The Mikoyan-Gurevich MiG-21 (Russian: Микоян и Гуревич МиГ-21 ) (NATO reporting name " Fishbed ") is a supersonic jet fighter aircraft, designed and built by the Mikoyan-Gurevich Design Bureau in the Soviet Union. It was popularly nicknamed "balalaika", from the aircraft's planform-view resemblance to the Russian stringed musical instrument or ołówek (English: pencil ) by Polish pilots due to the shape of its fuselage. Early versions are considered second-generation jet fighters, while later versions are considered to be third-generation jet fighters. Some 50 countries over four continents have flown the MiG-21, and it still serves many nations a half-century after its maiden flight. The fighter made aviation records. At least by name, it is the most produced supersonic jet aircraft in aviation history, the most produced combat aircraft since the Korean War, and it had the longest production run of a combat aircraft (1959 to 1985 over all variants).
Development
The MiG-21 jet fighter was a continuation of Soviet jet fighters, starting with the subsonic MiG-15, MiG-17, and the supersonic MiG-19. A number of experimental Mach 2 Soviet designs were based on nose intakes with either swept-back wings, such as the Sukhoi Su-7, or tailed deltas, of which the MiG-21 would be the most successful.
Development of what would become the MiG-21 began in the early 1950s, when Mikoyan OKB finished a preliminary design study for a prototype designated Ye-1 in 1954. This project was very quickly reworked when it was determined that the planned engine was underpowered; the redesign led to the second prototype, the Ye-2. Both these and other early prototypes featured swept wings—the first prototype with delta wings as found on production variants was the Ye-4. The Ye-4 made its maiden flight on 16 June 1955 and made its first public appearance during the Soviet Aviation Day display at Moscow's Tushino Airport in July 1956. The MiG-21 was the first successful Soviet aircraft combining fighter and interceptor characteristics in a single aircraft. It was a lightweight fighter, achieving Mach 2 with a relatively low-powered afterburning turbojet, and is thus comparable to the American F-104 Starfighter and F-5 Freedom Fighter and the French Dassault Mirage III.
Like many aircraft designed as interceptors, the MiG-21 had a short range. This was not helped by a design defect where the center of gravity shifted rearwards once two-thirds of the fuel had been used. This had the effect of making the plane uncontrollable, resulting in an endurance of only 45 minutes in clean condition. The issue of the short endurance and low fuel capacity of the MiG-21F, PF, PFM, S/SM and M/MF variants—though each had a somewhat greater fuel capacity than its predecessor—led to the development of the MT and SMT variants. These had a range increase of 250 km (155 mi.) compared to the MiG-21SM, but at the cost of worsening all other performance figures (such as a lower service ceiling and slower time to altitude).
The delta wing, while excellent for a fast-climbing interceptor, meant any form of turning combat led to a rapid loss of speed. However, the light loading of the aircraft could mean that a climb rate of 235 m/s (46,250 ft/min) was possible with a combat-loaded MiG-21bis, not far short of the performance of the later F-16A. Given a skilled pilot and capable missiles, it could give a good account of itself against contemporary fighters. It was replaced by the newer variable-geometry MiG-23 and MiG-27 for ground support duties. However, not until the MiG-29 would the Soviet Union ultimately replace the MiG-21 as a maneuvering dogfighter to counter new American air superiority types.
The MiG-21 was exported widely and continues to be used. The aircraft's simple controls, engine, weapons, and avionics were typical of Soviet-era military designs. The use of a tail with the delta wing aids stability and control at the extremes of the flight envelope, enhancing safety for lower-skilled pilots; this in turn enhanced its marketability in exports to third world countries with limited training programs and restricted pilot pools. While technologically inferior to the more advanced fighters it often faced, low production and maintenance costs made it a favorite of nations buying Eastern Bloc military hardware. Several Russian, Israeli and Romanian firms have begun to offer upgrade packages to MiG-21 operators, designed to bring the aircraft up to a modern standard, with greatly upgraded avionics and armaments.
Due to the lack of available information, early details of the MiG-21 were often confused with those of the similar Sukhoi fighters also under development. Jane's All the World's Aircraft 1960-1961 describes the "Fishbed" as a Sukhoi design, and uses an illustration of the Su-9 'Fishpot'.
