The Sukhoi Su-25 (NATO reporting name: Frogfoot) is a single-seat, twin-engine jet aircraft developed in the Soviet Union by the Sukhoi Design Bureau. It was designed to provide close air support for the Soviet Ground Forces. The first prototype made its maiden flight on 22 February 1975. After testing, the aircraft went into series production in 1978 at Tbilisi in the Soviet Republic of Georgia. Russian air and ground forces nicknamed it "Grach" ("Rook").

Early variants included the Su-25UB two-seat trainer, the Su-25BM for target-towing, and the Su-25K for export customers. Upgraded variants developed by Sukhoi include the Su-25T and the further improved Su-25TM (also known as Su-39). By year 2007, the Su-25 is the only armoured airplane still in production except the Su-34 whose production just started. It is currently in service with Russia and various other CIS states as well as export customers.

During its more than twenty-five years in service, the Su-25 has seen combat with several air forces. It was heavily involved in the Soviet war in Afghanistan, flying counter-insurgency missions against the Mujahideen. The Iraqi Air Force employed Su-25s against Iran during the 1980–89 Iran–Iraq War. Most of them were later destroyed or fled to Iran in the 1991 Persian Gulf War. In 1993, Abkhazian separatists used Su-25s against Georgians during the Abkhazian War. Eight years later, the Macedonian Air Force employed Su-25s against Albanian insurgents in the 2001 Macedonia conflict, and in 2008, Georgia and Russia reportedly used Su-25s in the South Ossetian conflict.

In early 1968, the Soviet Ministry of Defence decided to develop a specialised shturmovik armoured assault aircraft in order to provide close air support for the Soviet Ground Forces. The idea of creating a ground-support aircraft came about after analysing the experience of shturmovaya (attack) aviation during World War II, and in local wars during the 1950s and 1960s.[4] The Soviet fighter-bombers in service or under development at this time (Su-7, Su-17, MiG-21 and MiG-23) did not meet the requirements for close air support of the army.[4] They lacked essential armour plating to protect the pilot and vital equipment from ground fire and missile hits, and their high flight speeds made it difficult for the pilot to maintain visual contact with a target. Having taken into account these problems, Pavel Sukhoi and a group of leading specialists in the Sukhoi Design Bureau started preliminary design work in a comparatively short period of time, with the assistance of leading institutes of the Ministry of the Aviation Industry and the Ministry of Defence

In March 1969, a competition was announced by the Soviet Air Force that called for designs for a new battlefield close-support aircraft. Participants in the competition were the Sukhoi Design Bureau and the Design Bureaus of Yakovlev, Ilyushin and Mikoyan. Sukhoi finalised its "T-8" design in late 1968, and began in work on the first two prototypes (T8-1 and T8-2) in January 1972. The T8-1, the first airframe to be assembled, was completed just before a major national holiday on 9 May 1974. However, it did not make its first flight until 22 February 1975, after a long series of test flights by Vladimir Ilyushin. The Su-25 surpassed its main competitor in the Soviet Air Force competition, the Ilyushin Il-102, and series production was announced by the Ministry of Defence.

During flight-testing phases of the T8-1 and T8-2 prototypes' development, the Sukhoi Design Bureau's management proposed that the series production of the Su-25 should start at Factory No. 31 in Tbilisi, Soviet Republic of Georgia, which at that time was the major manufacturing base for the MiG-21UM "Mongol-B" trainer. After negotiations and completion of all stages of the state trials, the Soviet Ministry of Aircraft Production authorised manufacture of the Su-25 at Tbilisi, allowing series production to start in 1978.

In the late 1980s and early 1990s, several Su-25 variants appeared, including modernised versions, and variants for specialised roles. The most significant designs were the Su-25UB dual-seat trainer, the Su-25BM target-towing variant, and the Su-25T for antitank missions. In addition, an Su-25KM prototype was developed by Georgia in co-operation with Israeli company Elbit Systems in 2001, but so far this variant has not achieved much commercial success. The Su-25 is the only armoured airplane still in production in 2007.

The Russian Air Force operates the largest number of Su-25s, and has plans to upgrade older aircraft to the Su-25SM variant. However, this process has been slowed due to a funding shortfall, by early 2007 only seven aircraft had been modified.

General characteristics

   * Crew: one pilot
   * Length: 15.33 m (50 ft 11)
   * Wingspan: 14.36 m (47 ft 1 in)
   * Height: 4.80 m (15 ft 9 in)
   * Wing area: 30.1 m² (324 ft²)
   * Empty weight: 10,740 kg (23,677 lb)
   * Loaded weight: 16,990 kg (37,456 lb)
   * Max takeoff weight: 20,500 kg (45,194 lb)
   * Powerplant: 2× Tumansky R-195 turbojets, 44.18 kN (9,480 lbf) each

Performance

   * Maximum speed: 950 km/h (590 mph, Mach 0.82)
   * Combat radius: 375 km (235 mi)
   * Ferry range: 2,500 km (1,553 mi)
   * Service ceiling: 10,000 m (22,200 ft)
   * Rate of climb: 58 m/s (11,400 ft/min)
   * Wing loading: 584 kg/m² (119 lb/ft²)
   * Thrust/weight: 0.51

Armament

   * 1 × GSh-30-2 30mm cannon with 250 rounds