Me 109 G-5 Nr. 109 15 L 43

Messerschmitt AG.
Augsburg

Drag of 160 liter external tank,
without fairing, beneath the fuselage.

Test Report
Nr. 109 15 L 43
Date 15.8.43
Copy 3

Dept. Flight Testing
Group Performance

Reason:	FS.RLM Nr. 01238 from 30.7.43
	Since the 300 liter tanks are generally not utilized, Colonel Galland suggests drag should be decreased by using a smaller tank.

Test
Procedure:

Test flights with three different conditions.

Results:

The following values are not converted, since air conditions did not change during the test.

Condition	V mph	V/mph
smooth machine	327	0
Mounting bracket without tank	324	- 3
Mounting Bracket with 160 l-Tank	308	-19

	B = 729 mm Hg, t = + 14 °, y = 1,179 kg/m³,
	p₄= 1,30 ata, p₂ = 1,72 ata.

Tests with an un-faired 300 liter external tank on a Me 109 E/3 (vgl Test Report from 30.7.40) resulted, after conversion to an Me 109 G, in a speed loss of 31 km/h. This calculation is still confirmed by a test. A decrease in size of the tank thus brought no speed gain. A fairing is in the works. A significant improvement is anticipated from this measure.

Aircraft:

Me 109-G/5 CN + WF
W. Nr. 15562

Engine:

DB 605 A W.Nr. 37648

Propeller:

3-fl. VDM adjustable propeller D = 3,0 m
Blattbaumuster 9 – 12087

Condition
of the
machine:

Standard production 109 G with smooth camouflage finish, single-wire antenna, tail wheel out, radiator flaps closed.

Augsburg, den 16.8.43
FEV/We/Ka.

Messerschmitt AG. Flugerprobung. Gruppe: Leistungen Bearbeiter: Wegener

Speed was 314 mph (506 km/h ) at sea level after corrections and adjustment to condition of basic model Me 109 G.

Zusammenstellung aller Leistungmessungen umgerechnet auf Grundausführung from 14.1.44