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  • Lavochkin La-7 Fighter

    The Lavochkin La-7 prop-powered fighter appeared as an improved La-5 in the later years of World War 2.

     Updated: 8/21/2015; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

    The Lavochkin La-7 was an improved variant of the preceding La-5 form. It incorporated a new Shvetsov engine, uprated to increased the mount's maximum speed though, on the whole, it remained largely the same aircraft with a new designation. Other subtle changes were incorporated based on combat actions with the La-7 and first flight of a modified prototype was in February of 1944. Service entry then followed rather quickly in September of 1944. The La-7 led a relatively short operational service life though, being retired during 1950 - the jet age now taking hold. Production of La-7 fighters numbered 5,753 units.

    As completed, the La-7 sported similar lines to the original La-5. The cockpit was heavily framed and situated at amidships. The mainplanes were set under and ahead of the cockpit floor. The engine was shrouded over in a rounded cowling with a large spinner capping the three-bladed propeller unit. The tail was tapered and formed the curved vertical fin which mounted mid-set tailplanes on either side. The fuselage spine was only slightly raised to degrade vision to the rear but required for the internal volume it allowed engineers. The undercarriage remained a tail-dragger arrangement with two main legs and a tailwheel - all retractable.

    Power was through a single Shvetsov ASh-82FN 14-cylinder air-cooled radial piston engine of 1,650 horsepower. This drove a three-bladed VISh-105V-4 series propeller blade assembly at front. Maximum speed reached 411 miles per hour of late-war models and ranges out to 415 miles. Service ceiling was 34,300 feet and rate-of-climb a strong 3,095 feet per minute.

    Standard armament began as 2 x 20mm ShVAK cannons with 200 rounds afforded each gun. This could be substituted with 3 x 20mm Berezin B-20 series cannons with 100 rounds per gun. As with the La-5 before it, the La-7 retained performance qualities in the low-to-medium altitude range which meant it a stable platform for the fighter-bomber role as well as a fighter. For this role, the La-7 could also be outfitted with air-to-surface rockets and up to 440lbs of conventional drop ordnance.

    Beyond the Soviet Air Force, the La-7 was only utilized by the Czechoslovakian Air Force.

    The only definitive production variant became the La-7UTI which served as a trainer model. This incorporated a second seat for the instructor at the expense of internal volume. 584 of the type were produced into 1947. Other one-off variants included the La-7TK used in testing a turbosupercharger development and the La-7R to test a rocket motor propulsion system. The La-7PVRD was similar in scope and used in testing of a pair of ramjet installations under the wings. Another one-off model became the La-7/M-71 which fitted a Shvetsov M-71 engine during 1944.

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    Lavochkin La-7 Technical Specifications

    Service Year: 1944
    Type: Fighter
    National Origin: Soviet Union
    Manufacturer(s): Lavochkin - Soviet Union
    Production Total: 5,753

    Structural (Crew Space, Dimensions and Weights)

    Operating Crew: 1
    Length: 28.22 feet (8.6 meters)
    Width: 32.15 feet (9.80 meters)
    Height: 8.33 feet (2.54 meters)

    Weight (Empty): 5,512 lb (2,500 kg)
    Weight (MTOW): 7,385 lb (3,350 kg)

    Installed Power and Standard Day Performance

    Engine(s): 1 x Shvetsov ASh-82FN 14-cylinder air-cooled radial piston engine developing 1,650 horsepower.

    Maximum Speed: 411 mph (661 kph; 357 knots)
    Maximum Range: 413 miles (665 km)
    Service Ceiling: 34,285 feet (10,450 meters; 6.49 miles)
    Rate-of-Climb: 3,095 feet-per-minute (943 m/min)

    Armament / Mission Payload

    2 x 20mm ShVAK cannons OR 3 x 20mm Berezin B-20 cannons.

    Up to 440lbs of external ordnance including rockets and conventional drop bombs.

    Global Operators / Customers

    Czechoslovakia; Soviet Union

    Model Variants (Including Prototypes)

    La-7 - Base Series Designation; definitive production form; improved La-5.

    La-7UTI - Two-seat trainer; 584 exampes

    La-7TK - Turbosupercharger testbed; single example.

    La-7R - Rocket engine testbed; single example.

    La-7PVRD - Ramjet engine testbed; single example.

    La-7/M-71 - M-71 engine testbed; single example.