ADA Tejas (LCA) News and Discussions

[Rahul Singh]

Whywould youfit a DSI if you have a fine working air intake without moving parts?

You did not read properly, i had already mentioned why? Please read highlighted part?

Induction of greater drag? True. Impossible? Not at all. Anyway that's for internal weapon bay and podded weapons, but won't F-414 will will have ample thrust? Ok lets leave it for future.

Rest of the developments. well i don't see any reason why LCA won't get RAS when it has already been developed.

Redesigned nose section, well LCA MK-2 engine thrust is so good that any improvement of that nature is every bit possible. LCA will undergo structural weight reduction at MK-2 so even better TWR is expected.

DSI. Well only if present intake is exposing turbine.

-----------

Silly craze for it.

Uff!

 

[Rahul Singh]

When you read the Specs about Tejas STOL, Its is well clear what Tejas holds..

Tejas are unique in there own way, It as AoA of 26-28 degree with R-73 and DASH its WVR capability makes it up quite a challenge for other high AoA preforming fighters like MIG-35 and SU-30MKI..

Sir here is LCA taking off in about 280 meters* which is loaded with two large droop tanks (equivalent weight of 4 BVRAAM or more) and two WVRAAMs. On carrier LCA will have 190 meters to take off but will have ski-jump ramp and head wind to assist apart from it there will be stoppers (lay man's term) which will keep it stopped until engine reaches full afterburner thrust (not possible with nose wheel braking on land based versions), add over it extra lift generated by LEVCONS. And I am still talking about 85 Kn engine mounted LCA MK-1 not MK-2 which will come with 15 % more powerful engine and better aerodynamics less structural weight (pic/poster).

* I am sure IAF runway marking are in meters not foot, if no then make 280 feets = 85 meters, looks impossible, so it is meter.

 

[p2prada]

Uff!

DSI does not help in the aspect you think it does. Don't get carried away by the Pak/Chinese claims.

That's why halloweene said what he said.

Oh boy what a shot...That is the SAMTEL-THALES indian HMD is it not?? ......

It is DASH III.

 

[rahulrds1]

Tejas R-73 Missile firing with Help Of DASH HMDS In Details..

Nice images,


able to see small explosion when missile hits the target.

 

[p2prada]

Re: ADA LCA Tejas Mark-II

If idea is to loose some agility for better LO then why not especially when you have ample thrust to make up for?

Hmm, no. The weight will be too much, drag will be too much, the load on the wings will be unnecessarily high, thrust will be too low.

You can't put a 800-1000Kg EWP on an LCA Mk2 with a 65KN engine and expect similar performance as a Rafale with the same load and with 100KN thrust or even MKI with 150KN thrust.

EWPs were designed for larger strike aircraft with a bigger number of heavy points and which can escort themselves, like SH and Rafale. LCA isn't such an aircraft.

Note that EWPs are heavy. SH EWPs come with 4 missiles, 3 AMRAAMS and 1 SRAAM. The weapons loadout alone is 775Kg. Add EWP and pylon weight and we are talking about average subsonic speeds with very little close combat relevance.

So we are not simply losing "some" agility. We are losing "all" agility.

No matter how small LCA's RCS is, it is not stealth. It is not even close to LO.

 

[rahulrds1]

LCA- Counter measures.

CMDS- Counter measures dispensing system. I took these snaps in Defence Expo-2012.

Infrared countermeasure - Wikipedia, the free encyclopedia
Flare (countermeasure) - Wikipedia, the free encyclopedia

 

[vram]

It is DASH III.

wuh! just saw kunal's pics. Dampener. I read somewhere that the Samtel JV will be producing the HSMD for tejas. Must have been a probability for the LCA 2 then....

 

[vram]

Tejas R-73 Missile firing with Help Of DASH HMDS..

What is that weird gluey thingy that runs in a dual line at the top of the cockpit glass dome?? Does seem to compromise on visibility for quick spotting a bit....

 

[opesys]

What is that weird gluey thingy that runs in a dual line at the top of the cockpit glass dome?? Does seem to compromise on visibility for quick spotting a bit....

I think it is for shattering the glass during ejection...

 

[vram]

I think it is for shattering the glass during ejection...

YES...Just read up a bit more on it. Looks like a strip of explosive material that will split the canopy wide at the time of pilot ejection. It appears to be called Canopy Shatter System.
found the link from DRDO explaining this system in below URL

DRDO

Also just realized this...that I am suffering restricted view in that angle because of the camera location which is at the back of the pilot LOL. This thingy is right over the pilots head so he wont have such problem.

But man does it look ugly.... why can't they have used some other option..like blowing of the whole glass dome,..

 

[sayareakd]

I think it is for shattering the glass during ejection...

It was discussed at BR

Canopy Severance System for fighter air craft

The Canopy Severance System (CSS) of a fighter aircraft is life saving device that helps in safe ejection of a pilot in distress. Two critical components required for functioning of CSS, MDC for cutting canopy bubble and Explosive transfer line (ETL) for transmission of explosive shock from one point to another without affecting surroundings were developed and their production methods established. MDC and ETL function with a velocity of detonation of 6000 m/s ensuring that the cutting action of the Canopy occurs in less than 5 m sec from the time of initiation. Afterthe successful development of this system, the import option of CSS for LCA by ADA was dropped. LCA TD-1,TD-2 and PV-1 have been assembled with indigenous CSS. An upgraded system developed for HJT-36, a trainer aircraft, after successful evaluation has been assembled on the first prototype of HJT-36 that has been in flight since February 2003.

