La-5 '206' fighter prototype by S.A. Lavochkin / TsAGI

General Information
Type La-5 '206'
Function Fighter prototype
Year 1943
Crew 1
Powerplant
Type Shvetsov ASh-82FN
Power at 0m 1,850hp
Power at 4,650m 1,460hp
Size
Length 8.67m
Height 2.54m
Wingspan 9.80m
Wing area 17.56m2
Weights and loads
Empty ?kg
Takeoff 3,445kg
Wing Load (kg/m2) 197
Power load (kg/hp) 2.38
Speed
at 0m 630km/h
at 6,150m 684km/h
Maneuverability
Turn time ?sec
Roll
Landing ?m
Takeoff ?m
Range
Practical ?km
Flight endurance ?h
Ceiling
Ceiling ?m
Climb
5,000m 5.2min
Payload
Fuel/Oil 345/50kg
Gun type (Position)Ammo
2*20mm ShVAK, engine cowling 200rpg
Salvo (kg/sec) 2.56
62k b/w photo of La-5 '206' from Squadron/Signal No. 169 "La-5/7 Fighters in Action" by Hans-Heiri Stapfer, p.32.

With the service introduction of the La-5FN the Soviet Air Forces for the first time had a fighter superior to the Messerschmitt Bf 109G. But it was also evident, that this advantage would not last long without further improvements to the basic design. A further significant increase of the power of the ASh-82FN engine was considered impossible by the Shvetsov team, however, and more powerful alternative engines like the ASh-71F proved too unreliable. So the only way to obtain further performance improvements lay in additional weight reductions and careful refinements of the La-5FN's aerodynamics.

32k b/w photo of La-5 '206' from "Soviet Combat Aircraft of the Second World War" by Ye.Gordon and D.Khazanov; Vol.1 p.54.

With this in mind and the promising results obtained during extensive tests of an aerodynamically improved La-5 at TsAGI's huge T-104 wind tunnel in Zhukovskij during 1943, the standard La-5FN with the serial number 39210206 (hence the designation La-5 '206') was modified by the TsAGI. The following modifications were carried out:

95k b/w drawing of La-5 '206' from Squadron/Signal No. 169 "La-5/7 Fighters in Action" by Hans-Heiri Stapfer, p.32, denoting main modifications.

Flight testing of this aircraft took place at the LII between December 16, 1943 and February 10, 1944. These tests were carried out by test pilot N. V. Adamovich and engineer V. Molochayev. The results fully confirmed the calculations and predictions made by TsAGI. Although the La-5 '206' was about 150kg heavier than the standard La-5FN, at an altitude of 6,150m it was 64km/h faster.

Another 39k b/w shot of La-5 '206' from "Soviet Combat Aircraft of the Second World War" by Ye. Gordon and D. Khazanov; Vol.1 p.54.

The TsAGI modifications and recommendations were immediately taken into account by S.A. Lavochkin. He took over the work to incorporate these (and some own) improvements into production fighters. This finally led (via the La-5FN Model 1944 prototype) to the La-7.

PredecessorsModifications

La-5FN

La-5FN (Model 1944)

References
  • "Soviet Combat Aircraft of the Second World War" by Ye. Gordon and D. Khazanov; Vol.1 p.54
  • Squadron/Signal No. 169 "La-5/7 Fighters in Action" by Hans-Heiri Stapfer; p.32
  • "History of aircraft construction
  • in the USSR" Vol.2 p.224
    Links
  • La-5 history
  • ...

  • Created for RAM November 05, 2000
    by Thomas Heinz
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