HAL Tejas | Updates, News & Discussions-[Thread 2]

[gslv mk3]

DREAM !!!

stop crying

 

[Hulk]

Canopy redesign of Tejas has substantially reduced the drag which shall result into 20% hike in trans-sonic acceleration and 2% hike in highest speed at sea level. Slashing of 800 KG weight is also planned. This to gather shall result into a huge improvement in MK1 Performance itself. Along with weight slash , Aerodynamic improvement and AESA, Mk1 itself shall be a very lethal fighter.

Too good to hear, any links?

 

[Water Car Engineer]

Seriously, where is SP2? How many were HAL supposed to hand over this year? 4???

 

[SR-91]

Tejas Mark 1-A Program will lead revival of Indigenous Jet Engine efence Analyst | idrw.org



TOTAL money spent on KAVERI engine is little more than 2100 crore.


Govt plans to approve Rs 2652 crore for

Follow up KAVERI ENGINE more than 80 kn.

 

[HariPrasad]

Too good to hear, any links?

Yes.

Pl find here with the link.

http://www.nal.res.in/cfdsympo/cfdf...rsonic drag of a generic Fighter Aircraft.pdf

The present supersonic wave drag reduction due to modified canopy has a huge impact on the performance of the aircraft. The wave drag reduction in the modified fighter is approximately 6% in supersonic region as compared to the base configuration which translates to a 20% improvement in transonic accelerations. Reduction in wave drag has improved the maximum level speeds of the modified fighter by 2%.

To sum up, following is the plan for MK1+

1) Aerodynamic improvement of 6% resulting in 20 % rise in trans-sonic acceleration and highest speed at sea level by 2%.
2) Removal of 300 KG dead weight and reduction of total weight by 800 to 1000 KG resulting in improvement of T/W ratio by at least 15% .
3) New AESA rada,
4) New avionics,
5) More fuel due to readjustment of LRUs and liberation of more space.
6) Newly designed air intake.
7) More agility, More speed.
8) New EW suite.

In short MK1+ will meet all staff requirements in most of of the area and exceed in many area such as AESA and EW.

 

[GORKHALI]

Yes.

Pl find here with the link.

http://www.nal.res.in/cfdsympo/cfdfullpaperfinal/Influence of Canopy shape on the supersonic drag of a generic Fighter Aircraft.pdf

The present supersonic wave drag reduction due to modified canopy has a huge impact on the performance of the aircraft. The wave drag reduction in the modified fighter is approximately 6% in supersonic region as compared to the base configuration which translates to a 20% improvement in transonic accelerations. Reduction in wave drag has improved the maximum level speeds of the modified fighter by 2%.

To sum up, following is the plan for MK1+

1) Aerodynamic improvement of 6% resulting in 20 % rise in trans-sonic acceleration and highest speed at sea level by 2%.
2) Removal of 300 KG dead weight and reduction of total weight by 800 to 1000 KG resulting in improvement of T/W ratio by at least 15% .
3) New AESA rada,
4) New avionics,
5) More fuel due to readjustment of LRUs and liberation of more space.
6) Newly designed air intake.
7) More agility, More speed.
8) New EW suite.

In short MK1+ will meet all staff requirements in most of of the area and exceed in many area such as AESA and EW.

Sounds great so Is this proposed by NAL or ADA ?

 

[SR-91]

mera sundar sapna tooooooooooooooooooot gayaa !!!

We broke ur sapnaaaaaaa

 

[calmDown@all]

Please continue all discussion from this thread here.
HAL Tejas | Updates, News & Discussions | Page 689

Anyone have any numbers on projected life cycle cost of Tejas?

Developmental cost of Light Combat Aircraft (LCA), Tejas is Rs.7965.56 Crore ($1.09 Billion) including building of 15 aircraft and creation of infrastructure for production of 08 aircraft per annum. This compares with the developmental cost of JAS 39 NG Grippen is $1.80 Billion for developing 5 Proto Vehicles.


LCA, Tejas has approximately 60% indigenous content. As a result, production cost as well as life cycle cost of LCA Tejas will be comparatively lower to that of any other comparable class of aircraft.

The breakup of LCA, Tejas and its Naval variants is as follows:

Programme

Cost (Rs. in Crore)

Light Combat Aircraft (LCA) Phase-I

2188.00

Light Combat Aircraft (LCA) Phase-II

5777.56

Light Combat Aircraft (LCA) Phase-III

2431.55

LCA Navy Mk-1

1714.98

LCA Navy Mk-2

1921.11

 

[vayuu1]

Developmental cost of Light Combat Aircraft (LCA), Tejas is Rs.7965.56 Crore ($1.09 Billion) including building of 15 aircraft and creation of infrastructure for production of 08 aircraft per annum. This compares with the developmental cost of JAS 39 NG Grippen is $1.80 Billion for developing 5 Proto Vehicles.


LCA, Tejas has approximately 60% indigenous content. As a result, production cost as well as life cycle cost of LCA Tejas will be comparatively lower to that of any other comparable class of aircraft.

