Bharat Rakshak

maitya

https://twitter.com/Varun55484761/status/1411352322542751744?s=19 Can someone please explain the significance of this blisk? These are cast as blisks for use in the STFE for the Nirbhay. I'm not even sure you can make a SC-blisk. Can it be done? Trouble with the answer to above, is it's not a overw...

maitya

India clears decks for long-pending mega project to build six new-gen stealth submarines https://timesofindia.indiatimes.com/india/india-clears-decks-for-long-pending-mega-project-to-build-six-new-gen-stealth-submarines/articleshow/83228646.cms Quick question: Is the mandate that the AIP to be used...

maitya

Prasad wrote:High hardness cores were done a few years ago.

Prasad, thanks for confirming.

Betw, IIRC there was another parallel program in DMRL wrt powder metallurgy based HIP processing for Core Die manufacturing - are you aware what happened to it?

maitya

DDM or real? I am going to go with the former. This is how HAL defines "ToT" :D https://twitter.com/strategic_front/status/1328963681686855685?s=20 ---> HAL's Koraput Engine Division makes the Su-30MKI's NPO Saturn AL-31FP engine from ground up, including the single crystal blades . The b...

maitya

<snip> Dr VK Saraswat heading the committees for the AMCA program and the turbofan that powers the AMCA. With the learning challenges gained from Kaveri, it would be GTRE who is ideal to lead this . This turbofan will be an effort by both private and public players in India. Yes, IIRC, there were s...

maitya

... and this is what Indranil had tweeted a few days back: Twitter - Indranil Roy Upgraded AAAU with 912-1000 TRMs. 2 sets to be built, one each by L1 and L2 (at L1 costs). Delivery timeline T0 +32weeks. Question is whether this is for Mk2 or Mk1A? https://pbs.twimg.com/media/E1SibsyVIAU-c3K?format=...

maitya

<snip> Radar could likely be the GaN variant of Uttam AESA radar. (LRDE has recently fabricated a GaN plank which is the building block for beginning to assemble a GaN AESA radar prototype). Indranil's tweet confirmed this. LRDE on the verge of realizing GaN based X-band AESA radar. 32 element plan...

maitya

I think only MKI can do this. Not even MKM can do this. Also If Jets can carry other types also, in a wartime - logistics would be simpler. We learned our lessons hard way starting from MKI start up Mission computer is indian and that controls major I/O functions, next in line was mirage upgrade th...

maitya

^^ Admiral, no miracle or anything, thanks to Project Vetrivale , we have not only the MCs but also the Radar Computers (for Bars) indigenously designed and developed in the late 90s (which were then continuously upgraded and variants of which were also used in other platforms like MiG-27, Jaguar, L...

maitya

sooraj wrote:https://twitter.com/ReviewVayu/status/1 ... 59680?s=20 --->

Is this for TEDBF ...

maitya

Prasad, Thanks for the very good and more importantly, informative, interview. The questions asked were quite specific and detailed as well, and it's quite evident that a good amount of preparation has gone behind them - class apart from what we generally see/get from other interviewers. Of course b...

maitya

54 Raffies make sense. Can fully utilize the ground-based assets that are invested in. Dauphin is waste of time. New A330 MRTT is a waste as well. we won't even use 30% of the life of the platform in 30-40 years. Best to buy used A330 and convert them if needed at 40% price. <snip> Not sure if the ...

maitya

I was talking about radar updates for the Su-30, for Mig-29's it will most probably be a Russian solution. ZHUK-AME FGA 50 is being marketed for MiG-35 ... so would be a good choice for the 29UPG further upgrades. But trust Russia to ask for an arm-and-a-leg for them :shock: , and so MiG-29s will c...

maitya

<snip> I hope the Avros are reengined and put back into service. They will make excellent MPAs. They weigh the same as the 295s and will have similarly powered engines. They were designed as airliners and are therefore more efficient than the 295s with a large ramp at the back. Consider the wing ar...

maitya

Prasad wrote:The slides are from last AI, so two years old.

Oh is it ... then should match up with this interview from AI, which stated,
1) Half way thru AA modes - 30 more sorties required to complete testing the AA modes
2) Total 18 modes - 10 modes completed
etc etc.

maitya

This 110kN engine is something not even the Amreekis nor Russians have. To step back a bit, what is so special about 110kN from a technical stand point (with current or even mature technology)? The US and Russia don't have it because they don't need it. That is no reason to make it unobtanium. <sni...

maitya

Buried in todays ToI news item: India leases top-notch US drones for surveillance amidst border row with China is this: The IAF is also finalizing a plan to “dry lease” or acquire six “pre-owned” mid-air refueling aircraft to extend the reach of its fighter jets. Though IAF overall needs 18 such “fo...

maitya

https://twitter.com/strategic_front/status/1278168960681246720?s=20 ---> High pressure compressor stator for the HAL HTFE-25 manufactured by 3D printing using the alloy Ti-6Al-4V. A stator converts KE into pressure energy. The complete design to realize cycle for the combustion chamber was done in ...

maitya

Now from ToI - headline says it all:

India seeks local warplanes as overseas purchase plan stalls

maitya

Kartik, <snip> Coming to Mk1A, I am a bit disappointed. There arise due to ADA/HAL divide IMHO. Mk1A is a strictly HAL-only project. HAL has shut out ADA as much as it could and ADA never came to the front in providing support. There was even delays in making LSPs available for conversion. So many ...

