Search found 69 matches

by krishGo
23 Aug 2019 01:24
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

SaiK wrote:wouldn't we be landing on the dark side?


No! The planned landing site is on the visible side of the moon to south. Check the image posted by SSSalvi sir above.
by krishGo
22 Aug 2019 04:12
Forum: Strategic Issues & International Relations Forum
Topic: Out-of-India - From Theory to Truth: Part 2
Replies: 5240
Views: 455852

Re: Out-of-India - From Theory to Truth: Part 2

Prof B B Lal on OIT & archeological findings on the itihasas

by krishGo
19 Aug 2019 03:27
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

GSLV Mk3 with SC120 will be 2.89 mtrs shorter than GSLV Mk3 with L110 core. It is also very likely that the SC120 will be ground lit.Interesting times ahead! Any idea as to the burn time for the SC120. Because it has to burn for some time after the S200 boosters separate. If so, that will definitel...
by krishGo
18 Aug 2019 22:06
Forum: Strategic Issues & International Relations Forum
Topic: Balwaristan
Replies: 85
Views: 7471

Re: Balwaristan

Cross Posting OK, is there a dhaga for Balwaristan like there is for Balochistan? I think attention needs to focus on these two now. Jammu-Kashmir is ***(Yaaaawn)**** soo July 2019 news. https://www.indiatoday.in/india/video/pok-activist-senge-sering-exposes-how-pakistan-has-been-changing-gilgit-bal...
by krishGo
09 Aug 2019 02:59
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

The most efficient way to get to the moon, is the 2 burn Hohmann transfer. This is what the Apollo, LRO, Change etc have done. Us using the mutli burn, orbit raising transfer, is due to combination of constraints like limited launcher capability, experience etc. (more of the former). An efficient u...
by krishGo
09 Aug 2019 02:35
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Well, TERLS can theoretically still launch payload to Polar orbits. But the problem is the small sounding rocket launchpad cannot scale up. The launchpad is surrounded by thick human habitation (there is an SBI 500 m away from the launcher :lol: ). Expansion would cost a lot of money as it is valua...
by krishGo
04 Aug 2019 17:37
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

This is why I wanted to discuss the use of the new 800N engine that ISRO has developed for the lander as a future LAM engine. And electric propulsion for future interplanetary missions. In the latter case, the thrust and TWR is actually very low. EPS wins because its ISP is 10 times better than eng...
by krishGo
30 Jul 2019 02:09
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

looks like those NGOs have woken up in TN :-? .. wont thiruvananthapuram be a better bet, it already has the TERLS Well, TERLS can theoretically still launch payload to Polar orbits. But the problem is the small sounding rocket launchpad cannot scale up. The launchpad is surrounded by thick human h...
by krishGo
26 Jul 2019 17:28
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

It seems the Second Launch center will be coming up at Kulasekarapattinam The committe looking into possible locations for the new location for a luch complex seems to have zeroed in on Kulasekarapattinam. Gujarat, Kanyakumari seems like the other options they looked into. The main criteria for the...
by krishGo
26 Jul 2019 03:42
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

1. Is ISRO focusing on larger LAM engines? 2. I thought GiSAT was going to be PAM-G based. But it has been dropped for LAM. Any thoughts on LAM versus PAM-G? 1. More thrust isn't that big of a concern for onboard engines. Efficiency is much more important factor. ISRO has been working on ion propul...
by krishGo
26 Jul 2019 02:32
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Chandrayaan 2 Raising Schedule: 24 JUL 19: 14:00-15:30 241.5 x 45,162 Km 26 JUL 19: 01:00-02:00 262.9 x 54,848 29 JUL 19: 14:30-15:30 281.6 x 71,341 02 AUG 19: 14:00-15:00 262.1 x 89,743 06 AUG 19: 14:30-15:30 233.2 x 143,953 Translunar Insertion 14 AUG 19: 03:00-04:00 278.4 x 412,505 Km Lunar orbi...
by krishGo
26 Jul 2019 02:10
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

The existing L110 2nd stage of the GSLV MkIII could be scaled up and use 4 S200 SRBs to lift a payload of over 12 tons. Of course the HLV is in development for 2024 to take up over 10 tons GTO. Perhaps sights should be set to lift 100 tons GTO? Maybe budgets aren’t there to do that. And look what w...
by krishGo
25 Jul 2019 05:09
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

