Author Topic: GSAT-7A - GSLV F11 - December 19, 2018 (10:40 UTC)  (Read 20284 times)

Offline TheVarun

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #20 on: 12/11/2018 03:18 pm »
https://www.isro.gov.in/gslv-f11-gsat-7a-mission

ISRO has displayed information about the launch, definitely scheduled for December 19. Nice pics!

Offline ZachS09

Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #21 on: 12/11/2018 03:46 pm »
Press kit for GSLV F11 carrying GSat 7A.

Doesn't say how much thrust each stage produces, so I can't tell if the new booster engines are being used.
Because the Falcon Heavy Test Flight was successful, it has inspired thousands of people to consider changing the future of space travel.

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #22 on: 12/11/2018 10:25 pm »
ISRO publishes GSLV-F11 / GSAT-7A Mission Gallery
« Last Edit: 12/11/2018 10:28 pm by worldtimedate »

Offline PonRam

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #23 on: 12/11/2018 10:50 pm »
Press kit for GSLV F11 carrying GSat 7A.

Doesn't say how much thrust each stage produces, so I can't tell if the new booster engines are being used.

The ISRO mission page says "The four liquid strap-ons and a solid rocket motor at the core form the first stage. The second stage is equipped with high thrust engine using liquid fuel."

HT Vikas is used only for the second stage not in the strap-ons.

Offline K210

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #24 on: 12/12/2018 04:07 am »
Looks like C15 will be replacing the C12.5 as the upper stage for the first time. According to launch kit they seem to be aiming for 40,000 km apogee against the normal 35,950 km. That would explain the 2.25 ton payload mass as they seem to be wanting to put any payload gains into a achieving a higher initial orbit instead.


Offline K210

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #25 on: 12/12/2018 07:17 am »
Summary on GSAT-7A:

Mass: 2250kg
Bus: I-2K (2000kg class GEO satellite)
Power generation capability: 3.3 kW
Mission Life: 8 years
Payload: Ku-band transponders
User: Strategic :-X

Source: https://www.isro.gov.in/gslv-f11-gsat-7a-mission

« Last Edit: 12/12/2018 07:18 am by K210 »

Offline K210

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #26 on: 12/12/2018 07:20 am »
Fully assembled F11 inside VAB:


Offline starbase

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Re: GSAT-7A - GSLV F11 - SLP - NET December 19th 2018
« Reply #27 on: 12/12/2018 11:23 am »
GSLV-F11 now firmly set for Dec. 19.

Source: https://twitter.com/isro/status/1072660468857229313

Offline input~2

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #28 on: 12/12/2018 12:17 pm »
A3305/18 - GSLV- F11 ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE
PLACE AS PER FLW DETAILS. THE LAUNCH WILL BE ON ANY ONE OF THE DAY
DRG THIS PERIOD.  ACTUAL DATE OF LAUNCH WILL BE INTIMATED 24HR IN
ADVANCE THROUGH A SEPERATE NOTAM.       

LAUNCH PAD COORD:  1343.2N   08013.8E

NO FLT IS PERMITTED OVER THE DNG ZONE.
A. DNG ZONE-1 IS A CIRCLE OF 10NM AROUND THE LAUNCHER
B. DNG ZONE-2 IS AN AREA BOUNDED  BY FLW COORD:
I) 1205N 08450 E
II) 1250N 08500E
III) 1220N 08620E
IV) 1135N 08610E

C. DNG ZONE-3 IS AN AREA BOUNDED  BY FLW COORD:
I)  1055N 08835E
II) 1140N 08845E
III) 1105N 09030E
IV) 1025N 09020E

D. DNG ZONE-4 IS AN AREA BOUNDED  BY FLW COORD:
I)   0810N 09510E
II)  0950N 09510E
III) 0950N 09605E
IV) 0810N 09605E
   
ROUTES AFFECTED IN CHENNAI FIR:
W20, Q11, V4, V9, Q23, Q24, P762, N877, N571, P761 AND A465

CLOSURE/ALTERNATE ROUTINGS:

1. W20 NOT AVBL BTN MMV VOR AND KAMGU
   ALTN RTE: MMV VOR-MM610-RAMDO- KAMGU (BIDIRECTIONAL)
2. Q24 NOT AVBL BTN MMV VOR AND KAMGU
   ALTN RTE: MMV VOR-MM610-RAMDO-KAMGU
3. A465 NOT AVBL BTN MMV VOR AND GURAS
   ALTN RTE: (WEST BOUND) GURAS- KOLCA- MMV VOR
             (EAST BOUND) MMV VOR - KOLCA - GURAS
4. N571 NOT AVBL BTN IDASO AND BIKEN

