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by Sridhar
28 Feb 2019 09:44
Forum: Military Issues Archive
Topic: Indian Forces Strike Pakistan - News Only
Replies: 338
Views: 35824

Re: Indian Forces Strike Pakistan - News Only

What exactly are the guys saying in the video?
by Sridhar
04 Jul 2017 11:20
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Thanks for sharing the article post the first ASLV test that resulted in failure. This test initiated my interest in ISRO. I wrote my very first article about India's space program for my school's annual magazine and have followed ISRO keenly ever since. It's amazing how far we have come since then....
by Sridhar
03 Jul 2017 01:31
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Where is Mullah Enqyoob btw? Really miss his knowledge and humor on the forum.
by Sridhar
03 Jul 2017 01:23
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Vina,

Further to your comment about soot and the Soviet/Russian launchers, isn't it the case that the pre-burners in the R-7 Semyorka derived launchers do not even use RP-1/kerosene in the first place? So, the question of soot does not even arise.
by Sridhar
03 Jul 2017 00:47
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Suraj Second the comment about the quality of the discussion. Vina's and ldev's posts have been very enlightening in particular. Thanks for the inputs/links. Launch vehicle technology is unforgiving. Failures are to be expected for even the most competent of players. The Chinese will figure it out a...
by Sridhar
02 Jul 2017 16:32
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Vina, Thanks for your post about clustering. You are right - the MK1/2 strapons are not really boosters in the sense of being jettisoned while the core stage continues burning. It's a weird configuration where the strapons burn longer than the core stage and carry the dead weight of the burned out c...
by Sridhar
01 Jul 2017 11:00
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

GSLV-MK1/2 have liquid strap on boosters.
by Sridhar
01 Jul 2017 10:15
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Have never seen two boosters operating in parallel being referred to as a clustered design. But others know more than me, and I am refreshing my understanding of this.
by Sridhar
01 Jul 2017 09:59
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Did a quick review of the relevant section of "Modern Engineering for Liquid Propellant Rocket Engines" by Dieter K Hazel and realized that my understanding is not accurate. There are multiple configurations for clustering. For instance, the Saturn-V first stage used not just multiple engi...
by Sridhar
01 Jul 2017 09:45
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Like I said, I am happy to be corrected. I am actually not sure but in the L-110, the turbopumps are not shared but the propellant tanks are. By that definition, its the shared propellant tanks and not turbo pumps that matters. Or would two separate boosters operating simultaneously but independentl...
by Sridhar
01 Jul 2017 09:08
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Vina, Correct me if my understanding is wrong. But in my understanding, a clustered stage configuration involves two or more thrust chambers but shared propellant tanks and turbines. The Soviet clustered stages involved this - their main issue was sustaining stable combustion in a larger thrust cham...
by Sridhar
30 Jun 2017 02:43
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

If I understand correctly, you seem to be saying that LVM3is the name of a one-off vehicle used in the LVM3-X/CARE experiment, and was not another name used for the GSLV-MK3 vehicle. That is not accurate. The LVM3 name was used internally as well as for external messaging purposes to refer to the GS...
by Sridhar
29 Jun 2017 23:35
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Suraj,

Thanks. I don't know the rationale for the name switch back to GSLV-MK3 from LVM-3. But that name has largely been discarded and Mark-3 is the short form people within ISRO use in conversation and GSLV-MK3 more formally.
by Sridhar
28 Jun 2017 23:07
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

I was hesitating to post my own articles here, but am posting here since they have not been posted earlier. These were blog posts on the Planetary Society blog just before and just after the GSLV-MK3 launch. Curtain raiser on the launch http://www.planetary.org/blogs/guest-blogs/2017/0602-india-ente...
by Sridhar
21 Jun 2017 03:54
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Shouldn't they lower the orbit and take a closer look? who will fault them if anything goes wrong after a 1000 days in orbit. They should specify how much of the missions objectives were achieved so far, what are the findings from each of the payloads etc. And still somebody has to go up there to c...
by Sridhar
06 Jun 2017 21:58
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57219

Re: GSLV-Mk III launch program/post-launch analysis

There are actually not three, but six thrusters on each S-200 that are fired after separation. Three near the top of the booster, and three near the bottom. Shiv: there are use cases for both large and small satellites. Not complete substitutes for each other. When the power requirements on the sate...
by Sridhar
06 Jun 2017 00:45
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

