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by prasannasimha
20 May 2018 22:20
Forum: Military Issues & History Forum
Topic: Russian weapons and military technology
Replies: 1327
Views: 146290

Re: Russian weapons and military technology

Please stop this name calling and start discussing congenially . If this continues we will have to delete posts and issue warnings.
by prasannasimha
07 May 2018 07:36
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

https://twitter.com/indiandefence11/status/993055514392068097/photo/1 According to recent updates, the Reusable Launch Vehicle (RLV-TD) of ISRO has undergone autonomous runway Landing with landing gear and low subsonic tests completed at IIT, Kanpur. Now a scaled-up version of RLV will be developed...
by prasannasimha
02 May 2018 23:27
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Think of connections and that will be the cause.
Do connectors and convertors cause arcing if faulty?
Solar panels generate DC current isn't it
by prasannasimha
29 Apr 2018 22:57
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

https://timesofindia.indiatimes.com/india/isro-to-check-gsat-11-power-system-redundancy-logic/articleshow/63956798.cms Isro to check GSAT-11 power system redundancy, logic Chethan Kumar | TNN | Apr 29, 2018, 04:27 IST HIGHLIGHTS The satellite was to be launched on May 25 from Kourou, French Guiana,...
by prasannasimha
27 Apr 2018 19:14
Forum: Strategic Issues & International Relations Forum
Topic: Neutering & Defanging Chinese Threat (15-11-2017)
Replies: 1653
Views: 181519

Re: Neutering & Defanging Chinese Threat (15-11-2017)

Gaganshakthi followed by trade visit. Things speak for itself.
by prasannasimha
25 Apr 2018 23:15
Forum: Military Issues & History Forum
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 1416
Views: 253169

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

All 8 Tejas were involved. Some where Rona Dhonaing that 6/4 were involved. Lot of unnecessary spin it seems to denigrate Tejas. 45 replies 1,032 retweets 1,349 likes Reply 45 Retweet 1.0K Like 1.3K Direct message Saurav Jha ‏ @SJha1618 4h4 hours ago More Any more doubts about the fact that the Teja...
by prasannasimha
23 Apr 2018 18:50
Forum: Strategic Issues & International Relations Forum
Topic: Neutering & Defanging Chinese Threat (15-11-2017)
Replies: 1653
Views: 181519

Re: Neutering & Defanging Chinese Threat (15-11-2017)

One thing to notice is Gaganshakthi followed by meeting. Page of Han's textbook torn
by prasannasimha
22 Apr 2018 00:26
Forum: Military Issues & History Forum
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 1416
Views: 253169

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

I am glad the OBOGS is an O2 concentrator system and not a generation system as that could be fire hazard. Most likely a N2 absorption system. The entire system looks like a hospital operating room Anesthesia system. shiv your thoughts? ramana I think it must be a concentrator and not a generator, ...
by prasannasimha
21 Apr 2018 07:03
Forum: Military Issues & History Forum
Topic: Kaveri & aero-engine discussion
Replies: 4220
Views: 676332

Re: Kaveri & aero-engine discussion

Yes but when I asked I think they had toyed with or implemented that idea already as they were telling about some channels for water I asked if it was just to cool and they said it was not the only reason and the subsequent discussion went over my head. When I saw this discussion it suddenly reminde...
by prasannasimha
21 Apr 2018 06:41
Forum: Military Issues & History Forum
Topic: Kaveri & aero-engine discussion
Replies: 4220
Views: 676332

Re: Kaveri & aero-engine discussion

Regarding water injection incidentally Kaveri blades were modified to be liquid cooled with a channel in it when I saw it in one of the exhibitions.
by prasannasimha
19 Apr 2018 09:34
Forum: Military Issues & History Forum
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 1416
Views: 253169

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

Would take time. Remember even the F22 OBOGS had major issues that required sorting out. It also requires repacking and plumbing other things to fit the system.
by prasannasimha
18 Apr 2018 19:32
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Apr 15, 2018 : The fourth and the final orbit raising operation of IRNSS-1I is successfully carried out at 21:05 hr IST on April 15, 2018. The achieved perigee height is 35,462.9 km and apogee height is 35,737.8 km
by prasannasimha
18 Apr 2018 00:09
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3677
Views: 642254

Re: Indian Missiles News and Discussions - May 2017

^^30 meteres includes the engine and driver module of the TCT whereas the Canister is much shorter
by prasannasimha
16 Apr 2018 21:38
Forum: Military Issues & History Forum
Topic: AMCA News and Discussions
Replies: 3162
Views: 339309

Re: AMCA News and Discussions

I don't think these are the latest models. I have seen these in Adamya Chethana last year. . I think you will not see the exact final model for obvious reasons
by prasannasimha
04 Apr 2018 23:37
Forum: Military Issues & History Forum
Topic: Kaveri & aero-engine discussion
Replies: 4220
Views: 676332

