Soko (Соко) — Yugoslav State Aircraft Manufacturer
Soko (Serbo-Croatian Cyrillic: Соко, meaning Falcon) was the principal aircraft manufacturing enterprise of the Socialist Federal Republic of Yugoslavia, headquartered in Mostar, Bosnia and Herzegovina. Founded in the early post-war period, Soko became the backbone of Yugoslav military aviation self-sufficiency — producing indigenous trainers, light attack jets, and licensed helicopters that served the Yugoslav Air Force (Jugoslavensko Ratno Vazduhoplovstvo — JRV) and were exported to several nations.
Operating under the Yugoslav policy of non-alignment and military independence from both NATO and the Warsaw Pact, Soko developed a remarkable range of aircraft that reflected both Western and Eastern design influences. The company's products ranged from piston-engine trainers of the 1950s to sophisticated twin-jet attack aircraft of the 1970s and 1980s, including the joint Yugoslav–Romanian J-22 Orao programme — one of the most ambitious indigenous combat aircraft projects in the non-aligned world.
Aircraft Produced by Soko
| Model | First Flight | Number Built | Type |
|---|---|---|---|
| Soko 522 | 1955 | ~110 | Single piston engine monoplane trainer |
| Soko WS-55 | — | 38 | Licence-built single piston engine utility helicopter (Westland Whirlwind) |
| Soko J-20 Kraguj | 1962 | 43 | Single piston engine monoplane light attack aircraft |
| Soko G-2 Galeb | 1961 | 248 | Single jet engine monoplane trainer |
| Soko J-21 Jastreb | 1965 | 224 | Single jet engine monoplane light attack aircraft |
| Soko Gazelle | — | 132 | Licence-built single turboshaft engine utility helicopter (Aérospatiale SA 341/342) |
| Soko J-22 Orao | 1974 | ~133 | Twin jet engine monoplane attack aircraft (joint Yugoslav–Romanian programme) |
| Soko G-4 Super Galeb | 1978 | 85 | Single jet engine monoplane advanced trainer |
| Novi Avion | N/A | 0 | Unbuilt single jet engine monoplane multirole combat aircraft (programme cancelled 1991) |
Historical Context
Soko's most significant achievement was the J-22 Orao (Eagle), developed jointly with Romania's CNIAR under the codename Yurom. This twin-engine, transonic ground-attack aircraft represented the pinnacle of non-aligned military aviation development — a fully indigenous combat jet produced without reliance on either superpower bloc. The Orao entered service in 1984 and remained operational with the Serbian Air Force into the 2000s.
The G-2 Galeb (Seagull) and its derivative the J-21 Jastreb (Hawk) formed the core of Yugoslav jet training and light attack capability through the Cold War decades. The Galeb was also exported to Libya and Zambia. The later G-4 Super Galeb served as the advanced jet trainer of the Yugoslav and successor-state air forces well into the post-war period.
Production at Soko's Mostar facility was severely disrupted during the Yugoslav Wars (1991–1995), and the factory sustained significant damage during the Siege of Mostar. The Novi Avion (New Aircraft) programme — an ambitious indigenous multirole fighter intended to replace the MiG-21 — was cancelled in 1991 as Yugoslavia dissolved.
Primary-Source Documentation at Online Aviation Library
The Online Aviation Library's Yugoslavia & Serbia Aviation Collection brings together primary-source technical documentation for Soko aircraft — original factory manuals, maintenance publications, and technical orders as issued during active service. These are archival, static-copy editions fixed at their original publication dates, intended for historical reference, flight simulation, museum restoration, and educational use.
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