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PostPosted: 13 May 2012 19:14 
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akimalik wrote:
Has anyone heard of this company:
http://en.wikipedia.org/wiki/Bladon_Jets

They manufacture Micro-Jets which Jaguar planned to use in their cars.
What are the chances that TATAs would get this tech?


Jet Power: Bladon's microjets enable Jaguar turbine hybrid

Do you know if they have a section for military applications?


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PostPosted: 15 May 2012 21:17 
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Every sentence worth a read

Quality our concern' - Interview with Avinash Chander

Quote:
TS: China has reacted in a big way. It says that Agni-V actually has a range of 8,000 km and that India has underplayed it
Is it true?

AS: No comments.


Where is that lungi of mine


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PostPosted: 15 May 2012 23:38 
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I sold it to couple of chippandas at work! ;) .. cause they want do the shiver part of it.


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PostPosted: 17 May 2012 04:06 
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Singha wrote:
nirbhay1 is likely sized to be dropped off MKI and MRCA, fired from 21" submarine TT and from ships inclined boxes and UVLS atleast . the big KH55 are manageable only by bombers. it can surely be upsized with a bigger fuel tank and made prahaar sized for land based truck launcher.

tomahawk SLCM is 20ft long and goes around 2000km...nirbhay1 is likely only around 15ft long.


Methinks Nirbhay = Tomahawk + Harop

Cruise Missile + UAV (main-in-the-loop target acquisition). If so, it will be something revolutionary


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PostPosted: 17 May 2012 04:18 
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Awesome! 8)


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PostPosted: 17 May 2012 15:01 
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http://livefist.blogspot.in/2012/05/could-this-be-indias-nirbhay-cruise.html

Quote:
So far, it had been thought (and continues to be believed) that the Nirbhay is powered by an NPO Saturn 36MT or 37-01E small-size turbofan engine, though The Hindu report linked above talks, weirdly, of a turbo-prop engine


Quote:
The DRDO chief has said on more than one occasion that the Nirbhay has a loitering capability. It is understood to sport a cruise speed of 0.7 Mach and a ceiling range of about 1,000-km. Reports suggest the Nirbhay is about 6-metres long and is a little over 50-cm in diameter. We also know that it is to be a multiplatform weapon, with land-launched, air-launched and sea-launched versions, and a capability to deliver 24 different warhead types


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PostPosted: 17 May 2012 15:36 
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suryag wrote:
Every sentence worth a read

Quality our concern' - Interview with Avinash Chander

Quote:
TS: China has reacted in a big way. It says that Agni-V actually has a range of 8,000 km and that India has underplayed it
Is it true?

AS: No comments.


Where is that lungi of mine


Excellent article... More than anything, it is the confidence boost that is worth noting...The talk about MIRV/MARV (around 2 -3 years), cannisters (around a year), QC is giving goosebumps...


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PostPosted: 17 May 2012 18:44 
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Shiv Aroor in the Nirbhay piece brings in the propfan speculation but of course fails to mention where it started from.

This was the piece from which the propfan speculation began.

http://m.ibnlive.com/blogs/sauravjha/29 ... ssile.html

Quote:
It is often remarked that the only thing missing in India's missile portfolio is a subsonic cruise missile akin to the BGM-109G Tomahawk ground launched cruise missile (GLCM) deployed by the Americans in the eighties. Fortunately, 2012 seems to be the year when this is set to change with several reports of DRDO's Nirbhay being shortly unveiled. One report is particularly noteworthy - TS Subramanian's 'Nirbhay likely to be testfired in April' in this Wednesday's The Hindu.

The story talks about the Nirbhay being a two-stage missile with the second stage powered by a turboprop engine. While the first part is simple enough - the two stages are obviously a reference to the solid booster (which is the 'first stage') used by the Nirbhay when it is launched from the ground; it is the second 'salient feature' that bothered me, i.e the part about the Nirbhay being powered by a turboprop engine during the cruise phase.

Cruise missiles in their 80-year history (considering the WW2 Luftwaffe V-I flying bomb as the first true cruise missile) have been powered by pulsejets, ramjets, turbojets and turbofans with the last two being the propulsive configuration of choice for missiles in Nirbhay's category, but never really by turboprops, unless of course you consider the MQ-9 Reaper to be a cruise missile, during a one-way suicide mission!



