The below papers form part of a the
Rechlin state aviation test centre`s flight test results performed on a
Bf 109G-1, at the start of 1943. The Bf 109G-1`s performance figures
below are also valid for the
late-production (ie. non-retractable tailwheel) pressurized
G-3, and non-pressurized G-2 and G-4 subtypes, as they only differ in
the presence of pressurized cocpit and/or radio set.
The below figures were accepted as official
of the Bf 109G-1, and were released in an unchanged form in the Kennblatt für das Flugzeugmuster Bf
109 G-1 mit Motor DB 605A vom
type datasheet in March 1943.
The aforementioned Kennblatt notes the increased
mainwheel size 660 x 160 being present
from February 1943, and the increased tailwheel size 350 x
135 from January 1943, that resulted it being non-retractable and
causing additional drag - equivalent of
12 km/h speed loss at Sea Level as per other Mtt documents. These
changes in early 1943 were the
likely reason to perform the Rechlin trials, to establish the
the new airframe conditions. Therefore it is believed the below figures
are with non-retractable tailwheel and
bulges on the wing.
This is supported by comparison with
specifications from Datenblatt
Me 109 G-1 Ausführung with the Messerschmitt's calculated
performance figures for the serial production G-1 model,
23.5.1942, at when the retractable
tailwheel was standard. The Messerschmitt
state 537 km/h at
SL (Rechlin: 525 km/h),
and 660 km/h at 7km rated altitude (Rechlin: 650 km/h at 6,4 km). The
difference, esp. in view the SL figures, points to non-retractable
enlarged tailwheel being present on the Rechlin-tested G-1.
Soviet trials on Bf 109G-4 WNr. 19 968
tested by the NII VVS in October 1943. The aircraft had non-retractable
tailwheel and achieved 508 km/h achieved at Sea level and 650 km/h at 7
km. Another Bf 109G tested by the NII VVS, Bf 109 G-2, WNr. 14 513
, but with
retractable tailwheel, achieved 524 km/h achieved at Sea level and 666
km/h at 7 km. Soviet results agree well with the Rechlin figures,
except for Sea level, however it is a general trend on all Soviet Bf
109 trials to show sharply recurving speed curves near ground level for
some unknown reason. Bf 109 G-2 WNr.
14 783, tested in
Finnland in April 1943, achieved
km/h at SL, and 636 km/h at 6300m
altitude. Speeds achieved at altitude show a marked drop-off on this
plane. Aircraft had non-retractable tailwheel. All abovementioned
performance trials were performed using Steig- und Kampfleistung 30-min
power (ie. 1.3ata, 2600 revs/min).
Leistung Fw 190
(Versuchs-Bericht Fr.M.01 L 43), dated 29.6.43
and prepeared by
Messerschmitt A.G. Augsburg, in June 1943, comparing the
performance of the FW 190A-5 to that of the Bf 109G-1, notes that
results of 13 measurements on serial production planes at Regensburg
('Messerschmitt Regensburg') and Wiener-Neustadt ('W.N.F.') Bf 109
underline Rechlin's data :
Regensburg und der Wiener-Neustadt (ca. 13 Messungen) erhärten die
sodaß diese als maßgebend anzusehen sind.
Lediglich weicht die VDH (Mittelwert 6700m) der 13 Messungen von dem
Rechliner Wert ab.'
Translated to English :
from Regensburg and from
Wiener-Neustadt (ca. 13 measurements) confirm the Rechlin values,
therefore these are to be to regarded as representative. Only the FTH
of the 13
measurements (average : 6700m) deviates from the Rechliner values.'
factory trials at the Erla factory further confirm the figures
Geschwindigkeiten der Erla Maschinenwerke, April 1943). The
avarage value of the 13 tested
fighters showed 652 km/h at 6,7 km, excluding three machines that would
be rejected by BAL for not meeting minimum acceptance specs (with
inclusion of those 643 km/h).