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by maitya
07 Feb 2024 11:06
Forum: Military Issues & History Forum
Topic: Air Force Tejas Mk1A: News & Discussions: 02 January 2022
Replies: 855
Views: 2895522

Re: Air Force Tejas Mk1A: News & Discussions: 02 January 2022

Click on link below to see all the pictures that came with this twitter thread... https://x.com/Tanmaycoolkarni/status/1754730778628698297?s=20 ---> The Indian Air Force is all set to receive its first batch of Tejas Mk1A fighters this month, a superior version of the indigenous LCA Tejas. What's n...
by maitya
05 Feb 2024 16:38
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

[Hypothetical Kaveri Mk2 - Modelling Analysis - Part 4] Enter the Ver 3 ... But before we get to it, let's briefly analyse at very very high level, what GE did to evolve the F404 TF to F414 levels . The overarching aim for that program, was t o develop 20-25% thrust growth over the F404 levels, wit...
by maitya
05 Feb 2024 16:16
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

[Hypothetical Kaveri Mk2 - Modelling Analysis - Part 3] Now enter Ver 2(b). As I've said a gazillion times now, and is in fact a pretty well-known thumb rule wrt TF design, it's never a good idea to unilaterally increment either the TeT or the OPR . Doing so, the actual work extracted by the turbin...
by maitya
05 Feb 2024 15:57
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

[Hypothetical Kaveri Mk2 - Modelling Analysis - Part 2] Now for the Ver 2, and there are 2 of them (2a and 2b), with both assuming, GTRE/DMRL/MIDHANI et all have the achieved the required capability and technical maturity to implement an HPT turbomachinery capable of handling 1545-1550deg C level o...
by maitya
05 Feb 2024 15:43
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

[Hypothetical Kaveri Mk2 - Modelling Analysis - Part 1] Now, the Ver 1 column, assumes that we take the baseline K9, and only touch the LPT and the Fan/LPC, to improve the Fan/LPC PR levels moderately. Doing so, (pls refer to Rows 4-6) will improve the OPR obviously (from the Fan/LPC component - bu...
by maitya
05 Feb 2024 12:51
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

a few organizations in India are already doing this but one would hesitate to say if the technology has been mastered in a general way and therefore, is capable of being adapted to various engines under development or they are doing it from ready made kits which have all the materials required and ...
by maitya
01 Feb 2024 21:49
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

The IAF chief is reportedly confident that Indian can develop an indigenous GE F414 alternative. IDRW...so FWIW :) @ Maitya-ji: Take a bow :) IAF Chief confident that India can develop alternatives to the F414-GE-INS6 engine locally https://idrw.org/iaf-chief-confident-that-india-can-develop-altern...
by maitya
30 Jan 2024 21:54
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

maitya ji, Am I reading your postS right? That Safran/GE know more about GTRE than GTRE themselves? My impression about RR, WRT GTRE, is that RR is lost. NRao ji, I wouldn't go that far ... however having repeatedly being involved in consultancy, audit, critical component exports etc, they (specifi...
by maitya
27 Jan 2024 22:49
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

https://x.com/alpha_defense/status/1750854788319977744?s=20 ---> The French Government has submitted the roadmap for Jet Engine for the combat aircraft to the Indian MoD. https://x.com/alpha_defense/status/1750860951073771667?s=20 ---> * Joint IP (Yes) * Adaptive Cycle (No) <snip> All this joint-de...
by maitya
21 Jan 2024 16:19
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

https://x.com/alpha_defense/status/1747922517669597556?s=20 ---> GTRE has released an EoI (Expression of Interest) for the procurement of Ready To Fit, Equiaxed nickel alloy Low Pressure Turbine (LPT) rotor blades (450 qty) and Vane LPT sub assemblies (150 pairs) for a 80KN Engine by Indian Industr...
by maitya
17 Jan 2024 19:51
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Another, purely hypothetical option, is to increase the BPR without impacting the core mass-flow - which means catering for additional mass-flow at the Fan face itself but that would mean inlet design/dia etc change. Do note, in the F404 to F414 "evolution" GE did just that. (F414 fan is ...
by maitya
17 Jan 2024 12:41
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

