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by prasannasimha
20 Jan 2017 09:12
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4447
Views: 1107263

prasannasimha

Did you know that the vacuum seal of a high altitude test facility is maintained by a shockwave !! in simpler english this would mean what? I was always wondering how they could test an engine in vacuum when the exhaust entering the chamber would "break " the vacuum and the exhaust has to...
by prasannasimha
16 Jan 2017 23:20
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4447
Views: 1107263

Re: Indian Space Programme Discussion - Sept 2016

Did you know that the vacuum seal of a high altitude test facility is maintained by a shockwave !!
by prasannasimha
15 Jan 2017 15:25
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^^ The order of accuracy and sampling rates for the missile INS and GPS are obviously much higher than what is provided by mobile phones. In fact if you notice Google initially did not provide positions within buildings on Google maps. They have now tried to provide that data by virtual INS combined...
by prasannasimha
15 Jan 2017 15:19
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

Inertial navigation is based on current location and adds on incrementally to the new position using a gyro to maintain true "North" and accelerometers to determine the deviation from the said "North" It is subject to errors like integration drift or rapid alteration in motion fa...
by prasannasimha
14 Jan 2017 21:57
Forum: Trash Can Archive
Topic: LCA: News & Discussions - October 2016
Replies: 4124
Views: 881796

Re: LCA: News & Discussions - October 2016

If I remember right they had multiple planes on jigs in one photo
by prasannasimha
14 Jan 2017 21:49
Forum: Technology & Economic Forum
Topic: Currency Demonetisation and Future course of Indian Economy
Replies: 7877
Views: 918680

Re: Currency Demonetisation and Future course of Indian Economy

^ Hmm then you have no data to support your statements.
by prasannasimha
13 Jan 2017 23:54
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^ Yes that is what I also thought when I read it however it was also interesting to see how some dismissed the possibility.
by prasannasimha
12 Jan 2017 20:50
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4447
Views: 1107263

Re: Indian Space Programme Discussion - Sept 2016

Actually I have seen ISRO scientists slog it day in and out during launch campaigns. This is a high risk and high stakes industry and it is easy to criticize but one error and millions of rupees worth of equipment will literally be blown into the air.
by prasannasimha
11 Jan 2017 07:20
Forum: Mil-Tech Archive
Topic: AMCA News and Discussions
Replies: 3310
Views: 548663

prasannasimha

All of these are used for aerospace vehicle design.
by prasannasimha
08 Jan 2017 16:03
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^^ I believe the specific method of ablative coating with chromium allowed a greatetravel distance. That was incorporated in al the further Iterations of Agni. I doubt they would have mentioned the actual methodology in any paper as it would be secret.(They applied for a patent so the actual method ...
by prasannasimha
08 Jan 2017 10:16
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

Agni 6 may just be that - make that stage composite instead of maraging steel and this itself reduces the missile weight which will increase the range. This was possibly purposely done (staged increase in composite materials). The K series may be in fact be just that allowing smaller packages allowi...
by prasannasimha
08 Jan 2017 10:10
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^^ Its not a SHH nose cone coating. Here is one statement made and there was a DRDO quote to its use as wellthat was widely quoted for eg http://articles.economictimes.indiatimes.com/2008-09-10/news/27724374_1_coating-longest-range-missile-missile-range BANGALORE: Indian scientists have developed pa...
by prasannasimha
08 Jan 2017 06:47
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Also the nose cone coating was changed which allowed a stupendous increase in range This in itself was supposed to disproportionately increase range for a given weight. We will never know true range but for all you know Agni 3 -5 may be in ICBM range. Our declared weights of missiles are disproporti...
by prasannasimha
08 Jan 2017 06:43
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Very likely propellant and casing was changed
by prasannasimha
08 Jan 2017 00:25
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Tessy Thomas quoted a significant reduction in Agni 3 weight
by prasannasimha
07 Jan 2017 22:01
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^ The ISU founder director is needed for this. ISRO has finetuned their inetrtial guidance and avionics substantially so they may be able to really help.
by prasannasimha
05 Jan 2017 18:47
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^^ This was what was told to me - the wing did not deply fully (I think they ahve to find out why) Probably if the wing got stuck at say 170 degrees instead of fullly out to 180 and gets lo9cked in place then things would be OK but if it gets stuck at some angle wouldn't it be difficult to maintain ...
by prasannasimha
05 Jan 2017 10:19
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

