ADA Tejas (LCA) News and Discussions

[lcafanboy]

Here DFCC stands for digital flight control computer..

 

[Enquirer]

Here DFCC stands for digital flight control computer..

I knew what DFCC meant, but presumed that the tender (not having access to it) was pertinent to frame that holds all the sensors that DFCC is connected to.

But if they're changing just the box housing the computer, it's all the more curious! Hasn't this been flight tested and approved already? Isn't HAL already assembling this stuff to go into 2 operational squadrons? Are they changing the fight computer hardware it houses also?

I am confused!!!

If this tender is to test/modify/iterate (including flight test) the DFCC cover plates, then it's not a reason to cheer for Mk1A - because that means Mk1A is pretty far out time wise.

Would you be willing to share the entire tender document? Thanks.

Or maybe it's as benign as reducing the number of fasteners on the plates (I had heard that part of the rearrangement of LRUs was to economize the total number of fasteners used)

 

[Saichand K]

Perhaps it is part of weight reduction measures.

 

[patriots]

'Tejas' over the Jaisalmer Fort - A great click! Copyright: Cdr S Dahiya

 

[shankyz]

Tejas @ IAF Sulur Base

 

[Aman kumar]

ADE has issued a tender for Tejas MKIA DFCC Chassis Assembly. The tender opens by end august and first unit to be supplied in 3 months from date of contract

The fabrication of the chassis has to be carried out in Three Stages, based on the following Terms &
Conditions:
1) FIRST UNIT - PROTOTYPE UNIT (01 No.)
• The first prototype unit shall be fabricated using the first set of chassis component drawings released
and approved by ADE.
• The first prototype unit shall be delivered within 03 months from the date of placement of
order/contract.
• Depending on the outcome of the fabricated components and results of the preliminary assembly
tests and checks, the second set of drawings will be released with modifications (if required).
2) SECOND UNIT - QUALIFICATION TEST (QT) UNIT (01 No.)
• The second unit, which will be the Qualification Test (QT) unit, shall be fabricated from the modified
set of drawings approved and released by ADE.
• The QT unit shall be delivered within 03 months from the date of receipt of the modified drawings. T0
for the QT unit starts from the date of receipt of the modified drawings from ADE.
• Based on the Qualification Tests of the QT unit carried out in ADE in collaboration BEL Bangalore,
the third set of components drawings will be released (if required).
3) THIRD, FOURTH & FIFTH UNITS - FLIGHT WORTHY UNITS (03 Nos.)
• 03 numbers of Flight Worthy units shall be fabricated from the final modified set of drawings
approved and released by ADE. T0 for these three units starts from the date of receipt of the
modified drawings from ADE.
• These units shall be delivered together within 04 months from the date of receipt of the final modified
drawings.
• These final flights worthy units will accepted based on the mechanical inspection reports and
Qualification Tests results carried out in ADE in collaboration BEL Bangalore.
ADE has the right to short-close the demand, in case the design requirement of fins with 0.4mm or lesser
thickness (as mentioned in Annexure 'A') is not achieved even after the Second Unit (QT Unit) is fabricated.
4) Detailed drawings shall be obtained from ADE against Non Disclosure Agreement for details refer
1.1, Part 1(A) of RFP at Page No. 3.

Mk1A coming

It can cause more delays...
I heard Mk1a was just mk1 with aesa and spj with reduced weight and relocation of LRUs

 

[HariPrasad-1]

Kaveri is 81-84kN with flat rating and variable cycle. Flat rating means that the thrust is deliberately reduced to maintain a flat peak thrust across altitude and variable cycle means that te bypass is changeable. So, 81-84kN would mean 100kN in normal terms. Why are you ignoring flat rating and variable cycle? WHat kind of engine ever uses bypass ratio of just 0.16? 03-05 is the standard bypass and 0.16 is only the least bypass value.

Impressive. Can you explain this in greater detail?

 

[Enquirer]

The TWR of engine is also about fuel consumption, optimal thrust for weight class of plane etc to optimise range. Bigger engine means smaller fuel tank in the plane, thus lower range. Bigger engine consumes more fuel for sustaining itself and hence more fuel wasted to sustain itself rather than propel the plane. The fuel conumption per unit thrust goes up even though TWR stays same as more fuel is needed to maintain engine due to overall increase in dimensions and moving parts

So, you don't approve Tejas being fitted with F414 in Mk2! You prefer Mk2 remain at 84KN of F404.

(It was my mistake to click on 'Show ignored content' - & all I see is crap!)

 

[Enquirer]

Kaveri is 81-84kN with flat rating and variable cycle. Flat rating means that the thrust is deliberately reduced to maintain a flat peak thrust across altitude and variable cycle means that te bypass is changeable.

Kaveri is NOT a variable cycle engine.

 

[Saichand K]

Kaveri is NOT a variable cycle engine.

