Bharat Rakshak

maitya

^^^Again, it seems these queries wrt delta-wing being more-draggy-less-draggy etc tend to keep coming up from time to time - so thought of reproducing one of my very old posts from Jan 2015 , which may help people (since it was made as much as possible in lay-man terms) get a perspective of lift-vs-...

maitya

Indranil wrote:Certainly, it is for new Kaveri.

Sorry I may have missed recent news items etc, but what is this new kaveri?

maitya

^^the double delta should generate more drag could that be the reason? Ummm, would you really need Thrust and only Thrust to negate drag is it? How about lift? And how about vortex-induced lift and more so about flow-attachment aspects of LCAs double-delta config etc. Some references are here and h...

maitya

Ok, so here it is ... a simplistic (yes, I must admit almost embarrassingly simplistic) side-by-side comparison of this so-called Kaver-with-M88-core, original Kaveri and “paper-injin” called “Improved Kaveri”. (and no I can’t use Ganga, as it is copyrighted by Vinaji). https://imgur.com/xe3xRgJ.pn...

maitya

Ok, so here it is ... a simplistic (yes, I must admit almost embarrassingly simplistic) side-by-side comparison of this so-called Kaver-with-M88-core, original Kaveri and “paper-injin” called “Improved Kaveri”. (and no I can’t use Ganga, as it is copyrighted by Vinaji). https://imgur.com/xe3xRgJ.png...

maitya

<snip> I will tell you my gut feeling: GTRE had a turbojet engine that works in prototype. So they wrapped a small fan around it and claimed its a turbofan. A BPR of 0.16:1 is almost like nothing. Its practically a turbojet. Might as well put a Rallis fan (my old hostel fan) in front of the turboje...

maitya

Maitya, Maybe I should have addressed you? IR if you know any Kaveri design guy ask him how a M88 core(designed for BPR 0.3) will work in a Kaveri (Designed for BPR 0.16) shroud? I don't think it will unless its de-rated. And they say its dia is smaller than the Kaveri shroud. Ramanaji, apologies, ...

maitya

<snip> What Maitya sir, JayS, UB, Haridas ji can teach us is what would be the BPR of a Kaveri fan with a M88 core. These numbers can be easily calculated from numbers present online. Maitya sir had a good excel sheet going. <snip> Hello Indranil, I think you are talking about this excel: http://i....

maitya

<snip> one day i read that kaveri met all the specifications...immediately after few days another report will be published that kaveri is not meeting specs and can be useful only for fitment on locomotives and war ships? You have stated that GTRE doesn't have engine testbeds? Hope you know that AL-...

maitya

Kaveri has not reached a stage where it can be tested on a Mig-29 replacing say one of the RD-33 with Kaveri .....even one has to reach that stage ........All this talk about meeting dry thrust and not meeting wet thrust is juggling with words from Certification POV you need to meet the requirement...

maitya

Gaganullah, no canards. They have not found any distinctive advantage with the canards with LCA config. LCA navy MK1 will soon have active LEVCONs to increase control at lower landing speeds. Whether they port it to the the AF version needs to be seen. It might help with CnBeta and marginally bette...

maitya

Simply increasing the mass-flow will give higher thrust ratings but at the cost of propulsive efficiency (2nd and 3rd last rows) etc - which would mean poor SFS etc (but that's price to pay for "leaky-turbofan" type design, a la F404, presumably for achieving flat-rating requirement etc)....

maitya

Report is now available on Blog http://ajaishukla.blogspot.in/2017/08/tejas-fighter-finally-achieves.html ... HAL has created five “Tier-1” suppliers that each build a part of the Tejas. The front fuselage is supplied by Dynamatic Technologies Ltd, Bengaluru; the centre fuselage by VEM Technologies...

maitya

I think Austin saar is right That we manufacture 60% Kaveri and assemble 40% m88 core in numbers maybe 300 + engines. Second option is that: 2. We keep working on Kabini core for another decade and keep assembling 100% GE 404 / 414 engines. Option 1 is better this way we will learn the production i...

maitya

<snip> Betw Vinaji, not sure how and where to host an image and link it's URL from here ... (like I earlier used to do, before that site went kaput). Your above thesis was backed by my back-of-envelope-simulator which showed Thrust growth options and corresponding impacts to TeT and OPR and Thermal...

maitya

Yes the M88 core was offered in the past too but not taken as GTRE did not think they need it. They focused on the LP/AB thinking they need to get more out of them. If you note DRDO chief's statement 60% of new Kaveri will be GTRE. So the LP/AB were not the problem. there is the ~ 60%. If I had the...

maitya

<snip> They didn't go for co-cured structure because that technology was simply not there for the use on LCA. Its a recent development in NAL and is still not so mature that they can use it on an operational fighter . Not even MK2 will have co bonded co-cured wing. Only AMCA will have it. Even toda...

maitya

Ideally, a stealthy Mk3 which is spiral development of Mk2. Basically what the Chinese are doing with their J-10s. In this, respect if LM accepts to codevelop what they fielded for the South Korean program with us; or if SAAB agrees to merge their 5th gen program program with our Mk-3 version, we s...

maitya

One thing that i have contemplated is why not ADA hand over MK1A and Mk2 development to HAL and get on full fledged development of AMCA . It will be good as all turf wars can be avoided and MK1A lessons will easily flow into Mk2. But, I think there is too much pride at stake here. I don't know if s...

