Author Topic: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)  (Read 20305 times)

Offline kanaka

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #40 on: 12/18/2018 07:51 am »
Neither ISRO website nor the ISRO twitter account hasn't yet updated any info on the launch time. I was expecting a 2.5 to 2.6 ton payload. It is rather disappointing to note the lesser payload mission life with this launch, despite the much fanfare with the uprated Hight Thrust Vikas engine which if it is used in this mission, GSLV MK-II's payload mass should have been higher. And then there is the uprated CUSI5. Will the CUS15 generate thrust in excess of 90 kN ?. This is the first time ISRO is attempting to launch a satellite into super synchronous orbit according to mission kit.
 
Does anyone know if the L40 strap-on booster will use the High Thrust Vikas engine as well. The mission brochure doesn't show any thrust for each stage. The Previous version of l40 Vikas engine used to generate thrust of 763 kN and the GS1 stage's Vikas engine used to generate thrust of 799 kN which should generate thrust of 846 kN. GSLV MK-II with a height of 51 meter can very much be compared with Long March 3A which with the similar height of 52.52 meter is capable of launching a satellite of 2.65 ton but with lesser lift off mass of 241 ton instead of 418 ton in the case of GSLV MK-II.

Time given

https://www.isro.gov.in/gslv-f11-gsat-7a-mission/watch-live-launch-of-gslv-f11-gsat-7a-dec-19-2018-1530-hrs-ist-onwards

Offline vineethgk

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #41 on: 12/18/2018 08:25 am »
GSLV MK-II with a height of 51 meter can very much be compared with Long March 3A which with the similar height of 52.52 meter is capable of launching a satellite of 2.65 ton but with lesser lift off mass of 241 ton instead of 418 ton in the case of GSLV MK-II.

The comparison between the masses of GSLV MkII and Long March 3A is a case of apples vs oranges. GSLV is heavier as it uses a solid core, while the Long March uses liquid core powered by a cluster of 4 Vikas-type engines.

In a way, one might argue that it would have been better had ISRO ditched the solid core, and instead clustered the 4 Vikas engines of L40 strapons into a single liquid core stage like the Long March 3A or Ariane 40, but ISRO wasn't exactly confident of clustering engines back then, according to the book "From fishing hamlet to red planet".

When conceived in the late '80s, GSLV design was essentially a compromise as the objective then was to develop a more powerful LV to launch India's communication satellites (they weighed typically 2 tonnes or less back then) using PSLV as the foundation. Hence they ended up with a quirky design having PSLV's solid core with liquid strapons. That the project got caught in a cryogenic quagmire, and subsequently missed the bus on meeting INSAT/GSAT launch requirements (as a result of the satellites gaining mass due to India's satellite TV revolution of the '90s) is another matter, and it was to repeat yet again in case of GSLV MkIII.
« Last Edit: 12/18/2018 08:30 am by vineethgk »

Offline K210

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Offline K210

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #43 on: 12/18/2018 10:49 am »
Changes since last flight of Mk-2 (F08 mission in March 2018):

- C15 replacing C12.5 upper stage (Upper stage propellent load increased from 12.8 tons to 15 tons, burn time increased some ~80 seconds)
- Imported C15 has flown once on F06 mission in December 2010 however this time will be the first time a indigenous C15 stage will fly
- Height of Mk-2 is now around 50m vs 48-49m before
- Maximum thrust of CE-7.5 increased to 113% (Was around 109% before)
« Last Edit: 12/18/2018 10:54 am by K210 »

Offline input~2

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #44 on: 12/18/2018 12:11 pm »
A3365/18 -  REF CHENNAI NOTAM A3322/18 GSLV-F11 ROCKET LAUNCH FM SHAR RANGE SRIHARIKOTA INDIA IS SKED ON 191030-191430 UTC. ATC MAY RERTE TFC DRG THIS PERIOD AS PER THE ROUTINGS GIVEN IN THE ABOVE NOTAM. LAUNCH WINDOW FOR THE REMAINING PERIOD FM 20 DEC 2018 TO 12 JAN 2019 SHALL BE KEPT ALIVE FOR RESCHEDULING OF LAUNCH IF REQUIRED. GND - UNL, 1030-1430, 19 DEC 10:30 2018 UNTIL 12 JAN 14:30 2019. CREATED: 17 DEC 09:48 2018