Dated March 9, 2012.

And that set off the following discussion on BR itself.
Propfan discussion on BRF


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PostPosted: 18 May 2012 07:59 
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why is he behaving like a fanboy posting speculative drawings with no basis in confirmed facts?


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PostPosted: 18 May 2012 08:11 
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Turbofan for powering CM is something we all know about , where is this reference to 'Propfan' coming from ? Aren't the two different things ?


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PostPosted: 18 May 2012 08:14 
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yes they are different. speculation is nirbhay is the name of a program not just one model and will be a family of missiles including propfan for loitering strike model which will sacrifice speed for endurance. see the old thread for what I had found wrt kh101 early day proposals.


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PostPosted: 18 May 2012 08:20 
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Quote:
why is he behaving like a fanboy posting speculative drawings with no basis in confirmed facts?


Not sure GD. But I am sure that is the ugliest effing monstrosity I've ever seen. Horrible RCS and how would you fit that in a sub launched tube? My eyes! My eyes!


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PostPosted: 18 May 2012 08:49 
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an old yankee istyle CM with contra-rotating props
Image

Image

and now a ruskie istyle KH101

Image

Unless DRDO might have achieved something significant that both yankees and ruskies failed with their own versions, a turbo-prop version of a CM will be a huge liability :D


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PostPosted: 18 May 2012 09:03 
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Quote:
turbo-prop version of a CM will be a huge liability


Again not turboprop but propfan. the first two pictures are of one of the American vehicles tried under the LRCSW proposals.

But yes, the programs were given up chiefly due to the enhanced radar return due to the propfan configuration.


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PostPosted: 18 May 2012 09:14 
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the KH101 model looks like the props are made of composite. that would not generate any return. or maybe metal can be coated with composite with a RAM material on top. it only needs to last for a couple hours of use, unlike a aircraft RAM coat.


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PostPosted: 18 May 2012 09:32 
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Yep. For instance , Work done on the blades for the (now cancelled) Comanche program for instance could migrate to LRCSW type configurations.


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PostPosted: 18 May 2012 10:29 
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GD afaik while the returned signal strength from a composite blade might not be of the same magnitude as a metal blade the problem with all exposed rotating blades is they modulate the impinging RF signal at a frequency corresponding to the blade RPM which is a very distinct pattern and shall be picked up by a volume search radar.


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PostPosted: 18 May 2012 10:53 
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if the fans are hidden within a cowl and deeply shrouded inlets bring the air in, would cover 3/4 of the problem. the rear aspect would still be open, but even turbofan cruise missile would have a tailpipe into which RF can bounce and hit the interior of combustion chamber and the rear set of blades .... imo the cowled propfan might have better RCS than the drop down engine of KH55 or fixed engined of KH59 with fully exposed compressor face.


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PostPosted: 18 May 2012 11:45 
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^ That is my understanding too, there is a old joke about the Tu-142 , they say RCS of it's huge props is not a big problem because the noise from it's engines reaches the enemy even before that. :D


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PostPosted: 18 May 2012 11:51 
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Propfan technology was studied for Kh-101 but was dropped in favour of ducted turbofan. The main advantage of Propfan is that its fuel effecient and can provide enhanced range , the disadvantage is its blades are exposed and those contrarotating blades can be picked up by any modern radar , most modern radars can actually count the number of blades if its exposed, i read even BARS of MKI can do that

For stealth ducted turbofan is a much better option , you can opt for S duct type intake and treat the duct and blades with RAM to reduce the rcs much further , something not possible with Propfan or directly exposed fan like Kh-59.

The mean rcs value of Kh-101 has been reduced to 0.01m2 compared to 0,2m2 of Tomahawk/Kh-55 class due to use of ducted turbofan and shaping when viewed in X band of RF.


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PostPosted: 18 May 2012 12:00 
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I totally agree that for DPSA conventional/strategic weapon, the KH101 model of shaping and ducted turbofan is the way go.

but for a long loiter ops at tactical and medium depth level (like interdicting enemy LOCs feeding into the battle area), some kind of piston engined Harpy/Harop and this propfan thing are the way to go imo as they give much better endurance allegedly. the threat levels will not be super high and the payload conventional, guidance need not be the fancy "dual" systems of a long range missile, more simpler and oriented to keep cost low.

in short a Super-harop if you will - with 10 times the endurance, better payload and domestically made..if cost is less we can issue them to all the artillery divisions and brigades liberally to be used at discretion of infantry division commander for each sector.


