LCA TEJAS MK1 & MK1A: News and Discussion

[IndianHawk]

????? What you even mean by this???

We need a low bypass engine. Fighters all over world use low bypass engine.

I mean it's way too low for kaveri compared to ge404.
F404 has a bypass ratio of 0.34 while f414 has 0.25
M88 has 0.30
Compared to 0.16 for kaveri.

Back in 1980s ge404 was the most advanced engine for light / medium fighters in the world. So we tried to match the thrust of gef404 while compromising on fuel efficiency. ( As we couldn't match both )
A concept of leaky turbojet. Which is as good as a turbofan but not as advanced or fuel efficient as western contemporary turbofans .

See both f404 and m88 have almost double the bypass ratio of kaveri and both are most fuel efficient engines in their class.

At least this is my understanding . I could be wrong on this though so don't take it seriously.

 

[ashdoc]

IAF's 18 Squadron with LCA Tejas to be operational on May 27 at Sulur

The 18 Squadron was formed on April 15, 1965 with the motto 'Teevra aur Nirbhaya' meaning 'Swift and Fearless'.Tejas is an indigenous fourth-generation tailless compound delta wing aircraft

www-livemint-com.cdn.ampproject.org

Guys what are capabilities of plain tejas mk 1?.....not mk 1a mind you.

 

[Bleh]

IAF's 18 Squadron with LCA Tejas to be operational on May 27 at Sulur

The 18 Squadron was formed on April 15, 1965 with the motto 'Teevra aur Nirbhaya' meaning 'Swift and Fearless'.Tejas is an indigenous fourth-generation tailless compound delta wing aircraft

www-livemint-com.cdn.ampproject.org

Guys what are capabilities of plain tejas mk 1?.....not mk 1a mind you.

Read the wiki page. Meticulously inserted everything, every faeture & achievements in there.
Updated the images too... Today only.

 

[Akula]

Read the wiki page. Meticulously inserted everything, every faeture & achievements in there.
Updated the images too... Today only.

Bleh please edit Indian army equipments page on Wiki. Someone has fu**ked up the page. Akash range has been changed to 100km.

 

[Bleh]

One thing that genuinely confuses me about Tejas is its turning. How come the pilots keep doing turns upon turns, without any noticeable performance detrimention?.. I understood that deltas tend to lose energy faster.

Someone explain plz. There was a rant about F-16's STR few pages ago.

Bleh please edit Indian army equipments page on Wiki. Someone has fu**ked up the page. Akash range has been changed to 100km.

I'm not really aware of all the accurate data. @porky_kicker @Karthi. Little help?

 

[vishnugupt]

Read the wiki page. Meticulously inserted everything, every faeture & achievements in there.
Updated the images too... Today only.

You are a Man of Passion, I was about to tell you to upload Exact pic of LA-5017 but you know exactly where is LCA's heart lies. You know even the pulse of LCA fans. People like you are the reason that Tejas has survived all odds and ready to smash neighbouring borders. Best regards

 

[porky_kicker]

One thing that genuinely confuses me about Tejas is its turning. How come the pilots keep doing turns upon turns, without any noticeable performance detrimention?.. I understood that deltas tend to lose energy faster.

Someone explain plz. There was a rant about F-16's STR few pages ago.


I'm not really aware of all the accurate data. @porky_kicker @Karthi. Little help?

Upto 35 km

Different sources mention different ranges from 25 - 35 km

I will take the upper limit of 35 km

 

[Karthi]

One thing that genuinely confuses me about Tejas is its turning. How come the pilots keep doing turns upon turns, without any noticeable performance detrimention?.. I understood that deltas tend to lose energy faster.

Someone explain plz. There was a rant about F-16's STR few pages ago.


I'm not really aware of all the accurate data. @porky_kicker @Karthi. Little help?

Tejas demonstrated ,15-16 degree STR , minimum radius turn achieved 350 m. STR depends upon the corner speed also. The smooth manuvering of aircrafts is mainly because the pilots and tactics developer's studied the full potential of aircraft and designed manuvers according to the strength of Aircrafts . These figures will significantly reduce whenever they carry loads .

 

[Karthi]

One thing that genuinely confuses me about Tejas is its turning. How come the pilots keep doing turns upon turns, without any noticeable performance detrimention?.. I understood that deltas tend to lose energy faster.

Someone explain plz. There was a rant about F-16's STR few pages ago.


I'm not really aware of all the accurate data. @porky_kicker @Karthi. Little help?

18 Km* 30 Km .please search for test results from pib may be helpful .

 

[Bleh]

Tejas demonstrated ,15-16 degree STR , minimum radius turn achieved 350 m. STR depends upon the corner speed also. The smooth manuvering of aircrafts is mainly because the pilots and tactics developer's studied the full potential of aircraft and designed manuvers according to the strength of Aircrafts . These figures will significantly reduce whenever they carry loads .

Doesn't answer my question though. It goes on doing turns like that at completes all of them in 19-22 sec!.. How does that not decrease as many claim how deltas lose enerhy in repeated turns?
Is it due to the optimisations?.. I read in some interview that it doesn't have to be in a specific part of the envelope to perform its best, but tuned to minimise performance fluctuations with altitude & speed.

Anybody actually knows?.. or can ask HVT or AK?

How come the pilots keep doing turns upon turns, without any noticeable performance detrimention?.. I understood that deltas tend to lose energy faster.

 

[Super lca]

Tejas demonstrated ,15-16 degree STR , minimum radius turn achieved 350 m. STR depends upon the corner speed also. The smooth manuvering of aircrafts is mainly because the pilots and tactics developer's studied the full potential of aircraft and designed manuvers according to the strength of Aircrafts . These figures will significantly reduce whenever they carry loads .