Production
A total of 10,645 units were built in the USSR. They were produced in three factories, in the GAZ 30 in Moscow (also known as Znamya Truda), in GAZ 21 in Gorky and in GAZ 31 in Tbilisi. The type of "MiG" manufactured differed. Gorky built single-seaters for the Soviet forces. Moscow built single-seaters for export and Tbilisi manufactured the twin-seaters both for export and for the USSR. However, there are exceptions. The MiG-21R and MiG-21bis for export and for the USSR were built in Gorky, 17 single-seaters were built in Tbilisi (MiG-21 and MiG-21F), the MiG-21MF was first built in Moscow and then Gorky, and the MiG-21U was built in Moscow as well as in Tbilisi. The count for each factory is:
- 5,765 in Gorky
- 83 MiG-21F; 513 MiG-21F-13; 525 MiG-21PF; 233 MiG-21PFL; 944 MiG-21PFS/PFM; 448 MiG-21R; 145 MiG-21S/SN; 349 MiG-21SM; 281 MiG-21SMT; 2013 MiG-21bis; 231 MiG-21MF
- 3,203 in Moscow
- MiG-21U (all export units); MiG-21PF (all export units); MiG-21FL (all units not built by HAL); MiG-21M (all); 15 MiG-21MT (all)
- 1,678 in Tbilisi
- 17 MiG-21 and MiG-21F; 181 MiG-21U izdeliye 66-400 and 66-600 (1962–1966); 347 MiG-21US (1966–1970); 1133 MiG-21UM (1971 to end)
A total of 194 MiG-21F-13s were built under licence in Czechoslovakia, and Hindustan Aeronautics Ltd. of India built 657 MiG-21FL, MiG-21M and MiG-21bis (of which 225 were bis)
Technical description
The MiG-21 is a single-engined jet fighter aircraft capable of supersonic flight.
The MiG-21 has a delta wing. The sweep angle on the leading edge is 57° with a TsAGI S-12 airfoil. The angle of incidence is 0° while the dihedral angle is -2°. On the trailing edge there are ailerons with an area of 1.18 m², and flaps with an area of 1.87 m². In front of the ailerons there are small wing fences.
A semi-monocoque with an elliptical profile with a maximum width of 1.24 m. The air flow to the engine is regulated by a cone in the air intake. Up until the MiG-21PF it is three staged. On speeds up to M=1.5 it is fully retracted, between speeds of M=1.5 and M=1.9 it is in the middle position, and with speeds higher than M=1.9 it is in the maximum forward position. However, on the MiG-21PF it adapts to the actual speed, according to the UVD-2M system aboard the aircraft, which monitors the pressure in front and behind the compressor of the engine. On both side of the nose there are gills to supply the engine with more air while on the ground and during takeoff. In the first variant of the MiG-21, the pitot tube is on the bottom of the nose; after the MiG-21P, every version of the -21 has this tube situated on the top of the air intake.
The cabin is pressurized and air conditioned. The canopy up until the MiG-21PFM opens on a hinge on the front of the canopy. When ejecting, the SK-1 ejection seat connects with the canopy making a capsule to enclose the pilot and protect him from the airflow, after which it would separate and the pilot would parachute down. However, the canopy took too long to separate and some pilots were killed after ejecting at low altitudes. On the MiG-21PFM the canopy opens on a hinge on the right side of the cockpit.
On the belly of the plane there are three air brakes, two at the front and one at the back. The front brakes have an area of 0.76 m², and a deflection angle of 35°. The back one has an area of 0.46 m² and a deflection angle of 40°. The usage of the back air brake is blocked if the plane carries an external fuel tank. Behind the air brakes are the bays for the main landing gear. Under the body, just behind the trailing edge of the wing, two JATO rockets can be attached. The front part of the fuselage ends with former #28. Beginning with former #28a is the back part of the fuselage, which is removable for engine maintenance.
The empennage of the MiG-21 consists of a vertical stabilizer, a stabilator and a small fin on the bottom of the tail to improve yaw control. The vertical stabilizer has a sweep angle of 60° and an area of 5.32 m² (
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