Search found 227 matches

by arvin
10 Sep 2019 10:21
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

From the papers, it is evident ISRO took nothing for granted and had multiple redunduncies at every stage. Very robust hardware design wise I think. What they lacked was data to tune the software which will be available only by doing such landings multiple times. If vikram wakes up hope they get the...
by arvin
10 Sep 2019 07:26
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

power received was varying from -139 to -141 db.
by arvin
09 Sep 2019 23:34
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

Can some one read and expaling ref 9 of Arvin's link posted here 9) Abhishek Sharma, Deepak Kumar Agarwal, Jagadeesa Chandra Pisharady, S. Sunil Kumar, "Plume Flow Field Analysis for Lander Propulsion System of Chandrayaan-2 Mission," 68th International Astronautical Congress (IAC), Adela...
by arvin
09 Sep 2019 22:10
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

my query was regarding fine breaking sequence with 2 thrusters and not after it landed.

https://directory.eoportal.org/web/eopo ... 4rS13eHerb

The link has a figure saying only 2 were used in fine breaking.
by arvin
09 Sep 2019 21:34
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

If the other 2 thrusters(which were shut down) are fired will not that oppose the turning movement. The craft gimbaled along the axis perpendicular to the sides on which thrusters were shut down.
by arvin
08 Sep 2019 23:41
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

ISRO can release more detailed telemetery data and timelines in its website if it is OK with the powers that be. What happened to the lander? We know that the Moon's environment is super hostile. Did that environment have a role to play in the lander's failure? Did one of the 800KN engines under pe...
by arvin
08 Sep 2019 09:28
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

Article by tarmak. Good info on final moments. https://english.manoramaonline.com/news/nation/2019/09/07/chandrayaan-2-vikram-excess-velocity-final-phase.html “ Up to 2.1 km all was fine. Soon the rotation rates increased and the engine thrust went up to 100 per cent in place of around 70 per cent. ...
by arvin
07 Sep 2019 21:09
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 1991
Views: 216193

Re: Chandrayan-2 Mission

I think ISRO should do a Vikram-R or 2 with a rover as a stand alone mission than expediting Chandrayan-3 Mission. since we already have orbiter around the moon and which is expected to be there for 7 years. We should modify Vikram and the rover based on the data received and may be add a Radioisot...
by arvin
06 Sep 2019 23:44
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 4321
Views: 705349

Re: Indian Military Helicopters

Allowing hellfire with LCH would impact future sales of apache (read IA). Doubt they would allow it. The weapons and sensors(longbow) were the bait to buy the platform. They might allow helina on apache if we ask for it, just like israelis fire spike from their apache. But for only 22 apache we boug...
by arvin
02 Sep 2019 19:16
Forum: Technology & Economic Forum
Topic: Mass Rapid Transit in India
Replies: 1474
Views: 140523

Re: Mass Rapid Transit in India

Thanks for the link. Thats the tender work in progress alright. Atleast BMRCL has started soil testing work.
by arvin
02 Sep 2019 15:14
Forum: Technology & Economic Forum
Topic: Mass Rapid Transit in India
Replies: 1474
Views: 140523

Re: Mass Rapid Transit in India

Maybe. After IL&FS fiasco project was an orphan. Things falling in place after Con-JDs govt falling on its face.
by arvin
01 Sep 2019 18:10
Forum: Technology & Economic Forum
Topic: Mass Rapid Transit in India
Replies: 1474
Views: 140523

Re: Mass Rapid Transit in India

Two days back saw namma metro boards in ORR, blr. Diggging was in progress in couple of places between ecospace and iblur. couldnt believe my eyes. Yeddy means serious business looks like.
by arvin
26 Aug 2019 18:49
Forum: Strategic Issues & International Relations Forum
Topic: India Nuclear News and Discussion 4 July 2011
Replies: 4316
Views: 230936

Re: India Nuclear News and Discussion 4 July 2011

Could be toshiba-jsw steam turbines with factory in chennai.
by arvin
24 Aug 2019 07:38
Forum: Strategic Issues & International Relations Forum
Topic: Kerala Floods - Aftermath and Save Sabarimala
Replies: 2416
Views: 193965

Re: Kerala Floods - Aftermath and Save Sabarimala

^^^ Haha.... Too little Too late. Dictator PV used the party to enforce his personal beliefs even in the face of opposition within the party. The entire party suffered because of this. They might have begun to see fall in memberships.
by arvin
21 Aug 2019 22:47
Forum: Military Issues & History Forum
Topic: MiG-21 Bison shoots down F-16 in Kashmir
Replies: 3283
Views: 491071

Re: MiG-21 Bison shoots down F-16 in Kashmir

So if the Mig-21 had had a RWR, he would have had the chance to evade the incoming amraam and come back unscathed. His bison should be having one on the tip of tail. But the amraam must have been guided either by F16 or erieye. And it must locked on after coming close. Maybe something like briteclo...
by arvin
15 Aug 2019 18:11
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 4321
Views: 705349