maitya

This is a good enough confirmation that the test was a success Prime Minister Narendra Modi congratulates DRDO for successful Agni-V missile launch . Buried within the report are congratulations from the President as well. Now off to User Trials ... betw with the success of Agni-V, why do we really ...

maitya

What happened to the much displayed desi AESA radar at the last Aero-India? Another great 'technology demonstrator" what? If this is not trolling of worst kind (combined with naked flame-baiting), I don't know what trolling is!! Response will be there, but after allowing the admins to express ...

maitya

<snip> In the hind sight it would be easy to criticise but it would have been good if they went with two engine program one by GTRE and other by HAL to develop an engine for Tejas. The GTRE team simply lead every one on a rosy path that told us Kaveri would be ready , Now if they did not anticipate...

maitya

First you said there were no official confirmations, and when you see one, you say it cannot be trusted? Forget the forward looking statements, what about the clear announcement of completion of the tests? Do you want Manohar Parrikar to come home and inform you about the sucessful completion of te...

maitya

^^^^ However I doubt such upthursting etc (from 51KN dry to 65KN dry levels) can be achieved in 2 years etc ... the testing cycle itself will span atleast 2-3years. I think, realistically, what they are trying to do with Snecma (as a consultative partner) is completing the mandatory ground-runs (IIR...

maitya

Actually its not a necessity that core needs to be redesigned for increasing thrust. One can increase fan size - that is increase BPR. But then that will increase engine dia which will not fit in LCA probably. That boat has sailed long ago now anyway. :eek: Where's the extra power gonna come from, ...

maitya

^^ I don;t think there'll be any need of any FCS changes for the MK1A - it's mostly avionics-only "upgrade" over MK1 (and also some degree of internal systems arrangement for better turn-around time etc). However, if HAL pulls-off, some serious weight savings in the range of say >500K etc,...

maitya

I hope you read the report fully before making that comment. :P JayS ji I request that we do not make insinuations about the other person's thoroughness or understanding. By the time I reached page 10 I had found stuff that indicates why there have been delays and it does not need an engineer to un...

maitya

Can't believe the words being thrown around. "solve the problems with LCA", "induct the lca in large numbers", I have faith in NaMo and Parrikar and IAF. If LCA production issues were solved then they would have ordered more LCA. Yup ... spoken like true-blue customer. Somebody ...

maitya

We are confusing two issues. One whether LCA internal design is frozen, second whether HAL has set up the assembly line for manufacturing 8 LCA per annum for which funds were disbursed in 2001. HAL has not set up production line for 8 LCA per annum even after 16 years. And assembly lines are generi...

maitya

TATAs seem to have started shipping cars with their Revotron engine Shiv sir, Revotron came in only in 2014 with consultancy from AVL, Bosch, Honeywell et al....so some design was done but crucial hand holding was done by the leaders of the industry. The crucial area of knowledge around combustion,...

maitya

How I'm thoroughly confused ... especially when I compare with what is written in this . It says Garuda is the non-winged glide-bomb and was tested for a 30km range (on both 18th and 19th Aug'16 - and earlier from 2014 onwards as well) - and that Garuthmaa is the 1000Kg winged smart glide bomb was ...

maitya

So KaranM and Indranil, Recall that tender for concrete penetration simulations for HSLD, looks like they are complete. Oh! They lifted the skirt only a little bit. They are on the second generation of most of these designs. What you are seeing here is the kit for the HSLD (1000lb) bombs which has ...

maitya

^^^^ The complexity of the manufacturing SC blades, their various Gens (and how a modern DS blade has better thermo-mechanical properties compared to 1st and even 2nd Gen SCs) and also inter-relationship of the TeT (obtained from better metallurgical tech of SCs etc) and the OPR (from better HPC tec...

maitya

Hang on!! Isn't it that the Pigs used 120mm heavy mortar during last year (Aug 2015) shelling?

So exactly where is the escalation in this, we are merely being equal-equal here

- as I've said before, yeh dil maange more!!

maitya

Bande me hai dum. Vande Matram. All the nay sayers myself included are stunned. Modiji my proud salute and humble pranaam to you. You have brought tears to my eyes. Deejay...kush ? ;-) Nah, pls forgive this thick-skull'd SDRE here - I can only keep body counts and compare. Only 2? Nah, not enough ....

maitya

BREAKING retaliatory strikes carried out last night https://twitter.com/bennedose/status/781384840977408000 Yes breaking news on ToI as well: " Indian Army conducted surgical strikes on terror launch pads on the LoC, significant casualties have been caused: DGMO " Need some photos to cool...

maitya

Kartik wrote:thanks Dileep for the updates!

IFR probe integration is almost complete? Which LSP will it be fitted to and has it been fitted already? When do flight trials begin?

LSP-8

maitya

Some unverified news - if true could be a completely different game Modi is willing to play .. 20 militants so far killed by 2/2 elite Para Commandos of Indian Army in PoK...strike inside PoK. Army may not officially declare moving inside POK and call it infiltration bid in Uri. Inside reports say ...

maitya

I can only state on here what my thoughts tell me so I am not trying to change anyone's thought process or opinions, just laying open my own thoughts. I repeat - let me assume that we have a great leader, a fantastic bold thinker who dares to do the unthinkable or the difficult. And this leader is ...

maitya

Have voted for option 1 as, till some action happens, to us this is as cowardly and clueless a GoI as was the previous ones, particularly the last one - same-to-same!! X-posted from another thread (my own post): <snip> The way to deal with Pakistan will have to be carefully calibrated and options an...

Search found 449 matches