Bharat Rakshak

maitya

Some more confirmations - and now timelines as well: Contract for three more Scorpene submarines likely by end-2024; first delivery expected by 2031 The contract is expected to be concluded by end next year and delivery of the first submarine is expected by 2031 . If a proven, functional Air Indepen...

maitya

Maitya ji, can you please help us understand that if we had already involved Safran for Kaveri earlier and now with even new JV, why GTRE is approaching russian institutes for flight testing? Is it bcoz it is comparatively cheap by considerable margin? Your question is why we are going to GromovFRI...

maitya

https://twitter.com/alpha_defense/status/1683354042020556800?s=20 ---> Kaveri Engine to undergo flight testing at GFRI*, Russia in Q-2 2024. *Gorom Flight Research Institute Oh Man, Oh Man, Oh Man ... more details pls (G9 or any other version?). :twisted: :twisted: And where's that lungi-dance emot...

maitya

^Jits would strongly suggest, pls remove the details of this news item and maybe leave the url and headline of it.
It's a comic relief though ...

maitya

https://twitter.com/BharatShaktiBSI/status/1681312926026825732?s=20 ---> It is not a done deal yet, but all indications are that Safran Aircraft Engines of France, is confident of powering India's future helicopters and AMCA over the next 15 years. BharatShakti Editor-in-Chief, Nitin Gokhale visite...

maitya

Maitya-ji, I know you will take offense to the tweet below :) https://twitter.com/nitingokhale/status/1679932691435667464?s=20 ---> As @PMOIndia sits down for dinner with President Macron, there will be satisfied faces on both sides on conclusion of truly pathbreaking outcomes. For me, the announce...

maitya

Ahead of PM Modi’s visit, France offers to co-develop engine for combat jets https://www.hindustantimes.com/india-news/india-drdo-frances-safran-jointly-manufacture-certify-engine-amca-combat-aircraft-emmanuel-macron-101688259382106.html 02 July 2023 The knives are already out, post the publication...

maitya

maitya, great post. If and when, a new engine thread is started...I am going to be leaning on you to provide the technical details (or the lack thereof). Based on your post above, please break down those future posts into two sections; 1) Simple English For Mango Abduls (like me). The viability of ...

maitya

<snip> Ahead of PM Modi’s visit, France offers to co-develop engine for combat jets https://www.hindustantimes.com/india-news/india-drdo-frances-safran-jointly-manufacture-certify-engine-amca-combat-aircraft-emmanuel-macron-101688259382106.html 02 July 2023 The Emmanuel Macron government gave green...

maitya

<snip> Once a 110 KN engine is developed, a 414 equivalent can be done subsequently, should such a need arise. It will mean tech-development and tech-absorption at unprecedented levels and I hope HAL et al step upto it. A 4th Gen Turbofan of 60-62KN/98KN thrust-class (like F414) can be be developed...

maitya

Let me start with saying I have very little knowledge of engine or manufacturing tech, it challenges etc. (though I am an engineer by education -with 0 industry experience). <snip> 3.An exception to the above is the Jaguar Adour engines, we assembled them, now we are in position to make a similar e...

maitya

[Part - nn+1] As I’ve said in one of my previous posts, Superalloy design is an iterative process and is absolutely dependent upon level (both depth and breadth) of actual-usage data availability . GE, with it’s phenomenal reach (and diversity) of gas turbine applications across the globe, knew 2 o...

maitya

@ Maitya-ji: Check this out... https://twitter.com/VishnuNDTV/status/1671050949996032001?s=20 ---> For those wondering, DMRL (Defence Metallurgical Research Lab) has produced Directionally Solidified and Single Crystal Turbine Blades & Vanes - Can this technology be adopted for use on F-414s as...

maitya

@ Maitya-ji: Check this out... https://twitter.com/VishnuNDTV/status/1671050949996032001?s=20 ---> For those wondering, DMRL (Defence Metallurgical Research Lab) has produced Directionally Solidified and Single Crystal Turbine Blades & Vanes - Can this technology be adopted for use on F-414s as...

maitya

Bharat Karnad is obviously wrong ... GE is not transferring > 80% of design and manufacturing tech that goes into F414 - SKD assembly and some system level testing (with the acceptance data also provided by OEM) is not == the tech involved in design, development, certifying and mass-manufacturing o...

maitya

the single-crystal turbine blades tech is already available with us and we are using it in an engine that is being made here. Don't know what percentage of indigenization has been achieved in the overall engine per se or even in the single-crystal blade itself. Both, the engine and the single-cryst...

maitya

It appears that the US has provided the executive approvals for the GE HAL engine deal and now the process of notifying the US Congress has been started. That should take another 30 days, after which the deal is as good as done. US seals key jet engine deal ahead of Modi's visit to USA Normally, wo...

maitya

... Rakeshji (or any mod), is there a way you guys can rectify some typos in the last few posts (in my reply to Pratyush ji above and to the Part-2 post etc) - just wanted to make them as accurate as possible. Saar, you can edit your own posts. Go to your post in question and right next to your use...

maitya

Rakeshji (or any mod), is there a way you guys can rectify some typos in the last few posts (in my reply to Pratyush ji above and to the Part-2 post etc) - just wanted to make them as accurate as possible. Pratyush-ji, there I'd compared the published rpm difference between the LP T C/FAN stages of ...

maitya

[Part-4: The LPT/FAN route] So anyway, back to the topic: what is the alternative wrt increasing thrust levels of a well-designed low BPR turbofan . <snip> 2) EJ2000 - future variant (Stage-2) Bhai, I absolutely know nothing about HPT and TBH, I could hardly grasp except it. That being said, I have...

