ADA Tejas (LCA) News and Discussions

[smartindian]

The LCA mk 1 is turning out to be a GOOD plane.
1. Composite materials .2. Elta Radar 3. BVR capable 4. EW suite 5.Low RCS

Lets wait for the mk 2 with a better engine and improved radar .In MK 2 there will also be changes to wings and air intakes .
The amount of design,development and system integration experience that ADA and DRDO has gained is PRICELESS

completely i agree with you , and we have to develop kaveri engine it will be like ice on the cake

 

[Kunal Biswas]

the poorly designed ameturish air take limits the optimal air flow to the engine of tejas at high AOA and coupled with the underpowered engine is the only case for limiting alpha and flight maneuverability.

Let me remind all here, who think LCA is a dog-fighter..
LCA was deigned based on Mirage-2000, Back in days IAF demand was a supersonic interceptor with BVR..
Mirage 2000 was a good long range interceptor during 80s and Mig-29 was a dog-fighter..
therefore the deign of LCA of today is good also it gives more than just being a interceptor..
though i do agree abt its low powered engines...

 

[Patriot]

LCA is meant to replace MIG-21 & exceed the performance of MIG-21 and it is matching the same. ADA has done good work so far and it takes time to come up with such original AC with out prior experience. ADA's job is commendable. Every good thing takes it's own time.

 

[Daredevil]

Well if it was just that i would not mind but according to the article.

Testing times ahead for HAL

Ajai Shukla was in fact quoting some one , that could be considered an insider source.

The problem with that statement is that they have never tested high AoA but already predict that it will stall. When LCA was designed the high AoA characteristic to be achieved is 35 degree based on the wind tunnel tests. Let me post an excerpt from an article by B.Harry of how LCA-Tejas design makes it possible to achieve high AoAs. He gives a very good scientific explanation behind this.

Being a delta, optimal performance is achieved in the higher-speed, higher-altitude flight regimes with low super-sonic and wave drag. Certain low speed and high alpha (AoA) performance and handling issues inherent to the delta wing design, are addressed through both FBW control and certain aerodynamic features which also serve to fully exploit the high-lift characteristics of delta-wing, not done on previous designs. The high-set wing of Tejas is essentially a compound delta with a CFD optimised camber and twist and a unique low-sweep leading edge crank, whose primary function is both the generation and control of concentrated vortices during high Alpha. The steady downstream flow of strong vortices, re-energizes the boundary layer, stabilizes the air-flow, prevents flow separation and creates a suction effect that increases lift. Similar in function to, but better than a large strake or a thin leading edge root extension (LERX), the result is a superior coefficient of lift and more stable rolling and bending moment characteristics at high Alpha (AoA), thus reducing vortex lift as well as creating instability and control issues, is addressed through the design of compound wing that controls the strength of the vortices within the AoA regime. Two hollow spill ducts on the wing, next to the the leading edge, connect with the intake splitter and acts as a suction system for boundary layer/vortice control and reducing skin friction drag.

Independently actuated, three-segment leading edge slats to increase wing area, controllability and lift at high AoA, have been adopted on each wing. Through accelerating the air flow and merging it with the boundary layer, stall at high Alpha is delayed and the effective lift is increased, also allowing for steeper climb angles. The high degree of smooth-wing body blending and area ruling produces a slender, streamlined airframe that ensures minimum drag in all flight regimes. Wing shielding for the inlets, serves to even the air-flow to intake at high AoA flight, reducing intake losses and flow distortions. Wind-tunnel tests on air-intake models have been used to predict the buzz boundary and pressure performance and thus optimize the diverter configuration of the intake for buzz free operation and high pressure recovery. maximum pressure at engine inlet is 260 KPa.

You can read more here (a must for LCA enthusiasts)

http://www.bharat-rakshak.com/IAF/downloads/Tejas-Radiance.pdf

I think Comparing it to the Mirage-2000 is a redundant process LCA by it's very nature and time frame should be more comparable to the older Mirage-2000 that does not even have a production line anymore.

We should examine home well it can do against the Gripen , Rafale , J-10 , Typhoon .

That covers most of its Export rivals.

Why Mirage-2000 old or new should not be compared to LCA?? I'm comparing LCA to Mirage-2000 because both being delta and have similar air-intake design. If Mirage-2000 can sustain high alpha then it is obvious that LCA can also sustain. Only thing needed is to open up the flight envelop and test its performance at high Alpha. Till then it is waste of time to criticize air-intakes.

And also you need to make up your mind that LCA is a 4th gen fighter and cannot be compared to 4++ fighters that you have listed.

I have seen this Video , and to be fair while i was ecstatic about seeing the Tejas fly for the first time
I was a bit disappointed that the plane did not turn like i hoped it would , and even compared to the turning of the Gripen , it is a bit lackluster.

You cannot base the turn rate of an A/C based on one video. In an air show we don't know what was aim of the pilot - whether to show high turn-rate or just the ability to turn. And also turn rate will depend on T/W ratio (LCA has less than 1) and the initial speed with which it enters before initiating the high turn maneuver. So, there are many parameters that we don't know to base the exact turn rate of LCA (though I will agree that it is definitely lesser than 4++ fighters due to low powered engine).