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PostPosted: 18 May 2012 13:42 
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Guys,

will the radar return from propfan be a major issue for a missile flying at tree top level.

Will the ground clutter not be sufficient to mask the additional radar return induced by the propfan.


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PostPosted: 18 May 2012 14:34 
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There are enough good low level radar and low level sam that a cruise missile mayl have to pass through before it reaches its target , ofcourse there would be AWACS and Balloon based Radar looking for low level targets


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PostPosted: 18 May 2012 17:14 
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Actually every variant has their own advantages and disadvantages. And depending upon their respective roles,we have to do a trade-off here.

As it was well known that there are atleast 2 variants of Nirbhay were under development,DRDO might be looking for a solution of all sorts with different models.

A turbofan variant was in the making for a long time ,even enginee being developed in-house with external help.

And now the prop-fan came out from no where just based on the word "loitering capability". Either it might be pure assumption or chanakyan.

A propfan version can be confused with a low flying UAV at dashing speeds :D changing the defensive posture of enemy?

A good ducted prop-fan with contour shaping airframe for good ultra low-visibility flying at 30m above ground level, I bet will be a nightmare for the enemy. :D


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PostPosted: 18 May 2012 18:59 
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like piranhas they should be let roam far and wide in the river. but a drop of blood hits the water and 100s converge using a homing beacon of sorts. very soon all the flesh is gone and only the bones remain.


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PostPosted: 18 May 2012 20:04 
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the duct weight is another aspect to consider, weighed against the additional thrust. but, then if it is stealth disadvantage, there are various coating techs, and kevlar composites for help.

again all depends on the mission profile... terrain hugging walas with highest velocity possible, with near lo on detection for long distance is a game changer.


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PostPosted: 18 May 2012 20:11 
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Austin wrote:
There are enough good low level radar and low level sam that a cruise missile mayl have to pass through before it reaches its target , ofcourse there would be AWACS and Balloon based Radar looking for low level targets


I don't think our enemies have so many resources to mount a 24 by 7 look down on every sector. Even if spotted, one needs to be able to counteract it or stop it and thats a different ball game.

We should perfect the cheapest option we can.


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PostPosted: 18 May 2012 20:18 
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passive receivers can help planning the route on long range missions.. more intelligence is required on board, where on hit by bandwidths, the missile could quickly detour on a safer path. capability can be established, and that would be very promising tech for UCAV dual use.


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PostPosted: 18 May 2012 22:01 
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SaiK wrote:
I sold it to couple of chippandas at work! ;) .. cause they want do the shiver part of it.


:rotfl: :rotfl: :rotfl: :rotfl: :rotfl:


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PostPosted: 18 May 2012 23:47 
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Rakshaks, sorry to interrupt the ongoing discussion, but…

This post may not win me many friends here on BRF, yet it needs to be written, and this is the only place to post it.

I have not written the following with the intention to find fault with others; particularly if I have mistaken their meaning or if they have mistaken their expression. (Side Note: I recently made what I thought was a clever post in the ‘Agni 5’ thread, only to later realize that I had sloppily finished the post with the word “fusion” instead of “fission” (or was it, vice-versa?), which totally futzed-up one of my key points. Disappointingly, nobody suggested giving me the benefit of the doubt, and I was repeatedly corrected for the technical error, rather than for the typo it actually was.)

Something happened back there in this dhagga (an ***INTELLIGENCE FAILURE***) on page nineteen, that I think bears a much closer examination. IN BRIEF: We received what constituted a “hot tip” via Rakshak ‘koti’, but because of what seems a lot like “groupthink”, the tip was never properly recognized or analyzed, not while it was current, and neither now that it is stale. As a result, the (in as much as it supposedly exists) credibility of the ‘BRF brain trust’ must necessarily be called into question. This reflects poorly on all of us; yet at the same time I couldn’t stand it going entirely unnoticed, and unexamined, so here goes….

To call this intelligence failure a failure of imagination also wouldn’t be wrong, except that imagination wasn’t necessary, because it all started with a photo, plain for all to see. Allow me….

