Author Topic: GSLV MK-III D2 - GSAT-29 - November 14, 2018 (11:38 UTC)  (Read 94784 times)

Offline srikanthr124

  • Member
  • Posts: 36
  • india
  • Liked: 26
  • Likes Given: 13
Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #40 on: 09/18/2018 09:07 am »
I didn't have the chance to view the PSLV-42 launch video. So, I am not aware of what the ISRO officials said regarding the GSLV MK-III D2 launch. But in December, GSAT-11 is scheduled to launch. Who knows, the media may have mixed up GSAT-11 with GSAT-29 ? Then there is the GSAT-7A launch on the cards as well in November. But as far as defence and space related news is concerned, the Hindu's reporting is very credible. And if Dr. Sivan's words are to be believed quoted by the Hindu, then GSLV MK-III launch in on track.

Quote
"Right now with the status of the rocket, the GSLV Mk-3 M1, and the present status of the satellite, we are not expecting any more delay. At the same time tests are going on. If unexpected things happen, that may have some impact. But right now, we are not anticipating any delay."


At the moment, GSLV-MK-III D2 launch and its getting operationalized as early as possible is more desirable to me than the launch of any other PSLV missions. ISRO has to extricate itself from the dependence on ESA for launching heavy communication satellites by operationalizing GSLV MK-III. Moreover, GSLV MK-III has to undergo 10 launches including the two unmanned mission before the launch of India’s manned mission. I don't think it would be wise of ISRO to launch Chandrayaan-2 in January, next year without launching the GSLV-MK-III D2. But in the launch business, though the delay in launching a mission is frowned upon, yet it is unavoidable.

Post launch speech isro chairmen k.sivan clearly said next launch would be PSLV C43, Then after GSLV MK 3 D2 launch,In the next month
« Last Edit: 09/18/2018 10:27 pm by srikanthr124 »

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 39821
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 33662
  • Likes Given: 10409
Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #41 on: 09/18/2018 11:26 am »
Post launch speech isro chairmen k.sivan clearly said next launch would be PSLC C43, Then after GSLV MK 3 D2 launch,In the next month

He also said that GSAT 11 would be on 4 December, so that might be where the confusion came from.
« Last Edit: 09/18/2018 11:28 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #42 on: 09/20/2018 06:59 am »
Well it seems according to this article that the launch would take place in October.

https://bangaloremirror.indiatimes.com/bangalore/others/isros-gsat-29-launch-in-october/articleshow/65877621.cms

Offline TheVarun

  • Full Member
  • **
  • Posts: 255
  • CANADA
  • Liked: 51
  • Likes Given: 198
Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #43 on: 09/20/2018 04:25 pm »
^
And the Economic Times is carrying more or less the same article. So it's tantalising, but as of now, it does look like an October launch for GSLV Mark 3 D2 .

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #44 on: 09/22/2018 06:22 am »
If that is the case, then the cryogenic engine, the rocket components and the satellite itself must have arrived at SHAR by now right ?

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #45 on: 10/07/2018 07:03 am »
Guys, still no fresh date for GSAT-29 launch ? It was supposed to be for this month...

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #46 on: 10/07/2018 07:41 pm »
Yeah I guess it would be wise. Especially that now, we are in cyclonic period over south east India...

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #47 on: 10/23/2018 11:50 am »
Looks like GSAT-29 launch won’t happen before November...I’m thinking even December...looks like there are some issues concerning the integration of rocket components. Correct me if I am wrong...

Offline sanman

  • Senior Member
  • *****
  • Posts: 6315
  • Liked: 1490
  • Likes Given: 8
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #48 on: 10/24/2018 05:36 am »
This is just speculation but i think there are problems with GSAT-29 AND the MK3 D2 vehicle. The GSAT-29 is highly experimental in nature and contains technology that isro has no prior experience with so that might be causing some problems on the payload side. On the vehicle side the MK3 will undergo several upgrades through this D2 mission. Not only will high thrust vikas engines be used on L110 core stage for first time the C25 upper stage will stretched to C30 and burn time will go up from 640 seconds to around 800 seconds so that also brings in a lot of complexities. ISRO has given itself quite a challenge with a mission like this.

I'd read GSAT-29 can do upto 100Gbps through 104 different beams to countries across Southeast Asia -- so that's the "multi-beam". What exactly is this "optical communications" - is it laser communication?

Never knew that C25 has been extended to C30. Will it gradually be extended further on future missions, to gradually morph into ULV?

Offline srikanthr124

  • Member
  • Posts: 36
  • india
  • Liked: 26
  • Likes Given: 13
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #49 on: 10/27/2018 10:10 pm »
Attached news article makes mention of all upcoming missions of isro except D2 mission. Could the silence be interpreted as something has gone wrong?

News Article: http://www.andhrabhoomi.net/content/nation-8122

The News Article you mentioned above.