As we celebrate this successful start of the third phase of ISRO's launch vehicle program, here's an article from the archives that is worth reading. It is from 1983, when the last of the SLV-3s, constituting the first experimental phase of the program, was launched. http://indiatoday.intoday.in/sto...
by Sridhar
05 Jun 2017 18:14
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57219

Re: GSLV-Mk III launch program/post-launch analysis

Congratulations, ISRO! Two debuts here - the cryogenic engine and the vehicle as a whole.
by Sridhar
02 Jun 2017 23:28
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

Below is a listing of current and some proposed launch vehicles from around the world. All figures sourced from Wikipedia. Gives some idea about the efficiency of various designs in lofting payloads to GTO: Ariane 5 esa Mass at lift off tons 777 Payload to GTO tons 10.5 2 stage Payload to GTO/Mass ...
by Sridhar
31 May 2017 22:31
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3735
Views: 724691

Re: Indian Space Programme Discussion - Sept 2016

16t is there any single sat that large needed in gto? The kh12 sats of that weight x 20m long orbit in 400km i believe...even gslv mk3 with a huge payload fairing should be able to achieve 8tons..to 400km orbit.. These payloads are likely to be very rare and with long life. We should keep a special...
by Sridhar
10 Jan 2017 01:09
Forum: Trash Can Archive
Topic: Pakistan arms sales, ops, doctrine, etc
Replies: 3094
Views: 223007

Re: Pakistan arms sales, ops, doctrine, etc

I just noticed another aspect of the video posted for the supposed SLCM. The missile that was shown being launched was grey/white/silver in color. The subsequent shots show a red colored missile. I knew about the Pak expertise in painting missiles, but this in-flight paint job is a first even for th...
by Sridhar
27 May 2016 20:55
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

There were many contributory factors to ISRO's success and differences relative to other parts of the Government. And many people have played a role in making the organization what it is. But according to some of the insiders I have spoken to including Satish Dhawan himself, one very important facto...
by Sridhar
15 May 2016 18:32
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

More Vehicle Assembly buildings seem to be coming up on the new launch pad. There are already 2 along the main railway transport line, one seems to be perpendicular and another at an angle... http://i.imgur.com/xdK95UT.jpg Just some clarifications. What you refer to as the new VAB on the existing l...
by Sridhar
27 Jul 2015 22:49
Forum: Strategic Issues & International Relations Forum
Topic: Many dead, including Police SP in Gurdaspur Terror attack
Replies: 1054
Views: 30545

Re: Many dead, including Police SP in Gurdaspur Terror attac

More important than us knowing is GHQ getting the message.
by Sridhar
27 Jul 2015 22:42
Forum: Strategic Issues & International Relations Forum
Topic: Many dead, including Police SP in Gurdaspur Terror attack
Replies: 1054
Views: 30545

Re: Many dead, including Police SP in Gurdaspur Terror attac

Great bravery shown by the Punjab Police, with their officers leading the men from the front. We should complement their bravery by equipping them with the gear and equipment to fully protect themselves and be most effective in their tasks. Really sad to see the loss of life of personnel, including ...
by Sridhar
27 Jul 2015 21:32
Forum: Strategic Issues & International Relations Forum
Topic: Sunni Terrorist Fragments of Unstable Pakistan-July 10, 2015
Replies: 2850
Views: 82224

Re: Sunni Terrorist Fragments of Unstable Pakistan-July 10,

Minhaz Merchant on how to make Pakistan pay http://www.dailyo.in/politics/gurdaspur-attack-exposes-pakistan-as-a-state-sponsor-of-terrorism-modi-26-11/story/1/5255.html Highlights Pacifists want to engage with Pakistan. Dialogue is the only way forward, they say. Rajya Sabha MP Mani Shankar Aiyar co...
by Sridhar
27 Jul 2015 21:16
Forum: Military Issues & History Forum
Topic: Abdul Kalam passes away Oct 15, 1931 - July 27, 2015
Replies: 222
Views: 8837

Re: Abdul Kalam passes away Oct 15, 1931 - July 27, 2015

I sent him a poem that I wrote and published first on Bharat Rakshak Monitor. He was kind enough to write a personal note in response, which I will treasure. When he was President, he once inaugurated the December music season at Music Academy at Chennai, where I was in the audience. His humility, k...
by Sridhar
27 Jul 2015 20:11
Forum: Military Issues & History Forum
Topic: Abdul Kalam passes away Oct 15, 1931 - July 27, 2015
Replies: 222
Views: 8837

Re: Abdul Kalam passes away Oct 15, 1931 - July 27, 2015

Sad to hear this news. He continued his mission of teaching and educating right till the end.