maitya

Maitya, 1) In one of your posts above you have mentioned the difference between the RPM of both the 404 and the Kaveri. 2) one of the you tube defence channels has reported that GTRE has approached the MOD for approval for work on a 55 kn dry thrust kaveri. On the basis of the work done on the curr...

maitya

[Part-5: Epilogue] I think I have written enough - and didn't even get into a few other aspects like Combustor efficiency, NGVs etc. Summary of course is, it's very difficult, costly and time-consuming effort, to just take a core of an already-designed turbofan and trying to tinker it to produce ge...

maitya

[Part-4: The LPT/FAN route] So anyway, back to the topic: what is the alternative wrt increasing thrust levels of a well-designed low BPR turbofan . Well, pls refer to the 1st line of the post i.e. generally for a low-BPR military turbofan, approx 70-75% of max dry-thrust would normally come from t...

maitya

[Part-3: HPC PR Improvement via Aerodynamic route] Now let's come back to pt 1b3 - i.e. increasing the Pressure Ratio of HPC by increasing its efficiency via improvements to aerodynamic design of the HPC stages. Now this can be done, via multiple ways, but none of them are easy and none, for a well...

maitya

[Part-2: HPC PR Improvement] Anyway, coming back to the topic, increasing the Pressure Ratio of HPC is achieved by either, 1b1) simply adding an HPC stage - of course, that'll have weight penalties and is basically a complete redesign of the core or 1b2) achieving higher RPM of the HPC stages (and ...

maitya

[Part-1: Introduction] (It'd have been much easier if I'd known how to create tree structure etc in the forum software and depict the following pictorially - but no joy there) There're no hard-and-fast rule, but generally for a low-BPR military turbofan, approx 70-75% of max dry-thrust would normal...

maitya

<snip> Enqyoob can correct me but a core can deliver only so much. It's a function of diameter, length (stages), and Temperature. <snip> Ofcourse the grand-mullah Enqyoobdin Gas-turbini (PissBUH), knows the most, but normally yes, there're are limits to how much a core can be tweaked to deliver mor...

maitya

Per a Defence AV channel the F414 engine production in India would start with indigenization level of 60% in the 1st year and will top out at 75% at the end of the 10th year. so the screw drive /assembling demonstration can and will come to a halt at any time. Yes, yes, yes of course ... Joining a ...

maitya

https://twitter.com/seemasirohi/status/1662853323773423627?s=20 ---> The GE engine deal is mostly done. It’s a big deliverable for Modi’s state visit. My take: https://twitter.com/cheraputra/status/1663037558761336833?s=20 ---> Do you really believe this stuff? LOL. There's no way they'd share such...

maitya

:mrgreen: :mrgreen: :mrgreen: Refer to the last line of my prev post, and maybe think thru a bit :mrgreen: :mrgreen: :mrgreen: Hint: One way of doing so, is to randomly choose a major subsystem, say (just purely as an example) HPT. Now if you search around carefully for 1) What are it's major subco...

maitya

However, what I’m finding quite surprising (wrt whatever details have got published so far), why is HAL/MoD/IAF not insisting on indigenous sub-system level replacements , without sacrificing the overall engine warranties, after a few years of pure-and-simple screwdrivergiri. :roll: What subsystem ...

maitya

^^^^ Nothing more to add to what I've already posted above, based on these reports. This is a pure and simple ToAsT (Transfer of Assembly and Testing - I mean post-assembly testing) deal, being sold under the ToT mukhota. All that will happen is SKD (and maybe a few years later, CKD) level of Assemb...

maitya

@ Maitya-ji.... India soon to jointly manufacture jet engines for LCA Mk2 https://www.financialexpress.com/business/defence-india-soon-to-jointly-manufacture-jet-engines-for-lca-mk2-nbsp-3097873/ 22 May 2023 Rakesh saar, It does not automatically mean that critical and vital parts will be made here...

maitya

^^^ Ramanaji pls note, have attempted to respond in the Kaveri thread.

maitya

Effect of Serpentine Inlet on Fan design: The curved or twisted nature of the serpentine inlet duct causes distortions mainly in terms of the swirl angle of the incoming airflow (inflow incidence angle) and also wrt variations in the velocity and pressure distribution of the incoming airflow. The e...

maitya

And the second one from the same thread : I think many here are not reading the posts carefully enough ... so the questions, that have been already answered for, keep coming up. The current dry-Kaveri version is a K9 variant, and that is the only currently officially funded program (of Kaveri genre)...

maitya

Upping this thread with a cross-post from the LCA Mk2 thread : There are limited paths India can take now; * Import F414 turbofans directly from the US. More expensive route, but that is what is available. Your leverage is entirely in the US' hands. ..... * Get a clean sheet turbofan design (minimum...

maitya

I think many here are not reading the posts carefully enough ... so the questions, that have been already answered for, keep coming up. The current dry-Kaveri version is a K9 variant, and that is the only currently officially funded program (of Kaveri genre) in GTRE. This dry version of the Kaveri, ...

maitya

There are limited paths India can take now; * Import F414 turbofans directly from the US. More expensive route, but that is what is available. Your leverage is entirely in the US' hands. ..... * Get a clean sheet turbofan design (minimum a decade) and install it on the Tejas Mk2. Along this path, g...

maitya

So summarising desi turbofan design and development effort, we are at: 1) As we all know the Dry-Kaveri (for UCAV application) was based on baseline K9 version but with a new redesigned Fan . - Godrej was chosen to develop all the modules for 7-8 test engines required for certification of this engin...

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