ETC 50 under the fuselage arranged one behind the other.

Date of
Test flights:

20.4 u. 22.4.43

Pilot:

Schmid, Lukas

Completion
of the Test:

Test flight with combat power n=2600 U/min; p=1,3 ata radiator flaps completely closed. No weapons were installed in the fuselage during the test fights

Messerschmitt AG. Flugerprobung. Gruppe: Leistungen Bearbeiter: Wanner

Einfluss der Form der Motorhaube auf die Geschwindigkeit der Me 109 G (pdf)