The breakup of LCA, Tejas and its Naval variants is as follows:

Programme

Cost (Rs. in Crore)

Light Combat Aircraft (LCA) Phase-I

2188.00

Light Combat Aircraft (LCA) Phase-II

5777.56

Light Combat Aircraft (LCA) Phase-III

2431.55

LCA Navy Mk-1

1714.98

LCA Navy Mk-2

1921.11

I think there is a bit of problem in ur assessment, u have stated lca mk 2 to be about 5776 cr, while the stealthier version to be 2431 cr.

 

[PakEye]

We broke ur sapnaaaaaaa

Yeeaaaaahhhh the Interpretation is JF17 thunder

 

[HariPrasad]

Sounds great so Is this proposed by NAL or ADA ?

The paper is published by ADA.

Actually this was a part of optimization aerodynamics of MK2. Studies were carried on MK1 and this whooping 6% aerodynamic improvement found to be possible with Canopy redesign. This shall add to 20% improvement in Trans sonic acceleration. and 2% rise in highest speed at sea level along with the improvement in pitching stability characteristics. I think that now if engine integration and airintake redesign is taken care, MK1 in itself may emerge as a very potent fighter. I had read somewhere that Wing redesign is also planned. That will increase the strength of wing and reduce the weight as well. They are planning 800 to 1000 k G weight reduction which is a hike in 15% in T/W ratio. In all in all MK1+ shall emerge as a primer multiroll fighter and there is no doubt about that. There are some talks on single cheap guidance as well. This will reduce a lots of space to acomodate other stuff. 300 KG balancing weight shall be removed and landing gear will also be slimed .



Pl read this:

Conclusion The supersonic wave drag characteristics of a generic fighter aircraft was studied initially based on its cross sectional area distribution. Preliminary Sears-Haack shapes and equivalent body of revolution geometries indicated significant scope in wave drag reduction. The canopy region was identified for shape modification to reduce drag and various geometries were studied in RANS solver CFD++ constrained by seat & safety system, structural and manufacturing requirements to arrive at the best canopy shape. The final modified canopy gave 6% reduction in supersonic wave drag which translated to 20% improvement in transonic accelerations and 2% improvement in maximum level speeds. The pitching stability characteristics have improved in the modified fighter which results in less trim drag. The directional stability characteristics of the modified configuration has deteriorated resulting in lower cross over alpha which is proposed to be overcome by closed loop feedback control. This modified geometry also benefits with additional space in the aircraft behind the pilot that can be used to appropriately accommodate more internal fuel. Acknowledgement Preliminary area rule

http://www.nal.res.in/cfdsympo/cfdfullpaperfinal/Influence of Canopy shape on the supersonic drag of a generic Fighter Aircraft.pdf

 

[GURU DUTT]

Actually this was a part of optimization aerodynamics of MK2. Studies were carried on MK1 and this whooping 6% aerodynamic improvement found to be possible with Canopy redesign. This shall add to 20% improvement in Trans sonic acceleration. and 2% rise in highest speed at sea level along with the improvement in pitching stability characteristics. I think that now if engine integration and airintake redesign is taken care, MK1 in itself may emerge as a very potent fighter. I had read somewhere that Wing redesign is also planned. That will increase the strength of wing and reduce the weight as well. They are planning 800 to 1000 k G weight reduction which is a hike in 15% in T/W ratio. In all in all MK1+ shall emerge as a primer multiroll fighter and there is no doubt about that. There are some talks on single cheap guidance as well. This will reduce a lots of space to acomodate other stuff. 300 KG balancing weight shall be removed and landing gear will also be slimed .



Pl read this:

Conclusion The supersonic wave drag characteristics of a generic fighter aircraft was studied initially based on its cross sectional area distribution. Preliminary Sears-Haack shapes and equivalent body of revolution geometries indicated significant scope in wave drag reduction. The canopy region was identified for shape modification to reduce drag and various geometries were studied in RANS solver CFD++ constrained by seat & safety system, structural and manufacturing requirements to arrive at the best canopy shape. The final modified canopy gave 6% reduction in supersonic wave drag which translated to 20% improvement in transonic accelerations and 2% improvement in maximum level speeds. The pitching stability characteristics have improved in the modified fighter which results in less trim drag. The directional stability characteristics of the modified configuration has deteriorated resulting in lower cross over alpha which is proposed to be overcome by closed loop feedback control. This modified geometry also benefits with additional space in the aircraft behind the pilot that can be used to appropriately accommodate more internal fuel. Acknowledgement Preliminary area rule

http://www.nal.res.in/cfdsympo/cfdfullpaperfinal/Influence of Canopy shape on the supersonic drag of a generic Fighter Aircraft.pdf

thats great so will LCA also get DSI after its new intake design

 

[HariPrasad]

thats great so will LCA also get DSI after its new intake design

No DSI is a distance dream. It is an alien technology which only highly advance countries may have.

 

[GURU DUTT]

No DSI is a distance dream. It is an alien technology which only highly advance countries may have.

well we should ask US for it then

 

[HariPrasad]

By the time Mk1+ comes in, India and Israel would have developed a highly potent version of EW. Work is there in fast track. AOA would have passed 30* by than at least. All building blocks to make Tejas a very potent fighter are on. It is possible to surpass Grippen C with Tejas MK1+.

well we should ask US for it then

No US is not that Advance. US will take another 100 years to develop DSI.