maitya

I am not so sure that he was speaking of wet thrust. I think we was speaking of materials. With a higher TET. See the quoted part below. I think with a 25 kN engine, they can easily get 40kN of wet thrust. https://aquantumofmind.wordpress.com/2015/10/31/presentation-on-heat-resistant-coating-for-sc...

maitya

It is not just a question of throwing money at the problem. The Chinese have sunk many times that amount into various engine programs by now and they are still catching up with the Russians, forget the Americans. SCB tech is the biggest unknown. Midhani should be funded to scale up their achievemen...

maitya

Is an IRST confirmed for Mk2? I see it in Kuntal's CG image. Nothing confirmed etc, but that's the plan we are hearing, right? The second (and smaller) plug (the nose-plug) is to allow for IRST integration. The jingo wet-dream of course, is we will have an indigenous OSF equiv - just like the dream...

maitya

My Understanding of LCA To follow up to my earlier discussions on LCA, I did lot of reading and also tried to understand the posts and articles of Indranil ( courtesy lockdown ). I had always been perplexed with (aerodynamic) design choices of LCA and had no satisfactory answer. Though I hasten to ...

maitya

The USAF is moving to MRAAM's that are going to be required to exceed the "CCM" performance capability of its current CCM (AIM-9X-II+), while also bettering the end game performance of the AIM-120. So both short range performance and end game agility will be top priority. They've spent mo...

maitya

BTW, what happened to DARE's High Band Jammer pod? It was supposed to replicate the functionality of the SAP-518 and not have the drawback of interference with the indigenous RWR..could it be the DARE HBJ in the picture with the IAF Su-30MKI and not the SAP-518? The item should be in development/te...

maitya

Prasad wrote:We have GaN xband trmms. That's confirmed.

Oh, at what Gain, max O/P Power and PAe figures?
Being GaN Power density would be very good anyway, so not asking.

maitya

Manufacture of GaN-based (gallium) chips for AESA. 2052 is GaAs based TRM. We don't GaN from Israel, as we already have them. There is a nice little TRM from BEL, with GaN transmitter & GaAs receiver. a way to reduce cost. Regarding the ToT, i really don't know what HAL is "producing"...

maitya

V_Raman wrote:I dont fully understand why Kaveri as it exists cannot be mated to a LCA and ~~at least ground tested~~flown in regular squadrons as squadron reserve platforms.

There, corrected it for you ...

maitya

Boost for 'Make in India': HAL's 25 kN aero engine completes inaugural run; can be used for trainer aircraft https://img.etimg.com/thumb/msid-50173781,width-300,imgsize-241461,resizemode-4/boost-for-make-in-india-hals-25-kn-aero-engine-completes-inaugural-run-can-be-used-for-trainer-aircraft.jpg <s...

maitya

<snip> The truth about Kaveri is somewhere in between the uninformed bashing that it receives and the adulation in this forum. The truth is that Kaveri non-afterburning engine is entering production. EOI is out for a potential 80 engine production run. It cannot be without a modicum of success. <sn...

maitya

Agupta sahab, I don't understand your arguments on the lack of an FTB is not a serious impediment. <snip> <snip> This is why I found Maitya's post about other metrics being met so interesting. For DRDO to admit defeat directly, lots of other stuff would have gone wrong than just LCF on the FTB or A...

maitya

Maitya, How much do you think the current Kabini core cost out of the total Kaveri program? to me looks like the turbo fan, casing the after burner are per requirement. So what will it take to come up with a new engine that will poser the MWF and the Naval Tejas Mk2. Nice if it can power AMCA but n...

maitya

Source for your claim that HAL made such claims? I have not yet seen a single authoritative article that claims such weight reductions. Here is link from same thread from 2016. The proposed 800 Kg weight reduction is being discussed. This was in the original HAL proposal, when they pitched the MK1A...

maitya

Cybaruji, I never said that we should do this alone - certifications etc aside, I'm saying yes, by all means, we should go ahead and ask for the hand-me-down cores from GE/Snecma/whosoever. If we are desperate to reimburse R&D budgets of these orgs, so be it ... but we should atleast maximise th...

maitya

We continue to re-hash the same old points that has got discussed umpteen number of times in the past - so maybe, one more time wouldn't hurt: 1) Developing a Turbofan for 110/xx/yy/zz KN with an imported core - this is like asking to develop LCA with an imported FCS. Might as well go for lic-mfg of...

maitya

the LCA was designed for the Kaveri. And the Kaveri has dimensions which made it comparable to the RD-33. The dimensions are fine. It is similar to F404, but not the weight. Extra weight means redesign of LCA . <snip> That's not correct ... accommodating some 100 odd Kg extra weight is easily withi...

maitya

Yes sir. Specifically these blades have the ysz tbc-coating by ebpvd done at arci with cooling holes. Actually I's hoping (against hope and almost a wet dream) that GTRE would take the easy way out and go for a LZ-YSZ bilayer TBC tech for both HPT and LPT blades and vanes, without delving too much ...

maitya

Prasadji, have highlighted the operative word of the below quote: ... Presently, efforts to make use of single-crystal turbine blades developed by Defence Metallurgical Research Laboratory (DMRL) ... As we all know we have had lab-production-level DMS4 based (4th Gen) SC blades from atleast 2015 onw...

maitya

I tweeted following stuff few days back. Tender from HAL for outsourcing of Single Crystal Blade castings for HPT and LPT. Interesting. My best guess is this is for Adour 871 engines which power IAF's Hawk AJT fleet. <snip> Even more interestingly, GTRE is looking for 3D printed HPT Nozzle Guide Va...

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