"జీఎస్‌ఎల్‌వీ మార్క్ 3-ఎఫ్ 11 రాకెట్ ద్వారా కమ్యూనికేషన్ రంగానికి చెందిన జీశాట్-7 ఏ ఉపగ్రహాన్ని రోదసీలోకి పంపనున్నారు. ఈ ప్రయోగ ఏర్పాట్లు కూడా రెండో ప్రయోగ వేదిక వద్ద చురుగ్గా సాగుతున్నాయి".
 
I think they have confused with GSLV MK3 D2 and GSLV MK2 F11 ( మార్క్ 3-ఎఫ్ 11).


Offline worldtimedate

  • Full Member
  • ****
  • Posts: 444
  • Liked: 40
  • Likes Given: 8
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #50 on: 10/29/2018 10:48 pm »
This is just speculation but i think there are problems with GSAT-29 AND the MK3 D2 vehicle. The GSAT-29 is highly experimental in nature and contains technology that isro has no prior experience with so that might be causing some problems on the payload side. On the vehicle side the MK3 will undergo several upgrades through this D2 mission. Not only will high thrust vikas engines be used on L110 core stage for first time the C25 upper stage will stretched to C30 and burn time will go up from 640 seconds to around 800 seconds so that also brings in a lot of complexities. ISRO has given itself quite a challenge with a mission like this.

I'd read GSAT-29 can do upto 100Gbps through 104 different beams to countries across Southeast Asia -- so that's the "multi-beam". What exactly is this "optical communications" - is it laser communication?

Never knew that C25 has been extended to C30. Will it gradually be extended further on future missions, to gradually morph into ULV?

To increase the payload of GSLV MK-III, C25 is already stretched to C28 with the loading of 28 ton fuel ( LOX + LH2 ).

source : GSLV Mk III

In the forthcoming launches when the GSLV MK-III capability will be raised, cryogenic upper stage will burn for 800 seconds, the test of which was conducted in February, 2016

Offline Lars-J

  • Senior Member
  • *****
  • Posts: 6817
  • California
  • Liked: 8522
  • Likes Given: 5415
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #51 on: 10/30/2018 02:02 am »
800 seconds? That’s more than 13 minutes... most launch vehicles burn time of all stages combined is less than 10 minutes. Can that be right?

Online Galactic Penguin SST

Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #52 on: 10/30/2018 02:24 am »
800 seconds? That’s more than 13 minutes... most launch vehicles burn time of all stages combined is less than 10 minutes. Can that be right?

It's actually in the ballpark of most LH2 upper stage of today (Centaur, Ariane 5 2nd stage etc.)
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery.

Offline worldtimedate

  • Full Member
  • ****
  • Posts: 444
  • Liked: 40
  • Likes Given: 8
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #53 on: 10/30/2018 07:39 am »
800 seconds? That’s more than 13 minutes... most launch vehicles burn time of all stages combined is less than 10 minutes. Can that be right?

Yes, the burn time is right. Even though C25 will normally burn for 640 secons, yet ISRO tested it to burn for 800 seconds with an increase of over 25% normal burn time. GSLV MK-III's core stage L110 burns for only 203 seconds with the loading of hypergolic propellant for first stage in a two stage launch vehicle. After that C25 upper stage propelled by 1 CE-20 cryogenic engine takes over to compensate for the less efficent core stage's performance.

GSLV MK-III
----------------
GSLV MK-III Upper Stage ( C25 now to be recristend as C28 ) with ( 1 CE-20 Cryogenic Engine ) has minimum burn time 640 seconds ( maximum 800 seconds ) with the loading of 27.8 ton propallant ( LH2 / LOX ) to generate 180 kN to 200 kN thrust with a specific impulse of 443 seconds

GSLV MK-III First Stage ( L110 ) with ( 2 Vikas Engines ) burns for 203 seconds with the loading of 116 ton propallant ( UDMH / N2O4 ) to generate 1,598 kN kN thrust with a specific impulse of 293 seconds

So total Burn time is 843 Seconds unless maximum 800 seconds is implemented

Quote
Stating that prior to stage development hot tests, three CE20 engines were realised and two engines were subjected to qualification tests in sea level conditions, ISRO said, this included 800 seconds duration hot test and the third engine identified for flight was tested in high altitude conditions for a duration of 25 seconds.

Quote
The space agency described the C25 stage as the "most powerful" upper stage developed by ISRO which uses Liquid Oxygen (LOX) and Liquid Hydrogen (LH2) propellant combination.

It said the stage carries 27.8 tonnes of propellants loaded in two independent tanks.

Source : GSLV MK-Cryogenic upper stage for GSLV MkIII tested successfully

Quote
The CE-20 was ignited and tested for 800 seconds from 5 p.m. to study the performance of the engine though the actual required duration was only 635 seconds.

During the actual flight of the GSLV, the engine will be ignited for only 635 seconds.

Source : GSLV MK-GSLV Mk III engine completes 'full endurance test'
Source : GSLV Mk III engine undergoes endurance test


Now lets take a look at some of the 3 top-notch launch vehicles's burn time and performance. Most of the powerful launch vehicles's burn time for first and upper stage is even higher than that of GSLV MK-III.

