Lavochkin-Gorbunov-Gudkov LaGG-3

LaGG-3
Role Fighter
Manufacturer 21 (Gorky), 31 (Taganrog/Tbilisi), 23/153 (Leningrad/Novosibirsk)
Designer V. P. Gorbunov
First flight 30 March 1940
Introduction early 1941
Primary user Soviet Union
Produced 1941-1944
Number built 6,528
Variants Lavochkin La-5
Lavochkin La-7

The Lavochkin-Gorbunov-Gudkov LaGG-3 (Лавочкин-Горбунов-Гудков ЛаГГ-3) was a Soviet fighter aircraft of World War II. It was a refinement of the earlier LaGG-1, and was one of the most modern aircraft available to the Soviet Air Force at the time of Germany's invasion in 1941.

Overweight despite its wooden construction, at one stage 12 LaGG-3s were being completed daily and 6,528 had been built when factory 31 in Tbilisi switched to Yak-3 production in 1944.[1]

Design and development

The prototype of the LaGG-3, I-301, was designed by Semyon A. Lavochkin, Vladimir P. Gorbunov and Mikhail I. Gudkov. It was designated LaGG-3 in serial production. Its airframe was almost completely made of timber, with the so-called delta-lumber (a wood-plastic composite composed of very thin, 0.35 to 0.55 mm, wood veneer and phenol formaldehyde resin, baked at high temperature and pressure) used for the crucial parts. This novel construction material had tensile strength comparable to that of non-hardened aluminum alloys and only 30% lower than that of precipitation hardened D-1A grade duralumin. It was also incombustible and completely invulnerable to rot, with service life measured in decades in adverse conditions. The full wooden wing (with plywood surfaces) was analogous to that of the Yak-1. The only difference was that the LaGG’s wings were built in two sections. The fuselage was of similar construction to the MiG-3's.[2] The LaGG-3’s armament consisted of a 1 × 20 mm ShVAK cannon, with 150 rounds, which was installed between the "V" of the cylinders of the engine and two synchronized 2 × 12.7 mm Berezin UBS machine guns with 170 rpg. Consequently, the weight of fire was 2.65 kg/s, making the LaGG-3 superior in burst mass to all contemporary Russian fighters, particularly to the MiG-3.[3] Most other Russian fighters of that era, were (and are) considered under-gunned in relation to western contemporary fighters. This is somewhat true even for the Yak-1, which had a 20 mm cannon and two 7.62 mm machine guns, but not the later versions of the Polikarpov I-16, which had two cannons and two machine guns.

Operational history

The LaGG-3 rapidly replaced the LaGG-1, although the new fighter was too heavy for its engine. In fact, Lavochkin, Gorbunov and Gudkov had originally designed their prototype for the powerful Klimov M-106 engine, but it proved to be unreliable, so they were obliged to install the relatively weak Klimov M-105P. As a result, the LaGG was slow; its top speed was just 575 km/h, while its rate of climb, at ground level, was as slow as 8.5 meters/second. The LaGG-3 proved to be somewhat hard to control as it reacted sluggishly to stick forces. In particular, it was difficult to pull out of a dive, and if the stick was pulled too hard, it tended to fall into a spin. As a consequence, sharp turns were difficult to perform.[3] A more powerful version of the engine was installed, but the improvement was small, so the only solution was to lighten the airframe. The LaGG team re-examined the design and pared down the structure as much as possible. Fixed slats were added to the wings to improve climb and maneuverability and further weight was saved by installing lighter armament (most versions used a 1 × 20 mm ShVAK cannon and a single synchronized 12.7 mm Berezin UBS machine gun). But the improvement was slight and, thus, without an alternative powerplant, when the LaGG-3 was first committed to combat in July 1941, it was completely outclassed by the Messerschmitt Bf 109.[3]

Later in 1941, the LaGG-3 appeared with new armament options, an internally balanced rudder, retractable ski landing gear for the winter, retractable tailwheel and wing pipes for drop tanks.[4] The result was still not good enough. Even with the lighter airframe and revised supercharged engine, the LaGG-3 was underpowered.

The LaGG-3 proved immensely unpopular with pilots. Some aircraft supplied to the front line were up to 40 km/h (25 mph) slower than they should have been and some were not airworthy. This happened less because of the added weight with full fuel and weapon loads in combat conditions, but specifically to the poor finishing in rushed industrial production, due to the German invasion. In combat, the LaGG-3's main advantage was its strong airframe. Although the laminated wood did not burn, it shattered when hit by high explosive rounds.

The LaGG-3 was improved during production, resulting in 66 minor variants in the 6,528 that were built. Experiments with fitting a Shvetsov M-82 radial engine to the LaGG-3 airframe finally solved the power problem, and led to the Lavochkin La-5.[5] The major LaGG-3 construction plant in Gorky switched over to the La-5 in 1942, after having completed 3,583 LaGG-3. All further LaGG-3 development and production was done by factory 31 in Taganrog as the sole LaGG-3 manufacturer.

