India and Pakistan have a tendency to compare each other in every aspect especially when it comes to defence and military capabilities of each other. In this line a very hot contested topic is the indigenous fighter jets of both countries. The pride of both countries Tejas and JF-17 Thunder.
India and Pakistan have a tendency to compare each other in every aspect specially when it come to defence and military capabilities of both countries. In this line a very hot contested topic is indigenous fighter of both countries. The pride of both countries Tejas and J/F-17 Thunder.
India has designed and developed the LCA Tejas from tip-to-toe but that is not the case with the JF-17 Thunder. The JF-17 which Pakistan claims to be a product of their own innovation is basically designed and developed by Chengdu Aircraft Corporation (CAC) of China and is jointly manufactured by Pakistan and China. Hence the term JF which stands for "Joint Fighter" was given to the fighter jet.
Before starting my comparison I would like to clear a few things. Most of the data for comparison has been taken from official websites of both fighter jets and the remaining from reliable online sources. I would also like to state that I have taken only those points into consideration that actually matter in an AtoA (air-to-air) combat with other things keeping aside for this comparison.
Comparison is between the LCA Tejas MK-I and the JF-17 Block I ::
1- Location of Combat >>
The first thing that will matter a lot will be the most probable location of fight. Based on the range of Tejas, its role will be that of a primary air defence aircraft and being 2nd in line fighter jet with primary offensive roles designated to the state-of-the-art Su-30 MKI, Mig-29s and Mirages, it is very unlikely that the Tejas will ever cross the international border. On the other hand, the JF-17 along with the F-16s will form the backbone of the Pakistani Air Force and will be assigned with an offensive task. So the most obvious location of an AtoA face-off between the two jets will be in Indian Airspace.
Though this is not a deciding factor but familiarity with terrain, operating under air defence environment with ground radars, AWACS, SAM and AA guns matters a lot. This will definitely be a disadvantage for the JF-17 Thunder. Same will be the case if the LCA Tejas operates in Pakistani Airspace which is very unlikely. India has other fighter jets like the 'SEPECAT Jaguar' which are described as "deep penetrating strike aircraft".
2- BVR Combat >>
Both Tejas and JF-17 uses PESA multi-mode radars. The JF-17 uses KLJ-7 radar which has a detection range of 130km for 5m2 size aircraft and 75 km for 3m2 size aircraft (Chinese claim). The JF-17s official website claims it has a 105 km for 5m2. (I am giving advantage to J/F-17 on this and taking it based on Chinese claims).
The LCA Tejas uses EL/M-2032 radar which has detection and tracking range of 150 km. Generally detection and tracking range is always given for 5m2 size aircraft, however it is not clear if it is for 5m2 size aircraft or not so let's put both radars on par i.e. 130 km for 5m2 size aircraft. Both have ECM suite which are on par and carry EW pods externally. Both jets RCS is classified but I am taking it on the basis of claims made by websites of respective countries. RCS of JF-17 is 3m2, this will allow Tejas to detect a JF-17 from 75 km away. Tejas being designed keeping stealth in mind, its RCS is claimed to be 1/3 of mirage 2000 by some sites which makes it around 1.6m2 while others claim it to be 1.5m2 . Ignoring both claims I take it to 2m2. So the JF-17 will only be able to detect the Tejas at around 50 km away while Tejas will see an approaching JF-17 75 km away.
LCA's primary BVR missiles will be R-77 and Derby while the JF-17 will use SD-10 which is variant of Chinese PL-12. Performance wise both missiles are at par. R-77 has range of 80 km while SD-10 has a range of 70 km. Range of the missile don't matter as the radar of both jets will only be able to detect each other within their BVR range, but with Tejas being able to detect the enemy first, it will also have the advantage to fire first i.e. from 75 km away while the JF-17 will have no clue of the Tejas for another 25km. The only warning the JF-17 will feed its pilot will be that of an approaching missile.
3- WVR Combat >>
G tolerance of both jets is same i.e. +8.5g/-3g. Both have equal speed of Mac 1.6. The TWR (thrust to weight ratio) of Tejas is 1.07 and the JF-17 is 0.95. Angle of Attack of Tejas is 24 degrees while JF-17 has 26 degree ('Doubtful and overrated' as only 1 source claim about it and no other info available, but let's accept the claim since even the Gripen and the F-16 has an AoA of 28 degrees so definitely the JF-17 cant have equal but can have lower than 26 degrees). Less AoA of Tejas is Nullified by its better TWR. JF-17 will definitely have an advantage here during the first few turns but if Tejas will be able to survive during this period then the JF-17 will face a disadvantage due to quicker loss of speed. Given the fact that the JF-17 has Smokey RD-93 engines, there is possibility for Tejas to survive as it will have JF-17 in sight because of smoke tail left by its engine.
Now one more factor that will add to the disadvantage for the JF-17 is the Helmet Mounted System of Tejas. HMS will provide High off BoreSight shooting ability to Tejas as compared to the JF-17 which does not have a Helmet Mounted System. This further diminishes the initial turn rate advantage of the JF-17.
4- Service Ceiling >>
The service ceiling of the LCA is 15250m while that of the JF-17 16500m. All that the JF-17 has to do is climb above the service ceiling of Tejas and it will be able to avoid a dog-fight and run away into its airspace. But the difference of barely 1250m will not keep the JF-17 safe from the missiles loaded on the LCA Tejas.
5- Digital Fly BY Wire >>
Tejas uses Quadruplex Digital FBW while the JF-17 has FBW in only pitch axis. This gives the Tejas an advantage of easy controls during high angle of attacks as compared to the JF-17 where the pilot has to put an extra effort to control the aircraft. This will indirectly affect pilot performance while performing high G maneuvers required in close combat.
6- Combat radius >>
Tejas has a combat radius of mere 500 km while the JF-17 has radius of 1350 km. Combat radius matters if a fighter jet is designed for deep strike missions and gives an ability to stay in the air for long hours before being refueled, thus saving precious time.
So no doubt this round to the JF-17.
Conclusion ::
So when it comes to BVR combat, Tejas has a clear edge over its opponent with less RCS and longer range Radar. The JF-17 is on par with Tejas in close combat scenario. The JF-17 has advantage if it decides to play hide and seek with Tejas flying above the service ceiling waiting for it to loose its precious fuel and then engage.
In the end I would say that an AtoA combat depends more on Pilot skills and how a pilot understands and uses the advantages of his aircraft and how he guards its weaknesses.
So just like how the small GNATS became Sabre slayers, who knows in future wars, and with constant upgrades to the Tejas, the LCA might very likely become a Thunder slayer.
Defence News - Comparison between LCA Tejas and JF-17 Thunder in an A-to-A Scenario
after flying tejas forget landing 
