Author Topic: GSLV MK-III D2 - GSAT-29 - November 14, 2018 (11:38 UTC)  (Read 94586 times)

Offline worldtimedate

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #20 on: 06/13/2018 02:43 am »
If by "Load capability" they mean maximum payload capacity than that is indeed disappointing. MK-3 was intended to have GTO capacity of 4 tons from the start. However it would explain why the inclusion of the SC-200 core would only increase GTO capacity to around 5.5 ton instead of 6.5 ton given the shortfall in base config performance.

It is disappointing to note that ISRO always projects the payload capability of a launch vehicle higher than the initial payload capability of the launch vehicle. This trend was noticed in the development of PSLV, GSLV MK-II, GSLV MK-III and I presume will continue in the development of Semi Cryogenic Engine based UMLV and RLV too. GSLV MK-II - which was supposed to go beyond 2.5 ton payload capability sooner than later, or might reach 3.2 ton because of the uprated Vikas - 2 Engine and the Cryogenic Engine CE-7.5 upgrade - hasn't yet reached the initially projected payload capability of 2.5 ton, in spite of the launch vehicle being under development more than 15-16 years. In the case of PSLV's Sun-synchronous-Orbit payload capacity of 1,750 Kg wasn't attained in a year. It took ISRO many years to attain that payload capacity.

It is more disappointing of GSLV MK-III being a two stage vehicle to have an initial capacity of just 3.1 ton with a massive launch mass of 630 ton. This implies that core stage L110 is not efficient enough to raise the payload capacity. I would've liked GSLV MK-III to have a 3 stage vehicle with another stage propelled by Vikas - 2 engine on top of it.

This is how China's Long March 3B has achieved a payload capacity of 5.2 to 5.5 ton with 3 stage vehicle ( First Stage with 4 boosters ), until they have developed powerful Semi-cryogenic engine YF-100  ( 1200 kn thrust ) and using 2 of them in the boosters – CS-5-300 and cryogenic engine YF--77 ( 700 kN thrust ) and clustering 2 of these YF-77 Cryogenic Engines, they have developed the First stage - CZ-5-500 for Long March 5. Their Long March 5 is a matter of envy to the US, European, Japanese and the Russian Launch Vehicles. But ISRO is hesitant to develop cryogenic engine for the core stage on the excuses that cryogenic propellants are cumbersome to handle with. Despite the initial hiccup, this Long March 5 will sooner or later emerge as a leading Launch vehicle, by surpassing Ariane 5, Delta_IV Heavy, Falcon 9, Soyuz, Zenit, Proton, HIIA etc but only to be surpassed by Falcon Heavy 9 Heavy which I think nothing but a Delta IV heavy type clone with two similar boosters attached around to gain 2 to 3 times payload.

Such is the thrust attainable by Cryogenic Engine that such cumbersomeness in handling the propellants can be compensated for the stupendous amount of payload gain. ISRO’S approach to develop a 2 stage Launch vehicle is fraught from the conception because of the lack of a powerful core stage such Ariane - 5 first stage. Delta IV first stage, Falcon first stage. ISRO spent so many valuable years developing and mastering the cryogenic engine technology against the backdrop of arm-twisting by US technology denial regime through MTCR that gave lot of heartburn to the Indian rocket and missile technologists by forcing them to develop everything from scratch. So, after such toiling work, is it wise of ISRO not to pursue the core stage cryogenic engine development?

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Offline sojoner

Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #21 on: 06/13/2018 07:00 am »
By now we all know in these years how ISRO operates. Being a government run show this is very much excepted. I
would say ISRO is doing a great job despite all red tape and politics. They  should be more focused towards mastering  one of the launch vehicle and payload  capacity  instead of juggling between  MK2,MK3, RLV which really not what expected out of ISRO. Don't  be surprised if GSAT29 slips to August.

Offline input~2

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #22 on: 06/16/2018 04:09 pm »
 http://www.thehindu.com/sci-tech/science/isro-plans-next-launch-mission-in-aug/article24175171.ece

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The Indian Space Research Organisation (ISRO) has slated its next launch mission, an Earth observation satellite, tentatively for August. The last one was in April.The upcoming episode will include 25 to 30 small secondary foreign satellites as passengers on the light payload lifting rocket, PSLV-C42.
Does this mean that GSLV MkIII D2 launch is postponed until September?