On 06 Mar 2012 at BRF system time 08:00, Rakshak ‘koti’ coyly posted in this very same BRF thread the two lines “OMG” and “Is that what I think it is?” along with an outbound link to a Google+ pic posted by one “Anantha Krishnan M. (AK)” (who is, I believe, a journalist – correct me if I’m wrong). The pic is shown again below, under the table, enlarged and with my mark-ups, to save you the trip.

[Here's the link to koti's original post: viewtopic.php?p=1252175#p1252175 ]

Of the subsequent 38 posts in the thread that were germane to koti’s original post; only three posts were “on the money”, IMO (and these are shown in the table below in green). Of course, even until now, these three posts are not “popularly accepted” here on BRF (I am guessing), and I am interested to see the response to this particular (countervailing) post of mine.

Sadly, most posts offered in response to koti’s question displayed hollow or no reasoning. Rather, they were repetitions of other’s unsubstantiated assertions, or even just flat out “I agree with so-and-so” without any reason given as for why they thought that way. Some, at least, tried to be creative; but unfortunately they did so in support of “seemingly accepted wisdom” instead of the available photographic evidence. (I have depicted all these posts with red text).

Only five posts even attempted to offer critical analysis of what was being posted in the thread. (These posts I have depicted with bold black text). Again, sadly, no one seemed interested to follow-up these dissenting thoughts with further examination; for if they had, maybe there wouldn’t have been such a resoundingly erroneous chorus, repeated again and again and again (re: GSLV mk3).

http://www.synerlux.com/For_BRF/response_table.gif
just to be clear about what happened:

1) On 06/03/2012 8:00:00 AM, Rakshak koti posted a link to a pic;

2) By 06/03/2012 2:01:00 PM, at least three posts suggested/asked if the picture showed an SLBM canister. This idea was drowned-out by the much more popular theory of a GSLV mk3 end stage (even though this makes absolutely no sense, and was seemingly based solely on a crude estimate of dimensions, never mind materials, construction, features, *weld lines*, morphology, etc.). Apparently, nobody even examined the canister idea, and absolutely nobody even took notice of the (very peculiar, two-halve) hoisting rig, obviously designed for substantial weight, not an SLV end-stage made of (seamless!) composites. If Rakshak “sum” and Rakshak “MN Kumar” are like me, then they offered their thoughts without reading much of what others wrote before them (which is arguably also our failure, even though we were correct about the pic showing an SLBM canister in its hoisting rig; please see my marked-up pic below).

3) After 38 on-topic responses to koti’s original post, on 14/03/2012 1:36:00 PM, Rakshak Marut posted a link to an article that appeared in the BR news feed. This article was dated March 13, and it discussed the test firing of a K-15 missile from a submerged and towed pontoon, two days prior, on Sunday, March 11, 2012.

4) In fact, we here at BRF were alerted to this potentiality five days prior to this launch date, and seven days before the news article was published, but collectively, we failed to notice (even while a few of us did indeed see what was coming).

Behold the pic in question…

http://www.synerlux.com/For_BRF/India_SLBM_Canister.gif

The misapprehension of clear photographic evidence should *not* have happened here on BRF. The reasons why it did should give pause to each of us; should temper the way we read what is written here, and how we may chose to write back (or not write back).

Jumping to false conclusions too quickly is sometimes a hazard with the things we see and don’t understand immediately. This is somewhat less of a risk with the things we learn by taking the time to listen. This is because time often helps with understanding, in part because we need time to process (particularly complex) information; and trying to do this too quickly can easily lead to mistakes. If we can concentrate our attention and “look slower” and also spend the time to “listen deeper” (and read more carefully); altogether this can only make us “smarter”, as a group and as individuals.

MOVING FORWARD: I would respectfully suggest that we should all be more careful when we find ourselves eager to dismiss a discordant idea, or keen to disregard a dissenting opinion or discard a difficult question. This is not how a confident intellect approaches complex issues, and if we, each of us, cannot at least try to get this much right, then perhaps we need to do more reading and less writing. JMT.

Thanks for your attention, Rakshaks.

I sincerely hope we can all ‘take it to heart’; although I am more certain that someone will try yet again, to browbeat me about how the pic shows a GSLV mk3 end-stage. (Actually, in a perverse kind of way; I’m sorta looking forward to it!)

