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by maitya
20 May 2015 11:42
Forum: Trash Can Archive
Topic: Rafale & MMRCA News and Discussions-9 August, 2014
Replies: 3963
Views: 165308

Re: Rafale & MMRCA News and Discussions-9 August, 2014

And thats the point. No one is buying a brand new shiny automobile. Expect large strategic defense purchases to have a strategic and political component to it and their is a legitimate reason for them to exist. The IAF simply does not trust the US when it comes to front line combat aircraft. That t...
by maitya
14 May 2015 17:29
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

[Part 4] Now question is how does all of these will get achieved, if at all? Any self-respecting nation would have simply pumped more funds into and made it fly in sqn services, irrespective of these thrust shortfalls ... for a simple reason, that ab-initio building-up 4th Gen military Turbofan cap...
by maitya
14 May 2015 17:24
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

[Part 3] Step 3) Bring next Gen Compressor material tech - and get the weight issue of the baseline K9 series resolved somewhat. This is where things will get interesting - as reducing weight, means tweaking the core itself (huge risk and huge re-testing effort). Some amount of weight-saving can co...
by maitya
14 May 2015 17:18
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

[Part 2] To that end, if you look at the links at the previous page, there are already some bits and pieces in place - in my mind the incremental steps needs to be: Step 1) Baseline the basic Mechanical/Thermodynamic turbofan design - Get Kaveri K9 (or whatever they call it nowadays) version into 1...
by maitya
14 May 2015 17:09
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

Guys let's not diss the Strategic solutions what Ulabatoriji continues to profess - contra-rotating stages etc (and not sure why he has not talked about variable-cycle engines yet though). These are all high-gain (but very-high-risk) endeavors which if successful, you simply skip/leap-frog two gens ...
by maitya
13 May 2015 08:37
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

<snip> The advantages of counter-rotating machines are several. Every conventional axial turbomachine stage has two parts: a Rotor that adds/removes work to/from the flow while making it swirl, and a Stator that slaps the flow back to being axial, while slowing down/ speeding up the flow by expansi...
by maitya
11 May 2015 10:35
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

The PeeAref server was cruelly shot down by a Ishtealth Mijjile just when I was going to post my previous post, m is ost-fortunately :mrgreen: So the F-136 engine has a diameter of 48 inches, the F-404 just 35 inches. IMO, this is the sort of problem that would be a killer if the design of the airf...
by maitya
29 Apr 2015 16:54
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

... PS: I would request deejay to comment on my above assertion viz. "line-pilots not allowed to come close to the LSPs to gain some platform-familiarity" vis-à-vis what happens, in the initial 30-50hrs (say) of flying time, when they transition from M/HOFTU to their specific platform-bas...
by maitya
29 Apr 2015 13:13
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

HAL not setting up a production line in time, citing business risk is unacceptable. However, apart from HAL the fault also lies with the program management. Whoever was overall responsible for the program should have insisted on the production line at HAL making progress. The concerned people at Mo...
by maitya
29 Apr 2015 12:22
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

... ... Any business orgn. will realize that IAF needs fighters in numbers and cheap , in quick time. IAF cannot go for any other single engine fighter apart from Tejas until and unless in the range of $ 30-50 million . Given such a enticing business case if an orgn. does not take proactive measure...
by maitya
28 Apr 2015 11:20
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

:rotfl: Vayu-2/15.LCA feature by AM Matheswaran.Traces the evolution of it from HF-24/Gnat era. Fundamental mistakes in concept,a light aircraft that brings with it performance v.similar to the aircraft it is replacing ,MIG-21,with no great capability increase to meet current and future needs. Mk-1...
by maitya
24 Apr 2015 10:46
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

An interesting viewpoint from Vijainder Thakur at https://www.myind.net/rafale-and-rationale-another-light-weight-fighter : India has scrapped the Rs 90,000 crore (approximately $15 billion) MMRCA deal for 126 Rafale jets, 108 of which were to be produced in India by HAL. The move followed Indian P...
by maitya
24 Apr 2015 10:21
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