... So low bypass ratio and increased mass flow rate are causing low TeT. Yet dry thrust is comparable in that class. Low BPR is for flat rating and am sure the other super duper engines become asthmatic in different airfields. So don't change it. What is the way to improve TeT for that holds the k...
by maitya
17 Jan 2024 00:14
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Since Kaveri almost achieved the required dry thrust and failed the wet thrust requirements, could the A/B issue be due to the low bypass ratio ? ie, could it be because not enough bypass cold air is going into the A/B section ? srin-ji, you know, I feel everything about Kaveri specifications were,...
by maitya
16 Jan 2024 20:48
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

https://idrw.org/indias-kaveri-engine-edges-closer-to-takeoff-from-dry-kaveri-to-kaveri-2-0-for-lca-tejas-mk1a-fleet/ Talks of a new after burner that'll take "kaveri 2.0" to get to a wet thrust of 83-85kn Our lurker is now looking at the after burner. Long ago in Aero Expo thread a cutaw...
by maitya
12 Jan 2024 20:47
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Ramanaji, I'll respond to you in a while ... however this is quite big:
Reg: SCB for Kaveri Dry Engine

However the SCB used in HAL helicopter HPT blades are solid (similar to those used in AL-31FP etc), so no great shakes ... but let's see!!
by maitya
08 Jan 2024 17:34
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Next set of questions: Why is the compressor efficiency so low? LPC, 85%, HPC 85% cited by GTRE. Those imply a polytropic efficiency under 88%, whereas textbooks in the 1980s cited 92%. What keeps our efficiency so low and have they not tried to boost that?" Ramanaji, here's a small comparo of...
by maitya
05 Jan 2024 10:58
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Maitya, A few questions from.an observer. 1) What is overall compressor efficiency at sea level standard MIL Thrust? 2) Why is stage pressure ratio so low (~1.4) if low pressure compressor and fan are transonic, shouldn't those be much higher? 3) What is the shaft rpm of the compressor stage ramana...
by maitya
03 Jan 2024 20:37
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Su-30 MKI as Kaveri Engine Test Bed - an idea from Air Cmde. Tapas Sen Shared by Shiv sir, I always thought of replacing one of engine of twin-engine aircraft to test the new engine but this is ingenious of using podded Kaveri engine at one of the hard points of fighter jet like Su-30. Looks viable...
by maitya
29 Dec 2023 09:55
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Yes, saw that news article as well, and no, I don't know much directly about part-replacement etc of the M53-P2s etc. However, technologically, there's nothing in M52-P2 that can't be manufactured here however, without OEM active participation and sharing of proprietary data etc, it'll not be possi...
by maitya
28 Dec 2023 16:05
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Maitya pls PM on how our engine tech is better than F404 in some aspects in plain english. Thanks. hgupta-ji, never a big fan of doing a "generic comparo" between various TFs as, 1) Most TFs are designed for their intended-application, so a lot of design decisions (read compromises) were ...
by maitya
27 Dec 2023 13:54
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Sir, I don't know whether this is the right place to ask, but am asking anyway. Recently DRDO has declared to work/replace some of M53 parts... With over 200 operating aircrafts, I doubt this has something to do with spare parts availability. I am sure we got approval and probably help from Snecma ...
by maitya
26 Dec 2023 22:38
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 2685
Views: 1019024

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

Afterall, anybody with any iota of even superficial understanding of operational constraints of putting a very high thrust class engine (say F414) into a lighter weight (say a 6T) platform , wouldn't have said so. And there are actual hints/allusions wrt this by various ultra-closely-associated-wit...
by maitya
21 Dec 2023 17:20
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 2685
Views: 1019024

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

Saar, I am not young like you! :) Can we please stop reducing the font sizes? Thank You. :rotfl: :rotfl: ... moi and young, oh boy!!! ... :rotfl: :rotfl: A Safran equivalent of the F414 would mean that the industrial offsets - from a MRFA contract - would be invested into a new generation turbofan ...
by maitya
18 Dec 2023 11:47
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 2685
Views: 1019024

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

Okay, so let us get this straight... ... ... <snip> So it took 6+ months - after the contract signing of the Tejas Mk1A - to sign the deal for 99 F404 turbofans. Now taking a look at the Tejas Mk2, it took approximately 13 months for the project to finally get going i.e. release of funds. And this ...
by maitya
27 Nov 2023 12:55
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 2685
Views: 1019024

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

Anyway, to conclude: But, actually, this so-called K9 failure, gave to the the-then import-pasand MoD-and-user-community-brass, the perfect opportunity to kill the indigenous TF program - which they swiftly and very successfully did. Their excuse ofcourse was, the time-tested, " operational re...
by maitya
27 Nov 2023 11:38
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 2685
Views: 1019024

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

In 2009, Tejas mk1 was deemed a complete failure without Kaveri and a new turbofan was needed. Tejas mk2 was sanctioned because a new turbofan means a new plane. With mk1a, the failure has been overcome. So Tejas mk2 necessity no longer exists . Now DRDO is trying to put cart before horse. Here too...
by maitya
13 Nov 2023 17:53
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

Alpha Defense is claiming some new angle on the Kaveri Engine development. I still don't understand the babugiri in engine development and counting paisa while the big picture is Bharat is on its way to becoming truly #3 in the world shortly. Big guy status requires big thinking and funding should ...
by maitya
18 Oct 2023 11:01
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