R.I.P.
by Sridhar
09 Mar 2015 22:09
Forum: Strategic Issues & International Relations Forum
Topic: Sunni Terrorist Fragments of Unstable Pakistan - 1 Feb 2015
Replies: 2852
Views: 85401

Re: Sunni Terrorist Fragments of Unstable Pakistan - 1 Feb 2

This is DF-21, 2-stage, solid-propellant 2500 Km range. Shaheen-2 was DF-15. There were some reports last year that Saudi Arabia had purchased these missiles. Perhaps it was a joint purchase deal, or maybe the Saudis funded the acquisition for the Pakistanis. Also, isn't the DF-15/M-9 single-staged...
by Sridhar
22 Dec 2014 12:19
Forum: Strategic Issues & International Relations Forum
Topic: Sunni Terrorist Fragments of Unstable Pakistan - 12 Dec 2014
Replies: 2853
Views: 82257

Re: Sunni Terrorist Fragments of Unstable Pakistan - 12 Dec

I guess I was a little outdated in my opinion of Ms Fair. I went through her Twitter feeds. Her thappads are well aimed sand quite enjoyable, I must say.
by Sridhar
14 Dec 2014 13:39
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

Ankur, what is the large building with the blue 'doors' in the immediate background? Not the first VAB, is it? Would they have 2 assembly buildings so close together The building in the back is the solid stage assembly building. The S200 stages are assembled there,before being wheeled out to the Ve...
by Sridhar
21 Nov 2014 03:11
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

The PSLV is an extremely reliable launcher, and while reliability is one of the important aspects of human-rating a launcher, it is not the only one. Other aspects are important to making it suitable to launch humans, including the G-force profile, the degree of vibration, the risk profile in case o...
by Sridhar
02 Oct 2014 20:54
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

Why do they necessarily need a cryogenic engine with a restart? Why can't they just use the Payload Assist Module (developed initially when there was a proposal to launch some of the GLONASS sats using Indian launchers)? The main issue is that there is a need for an engine that can be fired after th...
by Sridhar
04 Aug 2014 13:18
Forum: History & Current Affairs Archive
Topic: 2014 Commonwealth Games
Replies: 207
Views: 14047

Re: 2014 Commonwealth Games

Not to forget S.M.Arif, who has discovered and nurtured much of the current talent including Saina Nehwal, Jwala Gutta and P. Kashyap, besides Gopichand himself. If Hyderabad is a key bar for Indian badminton, Arif must get a significant part of the credit. What Gopichand is doing is nothing short o...
by Sridhar
08 Jul 2014 22:50
Forum: Trash Can Archive
Topic: Indian Railways Thread
Replies: 3940
Views: 319231

Re: Indian Railways Thread

HSR on the diamond quadrilateral does not necessarily make sense anyway. HSR typically works well in the long run on routes where it can save time relative to flying (in which is included the time to get to and from the airport, waiting time at the airport etc.). For longer distances than that, it d...
by Sridhar
30 Jun 2014 12:30
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

Modi asked ISRO to extend the range of IRNSS to all of South Asia. But my understanding was that it already covers it - its stated objective being coverage of the Indian landmass and a range of at least 1000kms, and typically 1500+ kms around it. Or is that understanding incorrect?
by Sridhar
30 Jun 2014 09:56
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

The SAARC satellite idea is a good one. Also, he has asked ISRO to extend the range of the IRNSS.
by Sridhar
30 Jun 2014 09:45
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

BTW, this is the 10th mission for the PSLV-CA configuration, all of which have been successful.
by Sridhar
30 Jun 2014 09:37
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 205760

Re: Indian Space Programme Discussion

LVM3-X1 mission is scheduled for August. Congratulations, ISRO.

PSLV missions have become boring (in a nice way). This is the 24th successive 100% successful mission of the vehicle and the 26th successful mission overall.

Now, on to the same target for the larger launchers.

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