Please pardonnez moi as they say in France. But I thought STR is "sustained turn rate" - and figures of 20 deg/sec and above are normal. Shivji, of course STR of 20deg/sec is "normal" etc - onlee small praablem of the "conditions" under which such "normal" pe...
by maitya
20 Apr 2015 17:34
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

<post deleted. please check your PM>
by maitya
17 Apr 2015 12:10
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

<snip> Second, is that sequential changes also add delays to the program, increase timelines and cost. ... KaranM-ji, as far as scope-creep is concerned, you know very well what happened back in 2003/4 … suddenly IAF mandated the outboard pylons would need to be able to carry 105Kg class WVAAM (R-7...
by maitya
17 Apr 2015 10:12
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

<snip> IFR and Guns are probably non-negotiable - completely discounting of course any possibility of FOC happening without Derby integration. Would this much prove this aircraft capable enough for the IAF to consider for curriculum development? Could you pls tell me why is IFR non-negotiable at th...
by maitya
17 Apr 2015 09:02
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

This needs de-constructing ... Massive dhoti shiver in the DRDO community wrt LCA it seems. I still hope believe that Modi will give a big push to LCA. Saurav Jha @SJha1618 · 42m 42 minutes ago >> * Nowhere in the world does so much of the envelope have to be proven for FOC. IAF's policy with regard...
by maitya
12 Apr 2015 12:59
Forum: Military Issues & History Forum
Topic: Poor IAF role in R&D, manufacture - HAL/IAF tiffs to blame?
Replies: 228
Views: 8680

Re: Low IAF role in R&D, manufacture - HAL/IAF tiffs to blam

Shivji, apologies for being with this somewhat facetious and shallow-sounding post of mine (mostly due to bandwidth issues). Question is, would you want to have your expert-driver (with the attended knowledge level) design the next sedan/SUV/whatever that you intend to possess? Would you want him to...
by maitya
03 Apr 2015 14:57
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

however despite all this the certified AoA of the tejas so far is less than the far simpler Mirage2K config and less than EF and Rafale and F18 something does not add up...unless some other part of the design is so bad, the wing stuff above just brings it back to even keel. Err Singhaji, why is thi...
by maitya
26 Mar 2015 12:49
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

Indranil, Maityaji, a request: These nuggets are lost in the thread. This is what makes BRF so much better as a learning resource! Could we please consolidate these into post or find a home for this on the main site? ^^^ Not sure, but I think Indranilji have agreed to do/attempt something similar (...
by maitya
26 Mar 2015 12:14
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

Great work! Now someone please explain what this means. ... Pure deltas are good for high AoA regime but not so much at low AoA. What typically has been done is to have wing designed with lower sweeps (~50deg) which are decent in low AoA regime and then introduce a highly swept inboard section to e...
by maitya
18 Mar 2015 08:23
Forum:
Topic: BR Mainsite 2.0 : Volunteers Wanted
Replies: 133
Views: 0

Re: BR Mainsite 2.0 : Volunteers Wanted

X-posted from the missile thread ...
Karan M wrote:Thakur_B, Nikhil_P, Maitya, Prasanna Simha, Kartik - gents are you interested in contributing to the R&D details on the BR Main site? Do let me or rahul m know.

