[Data Sheet] SOKO J-21 Jastreb

[SubRyan 5,556]

Model: J-21 Jastreb

Technical Description: 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.
 

Configuration: Ground attack

First flight: 19 July 1965
Introduction year:
 
Crew Data
Number of crew: 1
Roles of crew: Pilot

 

Engine Data (Jet Aircraft)

Manufacturer: BMB (Rolls-Royce/Bristol Siddeley)
Name: Viper Mk 531
Number of engines: 1

Injection: none

Fuel:

Dry weight: 358 kg (789 lb)

 

Fuel Data
Fuel tanks: 440 kg (970 lb) internal fuel + 435 kg (959 lb) in 2 x 275 l (60 imp gal; 73 US gal) jettisonable wing-tip fuel tanks
Fuel consumption: 1(lb/hr)/lbf
 
Power Data
WEP: 
Take Off Power: 
Maximum Power: 13.878 kN (3120 lbf)
Cruising Power:

Basic Geometric Data
Length: 10.711 m
Wingspan with the external wing tanks: 11.685 m

Wingspan: 10.56 m
Wing area: 19 m²
Height: 3.613 m
Flap area: 2.02 m²

Tail plane area: 6.44 m²

Fin area: 1.34 m²
Elevator area:
Rudder area: 0..556 m²
Right aileron area: 1.18 m²

Left aileron area: 1.35094 m²

Left aileron trimmer area: 0.044906 m²

Air brakes area: 0.335 m²
 
Weight Data
Empty weight: 2815 kg

Weight fully equipped planes with fuel in internal and external wing

disposable containers and pilot: 4100 kg

Max takeoff weight: 5000 kg
 
General Performance Data
Maximum speed:

Minimum speed:

Landing speed:
Cruising speed: 
Service ceiling: 
Range: 
 
Max Speed Chart {IAS)
.. at 0 meters  710.3 km/hr
.. at 1.000 meters  682.7 km/hr
.. at 2.000 meters  654.1 km/hr
.. at 3.000 meters  623.1 km/hr

.. at 4.000 meters  593.6 km/hr

.. at 5.000 meters  561.5 km/hr

.. at 6.000 meters  527.9 km/hr

.. at 7.000 meters  495.7 km/hr

.. at 8.000 meters  463.1 km/hr

 
Rate of Climb (4104 kg)
.. at 1.000 meters    20 m/s
.. at 2.000 meters    18.5 m/s
.. at 3.000 meters    17 m/s
.. at 4.000 meters    15.5 m/s

.. at 5.000 meters    13.8 m/s

.. at 6.000 meters    12.3 m/s

.. at 7.000 meters    11.5 m/s

.. at 8.000 meters    9.0 m/s

 

Time to altitude (4104 kg)
.. to 1.000 meters    1.2 min
.. to 2.000 meters    2 min
.. to 3.000 meters    3 min
.. to 4.000 meters    4.5 min

.. to 5.000 meters    5.8 min

.. to 6.000 meters    7.3 min

.. to 7.000 meters    9 min

.. to 8.000 meters    11 min

 
Armament

• Guns: 3x 12.7 mm (0.5 in) Browning AN/M3 machine guns
• External weapons:
  • 6 x RZ HVAR-5 rockets
  • 4 x RZ HVAR-5 rockets & 2 L-57-12 rocket launchers
  • 4 x RZ HVAR-5 rockets & 2 L-128-04 rocket launchers
  • 6 x RZ HVAR-5 rockets & 2 x FAB-50 bombs
  • 2 x FAB-250 bombs

 
Ammunition:
unknown
 
Notes

 

 
Sources
 
1. Turbofan and Turbojet Engines: Database Handbook by Elodie Roux

2. Upravljanje avionom J-21, IJ-21 [01.VTUP.016 / 06.0.009]

 
Updates
07-02-2015 - Initial Template

Edited February 8, 2015 by SubRyan

[SubRyan 5,556]

I am having trouble translating the manual for this aircraft, so quite a few things are blank for now with regards to performance

 

Also the geometric data might be off due to bad translation, if anyone knows this language help would be appreciated

 

 

Edited February 8, 2015 by SubRyan

[Botan 7,952]

First flight: 19 July 1965

 

That's a little too late though.

[SubRyan 5,556]

That's a little too late though.

 

Based off of the charts its top speed was somewhere around 850 km/hr, the engine doesn't have an afterburner, and while it could carry missiles it has guns and could carry rockets and bombs. Performance wise it fits the criteria for inclusion, besides this is just a data sheet

[blockhaj 3,560]

Cut off date is 1953. first flight has to be before that to be accepted.

[Sabeda 171]

I was very skeptical at first due to the first flight date, but you do bring up several logical points so you have my support.

[blockhaj 3,560]

We don't need more low br jets. We only need a tier 4 bomber right now. Even if this plane has the same technology as other planes in wt we don't need it and it flew in 1965 which is way beyond the cutoff date (20 years after ww2!)

Though we appreciate that u are trying to help the project, but this is a little bit too much :/

Edited February 8, 2015 by blockhaj

[Botan 7,952]

Performance wise it fits the criteria for inclusion.

 

But still bombs and armament may be from 60's.

 

Still, criteria for inclusion are not only about performance. If criteria were about performance only, we would have third world armed Cessna's as attackers... So being a 50's plane is criterion as well.  

Edited February 8, 2015 by Botan

[blockhaj 3,560]

http://en.wikipedia.org/wiki/Saab_105

It would be like having this :C

[Cpt_Branko 9,698]

I am having trouble translating the manual for this aircraft, so quite a few things are blank for now with regards to performance

 

Also the geometric data might be off due to bad translation, if anyone knows this language help would be appreciated

 

 

 

Elevator area: 1,666 m^2 (with trimmer)

Elevator trimmer (both): 0,142 m^2

 

The rest of your translation is fine

Edited February 8, 2015 by Cpt_Branko

[BeyondTS 3,605]

Nice sheet and very beautiful plane

[graisseu 504]

I think this plane will be not added by Gaijin . But for you : fhttp://www.avialogs.com/index.php/aircraft/yugoslavia/soko/j-21-jastreb/uppravljanje-avionom-j-21-i-ij-21.html

Edited June 8, 2015 by graisseu