SOKO J-21 Jastreb (Hawk)

Light Attack / Advanced Trainer Aircraft [ 1968 ]

Just over 100 of the SOKO J-21 Jastreb ligth attack aircraft were produced for various global operators during the Cold War decades.

Authored By: Staff Writer | Last Edited: 08/07/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

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The SOKO J-21 "Jastreb" ("Hawk") of the former Yugoslavia was a further development of the original G-2 "Galeb" of 1961 (detailed elsewhere on this site). The two-seat Galeb stood as the country's first indigenously designed, developed and produced aircraft and fulfilled the roles of advanced jet trainer and light attack aircraft for the Yugoslav Air Force. Two hundred forty-eight of the type were completed from 1965 to 1983. The J-21 continued this line as a direct offshoot and was developed specifically as a one-seat light attack platform to which followed 121 of the type produced from 1967 to 1977. Once again, the Yugoslav Air Force became a primary operator.

While the G-2 was used to succeed the aging, outgoing line of American Lockheed T-33 Shooting Star trainers, the J-21 was selected to succeed the aging, outgoing line of American Republic F-84 Thunderjet fighter-bombers.

The Jastreb was given a more powerful engine fit which increased both performance and capabilities and this allowed extra hardpoints to be installed for even greater war loads. The internal structure of the aircraft was reinforced and support for JATO (Jet-Assisted Take-Off) was introduced allowing for better short-field operation (2 x solid-fueled rocket units of 1,000lb thrust each). 3 x 12.7mm Browning AN/M3 Heavy Machine Guns (HMGs) now took their place in the nose assembly, unlike the two guns featured in the G-2. Hardpoints numbered eight and supported rockets and conventional drop ordnance including napalm and cluster bombs.

Because of its origins in the G-2, the J-21 retained much of the former design's form and function. The fuselage was slim in profile and accommodated a single crewman under a lightly-framed canopy with decent vision. The aircraft was powered by a single turbojet engine buried within the slender fuselage and this installation was aspirated by a small pair of intakes mounted to the sides of the fuselage. The wing mainplanes were straight and clipped at their tips where tanks were affixed. The tail unit featured a single vertical fin and low-set horizontal planes. The undercarriage remained a tricycle arrangement, wholly retractable.

Power stemmed from a BMB (Rolls-Royce / Bristol Siddeley) Viper Mk 531 turbojet engine of nearly 3,000 lb of thrust. Performance specs included a maximum speed of 820 kmh, a cruising speed of 740 kmh, a range out to 1,520 kilometers and a service ceiling of 12,000 meters. Rate-of-climb was 4,100 feet-per-minute.

Original production models were simply designated J-21 and this design could double as a reconnaissance aircraft in addition to fulfilling the ground attack role. The J-21E became an export version of this mark. The RJ-21 followed as a more dedicated reconnaissance model and outfitted with applicable photo-reconnaissance (camera) equipment for the role. The RJ-21E was, in turn, the export version of this model. The NJ-21 was developed as a two-seat advanced jet trainer that retained some of the light attack functionality common to the J-21 line.

J-21s saw combat exposure in the First Congo War (1996-1997) and the Yugoslav Wars of the 1990s. Several Serbian J-21s were engaged and shot down by American Air Force Lockheed F-16 Fighting Falcons. Operators of the J-21 series went on to include the Libyan Air Force, Republika Srpska, Zaire and Zambia. Some examples fell into the hands of rebels of the Free Libyan Air Force during the 2011 Libyan Civil War.©MilitaryFactory.com

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Specifications

Service Year

1968

Origin

Yugoslavia

Status

ACTIVE
In Limited Service.

Crew

1

Production

121
UNITS

SOKO - Yugoslavia / Bosnia and Herzegovina

(View other Aviaton-Related Manufacturers)

Libya; Republika Srpska (Bosnia and Herzegovina); Yugoslavia; Zaire; Zambia

(OPERATORS list includes past, present, and future operators when applicable)

✓ Close-Air Support (CAS)
Developed to operate in close proximity to active ground elements by way of a broad array of air-to-ground ordnance and munitions options.

✓ Training (General)
Developed ability to be used as a dedicated trainer for student pilots (typically under the supervision of an instructor).

Length

35.6 ft
(10.85 m)

Width/Span

34.6 ft
(10.55 m)

Height

12.0 ft
(3.65 m)

Empty Wgt

14,330 lb
(6,500 kg)

MTOW

24,791 lb
(11,245 kg)

Wgt Diff

+10,461 lb
(+4,745 kg)

(Showcased structural values pertain to the base SOKO J-21 Jastreb (Hawk) production variant)

Installed: 1 x BMD (Rolls-Royce / Bristol Siddeley) Viper Mk 531 turbojet engine developing 2,990lb of thrust.

Max Speed

510 mph
(820 kph | 443 kts)

Ceiling

39,370 ft
(12,000 m | 7 mi)

Range

944 mi
(1,520 km | 2,815 nm)

Rate-of-Climb

4,100 ft/min
(1,250 m/min)

♦ MACH Regime (Sonic)

Sub

Trans

Super

Hyper

HiHyper

ReEntry

♦

(Showcased performance specifications pertain to the base SOKO J-21 Jastreb (Hawk) production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)

STANDARD:
3 x 12.7mm Browning AN/M3 heavy machine guns

OPTIONAL:
Up to 2,000lb of externally-carried ordnance across eight hardpoints.

Supported Types

Graphical image of an aircraft medium machine gun

Graphical image of an aircraft heavy machine gun

(Not all ordnance types may be represented in the showcase above)

Hardpoint Mountings: 8

J-21 "Jastreb" - Base Series Designation

J-21E - Export variant

RJ-21 - Tactical reconnaissance variant

RJ-21E - Export model of RJ-21

NJ-21 - Two-seat advanced trainer aircraft

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