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Search found 524 matches

by prasannasimha
18 Feb 2018 23:18
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

The moon rotation and revolution time is the same so the same face faces us all the time so during the new moon period the sun will not light up the moon surface for 15 days so a given point on the moon will be illuminated for 15 days (lunar day) and 15 days will be dark(lunar night)
by prasannasimha
18 Feb 2018 23:17
Forum: Military Issues & History Forum
Topic: India's R&D in Defence DRDO, PSUs and Private Sector
Replies: 2911
Views: 192770

Re: India's R&D in Defence DRDO, PSUs and Private Sector

CEMILAC certification is for military use. Civilian certification is more stringent.
by prasannasimha
18 Feb 2018 17:55
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

The real issue is the weight - an Agni will weigh much more than a windmill blade isn't it? F=ma will rule
by prasannasimha
18 Feb 2018 07:47
Forum: Technology & Economic Forum
Topic: Indian Economy News & Discussion - Nov 27 2017
Replies: 742
Views: 90135

Re: Indian Economy News & Discussion - Nov 27 2017

Actually private banks all over the world have caused bigger problems and had to be bailed out by government money when too big to fail or for investor concerns. Thinking everything will be sorted put by privatization is nonsense. Just see the Oh so good service at private banks. Masters at ripping ...
by prasannasimha
17 Feb 2018 22:30
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

There is no mention as individual components are not mentioned. Pad abort test is going to be done this year.
by prasannasimha
17 Feb 2018 20:15
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

This test was likely a tight corner turn test
by prasannasimha
17 Feb 2018 20:14
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

^ This is not for cross country mobility like the ones on the Russian Steppe but for cross road mobility in various "depot"s and this will not be the actual open trailer but obviously covered and camouflaged
by prasannasimha
17 Feb 2018 18:56
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

HUMAN SPACEFLIGHT cancelled.... http://www.indiabudget.gov.in/ub2018-19/eb/sbe91.pdf Notes on Demands for Grants, 2018-2019 No. 91 Department of Space DEPARTMENT OF SPACE DEMAND NO. 91 Department of Space, in the above URL, :D , jingos can replace number 91 in sbe 91 with numbers 19 or 20 or 21 or ...
by prasannasimha
16 Feb 2018 10:18
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

^ the entire podcast had nothing in it worthwhile. I wish there was a transcript that could have been glossed over.
by prasannasimha
15 Feb 2018 22:41
Forum: Technology & Economic Forum
Topic: Indian Biotech News & Discussion
Replies: 396
Views: 78081

Re: Indian Biotech News & Discussion

IISc is doing a lot of work on microfluidics
by prasannasimha
15 Feb 2018 08:13
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

The primary reason for not using parachute landing by SpaceX was the inability to autonomously control the parachute drop due to cross winds for precise landing. Tgey could not do it in initisl tests o opted for vertical landing
by prasannasimha
12 Feb 2018 22:52
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

If the payload repackaging came down by 100o Kg then would it be possible using the weight to range curve be calculated ?I think the curves for Agni 1 and 2 were done isnt it.Also could the percentage of net weight reconfiguration in the multistage rocket equation be done to calculate the new total ...
by prasannasimha
11 Feb 2018 08:05
Forum: Military Issues & History Forum
Topic: Tejas: News & Discussions: 09 February 2018
Replies: 94
Views: 18020

Re: Tejas: News & Discussions: 09 February 2018

The first aircraft is now in the HAL museum in Bangalore. I think another us on static display in front of the HALoffice in Minsk square
by prasannasimha
08 Feb 2018 22:23
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

If I remember right LPSC team wants to do vertical landing of the boosters and the RLV team an airbag landing
by prasannasimha
08 Feb 2018 22:20
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

https://www.gadgetsnow.com/tech-news/like-space-x-isro-working-on-reusable-rocket-stages/articleshow/62831072.cms Like SpaceX, Isro, too, has been working on reusable technology. The Isro chief told TOI, "Our research and development department is working on three technology demonstrators. Fir...
by prasannasimha
08 Feb 2018 07:26
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

If they are targetting Mars aerobrsking will not be efficient and not possible if they use an interim moon base
by prasannasimha
08 Feb 2018 00:19
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