Re: Kaveri & aero-engine discussion

^ the issue is still that no test bed was provided. Soomehow that has become a big stumbling block
by prasannasimha
04 Apr 2018 23:36
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

The satellites we lost in orbit were essentially Chandrayaan and GSAT6 A. The others were due to different reasons. Power failure and occurred in both. The first failure was ananlyzed and mistakes were corrected in MOM. The seodn will also undergo a failure analysis in the mockup
by prasannasimha
03 Apr 2018 23:53
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Satellite is lost. Its a power system problem from what it seems.
by prasannasimha
03 Apr 2018 09:02
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Once the solar panels are activated various systems are switched on. Power electronics guys may be able to tell better but once the solar panels start charging that current has to be stored/ used or dissipated. Certain portions of the circuitry would be energised and probably that gave rise to probl...
by prasannasimha
03 Apr 2018 07:37
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

GSAT 6 had 2 KW whereas GSAT 6A 3.119 KW
by prasannasimha
03 Apr 2018 07:35
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Surprisingly in aerospace going by past history some obvious ( in hind sight ) error has brought missions down. Simple things like conversions ,reversed connectors etc etc throughput history of aerospace engineering.
by prasannasimha
02 Apr 2018 23:19
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

the I2K buus is rated upto 3 KW. I think GSAT6-A had a rating of 3.2 KW. Could that have been an issue ?
Power 3,119 watts actually as a a precise value

For I2K Bus

Total Power: 2800 W.
Payload Power: 2400 W.
by prasannasimha
02 Apr 2018 22:07
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

^ supposed to be toast. Power surge related.
by prasannasimha
02 Apr 2018 18:51
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Seeing the time now it looks like salvage will not be possible.
by prasannasimha
01 Apr 2018 22:14
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

There probably was an issue with power requirements. This satellite had a higher power requirement than the previous one.
by prasannasimha
01 Apr 2018 18:09
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Supposed to be a power overload problem. Got nothing to do with the launcher etc.
by prasannasimha
31 Mar 2018 00:26
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Mar 30, 2018 : The first orbit raising operation of GSAT-6A Satellite has been successfully carried out by LAM Engine firing for 2188 sec from 09:22hr IST on March 30, 2018. Orbit Determination results from this LAM firing are: - apogee X perigee height was changed to 36412 km X 5054 km. - Inclinati...
by prasannasimha
30 Mar 2018 16:06
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

https://www.isro.gov.in/sites/default/files/galleries/%E0%A4%AA%E0%A5%80%E0%A4%8F%E0%A4%B8%E0%A4%8F%E0%A4%B2%E0%A4%B5%E0%A5%80%20%E0%A4%B8%E0%A5%80-37%20/%20%E0%A4%95%E0%A4%BE%E0%A4%B0%E0%A5%8D%E0%A4%9F%E0%A5%8B%E0%A4%B8%E0%A5%88%E0%A4%9F%20-2%20%E0%A4%B6%E0%A5%8D%E0%A4%B0%E0%A5%83%E0%A4%82%E0%A4%9...
by prasannasimha
30 Mar 2018 16:02
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

^ you can see the foam layer dropping off. You can see one foam panel near the rocket near the PSLV logo actually dropping off and like the quick change in magic shows the lower painted PSLV is seen. (They paint both the foam layer and the actual rocket in the same manner.(Liquid stages only)
by prasannasimha
30 Mar 2018 13:07
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Not just for LOX-H2 but also during loading of the hyper b golic liquid propellant . You will see the same insulator foam dropping off during launch of PSLV if you carefully look. The foam cover is made to look like the rockets external surface so it is not obvious but us seen when dropping off at l...
by prasannasimha
29 Mar 2018 23:49
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

50% is impossible. The net pressure increase was 6% The statement was that with 5(L40 +GS2) and other improvements the payload can be increased up to 3 Tons from 2.5 Tons which would be an 16% approx. Each Vikas engine upgrade would lead to a 70 Kg increment of the final payload mass (ie 350 Kgs and...
by prasannasimha
29 Mar 2018 17:11
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

Altitude achieved now velocity is being increased prior to finishing movement to argument of perigee point
by prasannasimha
29 Mar 2018 17:06
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

No they ahve shown the velocity time plot in between and it is nominal. Last it was at 5.8Kms/sec
by prasannasimha
29 Mar 2018 17:02
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

GS2 SEPARATED CRYOGENIC STAGE IGNITION CONFIORMED
by prasannasimha
29 Mar 2018 17:00
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2481
Views: 429275

Re: Indian Space Programme Discussion - Sept 2016

2nd stage performance normal
Payload fairing separated

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