Of course, but time can be a severe limiting factor, though ... but yes, always yes!!
by maitya
13 Mar 2015 08:26
Forum:
Topic: BR Mainsite 2.0 : Volunteers Wanted
Replies: 133
Views: 0

Re: BR Mainsite 2.0 : Volunteers Wanted

ramana wrote:I will work on my old expertise at BRM. I was co-editor for BRM with Rupak.

ramanaji, shouldn't Ulanbatori-ji be helping you in the BRM work?
by maitya
12 Mar 2015 08:50
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

... In fact even I have never been a big fan of tailless Delta design but guys remember in late 70s and 80s Deltas were in vogue just because F-22s, F-35s and now PKFA are not tailless Deltas it would be unfair to say that Tejas is a dated design issue is we just took too long to make it ... negiji...
by maitya
11 Mar 2015 09:08
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 3980
Views: 173977

Re: LCA Tejas: News and Discussions

Much as I admire Prof Prodyut Das' bold lateral thinking ability - he sure is having several new ones ripped open for him by ersaktivel of DFI and even one former fighter pilot. :D http://profprodyutdas.blogspot.in/2014/12/the-ada-lca-2014-open-source-review.html#comment-form Not jump-in in the fin...
by maitya
13 Jan 2015 19:09
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5010
Views: 973545

Re: Kaveri & aero-engine discussion

:D :D :D Good news from DMRL via Saurav Jha https://twitter.com/SJha1618/status/553946103184244736/photo/1 https://pbs.twimg.com/media/B7ADC0ZCYAEMXmV.png Don't miss the last line in picture. :D :D :D DMRL now has SCB tech. BETTER than what is used in AL31!!! :D :D :D This will now go into next gen...
by maitya
04 Jan 2015 00:08
Forum: Trash Can Archive
Topic: LCA News and Discussions, 22-Oct-2013
Replies: 3964
Views: 166268

Re: LCA News and Discussions, 22-Oct-2013

Also, why dont you do a wrietup on the aerodynamics of the LCA? Where you are unsure mark it as such. At least it would serve as huge FAQ versus teh "feelings type" rubbish discussions we tend to engage in on a cyclical basis, having the same claims and same rebuttals. Rest of us can add ...
by maitya
03 Jan 2015 17:16
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5010
Views: 973545

Re: Kaveri & aero-engine discussion

Have updated with simulator (asuming an achieved Fan Pressure Ratio of 4:1) ... http://i1355.photobucket.com/albums/q702/maitya/For%20BR%20-%20Engine/GasTurbineCalc_Jan15_zps585f9f96.png Also pls note have added a newer forecasted model where the core achieves the key performance parameters that was...
by maitya
02 Jan 2015 12:59
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5010
Views: 973545

Re: Kaveri & aero-engine discussion

@maitya from your chart it is clear that basic parameters and 1st order derivatives of current kaveri and ganga are same. so i assume ganga is derivative of kaveri. in such case how will they achieve 100MW work and 88kN dry thrust while current engine does not achieve original design values of 96MW...
by maitya
02 Jan 2015 11:26
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5010
Views: 973545

Re: Kaveri & aero-engine discussion

Some new features of the new 105-110 kN engine by GTRE have come forth. Maitya sir, you would love this . Inlet diameter: 820 mm Mass flow: 98-100 kg/s This calls for a quick THEORETICAL calc using the quick-&-dirty turbofan sim - here it is: http://i1355.photobucket.com/albums/q702/maitya/For%...
by maitya
01 Jan 2015 15:52
Forum: Trash Can Archive
Topic: LCA News and Discussions, 22-Oct-2013
Replies: 3964
Views: 166268

Re: LCA News and Discussions, 22-Oct-2013

I would like to revisit the question of need to redesign the inlet of Mk2. Saurav Jha had said (quoting Dr. Tamilmani) that Mk2 inlet does not need any change. His argument was that the airflow of the 414 is almost the same as Kaveri and the flight regime is not changing, so the inlets don't need a...
by maitya
29 Dec 2014 22:49
Forum: Trash Can Archive
Topic: LCA News and Discussions, 22-Oct-2013
Replies: 3964
Views: 166268

Re: LCA News and Discussions, 22-Oct-2013

...ie carbon fiber skins riveted /screwed in place of aluminium plates as in traditional stressed monocoque construction. This is not the best way to go with carbon fiber. Ideally it should be a large single piece carbon fibre structural stuff. The wing is going to be co-cured co bonded per the art...
by maitya
29 Dec 2014 17:50
Forum: Trash Can Archive
Topic: LCA News and Discussions, 22-Oct-2013
Replies: 3964
Views: 166268

