Lavochkin La-5

The Lavochkin La-5 (Лавочкин Ла-5) was a Soviet fighter aircraft of World War II. It was a development and refinement of the LaGG-3 and was one of the Soviet Air Force's most capable types of warplane.

Development

The La-5's heritage began even before the outbreak of war, with the LaGG-1, a promising yet underpowered aircraft – turning a full circle, for example, took 20 seconds. The LaGG-3 was a modification of that design that attempted to correct this by both lightening the airframe and fitting a more powerful engine. Nevertheless, this was not enough, and the lack of power remained a significant problem.

In early 1942, two of the LaGG-1 and -3's designers, Semyon Lavochkin and Vladimir Gorbunov, attempted to correct this deficiency by experimentally fitting a LaGG-3 with the more powerful Shvetsov ASh-82 radial engine. Since the LaGG-3 was powered by an inline engine, they accomplished this by grafting on the nose section of a Sukhoi Su-2 (which used this engine). By now, the shortcomings of the LaGG-3 had caused Lavochkin to fall out of Stalin's favour, and factories previously assigned to LaGG-3 construction had been turned over to building the rival Yakovlev Yak-1 and Yak-7. The design work required to adapt the LaGG-3 to the new engine and still maintain the aircraft's balance was undertaken by Lavochkin in a small hut beside an airfield over the winter of 1941-1942, all completely unofficially.

When the prototype took flight in March, the result was extremely pleasing - the fighter finally had a powerplant that allowed it to perform as well in the air as it had been supposed to on paper. After flying, the LaG-5 (the change in name reflecting that one of the original LaGG designers was no longer with the programme), Air Force test pilots declared it superior to the Yak-7, and intensive flight tests began in April. After only a few weeks, the design was modified further, cutting down the rear fuselage to give the pilot better visibility.

By July, Stalin ordered maximum-rate production of the aircraft, now simply known as the La-5 and the conversion of any incomplete LaGG-3 airframes to the new configuration. While still inferior to the best German fighters at high altitudes, the La-5 proved to be every bit their match closer to the ground. With most of the air combat over the Eastern Front taking place at altitudes of under 5,000 m (16,400 ft), the La-5 was very much in its element. Rate of roll was excellent.

Further refinement of the aircraft involved a fuel-injected engine, further lightening of the aircraft, and flixed slats to improve all-round performance. This was designated the La-5FN and would become the definitive version of the aircraft. A full circle turn took 18-19 seconds - a beautiful dogfighter. Altogether, 9,920 La-5s of all variants were built, including a number of dedicated trainer versions, designated La-5UTI. Further refinements of the aircraft would lead to the Lavochkin La-7 with a reputation for the aileron turn. Some had 3 new B-20 cannon in the cowl with a salvo of 3.4 kg per second weight of fire.

Whenever a low flying attacker couldn't be intercepted even by the new Yak-9U, the La-7 would do it. The leading Allied ace of WW 2, Ivan Kozhedub (62 kills), flew this fighter when he shot down an Me 262 jet.

A number of La-5s continued in the service of Eastern Bloc nations after the end of the war, including Czechoslovakia.

Flying the La-5FN

In the summer of 1943, a brand-new La-5FN made a forced landing on a German airfield providing Luftwaffe with an opportunity to test-fly the newest Soviet fighter. Test pilot Hans-Werner Lerhe wrote a detailed report of his experience . He particularly noted that the La-5FN excelled at altitudes below 3,000 meters (9,840 ft) but suffered from short range and flight time of only 40 minutes at cruise engine power. All of the engine controls (throttle, mixture, propeller pitch, radiator and cowl flaps, and supercharger gearbox) had separate levers which served to distract the pilot during combat to make constant adjustments or risk suboptimal performance. For example, rapid acceleration required moving no less than six levers. In contrast, contemporary German aircraft had largely automatic engine controls with the pilot operating a single lever and electromechanical devices making the appropriate adjustments. Due to airflow limitations, the engine boost system (Forsazh) could not be used above 2,000 meters (6,560 ft). Stability in all axes was generally good. The authority of the ailerons was deemed exceptional but the rudder was insufficiently powerful at lower speeds. At speeds in excess of 600 km/h (370 mph), the forces on control surfaces became excessive. Horizontal turn time at 1,000 meters (3,280 ft) and maximum engine power was 25 seconds. In comparison with Luftwaffe fighters, the La-5FN was found to have a comparable top speed and acceleration at low altitude. It possessed a higher roll rate and a smaller turn radius than the Bf 109 and a better climb rate than the Fw 190A-8. Bf 109 utilizing MW 50 had superior performance at all altitudes, and Fw 190A-8 had better dive performance. Lerhe's recommendations were to attempt to draw the La-5FN to higher altitudes, to escape attacks in a dive followed by a high-speed shallow climb, and to avoid prolonged turning engagements.

Operators

Czechoslovakia, Soviet Union,

Development

Flying the La-5FN

Operators

Specifications (Lavochkin La-5FN)

References

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Gourt Home::Gourt :: Lavochkin La-5

Development

Flying the La-5FN

Operators

Specifications (Lavochkin La-5FN)

References

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