Soviet pilots generally disliked this aircraft. Pilot Viktor M. Sinaisky recalled: "It was an unpleasant client! Preparing the LaGG-3 for flight demanded more time in comparison with other planes. All cylinders were supposed to be synchronized: God forbid you from shifting the gas distribution! We were strictly forbidden to touch the engine! But there were constant problems with water-cooled engines in winter: especially as there was no anti-freeze liquid. You couldn't keep the engine running all night long, so you had to pour hot water into the cooling system, in the morning. Furthermore, pilots didn't like flying the LaGG-3 - a heavy beast with a weak M-105 engine - but they got used to it. Even so, we had higher losses on LaGG-3 than on I-16s."[6]

Even with its limitations, some Soviet pilots managed to reach the status of ace flying the LaGG-3. G.I. Grigor'yev, from 178.IAP, was credited of at least 11 air victories plus two shared. But pictures of his LaGG-3 "Yellow 6", in November–December 1941, show 15 "stars", so his score was probably higher.[7]

Variants

Operators

 Finland
Finnish Air Force LaGG-3
 Germany
 Japan
 Soviet Union

Specifications LaGG-3 (data for LaGG-3 series 66)

LaGG-3

Data from Jane’s Fighting Aircraft of World War II[12]

General characteristics

Performance

Armament

See also

Related development
Aircraft of comparable role, configuration and era
Related lists

References

Wikimedia Commons has media related to Lavochkin LaGG-3.

Notes

  1. ↑ Wheeler 1992, p. 73.
  2. ↑ Drabkin 2007, pp. 146–147.
  3. 1 2 3 Drabkin 2007, p. 147.
  4. ↑ Gunston 1980, p. 132.
  5. ↑ Gordon 2003, p. 37.
  6. ↑ Drabkin 2007, p. 73.
  7. ↑ Morgan 1999, p. 28.
  8. ↑ Keskinen et al. 1977, pp. 74-87, 126.
  9. ↑ Mellinger et all. 2012, p.28
  10. ↑ Stapfer 1996, p. 16.
  11. ↑ Green and Swanborough 1977, p. 13.
  12. ↑ Bridgeman 1946, pp. 194–195.

Bibliography

  • Abanshin, Michael E. and Nina Gut. Fighting Lavochkin, Eagles of the East No.1. Lynnwood, WA: Aviation International, 1993. ISBN unknown.
  • Bridgeman, Leonard, ed. "The LaGG-3". Jane’s Fighting Aircraft of World War II. London: Studio, 1946. ISBN 1-85170-493-0.
  • Drabkin, Artem. The Red Air Force at War: Barbarossa & The Retreat to Moscow – Recollections of Fighter Pilots on the Eastern Front. Barnsley, South Yorkshire, UK: Pen & Sword Military, 2007. ISBN 1-84415-563-3.
  • Gordon, Yefim. Lavochkin's Piston-Engined Fighters (Red Star Volume 10). Earl Shilton, Leicester, UK: Midland Publishing Ltd., 2003. ISBN 1-85780-151-2.
  • Gordon, Yefim and Dmitri Khazanov. Soviet Combat Aircraft of the Second World War, Volume One: Single-Engined Fighters. Earl Shilton, Leicester, UK: Midland Publishing Ltd., 1998. ISBN 1-85780-083-4.
  • Gunston, Bill. Aircraft of World War two. London, Octopus Books Limited, 1980. ISBN 0-7064-1287-7.
  • Gunston, Bill. The Osprey Encyclopaedia of Russian Aircraft 1875–1995. London: Osprey, 1995. ISBN 1-85532-405-9.
  • Green, William. Warplanes of the Second World War, Volume Three: Fighters. London: Macdonald & Co. (Publishers) Ltd., 1961 (seventh impression 1973). ISBN 0-356-01447-9.
  • Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: Soviet Air Force Fighters, Part 1. London: Macdonald and Jane's Publishers Ltd., 1977. ISBN 0-354-01026-3.
  • Keskinen, Kalevi, Kari Stenman and Klaus Niska. Venäläiset Hävittäjät (Suomen Ilmavoimien Historia 7) (in Finnish with English Summary). Espoo, Finland: Tietoteos, 1977. ISBN 951-9035-25-7.
  • Kotelnikov, Vladimir, Mikhail Orlov and Nikolay Yakubovich. LaGG-3 (Wydawnictwo Militaria 249) (in Polish). Warszawa, Poland: Wydawnictwo Militaria, 2006. ISBN 83-7219-249-9.
  • Morgan, Hugh. Gli assi Sovietici della Seconda guerra mondiale(in Italian). Edizioni del Prado/Osprey Aviation, 1999. ISBN 84-8372-203-8.
  • Stapfer, Hans-Heiri. LaGG Fighters in Action (Aircraft in Action Number 163). Carrollton, Texas: Squadron/Signal Publications, Inc., 1996. ISBN 0-89747-364-7.
  • Wheeler, Barry C. The Hamlyn Guide to Military Aircraft Markings. London: Chancellor Press, 1992. ISBN 1-85152-582-3.
  • Mellinger, George LaGG & Lavochkin Aces of World War 2 (Osprey aircraft of the aces) London: Osprey Publishing 2012. ISBN 978-1841766096.
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