I think the reentry with the flip and controlled reentry is having a lesser reentry heat penalty than the glide aerobraking as speeds are different. The retrorocket firing is an active speed dissemination whereas aerobraking relies on friction to reduce speed causing greater heating.
by prasannasimha
07 Feb 2018 22:36
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 461911

Re: LCA: News & Discussions: 15 August 2017

^ I think there is an 8 line with 8 planes in various stages and a 1/2 line of 4 per year. here is one picture of multiple planes in various stages of assembly by Tarmak. If we look at that we will probably get an idea.
by prasannasimha
07 Feb 2018 15:58
Forum: Military Issues & History Forum
Topic: Indian Space Programme Discussion - Sept 2016
Replies: 2226
Views: 361290

Re: Indian Space Programme Discussion - Sept 2016

India is having its own reusable vehicle program. There are two competing teams with one trying rlv approach and the other like Elion musk with either verticle or airbag landing. There are old lot's with the concept planning. More importantly this year we will be having the satellite docking experim...
by prasannasimha
06 Feb 2018 22:59
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Navarea warning was 700 Kms but the test was done upto900 Kms - not sure how it was done or was it lobbed in a nonoptimal trajectory to simulate a 900 Km path ?
by prasannasimha
06 Feb 2018 14:41
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

The missile test was an Agni 1A missile which is not the same. 900 Km range and pith and yaw capability. Probably doing Marv testing . The reentry vehicle would be slower than a full ir or ic bm
by prasannasimha
06 Feb 2018 09:30
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 461911

Re: LCA: News & Discussions: 15 August 2017

How do you import into a different airframe the FCS of a totally diffent aircraft ?
by prasannasimha
04 Feb 2018 14:25
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Same for the Agni 2 test some say aborted,not launched and another says flew a few mms and destroyed !
We have done x test announcing y many times.
by prasannasimha
04 Feb 2018 08:12
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

The failed test was K4 not Agni series
by prasannasimha
03 Feb 2018 08:24
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

My real doubt is that during separation the decelerating 1st stage is being acted by stage shut off and retrofiring and gravity that makes an offset angle of the net vector of ist stage versus second stage so assymmetric firing may need to be done to prevent clash of the second stage nozzle. If i re...
by prasannasimha
03 Feb 2018 07:28
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

I think the issue is not stopping but the angle of the velocity vector of the 1st versus second stage during the firing when hot staging. Separation is a pretty violent event that induces perurberations
by prasannasimha
03 Feb 2018 05:20
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

PSLV's close loop guidance starts in the second stage around 2 minutes.
by prasannasimha
03 Feb 2018 04:03
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

700 kms test seems to have way point navigation.
by prasannasimha
03 Feb 2018 03:57
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Closed loop guidance takes over somewhere within the 4th to 15th minute depending on mission profile. I will have to reconfirm the timing. The person who did it is a venerable teacher now. Not sure 9f timing for all solid missile thoughwhere burn rate is dependent on train geometry and other modes a...
by prasannasimha
02 Feb 2018 07:07
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Isnt the first stage separation still in the atmosphere below the Karman line ? (Albeit in thinner atmosphere )
by prasannasimha
02 Feb 2018 07:03
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

^ that would be true if there was only a linear movement but these engines are still in boost phase but not truly ballistic with minor corrections going on all the time isnt it ? So during the firing of retromotors an ill timed vector could start a pitch or yaw that could make the lip of the first s...
by prasannasimha
02 Feb 2018 00:26
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Liquid based Id's like SS18and Dong feng would require ullage motors (if second stage are liquid )
by prasannasimha
02 Feb 2018 00:22
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

The problem of stage separation will not be just about firing synchronously bit also clean separation such that the separating first stage does not tumble or pitch/yaw during separation such that the lip of the separating 1st stage does not hit and damage the nozzle of the second stage motor all the...
by prasannasimha
02 Feb 2018 00:11
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

Incidentally hot staging has also been used in ISRO rockets over time
by prasannasimha
01 Feb 2018 23:34
Forum: Military Issues & History Forum
Topic: Indian Missiles News and Discussions - May 2017
Replies: 3064
Views: 498306

Re: Indian Missiles News and Discussions - May 2017

^^^^^^16 ton thrust by one poster does not mean retrorocket weighs that much ! The thrust may be high but duration od retrorocket firing is transient and dont weigh that much. The weight could be calculated using the thrust equation and putative near empty weight of the stage. The complexity of retr...

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