Ok , then let them get some experience , that does not mean the flaws in the current air intakes coupled with the aircraft can be ignored. That still does make my point void. I am just saying the current alpha can be improved by improving the Air intakes , when they can imporve them imrove them

I think it is not fair to criticize the air-intake design without even testing it at high Alpha. Let's wait for the results before jumping the gun.

And I'm with you that we need to fix all problems that ail LCA and with constant testing LCA and modifications we will get a much better LCA than the present one.

 

[nitesh]

now what is this?

Livefist - The Best of Indian Defence: IAF Conducts Poll, Asks If LCA Tejas Will Replace MiG-21 In Time!

 

[neo29]

now what is this?

Livefist - The Best of Indian Defence: IAF Conducts Poll, Asks If LCA Tejas Will Replace MiG-21 In Time!

Poll is meaningless. Its already behind schedule to induct LCA by years. When the induction is already delayed, why IAF is asking whether it will replace mig 21 on time.

 

[nitesh]

Poll is meaningless. Its already behind schedule to induct LCA by years. When the induction is already delayed, why IAF is asking whether it will replace mig 21 on time.

I too was not able to understand the "on time" thing

 

[vijay jagannathan]

The problem with that statement is that they have never tested high AoA but already predict that it will stall. When LCA was designed the high AoA characteristic to be achieved is 35 degree based on the wind tunnel tests. Let me post an excerpt from an article by B.Harry of how LCA-Tejas design makes it possible to achieve high AoAs. He gives a very good scientific explanation behind this.






Why Mirage-2000 old or new should not be compared to LCA?? I'm comparing LCA to Mirage-2000 because both being delta and have similar air-intake design. If Mirage-2000 can sustain high alpha then it is obvious that LCA can also sustain. Only thing needed is to open up the flight envelop and test its performance at high Alpha. Till then it is waste of time to criticize air-intakes.

And also you need to make up your mind that LCA is a 4th gen fighter and cannot be compared to 4++ fighters that you have listed.



You cannot base the turn rate of an A/C based on one video. In an air show we don't know what was aim of the pilot - whether to show high turn-rate or just the ability to turn. And also turn rate will depend on T/W ratio (LCA has less than 1) and the initial speed with which it enters before initiating the high turn maneuver. So, there are many parameters that we don't know to base the exact turn rate of LCA (though I will agree that it is definitely lesser than 4++ fighters due to low powered engine).



I think it is not fair to criticize the air-intake design without even testing it at high Alpha. Let's wait for the results before jumping the gun.

And I'm with you that we need to fix all problems that ail LCA and with constant testing LCA and modifications we will get a much better LCA than the present one.

B harry(whoever he is) has done a commendable job providing in depth analysis of the LCA. from what it appears its an article that was written between around 2001 to maybe 2004. We are 6 years down the line and no doubt there have been a lot of obsolence and re engineering and new ideas gone into LCA. wish there can a indepth retrospective look till date from where the article concludes. Is B. Harry listening?

 

[Mustang]

Mirage200 and LCA intakes are not really same. The former has an adjustable nose cone which increases the efficiency of air intakes. It can be seen in its picture.

 

[rakesh]

Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

Wednesday, September 8, 2010
*Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

Chindits: *Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

 

[rakesh]

Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

Wednesday, September 8, 2010
*Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

Chindits: *Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

 

[Daredevil]

No need for another thread. Use existing LCA thread.

 

[Agantrope]

Fruit after 10 years of hard work, Kudos to ADA Team and HAL:happy_8:

 

[vijay jagannathan]

what are the requirements for getting IOC?
what are the requirements for getting FOC? how long will this take?

of course will the entire process have to be repeated for Mark 2. are the IOC and FOC requirements standardized around the world? do some designers gain advantage by cutting time due to previously validated systems?

 

[nitesh]

Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

Wednesday, September 8, 2010
*Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!


Chindits: *Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore !!!

the new flash says:

Chindits: *Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore, EJ-200 Likely Winner For Mk-II !!!

*Flash* : Antony To Declare Initial Operational Clearance For LCA-Tejas On December 27, 2010, In Bangalore, EJ-200 Likely Winner For Mk-II !!!


I am happy that finally the winner will be announced

 

[luckyy]

*Flash* : EJ-200 Likely Winner For Mk-II !!!

is it the wish of Chindits

or a news ?

 

[nitesh]

is it the wish of Chindits

or a news ?

Well as ritesh also said we can only hope for the best. But one thing to take from this is finally we will (might) see MK 2 work start

 

[JHA]

Suman sharma and Shiv Aroor are like AAJ-TAK and India Tv..Both try Create sensation out of nothing at many times....

 

[The Messiah]

 

[FearlessTiger]

Few SENSITIVE documents which was earlier hacked by CHINESE HACKERS
ӡLCAսϵͳ_ٶĿ