Soko J-21 Hawk (Jastreb)




The Soko J-21 Jastreb is a Yugoslav turbojet attack aircraft, designed by the Aeronautical Technical Institute (ATI), (Serbian: Vojnotehnički Institut Beograd (VTI)), in Belgrade and manufactured by SOKO. Derived from the G-2 Galeb advanced jet trainer and light attack aircraft, it was designed in single-seat ground attack and two-seat advanced flying / weapon training versions.




It was developed as a replacement for the Republic F-84 Thunderjet, which was the most commonly used jet fighter-bomber in the Yugoslav Air Force until 1967. At the beginning, when it designed, Hawk is mainly used as a jet pilot training and reconnaissance, although it could be used for attacks because it was designed primarily as an attack aircraft. The biggest difference between J-21 and G-2 Galeb, the removal of the rear seats, a more powerful engine and the installation of additional third machine guns in the nose. All three machine guns were Browning AN / M3. He had a seat that could catapult. Is made under license from Folland Type 1-B. He was riding a motorcycle that is made under license by Rolls-Royce Viper Mk531.



The aircraft was manufactured in the aviation factory Soko in Mostar, until the 1980s. It was used in the Yugoslav Air Force, until the breakup of Yugoslavia, when this aircraft used Air Force of the Republic of Serbian and Serbia. A number of aircraft sold to Libya and was still used.



The maximum speed of the Hawk, at an altitude of 5,000 m and without external cargo, was 724 km / h, while at the level of the sea, with two bombs of 250 kg, was 629 km / h. Cruising speed ranged from 650 to 680 km / h, a service ceiling of 11,000 meters. Range amounted to 1,150 km, a combat radius of 270 to 360 kilometers.



In relation to the Galeb, Jastreb because of reinforced structures, could carry little more weapons. Besides the three machine gun Colt-Browning AN-M3 caliber 12.7 mm, with the 135 bullets, in the nose, the hawk could carry up to 800 kg load on the under wing carriers, launchers NRZ and additional tanks, unguided rocket HVAR.



J-21 Hawk was used extensively in the war during the period 1991-1995. especially in Bosnia and Herzegovina and in the First Congo War (1996th-1997th).
After the war, the agreement on the reduction of military forces, the Federal Republic of Yugoslavia it retired the remaining 66 Hawks.



versions
J-1 Hawk - Single seat, for the attacks and reconnaissance.
J-1E - Export version for Libya.
RJ-1 - Single seat, for strategic intelligence.
RJ-1E - Export version of RJ-1.
JT-1 - Two-seater for training.

General characteristics

Crew: 1
Length: 10.88 m (35 ft 8 in)
Wingspan 10.56 m (34 ft 8 in)
Height: 3.64 m (11 ft 11 in)
Wing area 19.43 m2 (209.1 sq ft)
Maximum takeoff weight: 5,100 kg (11,244 lb)
Fuel capacity: 440 kg (970 lb) internal fuel + 435 kg (959 lb) and 2x 275 liters (60 imp gal; 73 US gal) jettisonable wing-tip fuel tanks.
Powerplant: 1 × BMB (Rolls-Royce / Bristol Siddeley) Viper Mk 531 turbojet engine, 13:32 kN (2,990 lbf) thrust
Powerplant: 2 × JATO units solid-fueled rockets, 4.45 kN (1,000 lbf) thrust each

J-21 at the Museum of the Yugoslav Air Force


performance

Maximum speed: 820 km / h (510 mph; 443 kn)
Cruising speed: 740 km / h (460 mph; 400 kn) at 5,000 m (16,000 ft)
Range: 1.520 km (944 mi; 821 nmi) with tip tanks
Ceiling: 12,000 m (39,370 ft)
g limits: +8 -4
Rate of climb: 21 m / s (4,100 ft / min)

armament

Guns: 3x 12.7 mm (0.5 in) Browning AN / M3 machine guns
Hardpoints 8 with a capacity of inboard pylons (2 of) 250 kg (550 lb), outboard pylons (6 of) 50 kg (110 lb), with provisions to carry combinations of:

Line drawing of J-21 Jastreb


Other:
2x 150 liter (33 imp gal; 40 US gal) napalm tank
2x Rocket pods each with 12x 55 mm (2.17 in) rockets
Rockets: 6x WCC-157 127 mm (5.00 in) rockets
Bombs:
2x 250 kg (550 lb) General Purpose bombs or
2x 150 kg (330 lb) Cluster bombs or
2x 120 kg (260 lb) cluster fragmentation bombs
avionics
K-14C or K-14A gun sight



Sources:
https://en.wikipedia.org/wiki/Soko_J-21_Jastre

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