1 )

Atlas V
----------------
Atlas V Centaur Upper Stage with ( 1 RL 10A or 1 RL 10C Cryogenic Engine ) burns for 842 seconds with the loading of 20.83 ton propallant ( LH2 / LOX ) to generate 99.2 kN thrust with a specific impulse of 451 seconds

Atlas V Common Booster Core ( CBC ) First Stage with ( 1 RD-180 Semi Cryogenic Engine ) burns for 253 seconds with the loading of 284 to propallant ( RP1 / LOX ) to generate 4,152 kN thrust with a specific impulse of 337.8 seconds

So total Burn time is 1095 Seconds

2 )

Ariane 5
----------------
Ariane 5 Upper Stage ( ECA ) with ( 1 HM7B Cryogenic Engine ) burns for 945 seconds with the loading of 14.9 ton propallant ( LH2 / LOX ) to generate 62.7 kN thrust with a specific impulse of 446 second

Ariane 5 Core Stage ( ECA, ES ) with ( 1 Vulcain 2 Cryogenic Engine ) burns for 540 seconds with the loading of 170 ton propallant ( LH2 / LOX ) to generate 1,340kN thrust with a specific impulse of 432 seconds

So total Burn time is 1485 Seconds


3 )

Delta IV Heavy
----------------
Delta IV Heavy Upper Stage ( DCSS ) with ( 1 RL10-B-2 Cryogenic Engine ) burns for 1125 seconds with the loading of 27.2 ton propallant ( LH2 / LOX ) to generate 110 kN thrust with a specific impulse of 462  seconds

Delta IV Heavy Common Booster Core ( CBC ) First Stage with ( 1 RS-68A Cryogenic Engine ) burns for 328 seconds with the loading of 27.2 ton propallant ( LH2 / LOX ) to generate 3,140 kN thrust with a specific impulse of 412  seconds

So total Burn time is 1453 Seconds
« Last Edit: 10/30/2018 07:41 am by worldtimedate »

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #54 on: 10/30/2018 07:55 am »
Quick question. I understand that GSAT-29, like GSAT-20 and another one, GSAT-19 (which I believe is already in orbit) will form part of the trinity of satellites part of Modi’s Digital India program. Given the delay in launching GSAT-29 and GSAT-20, is the Government worried ? Isn’t there any pressure coming from them ?

Offline sanman

  • Senior Member
  • *****
  • Posts: 6315
  • Liked: 1490
  • Likes Given: 8
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #55 on: 10/30/2018 08:51 am »
800 seconds? That’s more than 13 minutes... most launch vehicles burn time of all stages combined is less than 10 minutes. Can that be right?

Yes, the burn time is right. Even though C25 will normally burn for 640 secons, yet ISRO tested it to burn for 800 seconds with an increase of over 25% normal burn time. GSLV MK-III's core stage L110 burns for only 203 seconds with the loading of hypergolic propellant for first stage in a two stage launch vehicle. After that C25 upper stage propelled by 1 CE-20 cryogenic engine takes over to compensate for the less efficent core stage's performance.

Also, I think that launch geography imposes the lower cap on the core-stage delta-V, which has to be made up for by  increased delta-V requirement for upper stage. Again, just so that core stage doesn't fall on Indonesia, Thailand, Malaysia, etc on the far side of the Bay of Bengal.

Offline Lars-J

  • Senior Member
  • *****
  • Posts: 6817
  • California
  • Liked: 8522
  • Likes Given: 5415
Re: GSAT-29 - GSLV MK-III D2 - November 2018
« Reply #56 on: 10/30/2018 03:10 pm »
800 seconds? That’s more than 13 minutes... most launch vehicles burn time of all stages combined is less than 10 minutes. Can that be right?

It's actually in the ballpark of most LH2 upper stage of today (Centaur, Ariane 5 2nd stage etc.)

D'oh... For some reason I thought the number was for the core stage. Never mind! :)

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - 14th November 2018
« Reply #57 on: 10/31/2018 08:19 am »
Strange....the article states the that GSAT satellite will have the capacity to monitor the entire country round the clock. For me, it looks more than a Cartosat satellite that would be launched. Correct me if I’m wrong...


Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - 14th November 2018
« Reply #58 on: 10/31/2018 10:54 am »
Ok. I didn’t know that. Brilliant ! So GSAT-29 in mid November, then GSAT-11 in early December. So things are on the up for ISRO!

Offline Jajar

  • Full Member
  • *
  • Posts: 130
  • Liked: 4
  • Likes Given: 0
Re: GSAT-29 - GSLV MK-III D2 - 14th November 2018
« Reply #59 on: 10/31/2018 01:10 pm »
So the Second Vehicle Assembly Building (SVAB) is already fully operational ? Great !

Tags:
 

Advertisement NovaTech
Advertisement
Advertisement Margaritaville Beach Resort South Padre Island
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
1