"The Kaveri engine has been specifically designed for the demanding Indian operating environment, which ranges from hot desert to the highest mountain range in the world. Its design is a variable-cycle, flat-rated engine and has 13 percent higher thrust than the General Electric F404-GE-F2J3 engines equipping India's Tejas prototypes.[34] The GTRE's design envisions achieving a fan pressure ratio of 4:1 and an overall pressure ratio of 27:1, which it believes will permit the Tejas to "supercruise" (cruise supersonically without the use of the afterburner)".

Source: Kaveri via drdo.gov.in

https://www.drdo.gov.in/drdo/English/index.jsp?pg=kaveri-new.jsp

 

[Enquirer]

"The Kaveri engine has been specifically designed for the demanding Indian operating environment, which ranges from hot desert to the highest mountain range in the world. Its design is a variable-cycle, flat-rated engine and has 13 percent higher thrust than the General Electric F404-GE-F2J3 engines equipping India's Tejas prototypes.[34] The GTRE's design envisions achieving a fan pressure ratio of 4:1 and an overall pressure ratio of 27:1, which it believes will permit the Tejas to "supercruise" (cruise supersonically without the use of the afterburner)".

Source: Kaveri via drdo.gov.in

https://www.drdo.gov.in/drdo/English/index.jsp?pg=kaveri-new.jsp

It's up to you to believe in whatever you feel like - VariableCycle, SuperCruising etc etc.
DRDO has a big mouth; always likes to speak in aspirations while leaving others in perspirations!!

 

[Kshithij]

So, you don't approve Tejas being fitted with F414 in Mk2! You prefer Mk2 remain at 84KN of F404.

(It was my mistake to click on 'Show ignored content' - & all I see is crap!)

F414 has only 4% increase in weight over F404 and the thrust is increased by 13% while size remains constant. I don't see how it compares toy your 20% increase in weight and 20% increase in thrust while the size increases due to addition of stages.

(I really did not want to reply to your foolish posts but since this is a public forum, I just wanted to clarify to public)

 

[Saichand K]

It's up to you to believe in whatever you feel like - VariableCycle, SuperCruising etc etc.
DRDO has a big mouth; always likes to speak in aspirations while leaving others in perspirations!!

The same goes for you as well...

 

[Skdas]

It's up to you to believe in whatever you feel like - VariableCycle, SuperCruising etc etc.
DRDO has a big mouth; always likes to speak in aspirations while leaving others in perspirations!!

I think GTRE has more street cred than any of us discussing things here. They put money where there mouth is and build physical stuff. Maybe they are a bit late in delivering but they come through...

My few cents. You , or anyone else for that matter, can choose to believe otherwise.

 

[Enquirer]

The same goes for you as well...

Sure, I'll believe in what I feel is factual, logical & scientific!

 

[Enquirer]

I think GTRE has more street cred than any of us discussing things here. They put money where there mouth is and build physical stuff. Maybe they are a bit late in delivering but they come through...

My few cents. You , or anyone else for that matter, can choose to believe otherwise.

The proverbial 'putting money where their mouth is' doesn't apply to the entire DRDO org (including GTRE)...that is the quintessential bane of government run research labs.
They're not accountable to shareholders or anybody else. They make outlandish claims all the time. Despite how much everyone loves to bash the armed forces (they do deserve some part of it), DRDO doesn't shine that well when it comes to competence, reliability etc.
Even though I disagree with Matheswaran's decree that Tejas should be shut down (back in 2015), the criticism he levels on DRDO (like DRDO folks felicitating themselves for no real achievement etc) is bang on target! Very often they use superlatives very loosely, and claim technical conquests when they haven't-it's like they get to Mt.Everest base camp (or worse just buy a ticket to Lukla) and then they claim they've summitted !!

 

[Kshithij]

Seems like when you were developing as an embryo, you were only able to grow a rectum and nothing else about you!!
Because only a confirmed rectum would say shit like that.
Fuel consumption rate of F414 is much higher than F404! Requires higher intake of air for that purpose - for which Tejas Mk2 had to design bigger air intake ducts!
Rectums can't read or understand, but are ready to crap all over!
That said, the rectum that you are haven't understood the very premise of the entire debate -which revolves around what compromises are rational.
So shut the F up - meaning close your a'hole!

Moron, the F414 has same SFC as F404 which means that the fuel consumption per kN-h is same. Now, since F414 has higher thrust, it consumes overall fuel higher but not per unit thrust. When you add extra stages, the functioning of these will reduce SFC as well as increase engine size which in turn will reduce fuel tank size.

Now shut your anus and stop irritating me.

 

[WolfPack86]

DRDO lab ADE has issued tender for fabrication of parts for LCA mk1A. Delivery period is 14 Months from the effective date of contract.

 

[Saichand K]

Sure, I'll believe in what I feel is factual, logical & scientific!

What are those facts and how do u support ur facts. What are ur sources in that regard?

 

[Saichand K]

How do I prevent some nuisance elements from viewing my posts & responding to it?
Is there a traditional block feature? Ignoring doesn't prevent the nuisance elements from gnawing at your posts!
Thanks.

By not posting in forums and writing ur own blogs but in private setting.