According to scientist Dr K S Rajgopal, head of the weapons system, ARDE, the Canopy Severance System could be operated by an external initiator.

"The initiator generates a detonation wave which is transmitted in a totally contained manner to a line charger pasted along the canopy and thus cutting it peripherally. This helps in rescuing the pilot," he explained.

Salwan said after the new system was tested at Martin Bakers, UK, recently, it had been approved for use in the LCA. Two LCAs fitted with the system were already in operation for the Indian Army, he disclosed, adding that army authorities were satisfied with its functional operation.

Pointing out that the minimum time in the range of milliseconds should be used in saving the pilot in distress, he pointed out that while the conventional ejection system was 95 per cent successful, the new system would take it to 99.9 per cent.

Salwan said the system was fitted with sophisticated sensors to achieve the expected results as successfully demonstrated in the UK. He said the army chief, General Ved Prakash Malik, during his recent visit to the ARDE was fully satisfied with the new system.

Rediff On The NeT: ARDE develops safe ejector system for LCA

 

[opesys]

YES...Just read up a bit more on it. Looks like a strip of explosive material that will split the canopy wide at the time of pilot ejection. It appears to be called Canopy Shatter System.
found the link from DRDO explaining this system in below URL

DRDO

Also just realized this...that I am suffering restricted view in that angle because of the camera location which is at the back of the pilot LOL. This thingy is right over the pilots head so he wont have such problem.

But man does it look ugly.... why can't they have used some other option..like blowing of the whole glass dome,..

HowStuffWorks "How Ejection Seats Work"

 

[sayareakd]

they could have done better job them just putting explosive charge on the glass canopy

I believe if the things is worth doing then do it in best possible way.

 

[vram]

they could have done better job them just putting explosive charge on the glass canopy

I believe if the things is worth doing then do it in best possible way.

Yes well I just got some other aircraft having the same kind of strips in the internet like the Tornado.. .google image search has many...But all seem have them pasted on in a proper line like done by a machine for some frame beading...a bit more professional...which is while not appealing definitely improves the look a bit. But I guess functionality over aesthetic value for the LCA eh? Hope production variant has this applied in a better manner.
I did read the article provided by @opesys .But am still not convinced why the side blowing mechanism with hidden charges cannot be used. No matter in what angle the pilot ejects the sideblowing will still ensure the canopy debris is outside the pilots ejection danger zone.

 

[rahulrds1]

 

[rahulrds1]

2011 news about LCA ejection system,

Tejas pilots can eject within 20 milliseconds!
DRDO labs ARDE and HEMRL develop superior pilot safety mechanism
Thursday, 20 January 2011 - 12:21 PM IST

PUNE: Pilots, who will eventually fly the indigenously developed country's first Light Combat Aircraft (LCA) 'Tejas', will be able to eject out of the aircraft in case of an emergency within 20 milliseconds. Older systems take almost 1,000 milliseconds before ejection kicks in.

This has been made possible by two city-based Defence Research and Development Organisation's (DRDO) labs -- the Armament Research and Development Establishment (ARDE) and High Energy Materials Research Laboratory (HEMRL) -- using the Canopy Severance System (CSS).

"During an emergency, it is required to ensure the safety of the pilot in the shortest possible time. This is as true for a aircraft in flight as it is for one on the ground. For this purpose, other aircrafts have a mechanism called 'jettisoning of canopy' which takes longer operational time in the order of a few seconds as they are mechanical based systems," DRDO spokesperson Manish Bharadwaj said.

When the canopy is jettisoned, the entire canopy flies off and can result in an injury to the pilot. In the indigenously developed CSS, only a certain portion of the canopy gets severed explosively, thereby helping the pilot to eject safely with minimum injury during flight.

"The CSS for Tejas aircraft is based on high explosive. It can also be operated from outside the aircraft, especially when the pilot is unconscious due to some injuries or in the event of a crash landing," Bharadwaj added.

Aeronautical Development Agency (ADA) has started the Light Combat Aircraft (LCA) programme in collaboration with Hindustan Aeronautical Limited. ADA, had approached ARDE and HEMRL for development of CSS. After completing the feasibility study for the development of CSS, ARDE and HEMRL started working on this system in the year 1992.

"This system has been developed using technologies available in India. Therefore, it is cost effective. A number of lessons learned during the development of CSS for Tejas have been implemented in developing CSS for other aircrafts such as the LCA-Trainer and the Intermediate Jet Trainer," the DRDO spokesperson elaborated.

HIGHLIGHTS

- Works faster than the jettisoning of canopy system
- Based on high explosive
- Can be operated from outside the aircraft
- Expected to improve pilot safety substantially

Tejas pilots can eject within 20 milliseconds! | Sakal Times!

 

[sayareakd]

those glass parts can cause damage to pilots eyes, frame 0.48, glass are all over the place.

 

[rahulrds1]

point !...

LCA pilot Helmet will protect pilot's eyes while ejecting.

 

[sayareakd]

point !...

LCA pilot Helmet will protect pilot's eyes while ejecting.

I am not talking about LCA with glass helmet, i was talking about that video.

 

[shuvo@y2k10]

magestic lca tejas in action pics