Re: Indian Military Helicopters

Anti armour Shtrum will require a beam to ride on and hence also the small radar like on mi-35. A modification like this on a platform optimized for high altitude performance doesnt look economical. I think the entire anti armour role will be taken by 22 + 6 + 30 apache on the plains. LCH will be de...
by arvin
11 Aug 2019 08:06
Forum: Strategic Issues & International Relations Forum
Topic: J&K Union Territory-2019
Replies: 1989
Views: 246206

Re: J&K Union Territory-2019

RT yesterday had interview with paki high commissioner to uk in its 'going underground' program. They seem to be in a diplomatic overdrive on this. prospects of kashmir slipping out of their hands and their only reason for existence has clearly rattled them.
by arvin
10 Aug 2019 18:07
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

No. The (big) dams are practically empty. The smaller ones downstream are filled up and some opened. The rain seems to be more in the foothills and midlands this time. Last time it went further up and dumped beyond the big dams. Too bad we don't have the predictor up and running. Can we get at leas...
by arvin
05 Aug 2019 22:20
Forum: Technology & Economic Forum
Topic: J&K Property Discussion
Replies: 9
Views: 2149

Re: J&K Property Discussion

At 12:18 of the Amit shah speech posted in strat forum has precisely this point. Property value in srinagar not appreciating due to article 370. With that gone we might see Noida redux in srinagar.
by arvin
06 Jul 2019 09:25
Forum: Military Issues & History Forum
Topic: Indian Navy News & Discussion - 03 July 2018
Replies: 1952
Views: 429000

Re: Indian Navy News & Discussion - 03 July 2018

Agree with Li-ion assessment. One of the older kilos or the one rendered useless owing to torpedo loading explosion should be stripped of its lead acid batery and replaced with li-ion. Some kind of innovation would be required here just like tesla did it with battery of its electric cars. Endurance ...
by arvin
02 Jul 2019 17:15
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5557
Views: 489240

Re: Civil Aviation Development & Discussion

count so far is 85 cancelled and 54 diverted. will go into 100s by evening. the other runway is a bit weak in mum? I guess for accessing the second runway one has to go through the intersection and then positon for take off. This might be taking time with continuos rains. Blr is lucky soon it will ...
by arvin
25 Jun 2019 10:13
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1688
Views: 430412

Re: Indian Missiles News & Discussions - 17 Dec 2018

The bigger spike deal has been scrapped. But the smaler emergency purchase of 240 size for spike MR still stands. Just about sufficient till drdo thing comes online.
by arvin
21 Jun 2019 10:44
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

The defectors utility is to aid clearing triple talaq bill and other bills in rajya sabha. Read between lines. Nirav and mallya are of no use in that cause.
by arvin
20 Jun 2019 22:25
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

https://www.firstpost.com/politics/kodiyeri-balakrishnans-son-binoy-booked-on-charges-of-rape-being-groomed-as-vijayans-successor-case-personally-damaging-for-cpm-kerala-chief-6845241.html Another nail in the coffin of CPM in making. CPM leader kodiyeri's son has been slapped with rape charges by a ...
by arvin
09 Jun 2019 08:25
Forum: Technology & Economic Forum
Topic: Infrastructure News & Discussion
Replies: 707
Views: 144996

Re: Infrastructure News & Discussion

there is no visible movement on retendering of the vital ORR metro (that too just half of it) in blr after L1 winner IL&FS became insolvent. this was supposed to be done months ago by BBMP. this when the line will be viable and overused from day1 and corporates in each tech park have already do...
by arvin
08 Jun 2019 18:08
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

Modi visited kerala today and offered prayers at guruvayur temple. https://www.livemint.com/politics/news/kerala-is-as-much-mine-as-varanasi-says-pm-modi-after-visiting-guruvayur-temple/amp-1559979387451.html A visit so fast after assuming power leads me to think, bjp sees a hugh potential here, jus...
by arvin
28 May 2019 20:45
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

Likewise, TCR-EKM is ridiculously slow: I wonder what the hangup is, it's firm railbed, double electrified tracks. TCR-EKM should be like 40 minutes flat with 3 stops. Then EKM-Kottayam likewise can be sped up a lot. TCR-Guruvayoor probably takes a long time too, I wouldn't know. Seems like the tra...
by arvin
27 May 2019 20:14
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

Now GoKL wants a separate alignment for semi HSR tracks between Trivandrum and Shoranur and then the semi HSR will run adjacent to the current tracks between Tirur and Kasurgode. Other potential IEd, center can lay : 1.) Temple town of guruvayur was linked to trichur 25 years back in 1994. That was...
by arvin
25 May 2019 18:57
Forum: Strategic Issues & International Relations Forum
Topic: Kerala, Andhra and Tamil Nadu - news and strategy thread
Replies: 595
Views: 57655

Re: Kerala, Andhra and Tamil Nadu - news and strategy thread

Since Rae bareli will be the next target for AS blizzard, PV or SG will also shift to kerala. With 3 congi heavy weights there and state itself with 45% minorities, con system will make kerala their new home i feel.
by arvin
24 May 2019 17:16
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1688
Views: 430412

Re: Indian Missiles News & Discussions - 17 Dec 2018

Singha wrote:what is the conformal bulge in middle of fuselage with a black window? rwr?