^The wing indeed is a single piece and rotates 180 degrees to deploy. Thee us a video somewhere out there showing IRS deployment testing. If I am right the wings deploy and the holes slam shut (probably for aerodynamic reasons bit I may be wrong. Should see a lateral photo in flight to see if the se...
by prasannasimha
05 Jan 2017 07:23
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

The wing unfolding (not fin) was supposed to be the issue.it did not deploy out fully causing it to veer after deployment.
by prasannasimha
03 Jan 2017 23:34
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Also Rustom has done a 10 minute flight and now the goal is to have retractable front wheels to allow 360 degree optical pod rotation. The ability to loiter and waypoint navigation should not be a problem
by prasannasimha
03 Jan 2017 23:31
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

^ That was what was told to me. They say contrary to some reports waypoint navigation was OK but fin /wing related issues caused problems. The last test was a catastrophic wind deployment issue aborting the test. Remember it launches vertically turns and then deploys the wings after which it goes in...
by prasannasimha
03 Jan 2017 23:19
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Problem with Nirnhay test told by a Chaiwalavtoba Paniwala was the unfolding of the wings (can it be called that) . This created the problem so mostly correctable without major issues.
by prasannasimha
02 Jan 2017 23:39
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

High loft has potential ASAT role. The question is what can it take out. Also high loft is associated with a higher rentry speed validating thermal protection.
One other thing is the reduced testing range may have been to conceal MIRV testing though Agni 4 and 5 seem to have too sharp a nose for it.
by prasannasimha
02 Jan 2017 13:19
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Why do I think these are all high apogee lobs being tested?
:D
by prasannasimha
01 Jan 2017 22:27
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

^^^ We will indeed never know the true pogee but can get an Idea knowing speed and geometry about a possible value - as I said the apogee coud easily be 2027 Kms but may be made less by bleeding off energy depressed inefficient trajectories etc. They probably did not want monitoring gagencies to see...
by prasannasimha
01 Jan 2017 15:44
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

I can tell one thing given a circular profile (non parabolic the height of lobbing would have been 2027 Kms so in essence the lob would have been higher than that to have a flight time of 19 minutes at 5 Kms/second. In essence the Apogee would have been not less than 2027 Kms assuming a flat surface.
by prasannasimha
01 Jan 2017 15:28
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

I got 5123 if you take points 20.7577N, 87.084E and 25.32 S, 88.32E Though there is one way they could have got 2500 Kms - if they had landed it in the first NOTAM area itself by using a very high altitude launch so we would ahve a 2500 Kms range but a very high parabolic/elliptoid arc. Wonder what ...
by prasannasimha
01 Jan 2017 14:17
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

Elegant pictures by Kurup. What are the software that are being used ?
by prasannasimha
01 Jan 2017 10:21
Forum: Technology & Economic Forum
Topic: Currency Demonetisation and Future course of Indian Economy
Replies: 7877
Views: 918680

Re: Currency Demonetisation and Future course of Indian Economy

Pronlem with BHIM - requirees first SIM card to be the one to be detected. Corporation bank and State Bank Associated Bank (like state bank of Mysore ) do not have still a UPI interface so GRrr essentially could not use it !! Should allow one to register multiple bank accounts through registered phone
by prasannasimha
01 Jan 2017 10:18
Forum: Trash Can Archive
Topic: Happy New Year!!! 2017
Replies: 12
Views: 1906

Re: Happy New Year!!! 2017

Happy New Year
by prasannasimha
28 Dec 2016 08:05
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

At the base of the rocket, a special tray is installed. A black-powder mortar system is initiated at launch time to rapidly push the tray and rocket upward out of the Silo. Immediately after exiting the Silo, the Tray is ejected to the side by small rocket motors. At the same time, a series of five ...
by prasannasimha
28 Dec 2016 08:03
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

Image

This explains cold launch very well
by prasannasimha
28 Dec 2016 07:47
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

The thing being ejected to the side is the base plate cap /piston that is used to seal and separate the gas generator and act as the piston for the ejection as well as protecting the missile. This is ejected by side lateral charge to prevent fall back on the truck and canister. Similar lateral charg...
by prasannasimha
28 Dec 2016 07:43
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

Re: Indian Missiles and Munitions Discussion - June'14

Unlikely to be 2500 Kim's mostly 2500 Kim's from Australia!
by prasannasimha
27 Dec 2016 20:30
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

The rate of burn in a gas generator is slower than a hot launch but still pretty fast.
by prasannasimha
27 Dec 2016 10:18
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4679
Views: 949464

prasannasimha

PS whatever I do the heading continues to be changed!

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