Offline TheVarun

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #23 on: 06/16/2018 04:56 pm »
 Yes, what about that?  GSLV Mark 3 was originally supposed to be launched in May-June. And then July was mentioned. Is this just an oversight by the media, or misunderstanding i.e they mistook "next PSLV launch" for "next launch".   I'm still keeping my fingers crossed for a July lift-off. 

Offline russianhalo117

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #24 on: 06/17/2018 02:37 am »
Yes, what about that?  GSLV Mark 3 was originally supposed to be launched in May-June. And then July was mentioned. Is this just an oversight by the media, or misunderstanding i.e they mistook "next PSLV launch" for "next launch".   I'm still keeping my fingers crossed for a July lift-off. 
Actually December 2017 then February and so on.

Offline Jajar

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #25 on: 06/24/2018 08:43 am »
I think GSAT-29 won’t be launched until September or even October.

Offline TheVarun

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #26 on: 06/25/2018 05:12 pm »
"I think GSAT-29 won’t be launched until September or even October."

 Then there should be a number of launches around that time or before. Besides the PSLV with 30 odd satellites, there's a scheduled GSLV Mark 2 with GSAT-7A, the Chandrayaan-2 mission, plus one more PSLV with an IRNSS. Also, GSAT-11 via Ariane.

Offline russianhalo117

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #27 on: 06/25/2018 06:06 pm »
When does FLP shut down for conversion and modernisation??

Offline input~2

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Re: GSAT-29 - GSLV MK-III D2 2018 2nd half
« Reply #28 on: 07/05/2018 06:07 am »
ISRO page updated, now reads:
Quote
GSLV-MkIII-D2/GSAT-29 Mission is scheduled to be launched during the second half of  2018.
https://www.isro.gov.in/gslv-mkiii-d2-gsat-29-mission
« Last Edit: 07/05/2018 06:31 am by input~2 »

Offline rajesh dharmadhikari

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Re: GSAT-29 - GSLV MK-III D2 - 2018 2nd half
« Reply #29 on: 07/05/2018 06:30 pm »
why isro gives timelines in terms of quarters and half year. why it does not declare date of launch  like other agencies do? date is declared only when rocket is present on launchpad.

Offline Jajar

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Re: GSAT-29 - GSLV MK-III D2 - 2018 2nd half
« Reply #30 on: 07/13/2018 05:51 am »
I don’t think the rocket or even for that matter, the satellite are ready. Besides, don’t forget, the monsoon season is upon us. Hence, I don’t think there will be any launch activity at SHAR, before September earliest or even October. The problem is that more the delays, the more bottlenecks, the more pressure the scientists at ISRO are going to face.

Offline TheVarun

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Re: GSAT-29 - GSLV MK-III D2 - 2018 2nd half
« Reply #31 on: 07/13/2018 12:18 pm »
 Not meaning to nitpick, but the monsoon by itself can't be the reason for launches being put off. Off the top of my head, there were launches in June, July and August in previous years. There was that launch of 5 UK satellites in July 2015, the IRNSS-1 in July 2013, launches in 2010 and 2011 in July, also a GSLV in August 2015. I'm certain there have been more.  Or were they sure that the monsoon had subsided for several days in those missions, whereas now there has been no let up in the rains? That's possible I guess

Offline abhishek

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Re: GSAT-29 - GSLV MK-III D2 - 2018 2nd half
« Reply #32 on: 07/15/2018 02:54 pm »
Successful Qualification of High Thrust Vikas Engine

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Today (July 15, 2018), a high thrust version of the Vikas Engine was successfully qualified through a ground test for a duration of 195 seconds at ISRO Propulsion Complex (IPRC), Mahendragiri, Tamilnadu. Vikas Engine is the workhorse liquid rocket engine powering the second stage of India’s Polar Satellite Launch Vehicle (PSLV), second stage and the four strap on stages of Geosynchronous Launch Vehicle (GSLV) and the twin engine core liquid stage (L110) of GSLV Mk-III.
This ground test has validated the performance adequacy of the Vikas Engine for its use in the upcoming second developmental flight of GSLV Mk-III

https://www.isro.gov.in/update/15-jul-2018/successful-qualification-of-high-thrust-vikas-engine
« Last Edit: 07/15/2018 02:56 pm by abhishek »
10, 9, ignition sequence start 6, 5, 4, 3, 2, 1, 0, all engines running Lift off, we have a lift off, lift off

Offline worldtimedate

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Re: GSAT-29 - GSLV MK-III D2 July 2018
« Reply #33 on: 08/12/2018 10:01 pm »
"I think GSAT-29 won’t be launched until September or even October."

