The Jian-7 (J-7, or F-7 in its export name) is a Chinese copy of the Soviet Union/Russian Mikoyan-Gurevich MiG-21 (NATO codename: Fishbed) supersonic jet fighter aircraft. Over 1,000 examples in different variants have been built by three aircraft manufacturers in Shenyang, Chengdu, and Guizhou since the production first began in the late 1970s. As well as serving with the PLA, the J-7 was also exported to Albania, Bangladesh, Burma, Egypt, Iran, Iraq, North Korea, Pakistan, Sri Lanka, Sudan, Tanzania, and Zimbabwe. The J-7 is still in production today and serves in the air forces of several countries, mostly as an interceptor fighter.
Early variants of the J-7 produced by Shenyang and Chengdu were all direct copies of the MiG-21F-13 (Fishbed-C), a short-range day-light interceptor fighter with very primitive avionics. During the honeymoon period of the China-West relation in the 1980s, Chengdu was able to upgrade its J-7 design with some Western avionic technologies. China also reverse engineered the more sophisticated MiG-21MF (Fishbed-J) all-weather fighter in the J-7C and J-7D variants but their designs were not entirely successful. In the early 1990s Chengdu introduced the redesigned J-7E featuring unique ‘double-delta’ wings and improved avionics. Additionally, Guizhou also built the fighter-trainer variant JJ-7, which was a copy of the MiG-21U (Mongol-A).
The MiG-21/J-7 was designed as an interceptor fighter with secondary capability for ground attack. The aircraft’s simple controls, engine, weapons, and avionics were typical of Soviet-era military designs. The fighter has a small sized airframe with a rugged and powerful engine inside. With its delta wings the aircraft has an excellent fast-climbing performance, but any form of turning combat would led to rapid loss of speed. The pilot is buried deeply in the cockpit and has a poor cockpit visibility. The aircraft has a short range, and can only take IR-homing short-range air-to-air missiles for visual range combat, making it only suitable for point air defence.
On later variants such as J-7E (F-7MG) and J-7G, Chengdu was able to improve the external finishing of the aircraft by using modern computer-aided design/computer-aided manufacturing (CAD/CAM) technologies. Aerodynamic performance was also improved due to the introduction of the “double-delta” wing design and the WP-13 turbojet engine. However, not much can be done to improve the aircraft’s incapable avionics because the limited room inside the air inlet nosecone makes it very difficult to be fitted with a capable modern fire-control radar.
Although the J-7 is generally regarded as obsolete, Chengdu continued to introduce new models to satisfy both domestic and international demands for a low-cost fighter solution. The latest J-7G variant, which first flew in 2002, entered the PLA service in 2003, which will extend the lifespan of this forty-year-old fighter design into the next decade.