Re: LCA News and Discussions, 22-Oct-2013

^^^^ Absolutely true!! As KaranM has rightly pointed out above, for WVR situations off-boresight missiles with HMS is sufficient to shrugg-off a few degrees of STR deficiency here and there. Plus in a BVR situation the slight adavantage of good STR also had got diminished with the advent of AESA equ...
by maitya
06 Oct 2014 09:48
Forum: Technology & Economic Forum
Topic: Indian investments thread
Replies: 432
Views: 29010

Re: Indian investments thread

In the 1st page of the thread, I'd posted that why from one of the most reviled investment option, ULIPs in the past couple of years, has slowly changed it's character (ofcourse after Govt/IRDA danda onlee) - further proof of it is in this ToI article, Why you should invest in Ulips now . But as I'v...
by maitya
09 Aug 2014 10:45
Forum: Trash Can Archive
Topic: Indian Naval News & Discussion - 12 Oct 2013
Replies: 4029
Views: 175891

Re: Indian Naval Discussion

X-posted from the Su-30 thread ... New Brahmos Chief Sudhir Kumar Mishra two part interview Part-1 Part-2 ... Apart from this, we are going to develop the BrahMos-Mini as well. So BrahMos-Mini can be launched from a torpedo tube. We are planning, we are designing to do it from the torpedo tube. So i...
by maitya
08 Aug 2014 15:10
Forum: Technology & Economic Forum
Topic: Indian investments thread
Replies: 432
Views: 29010

Re: Indian investments thread

Yes, ULIPs have been bad for people in general. I calculated the fee thy charge, whether you gain or lose. It is as much as 7% of the yearly investment at least in the first few years. <<snip>> ... Archanji, that's no longer an entirely correct stmt ... yes ULIPs were the worst type of invetment po...
by maitya
28 Jul 2014 13:39
Forum: Trash Can Archive
Topic: Rafale & MMRCA News and Discussions
Replies: 5225
Views: 212838

Re: Rafale & MMRCA News and Discussions

Various falsehoods needs pointing out (but will not provide any details, quite deliberately, as it's tiresome to repeat the same points over and over and over and over again endlessly), so here are they: <snip> APJAK was repeatedly warned about the tall talk from the GTRE about Kaveri and told that ...
by maitya
08 Jul 2014 09:13
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5010
Views: 973545

Re: Kaveri & aero-engine discussion

A few details of the Turboshaft engine from HAL are out through the RFI on Design, manufacturing, supply and ToT for single crystal blade for turboshaft engine program. It will be a 1000-1200 kW turboshaft engine. <<snip>> HAL is in the process of developing a new turboshaft engine for Helicopter a...
by maitya
28 May 2014 10:29
Forum: Trash Can Archive
Topic: LCA News and Discussions, 22-Oct-2013
Replies: 3964
Views: 166268

Re: LCA News and Discussions, 22-Oct-2013

^^^^^^ Shivji, as usual, is right!! It's a true stmt that we are atleast 2 gen behind contemporary military turbofans - broadly (and at a very high level) as follows: 1) Graduate to a turbofan tech of 1700deg C and 32 OPR resulting in TWR > 1.3 or 1.4 etc, with a reasonably "efficient" SPR...
by maitya
15 May 2014 11:33
Forum: Trash Can Archive
Topic: Indian Army: News and Discussions 15 Apr 2012
Replies: 3969
Views: 168928

Re: Indian Army: News and Discussions 15 Apr 2012

^^^^^ 29th Infantry Div is based out of Pathankot, isn't it? So are they palnning to merely upgrade it and move it to MSC, or is it that it will be a brand new div? Being a major airbase as well, means some amount of "flying artillery" units (maybe a sqn oh LCH), right from the inception, ...

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