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.

J-20 Kraguj
Soko J-20 Kraguj.jpg
J-20 Kraguj in private collection with Yugoslav marks at a local airshow in Serbia, 2009.
Manufacturer SOKO
Design group Aeronautical Technical Institute
First flight 21 November 1962
Introduction 1964
Status Retired in 1989
Primary user Yugoslav Air Force (1967-1989)
Produced 1964-1977
Number built 43


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".[citation needed]

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.


Yugoslavian J-20 Kraguj on display in the Museum of Aviation in Belgrade, Serbia
  Republika Srpska

Specifications (J-20)Edit

Data from Jane's All the World's Aircraft 1969-70 [1]

General characteristics

  • 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[2]
  • 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

See alsoEdit

Aircraft of comparable role, configuration and era


  1. ^ J W R Taylor 1969, p.506.
  2. ^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". Retrieved 16 April 2019.
  • Taylor,John W.R. (editor). Jane's All The World's Aircraft 1969-70. London: Sampson Low,1969.

External linksEdit