Technical data
Type La-5FN
Function Fighter Prototype Series Fighter
Year 1943
Crew 1
Engine ASh-82FN
Takeoff Power 1850hp
Power at 1550m 1630hp
Power at 4500m 1500hp
Length 8.60m
Height ?m
Wingspan 9.80m
Wing area 17.50m2
Empty weight 2706kg 2828kg
Loaded weight 3168kg 3290kg
Wing Load (kg/m2) 181 188
Power load (kg/hp) 2.17 2.25
Speed at altitude
0m (boosted) 593km/h 583km/h
6250m 648km/h 634km/h
Landing 137km/h 138km/h
Landing Roll ?m ?m
Takeoff Roll ?m ?m
Turn time 18.5sec 18.5sec
Range ?km ?km
Flight Endurance ?h ?h
Ceiling 11200m 10750m
Climb
5000m 4.7min 5.2min
Payload
Fuel+Oil 345+50kg
Armament
Guns 2*20mm ShVAK
Bombs 4*50kg

La-5FN and LA-5FN-TK, S.A.Lavochkin

38k La-5FN from the Le Lavochkin-5
(Hors serie du "Fana de l'aviation" n°6, Enzyklopädie der Flugzeuge, Le grand livre des avions de legende;

During offensive stage of the Battle for Stalingrad new Lavochkin aircraft made its debut. In Summer 1943 the La-5FN in substantial numbers, making massive show during the Kursk Bend battle. While the La-5 was even with most of German front line fighters at low/medium altitudes, it still had some shortage in climb. With new 'Lavochkin' arrival this gap was filled.

Externally La-5FN differed from the late production La-5 by more articulated air intake on the top of the engine cowling, providing more room (and more air) demanded by new ASh-82FN supercharged engine with direct fuel injection. Fairings on the cooling/exhaust side louvers were removed. Slightly larger new VISh-105V (3m diameter) propeller was installed.

47k b/w photo of Soviet Navy aviation La-5FN, featuring racks for FAB-100 bombs;
from "Sowieckie lotnictwo MORSKIE 1941-1945" by Robert Bock, p.35

But 'hidden' changes were even more substantial. More powerful engine with better altitude performance was supplemented by airframe improvements. Those included new suction operated leading edge slats and radically improved balance of controls (following the TsAGI expertise). As a result, La-5FN and later aircraft of this line became the most lightly controlled fighters of their time. In addition, large ailerons provided it with excellent roll characteristics.

Improvements in wing structure allowed to use larger fuel tanks, but this opportunity was realised only on few batches. Commonly, tanks volume as same or even smaller than on the La-5.

La-5 pilots complains about excessive cockpit heat were taken into account, and La-5FN provided sufficient comfort. Spartan cockpit instrumentation was absolutely sufficient for daylight prop fighter.

In effort to improve high altitude performance of the La-5FN small batch of La-5FN-TK was built. Those fighters were equipped with turbo-chargers designed by Treskin. Quite commonly, marginal high altitude advantages were outweighted by performance losses at low and medium altitudes - where 'Lavochkins' were mostly used. High altitude fighter on Eastern front was not a pressing priority, and this project was abandoned.


Drawing from Watson's Military, used to produce a background for this page;

PredecessorsModifications

La-5

La-7
LA-5FN-TK

La-5 '206'
VI
ReferencesLinks
  • "History of aircraft construction in the USSR", Vol.2 p.220...221;
  • "Russian aircraft since 1940" by Jean Alexander, p.171...172;
  • "Russian Civil and Military aircraft 1884~1969" by Heinz J.Nowarra and G.R.Duval, p.138...139;
  • La-5FN
  • La-5, French site;
  • La-5FN at
  • Michael Fletcher's Site;
  • La-5, Lavochkin
  • Of course, La-5 at World War II Fighters;
  • La-5 at Virtual Aircraft Museum
  • La-5FN model page by Dariusz Tyminski
  • DOO Flightsimulator page by Oleg Devjatkin;
  • Soviet Warbirds
  • More on La-5 modeling
  • Modeling "ADVENTURES IN LAVOCHKINLAND"
  • Vitaly Popkov's Lavochkin La-5FN and friends
  • Nice 1/72 from 'Zvezda'
  • not about La-5FN... but 'Lavochkin' is mentioned and material is interesting!
  • Lavochkin LA5-FN
  • Lev Shestakov & Hans-Ulrich Rudel
  • Subject: Lavochkin La-5FN
  • Created January 25, 1996
    Modified October 07, 1999
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