Could be the counterpart of the camera which took the above pic. RWR are generally placed in obstruction free area like top of vertical tail to get a sense of direction.
by arvin
23 May 2019 22:48
Forum: Strategic Issues & International Relations Forum
Topic: 2019 General Elections : Results Discussion
Replies: 2982
Views: 113781

Re: 2019 General Elections News and Discussion

National herald case coming up for hearing in August in SC.
The best bjp did in waYanad was in 2014 getting 80000 votes. This year no candidate there. Strategy??
by arvin
23 May 2019 22:08
Forum: Strategic Issues & International Relations Forum
Topic: 2019 General Elections : Results Discussion
Replies: 2982
Views: 113781

Re: 2019 General Elections News and Discussion

well one brf senior member who is banned for now was arrogantly (I feel) telling us from other states that keralites vote with their head and hearts not on basis of jati/dharma and other bourgeois vices that the rest of india are all supposed to do . keralites are hence special and need house to ho...
by arvin
20 May 2019 15:41
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 3511
Views: 525373

Re: Indian Railways Thread (Dec 2015)

Assuming 5k+ diesels will be converted to electric , adding 800+ from alsthom and existing 5k+ electrics, GE's 1000 diesel will probably constitute 10% of rail transport mix. IMO thats a sweet spot to have considering current rail diesel bill of 12000 cr will become approx 2000cr or less if linearly...
by arvin
15 May 2019 22:10
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 3511
Views: 525373

Re: Indian Railways Thread (Dec 2015)

https://www.dailypioneer.com/2019/columnists/the-rail-network-dilemma.html Good piece on perils of fully electrified lines. Entire load will shift to coal plants which are more polluting than diesel. A central power source presents a danger in which if taken down via say hacking will bring to a halt...
by arvin
13 May 2019 20:36
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 3511
Views: 525373

Re: Indian Railways Thread (Dec 2015)

Piyush goyal did try to convince GE to scrap the diesel project and manufacture something else. But they did not budge. Goyal was putting a brave face when he justified the strategic thing but within him he knew, this wasnt fitting in larger scheme of things. I think CAG also had a lense on the proj...
by arvin
13 May 2019 18:40
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 3511
Views: 525373

Re: Indian Railways Thread (Dec 2015)

>>What does a clean sheet local electric locomotive design get us that something like WAG-12 (an Alstom Prima II derivative) doesn't get us ? We managed to distribute the traction across the train unlike WAG-12 which pulls the train. Since each bogie is self propelled with its set of 250 KW motors w...
by arvin
24 Apr 2019 06:43
Forum: Military Issues & History Forum
Topic: MiG-21 Bison shoots down F-16 in Kashmir
Replies: 3283
Views: 491071

Re: MiG-21 Bison shoots down F-16 in Kashmir

The 'vertical tail' aka paki mijjile is the starboard stabilizer. The assembly is lying with the tail on the ground.
by arvin
23 Apr 2019 06:15
Forum: Military Issues & History Forum
Topic: MiG-21 Bison shoots down F-16 in Kashmir
Replies: 3283
Views: 491071

Re: MiG-21 Bison shoots down F-16 in Kashmir

lalmo no ji for me.
what protected AV from the blast near the tail could be the design of mig 21 cockpit. The pilot sits well inside and the canopy barely rises above the spine. But this also hampers rear view visibility. All efforts in design were focussed on supersonic performance.
by arvin
22 Apr 2019 20:34
Forum: Military Issues & History Forum
Topic: MiG-21 Bison shoots down F-16 in Kashmir
Replies: 3283
Views: 491071

Re: MiG-21 Bison shoots down F-16 in Kashmir

Repeating.. what type of explosion would 1. Shear off the tail portion 2. Pepper tail with shrapnel 3. And rest of fuse seems without shrapnel Stabilizers also without sharpnel. Guessing ....Skin is aluminium and stabilizers titanium?. But both have been sheared off. So from what angle and directio...
by arvin
22 Apr 2019 20:13
Forum: Military Issues & History Forum
Topic: MiG-21 Bison shoots down F-16 in Kashmir
Replies: 3283
Views: 491071

Re: MiG-21 Bison shoots down F-16 in Kashmir

Could be a flat spin. The way the Mig hit the ground it appears as if port side wing hit the ground first then the fuselage. The wing is totally mangled, twisted over the fuselage. The starboard wing OTOH is distinctly identifiable and other parts inside fuselage.

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