 Then there should be a number of launches around that time or before. Besides the PSLV with 30 odd satellites, there's a scheduled GSLV Mark 2 with GSAT-7A, the Chandrayaan-2 mission, plus one more PSLV with an IRNSS. Also, GSAT-11 via Ariane.

ISRO Chairman confirms that GSLV MK-III D2 will launch GSAT-29 in October, but no details like Satellite payload has been given.

Quote
After a dull period this year, launch activity will pick up pace from September, first when the space agency will launch two UK satellites- dedicated commercial launches- on the PSLV-c42. In October, the GSLV MK-III D2 will launch the GSAT-29, following which the PSLV-c43 will launch a hyper-spectral imaging satellite with 30 commercial co-passengers.

Source : Isro aims to launch 22 missions in 2019; 50 in 3 years
« Last Edit: 09/02/2018 10:54 pm by worldtimedate »

Offline worldtimedate

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #34 on: 09/02/2018 10:58 pm »
Does anyone know the launch mass of GSAT-29 ? Can we expect a 3.7 ton satellite launch with the GSLV MkIII-D2 as the Vikas Engine has been uprated ?

Quote
In October, Isro will launch GSLV MkIII-D2, also known as 'bahubali'. This will be the second launch of Isro's most powerful rocket with 4-tonne lifting capability. The rocket will lift off with GSAT-29 satellite with multi-beam and optical communication payloads, which will help bridge the digital divide in rural regions.

Source : Isro to launch 19 missions in just 7 months

Offline Jajar

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #35 on: 09/16/2018 08:59 pm »
When is GSAT-29 going to be launched ? Any exact date ?

Offline worldtimedate

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #36 on: 09/17/2018 01:34 am »
When is GSAT-29 going to be launched ? Any exact date ?

Getting the exact date for the GSAT-29 launch is not possible. But what Dr. Sivan said after the launch of PSLV-42, we can assume that GSLV MK-III launch is on track, unless some unexpected things crop up. As ISRO is focused on launching Chandrayaan-2 between January 3 to February, ISRO would not delay launching GSLV MK-III D2. Because the more delay happens for launching GSLV MK-III D2, the more delay will be for launching other mission specially the manned space flight.

Quote
Outlining the road map for ISRO, Mr. Sivan said the next six months will see 18 missions - 10 satellite missions and 8 launch vehicle missions. "We are almost going to have one launch every two weeks. Definitely the load on us is going to be huge," he said.

Quote
Among the slew of launches scheduled over the next few months, the much-awaited and delayed, India's second lunar mission, Chandrayaan-2 finally has a launch window.

"Chandrayaan-2 is planned for a window from January 3 to February 16, 2019 that we are targeting. It can happen anytime during that window. But we are aiming for the beginning of the window, January 3," Mr. Sivan said.

"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."

Source : ISRO launches two U.K. satellites

Offline TheVarun

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #37 on: 09/17/2018 07:05 pm »
 Yesterday an ISRO official was quoted as saying that the GSLV Mark 3 D-2 with GSAT-29 will be launched in December. Is this correct, or is the media misquoting ISRO and confusing two different missions?  Until just yesterday, all the reports were speaking of an early October( or at least an October) launch. What could have changed so suddenly?

Offline Jajar

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #38 on: 09/18/2018 05:20 am »
My understanding was that it was meant for October launch. However, you know how it is... I wouldn’t be surprised that the launch is delayed until November at least. Remember we are talking about gslv mk III, so they want to take their own time in order to ensure that they get it right.

Offline worldtimedate

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Re: GSAT-29 - GSLV MK-III D2 - October 2018
« Reply #39 on: 09/18/2018 06:53 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.

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