Offline input~2

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #45 on: 12/18/2018 12:29 pm »
 Saptak Mondal‏ @saptak__mondal  1010 minutes ago         ISRO to launch GSLV MK2 from Satish Dhawan Space Centre at 4:10 p.m. IST on 19th December 2018. It will carry GSAT 7A. It is a dedicated communication satellite for Indian Air Force


So T0= 10:40 UTC



Offline TheVarun

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #46 on: 12/18/2018 02:08 pm »
 Interesting that the video doesn't mention the enhanced cryogenic stage, when it refers to 'incorporating major improvements"!  Shouldn't that be the first thing that comes to mind?  It would be nice to know what challenges they encountered while improving the third stage- increasing the size of the thrust chamber, rotating the turbo pumps faster, enlarging the propellant tanks?  Anyway, all the best to ISRO, will be watched eagerly!

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #47 on: 12/18/2018 02:42 pm »
The countdown for the launch of GSLV-F11/GSAT-7A mission started today at 14:10 Hrs IST from Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota. The launch is scheduled at 16:10 Hrs IST on 19th December 2018
https://www.isro.gov.in/update/18-dec-2018/countdown-launch-of-gslv-f11-gsat-7a-mission-started-today-1410-hrs-ist-satish

https://twitter.com/isro/status/1074950401349337088?p=v


Offline worldtimedate

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Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #50 on: 12/18/2018 03:33 pm »
Propellant filling of liquid strap-ons (L40) begins
https://twitter.com/isro/status/1075053868361277440

Offline jcm

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #51 on: 12/18/2018 11:48 pm »
Changes since last flight of Mk-2 (F08 mission in March 2018):

- C15 replacing C12.5 upper stage (Upper stage propellent load increased from 12.8 tons to 15 tons, burn time increased some ~80 seconds)
- Imported C15 has flown once on F06 mission in December 2010 however this time will be the first time a indigenous C15 stage will fly
- Height of Mk-2 is now around 50m vs 48-49m before
- Maximum thrust of CE-7.5 increased to 113% (Was around 109% before)

Interesting. Do we know the serial number of the upper stage?  (e.g. GSLV-F08 used CUS-09)
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #52 on: 12/19/2018 03:31 am »
Propellant filling of liquid strap-ons has completed
https://twitter.com/isro/status/1075225776717488128

Now the C15 cryogenic upper stage remains to be fuelled.
« Last Edit: 12/19/2018 03:33 am by worldtimedate »

Offline sanjaykumar

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« Last Edit: 12/19/2018 06:01 am by sanjaykumar »

Offline vineethgk

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #54 on: 12/19/2018 06:45 am »
More images of rocket on pad from mission gallery

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #55 on: 12/19/2018 07:10 am »
GSLV-F11/GSAT-7A flight will the 69th launch from the Satish Dhawan Space Center. It will be the 13th flight of GSLV MK-II, 7th flight of GSLV MK-II with indigenous cryogenic upper stage. It will be the 7th launch of 2018 from SDSC. GSAT-7A is the 39th communication satellite of ISRO


Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #57 on: 12/19/2018 07:43 am »
Youtube Live Stream for the Launch

Offline catdlr

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #58 on: 12/19/2018 07:45 am »
Youtube Live Stream for the Launch



Not available in the US.
« Last Edit: 12/19/2018 07:45 am by catdlr »
Tony De La Rosa

Offline whiztech

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Re: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)
« Reply #59 on: 12/19/2018 08:41 am »
GSLV / GSAT-7A youtube stream

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