Confidential to Rakshak koti: What exactly did you think it was, in the first instance? (You never clarified!)


Last edited by Gerard on 19 May 2012 06:05, edited 1 time in total.
removed inlining


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PostPosted: 18 May 2012 23:53 
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Shiv Aroor is something really ! He first comes up with some really wierd looking design that he himself claims is his own imagination at work on what a Nirbhay will look like, and NOW claims that even he wishes that it looks nothing like what he imagined it will look like ! :rotfl: Then what on earth did he put those images up for? To scare everyone with his dated imagination or just to get eyes to his blog claiming he had some new stuff on the Nirbhay..clearly he lied, since he didn't.

link

Quote:
I'd just like to reassure everyone -- Like I said in the post, I'm one of the people who hopes the Nirbhay looks nothing like the artistic impressions that I had made. It it does, it'll be one of the clunkiest, quaintest weapons we've ever built.
:rotfl: (Could someone tell the dude that it was HIS OWN artistic impression and shows how easy it is to criticize others but when he comes up with something, it looks like it belongs to the 1950's era !)
Quote:
It was only a bit of guesswork based on what we know so far. I truly hope what we dont know about the Nirbhay dictates all its philosophies. And that's why the post title is question. We know literally nothing meaningful about how the weapon looks. But hopefully we'll know more soon.


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PostPosted: 19 May 2012 00:22 
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Even the latest Nirbhay post comes with similar disclaimer.

Ravi Karumanchiri:

If it's really a canister, then what do you think it's height is ? How will it fit into Arihant ?

and read tarmak's comments on the teaser picture in his blog.


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PostPosted: 19 May 2012 01:53 
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Ravi ji,

This is what it is:
http://tarmak007.blogspot.com/search/label/ISRO

Quote:
The GSLV MK-III payload fairing (PLF) undergoes rigorous qualification process for the flight-readiness at the Acoustic Test Facility of NAL in Bangalore. The core team and scientists associated with the project are also seen. Express Photo: Sudhakar Jain


Added later:
You think that nobody builds a nose-cone with a seam through the center. ISRO does:
Image

Image


Last edited by indranilroy on 19 May 2012 03:30, edited 1 time in total.

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PostPosted: 19 May 2012 03:04 
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Ravi Ji, you really worked hard on that post i admit.. :mrgreen:


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PostPosted: 19 May 2012 03:54 
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Atleast he tried no?

Ravi K, Good effort. However needed background in aero structures to get to right conclusion.

viewtopic.php?p=1252182#p1252182

I was off about the vehicle and so wrong also.


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PostPosted: 19 May 2012 05:00 
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@ Ravi,

Dude, are you really serious? :shock:

I wish I get that much of time :D

By the way, wasnt it concluded to be the payload faring the very same day that pic surfaced on the web? :)


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PostPosted: 19 May 2012 05:12 
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Again learn to appreciate the effort.


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PostPosted: 19 May 2012 06:01 
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jamwal wrote:
...

If it's really a canister, then what do you think it's height is ?

....


Here's how you can guess-estimate the height:

Code:
Given,

    * Number of steps on the ladder on the exo-structure: around 36 steps 
    * Number of steps as to the height of the man (near the top): around 6 steps
    * Average height of Indian male: 5 feet 4 inches

This means,
    = (36 steps / 6 steps) * 5.4 feet
    -> The height of the "canister" is approximately 32 feet 4 inches


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PostPosted: 19 May 2012 08:55 
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jamwal wrote:
Even the latest Nirbhay post comes with similar disclaimer.

Ravi Karumanchiri:

If it's really a canister, then what do you think it's height is ? How will it fit into Arihant ?

and read tarmak's comments on the teaser picture in his blog.


I am not an expert. I have acontrary view. it could be the GSLV upper with sats loaded and protective cover (the plastic kindda thing) and then a casing.

If you cross Saurya (which is alleged K-15 derivative) and the alleged K-15 launcher (as released by DRDO), IMHO, this might not be the pontoon.


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PostPosted: 19 May 2012 11:17 
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Did someone edit my previous post ?? I don't remember writing this line "and read tarmak's comments on the teaser picture in his blog." :-?

srai
32 feet is very close to 10 meters


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