Soko J-20 Kraguj
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|J-20 Kraguj in private collection with Yugoslav marks at a local airshow in Serbia, 2009.|
|Design group||Aeronautical Technical Institute|
|First flight||21 November 1962|
|Status||Retired in 1989|
|Primary user||Yugoslav Air Force (1967-1989)|
The Soko J-20 Kraguj (Sparrowhawk) is light military, single-engine, low-wing single-seat aircraft with a metal airframe, capable of performing close air support, counter insurgency (COIN), and reconnaissance missions, that was designed by VTI and manufactured by SOKO of Yugoslavia, first flown in 1962.
It is of classic semi-monocoque, metal structure with a slightly tapered wing. The pilot is accommodated in an enclosed, heated and ventilated cockpit with adjustable seats. The cockpit canopy slides backwards to open. The landing gear is non-retractable with a tail wheel. Rubber dampers provide shock absorption, and hydraulic brakes are used for wheel braking.
The power plant comprises one 340 hp Textron Lycoming GSO-480-B1J6 piston engine and Hartzell HC-B3Z20-1/10151C-5 three-blade metal variable-pitch propeller. The engine cooling airflow is intensified by means of two specially designed ejectors. 36 US Gal of fuel contained in two rubber tanks enables a flight range of 350 NM for the fully armed configuration of the aircraft. 28 V DC electric power is supplied from a 1,5 kW generator and a storage battery. De-fogging and de-icing of the windshield is done by blowing of hot air.
Permanent armament comprises two wing-mounted 7.7 mm Colt–Browning Mk-II machine guns with 650 rounds each and a collimator sight in the cockpit. For combat missions there is a capacity for an external load of bombs and two 57 mm and two 128 mm (HVAR-5) air-to-ground rocket launchers. Adapters on the underwing pylons can be used to switch the armament configuration from free-fall bombs to multi-tube launchers with twelve 57 mm air-to-ground rockets. Cluster or cargo bombs, or 128 mm air-to-ground rockets can be fitted.
The aircraft was specially designed for low-altitude missions against day and night visible ground targets in a broad area. It was readily available to be loaded with weapons and supplied through a flexible system of auxiliary airfields that required no special preparations, especially in mountainous regions. Yugoslav military planners assumed that potential aggressor will first disable airfields. Therefore, J-20 Kraguj was designed to take-off from short unprepared runways, even ones covered in deep snow when fitted with skis. It was also called a "Partisan aircraft".
The Kraguj P-2 was intended for close ground force support, and could be used for training of pilots in visual day/night flights, aiming, missile firing and bombing of ground targets.
- Croatian Air Force - Former operator.
- Republika Srpska Air Force - Former operator.
Data from Jane's All the World's Aircraft 1969-70 
- Crew: 1
- Length: 7.93 m (26 ft 0 in)
- Wingspan: 10.64 m (34 ft 11 in)
- Height: 3 m (9 ft 10 in)
- Wing area: 17 m2 (180 sq ft)
- Airfoil: NACA 4415
- Empty weight: 1,130 kg (2,491 lb)
- Max takeoff weight: 1,624 kg (3,580 lb)
- Powerplant: 1 × Lycoming GSO-480-B1A6 6-cylinder air-cooled horizontally-opposed piston engine, 254 kW (341 hp)
- Propellers: 3-bladed constant-speed propeller
- Maximum speed: 295 km/h (183 mph, 159 kn) at 1,500 m (4,921 ft)
- Cruise speed: 280 km/h (170 mph, 150 kn)
- Stall speed: 88 km/h (55 mph, 48 kn)
- Range: 800 km (500 mi, 430 nmi)
- Service ceiling: 8,000 m (26,250 ft)
- Rate of climb: 8.00 m/s (1,575 ft/min)
- Guns: 2 × 7.7 mm Colt–Browning Mk.II machine guns (650 rounds each)
- Rockets: 2 × 12 round rocket pack or 6 × 57 mm or 127 mm rocket
- Bombs: 2 × 100 kg (220 lb) bombs
Aircraft of comparable role, configuration and era
- J W R Taylor 1969, p.506.
- Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
- Taylor,John W.R. (editor). Jane's All The World's Aircraft 1969-70. London: Sampson Low,1969.
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