A question for the gurus - does the apogee matter more than the perigee in this scheme of things? Seems like the apogee is bang on after the 1st raising while the perigee has a shortfall of 10 km achieved - 230 X 45163 km planned 241.5 x 45162 km. Did the orbit raising validate the new LAMs? True f...
by krishGo
24 Jul 2019 00:01
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

A question on today's launch: In previous launches I have seen ignition before t-0 and actual liftoff at t-0. In today's launch ignition was at t-0 and liftoff about 2 seconds later. Any reason behind that or just some adjustment of the clock!! A rocket "lifts off" when its Thrust to Weig...
by krishGo
23 Jul 2019 01:32
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Thanks Amber G. Even today's giants like the Falcon Heavy and Delta IV Heavy pale in comparison to the absolute monster that was the Saturn V. It was built for only one mission - taking the Apollo missions to the moon as fast as possible. Complete overkill for any other kind of mission like satelli...
by krishGo
23 Jul 2019 00:02
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

There is no such thing as 'over performed' in engineering. Either it is to design parameters or it is not. The burn was "burn to depletion" allowing a higher apogee. The commentators did a great job explaining this during the launch. Usually the close loop monitoring system will cut off t...
by krishGo
16 Jul 2019 02:58
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Correction. Not SITVC but flex nozzles with mechanical actuators. Right, thanks for correction. GSLV MkIII does have SITVCs attached on the SRB. Since the flex nozzles with mechanical actuators is to control in pitch and yaw plane, I am assuming that the SITVCs are for roll control on GSLV Mk III. ...
by krishGo
16 Jul 2019 02:41
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

^^^I don’t see the rush. Why not wait until end of August or October when moon perigee is the best and the launch pad isn’t being used for other launches? Either that or the leak was so small they know exactly where it is as opposed to actually being in the C25 3rd stage. Does anyone know if the 2n...
by krishGo
15 Jul 2019 03:19
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

https://twitter.com/isro/status/1150512237045379072 A technical snag was observed in launch vehicle system at T-56 minute. As a measure of abundant precaution, #Chandrayaan2 launch has been called off for today. Revised launch date will be announced later. The next attempt would only be in the next...
by krishGo
15 Jul 2019 03:13
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Not a big deal just curious what is so important that usually SRDE Isro has chosen to a tfta night launch. Curiosity comes from the fact that I don’t remember ISRO ever launching a rocket at the night time before? There have been several launches by ISRO in the night. I believe one of the recent PS...
by krishGo
15 Jul 2019 03:01
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

ISRO set a launch window of 9-16 July. If for a minor reason like weather, a delay, then they can still launch in the next day or so. If there is a technical problem, then another date will have to selected. It’s more important to get this right rather than rushing. It is also interesting as to wha...
by krishGo
15 Jul 2019 02:53
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Why is the payload removed and reassembled? Is it to drain out the (hydrazine?) propellent in the payload? Something else? Re-charge batteries? Well, we should remember that staellites are made to operate in vacuum. If the next launch date is too far away, then to preserve some of the sensitive equ...
by krishGo
15 Jul 2019 02:45
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

Gagan wrote:"Technical Hold"
Cryo fuel filling must have been completed by now...
7000 people in the launch gallery


News channels reporting scrub.
by krishGo
15 Jul 2019 01:27
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

ISRO set a launch window of 9-16 July. If for a minor reason like weather, a delay, then they can still launch in the next day or so. If there is a technical problem, then another date will have to selected. It’s more important to get this right rather than rushing. It is also interesting as to wha...
by krishGo
14 Jul 2019 22:13
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

At 3AM IST in Chennai, there is significant 94% cloud cover and a 36% chance of precipitation with 83% humidity. INSAT images from 14 July at 19:00 IST are showing significant cloud build up to the west and there could be a thunderstorm at the time of launch. I do not wish for the GSLV MkIII-M1 to ...
by krishGo
13 Jul 2019 04:46
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 269205

Re: Chandrayan-2 Mission

There are a lot of variables in such a complex mission. Disha and others have already go over some of the aspects of could go wrong. IMO these are the critical milestones in the mission 1. Ignition of C-25 & successful operation While the ignition, successful operation of solid boosters & L1...
by krishGo
25 Jun 2019 01:09
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

gaurav.p wrote:found this while lurking around twitter.