GE engine deal to help overcome striking tech gap, says HAL chief ... The deal will involve 80% transfer of technology (ToT) and is estimated to be worth around $1 billion . ... We are manufacturing the AL-31FP and Shakti engines under technology transfer which is not as exhaustive as what we will ...
by maitya
12 Oct 2023 11:26
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

https://x.com/DefenceDecode/status/1712077068299600305?s=20 ---> Defence Minister of India Shri Rajnath Singh at the Safran Aircraft Engines' Gennevilliers site where key parts of Rafale's M88 turbofans are produced. <snip> Interesting news - this Ginnevilliers site is where Safran recently (2019-2...
by maitya
30 Sep 2023 09:34
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 30 June 2022
Replies: 1108
Views: 596239

Re: Indian Missiles News & Discussions - 30 June 2022

In IITB, it was the Hawai chappal which you had to take in a bag with you otherwise it wouldn't last a minute. For a while I'd solved that problem by placing the slippers in separate places - left hawai in the shoe area + right hawai under one of those plastic bucket chairs. But people caught on......
by maitya
27 Sep 2023 15:10
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

I don't understand the timeline suggested for the indigenous 5th generation engine. Is the so called joint development going to be that much faster than a purely indigenous effort? Well, IMVHO it depends upon which OEM you are partnering with ... if the OEM (read GE) already has a host of 5th Gen t...
by maitya
27 Sep 2023 12:21
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

https://x.com/RETHIK5706/status/1705468486959390904?s=20 ---> DRDO Chairman Dr Samir V Kamat said, "Kaveri engine program is not a complete failure, during that time we didn't have expertise in predicting the thrust level of the engine during the designing phase itself, now this engine is plan...
by maitya
29 Aug 2023 21:06
Forum: Military Issues & History Forum
Topic: Military Multimedia - Indian Armed Forces
Replies: 2238
Views: 578229

Re: Military Multimedia - Indian Armed Forces

Don't know how to post videos etc ... but this video is one of the absolute stunners ...
by maitya
29 Aug 2023 21:02
Forum: Military Issues & History Forum
Topic: Air Force Tejas Mk1: News & Discussions: 02 January 2022
Replies: 808
Views: 509445

Re: Air Force Tejas Mk1: News & Discussions: 02 January 2022

Normally don't post pics and videos ... but just couldn't control myself on this video.
Stunning is the one word description ...
by maitya
16 Aug 2023 14:25
Forum: Military Issues & History Forum
Topic: Project 75I - It Begins
Replies: 1806
Views: 520831

Re: Project 75I - It Begins

^^^^^^
Right on cue:
Germany, Spain in contest for $4.8 billion Indian submarine

Nothing new in the news report, except for a new value ($4.8b) being quoted ... also no mention of VLS capability.
by maitya
16 Aug 2023 12:56
Forum: Military Issues & History Forum
Topic: Project 75I - It Begins
Replies: 1806
Views: 520831

Re: Project 75I - It Begins

=But then again not much makes any sense about this program anyway ... oh well!! :evil: ^^ a la Air Force to end up with a mish mash of Subs And a decade down the line all production lines will be kaput and we struggle for spares and maintenance And the Circus will continue!! The IN is looking for ...
by maitya
15 Aug 2023 17:13
Forum: Military Issues & History Forum
Topic: Project 75I - It Begins
Replies: 1806
Views: 520831

Re: Project 75I - It Begins

TKMS is the rumoured and favoured candidate to win. So, it'll be those 4K Ton Type-216 derivatives then ... can't be sub-2K Ton Type-214 or barely-2K Ton Type-218SG clone, as not sure without 4K Ton type displacement, how come any of the VLS capability can be implemented/incorporated. Or, has that ...
by maitya
14 Aug 2023 15:46
Forum: Military Issues & History Forum
Topic: Project 75I - It Begins
Replies: 1806
Views: 520831

Re: Project 75I - It Begins

IDRW is reporting. Hanwa, has withdrawn from the P75I project. Thought this was inevitable after Larsen and Toubro (L&T) going with Navantia and MDL with TKMS, there were no other Indian co left to partner with South Korean firms (Hanwa/Daewoo) ... though I'm not very sure if an Indian company ...
by maitya
26 Jul 2023 10:58
Forum: Military Issues & History Forum
Topic: Indian Navy News & Discussion - 12 April 2021
Replies: 1648
Views: 685696

Re: Indian Navy News & Discussion - 12 April 2021

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...
by maitya
25 Jul 2023 21:57
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 6363
Views: 1977640

Re: Kaveri & Aero-Engine: News & Discussion

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...