Military Factory logo
Icon of a dollar sign
Icon of military officer saluting
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of AK-47 assault rifle
Icon of navy warships

SOKO J-21 Jastreb (Hawk)

Light Attack / Advanced Trainer Aircraft

SOKO J-21 Jastreb (Hawk)

Light Attack / Advanced Trainer Aircraft

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
MEDIA
OVERVIEW



Just over 100 of the SOKO J-21 Jastreb ligth attack aircraft were produced for various global operators during the Cold War decades.
National Flag Graphic
ORIGIN: Yugoslavia
YEAR: 1968
STATUS: Active, Limited Service
MANUFACTURER(S): SOKO - Yugoslavia / Bosnia and Herzegovina
PRODUCTION: 121
OPERATORS: Libya; Republika Srpska (Bosnia and Herzegovina); Yugoslavia; Zaire; Zambia
SPECIFICATIONS



Unless otherwise noted the presented statistics below pertain to the SOKO J-21 Jastreb (Hawk) model. Common measurements, and their respective conversions, are shown when possible.
CREW: 1
LENGTH: 35.60 feet (10.85 meters)
WIDTH: 34.61 feet (10.55 meters)
HEIGHT: 11.98 feet (3.65 meters)
WEIGHT (EMPTY): 14,330 pounds (6,500 kilograms)
WEIGHT (MTOW): 24,791 pounds (11,245 kilograms)
ENGINE: 1 x BMD (Rolls-Royce / Bristol Siddeley) Viper Mk 531 turbojet engine developing 2,990lb of thrust.
SPEED (MAX): 510 miles-per-hour (820 kilometers-per-hour; 443 knots)
RANGE: 944 miles (1,520 kilometers; 821 nautical miles)
CEILING: 39,370 feet (12,000 meters; 7.46 miles)
RATE-OF-CLIMB: 4,100 feet-per-minute (1,250 meters-per-minute)




ARMAMENT



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

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



Series Model Variants
• 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


HISTORY



Detailing the development and operational history of the SOKO J-21 Jastreb (Hawk) Light Attack / Advanced Trainer Aircraft.  Entry last updated on 8/7/2018. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
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.




MEDIA









Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

Image of collection of graph types

Relative Maximum Speed Rating
Hi: 750mph
Lo: 375mph
    This entry's maximum listed speed (510mph).

    Graph average of 562.5 miles-per-hour.
City-to-City Ranges
NYC
 
  LDN
LDN
 
  PAR
PAR
 
  BER
BER
 
  MSK
MSK
 
  TKY
TKY
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Graph showcases the SOKO J-21 Jastreb (Hawk)'s operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
121
121

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


Altitude Visualization
Small airplane graphic
Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
VIP
Passenger
Business
Recon
SPECOPS
X-Plane/Development
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Supported Arsenal
Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Commitments / Honors
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.