Is the str improved in the foc version?

 

[Karthi]

Doesn't answer my question though. It goes on doing turns like that at completes all of them in 19-22 sec!.. How does that not decrease as many claim how deltas lose enerhy in repeated turns?
Is it due to the optimisations?.. I read in some interview that it doesn't have to be in a specific part of the envelope to perform its best, but tuned to minimise performance fluctuations with altitude & speed.

Anybody actually knows?.. or can ask HVT or AK?

Asking HVT will be the best cos he is a pilot and flown Tejas . Are you asking about energy manuverablity , then again the entire Manuvers designed to utilise the energy and minimise the energy bleed. Pilots usually have these charts , its almost impossible for civilians to get access on those doc's .

You will get basics of energy manuverablity here .

Aircraft Energy - maneuverability

There are five main things a pilot must remain aware of when contemplating aerial engagement, of which, getting sight of your opponent and keeping sight of them are the most important. Other major...

fullafterburner.weebly.com

 

[Karthi]

Is the str improved in the foc version?

STR is same not sure though, but Test pilots demonstrated more than what is allowed , it certainly not recommended cos it affects the airframe life .

 

[Karthi]

Light aircraf

Doesn't answer my question though. It goes on doing turns like that at completes all of them in 19-22 sec!.. How does that not decrease as many claim how deltas lose enerhy in repeated turns?
Is it due to the optimisations?.. I read in some interview that it doesn't have to be in a specific part of the envelope to perform its best, but tuned to minimise performance fluctuations with altitude & speed.

Anybody actually knows?.. or can ask HVT or AK?

Light aircraft bleed energy slowly and gain energy slowly , heavy fighters can bleed and gain energy quickly. If an Aircraft loose energy pilot can use another manuvering to gain the energy , in Dogfight a low energy state may be dangerous . Please read the article I posted above

 

[G10]

Light aircraf

Light aircraft bleed energy slowly and gain energy slowly , heavy fighters can bleed and gain energy quickly. If an Aircraft loose energy pilot can use another manuvering to gain the energy , in Dogfight a low energy state may be dangerous . Please read the article I posted above

Moment of inertia gone for a toss?

 

[ashdoc]

Read the wiki page. Meticulously inserted everything, every faeture & achievements in there.
Updated the images too... Today only.

Can you tell me whether the plain tejas mk1 can carry derby missiles and how many can it carry.

 

[Bleh]

Light aircraf

Light aircraft bleed energy slowly and gain energy slowly , heavy fighters can bleed and gain energy quickly. If an Aircraft loose energy pilot can use another manuvering to gain the energy , in Dogfight a low energy state may be dangerous . Please read the article I posted above

Not necessarily. F-18 is notorious for losing energy quickly & gaining slowly (from F-18 pilot on youtube). The Su-27 line is pretty draggy too.
On the other hand, Mirage-2000 is not that heavy...

Can you tell me whether the plain tejas mk1 can carry derby missiles and how many can it carry.

Max 4 without dual-racks. The outboard pylons should be able to carry Derby too but never seen such config.

 

[Chinmoy]

I mean it's way too low for kaveri compared to ge404.
F404 has a bypass ratio of 0.34 while f414 has 0.25
M88 has 0.30
Compared to 0.16 for kaveri.

Back in 1980s ge404 was the most advanced engine for light / medium fighters in the world. So we tried to match the thrust of gef404 while compromising on fuel efficiency. ( As we couldn't match both )
A concept of leaky turbojet. Which is as good as a turbofan but not as advanced or fuel efficient as western contemporary turbofans .

See both f404 and m88 have almost double the bypass ratio of kaveri and both are most fuel efficient engines in their class.

At least this is my understanding . I could be wrong on this though so don't take it seriously.

You have just considered a single aspect over here. When we say that BPR of Kaveri is lower then M88 of GE engines, it means the air flow around the core in Kaveri is less then compared to others. Now increasing the flow MIGHT result in a more fuel efficient engine, but no where it would help Kaveri in its core.

Now looking at the fuel consumption rate, we could see that SFC of Kaveri in dry thrust is better then F 404 and at par with M88 i.e 0.78 lb/lb.h. Whereas in F-404 the military thrust SFC is of 0.81 lb/lb.h. The SFC of Kaveri increases during the wet thrust.

The most important aspect where Kaveri is lagging behind is in pressure ratio. Its pressure ratio of 21.5 is far behind the 24.5 and 26 of M88 and F-404 respectively. Unless we increase the pressure ratio, we can't expect to get the required thrust from the engine. Now interestingly the low BPR of Kaveri might be a plus point for a higher thrust. If you compare F-404 and F-414 BPR and pressure ratio, you would find that with a BPR of 0.25, the pressure ratio of F-414 is 30, which is way above then M88 and F-404. Its military thrust of 57 Kn is way above then 50 Kn of M88 and 49Kn of F-404.

So BPR wise, I believe Kaveri is just fine. We need to work on the entry temperature to increase the pressure ratio in turn to produce more thrust. Once we are able to do it, we could work on the BPR to make it more fuel efficient.

 

[Assassin 2.0]

No 18 Squadron "Flying Bullets" resurrected with the LCA Tejas.
The second squadron of Tejas fighters, to be based at Sulur in TamilNadu, will see these homegrown birds inducted tomorrow

.

 

[WolfPack86]

Indian Air Force operationalised 'Number-18 - Flying Bullets' squadron with #LCATejas at Sulur base near Coimbatore.