Cool! I believe this was issued to the IAM personnel who will be involved in selecting the vyomonaut candidates from the IAF.
by krishGo
20 Jun 2019 23:56
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Not at all an expert. The Mk3 should theoretically be able to put around 2 tons on a direct transfer (2 burn Hohmann orbit) to moon. I am not entirely sure if it can actually do that. This transfer requires the rocket to make a long upper stage burn at apogee to be the most efficient. This requires ...
by krishGo
20 Jun 2019 02:05
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

"Examples are them not planning to do an unmanned orbital test flight before the actual manned flight..." There are two or three unmanned flights of the space capsule before the manned one. From WIKI: Following two uncrewed flight demonstrations of the spacecraft, a crewed Gaganyaan is sl...
by krishGo
18 Jun 2019 04:22
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Docking technology should be developed prior to human space flight lest the astronauts be marooned. Is there a common standard for docking mechanisms and interlocks? Note this is not essential for rescue but would make things easier. Well, usually docking isn't seen as an critical technology for hu...
by krishGo
18 Jun 2019 03:59
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Perhaps since the temp can go to approx 100 K which could impair the operations of the rover equipment? Any details from Gurus? IMO Temperature gradient is the bigger problem than power generation. There was some talk of ISRO using Russian RHU / RTG, which would keep the critical components warm an...
by krishGo
28 Feb 2019 03:03
Forum: Military Issues & History Forum
Topic: Armoured Vehicles: News & Discussion
Replies: 235
Views: 60817

Re: Armoured Vehicles: News & Discussion

From Aero India 19 - Check from 6:20 in the video

BEML is developing a new 1500 hp engine to power "the main battle tank"

by krishGo
28 Feb 2019 02:45
Forum: Military Issues & History Forum
Topic: Naval Tejas Mk1/Mk2: News & Discussion - 23 February 2019
Replies: 669
Views: 143224

Re: Naval Tejas Mk1/Mk2: News & Discussion - 23 February 2019

JTull wrote:So LCA Navy Mk2 will come before MWF.


Looks like that if we take into account that metal cutting for MWF is about to start whereas Navy Mk2 is already in (early stages of?) fabrication. Atleast the first flight of Navy Mk2 should be before that of MWF.
by krishGo
18 Feb 2019 00:18
Forum: Military Issues Archive
Topic: Pulwama Attack
Replies: 2282
Views: 194527

Re: Pulwama Attack

How sensible is retaking Gilgit Baltistan (or some parts of it) as a reply ? Due to the terrain, it's obviously much more challenging than raiding accross the Kashmiri part of PoK, but will also mean Pakistan will not be anticipating such an attack. I remember reading how something like this could b...
by krishGo
17 Feb 2019 17:48
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Wonder why they used Ariane instead of GSLV for GSAT 31 Short answer, capacity limits. Currently ISRO can fly a maximum of 2 Mk3's every year. One of those flights this year will be of the Chandrayaan-2, a very important mission. Why limitations? Producing enough cryogenic engines & stages is w...
by krishGo
23 Jan 2019 00:53
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4069
Views: 873905

Re: Indian Space Program: News & Discussion - Sept 2016

Any reason they don't use CE-7.5 as upper stage for PSLV (with a 5+ km/s delta v it could possibly replace 3 and 4 stage)? Is it due to cost? Cost & Complexity! PSLV was always aimed to be a low cost launch vehicle that would serve as the workhorse. Adding a cryogenic stage will rise the costs ...
by krishGo
07 Apr 2018 05:12
Forum: Strategic Issues & International Relations Forum
Topic: Out-of-India - From Theory to Truth: Part 2
Replies: 5240
Views: 455852

Re: Out-of-India - From Theory to Truth: Part 2

17000+ years of unbroken Vedic civilization https://youtu.be/3tsyzrDg2n4 Thanks Nileshji! Watched it in entirety. It was a really interesting! My question is regarding a claim that is commonly made on our ithihasas, shruthi, smritis. The claim is that, the texts are not static and verses have been ...

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