  ALTN RTE: IDASO - PT B (11 37N 084 35E) -BIKEN (BIDIRECTIONAL)
5. P761 NOT AVBL BTN IDASO AND DUMAR
   ALTN RTE: IDASO PT A (131906N 0851936E)-DUMAR
PART 1 OF 2 PARTS. BTN 1030-1430 ON LAUNCH DAY, 19 DEC 10:30 2018 UNTIL 12 JAN
14:30 2019. CREATED: 11 DEC 11:51 2018
« Last Edit: 12/12/2018 12:30 pm by input~2 »

Offline Star One

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #29 on: 12/12/2018 12:21 pm »
Summary on GSAT-7A:

Mass: 2250kg
Bus: I-2K (2000kg class GEO satellite)
Power generation capability: 3.3 kW
Mission Life: 8 years
Payload: Ku-band transponders
User: Strategic :-X

Source: https://www.isro.gov.in/gslv-f11-gsat-7a-mission

8 years mission life seems rather low?

Offline K210

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #30 on: 12/13/2018 04:15 am »
Summary on GSAT-7A:

Mass: 2250kg
Bus: I-2K (2000kg class GEO satellite)
Power generation capability: 3.3 kW
Mission Life: 8 years
Payload: Ku-band transponders
User: Strategic :-X

Source: https://www.isro.gov.in/gslv-f11-gsat-7a-mission

8 years mission life seems rather low?

My guess is they reduced propellent loading in order to keep satellite weight <2.5 ton

Offline worldtimedate

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Offline Star One

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #32 on: 12/14/2018 03:14 pm »
Summary on GSAT-7A:

Mass: 2250kg
Bus: I-2K (2000kg class GEO satellite)
Power generation capability: 3.3 kW
Mission Life: 8 years
Payload: Ku-band transponders
User: Strategic :-X

Source: https://www.isro.gov.in/gslv-f11-gsat-7a-mission

8 years mission life seems rather low?

My guess is they reduced propellent loading in order to keep satellite weight <2.5 ton

In that case itís unfortunate that launcher capacity has restricted mission life.

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #33 on: 12/17/2018 12:15 am »
ISRO will wrap up this year's launch mission with the launch on December 19, the GSAT-7A satellite exclusively to be used by the IAF

Quote
Although all Indian communication satellites offer capacity to the armed forces, GSAT-7A will be the first one built primarily for the IAF to qualitatively unify its assets and improve combined, common intelligence during operations. With integrated action being a buzzword it will also support aerial activities of the Army and the Navy where required.

"About 70% of it would be for the Air Force and the rest for the needs of the Army," said a source in Delhi. The ground force's Army Aviation Corps operates many helicopters, uses UAVs and will acquire fixed wing aircraft in future - all for surveillance and rescue missions.

Multiple sources said the satellite using Ku band will enable superior real time aircraft-to-aircraft communication; and between planes that are in flight and their commanders on the ground. It would enhance by many times the coverage now provided by ground communication systems such as radars and stations of the Army. Out-of-sight and remote areas where ground infrastructure and signals are difficult would get into the critical information loop.

Source : ISRO's GSAT-7A to add more heft to Air Force

Offline K210

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Offline vineethgk

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #35 on: 12/18/2018 03:30 am »
Summary on GSAT-7A:

Mass: 2250kg
Bus: I-2K (2000kg class GEO satellite)
Power generation capability: 3.3 kW
Mission Life: 8 years
Payload: Ku-band transponders
User: Strategic :-X

Source: https://www.isro.gov.in/gslv-f11-gsat-7a-mission

8 years mission life seems rather low?

My guess is they reduced propellent loading in order to keep satellite weight <2.5 ton

In that case itís unfortunate that launcher capacity has restricted mission life.
It doesn't seem to make much sense since they are using an enhanced upper stage (CUS-15) this time with a greater propellant loading (15 tonnes vs the usual 12 tonnes).

Perhaps they kept the payload mass lower to test out the new stage, or maybe they are attempting to target a higher apogee this time (the launch brochure puts apogee target at an unusual 33,190 - 40,600 km).

Perhaps we will get better clarity on this during the launch commentary.
« Last Edit: 12/18/2018 03:31 am by vineethgk »

Offline vineethgk

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #36 on: 12/18/2018 03:44 am »
Rather good prelaunch photos in mission gallery this time, including a panoramic one with an early morning mist in the background.

Now, lets hope they don't screw up with launch images.

Offline K210

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #37 on: 12/18/2018 03:58 am »
Launch brochure is out. Screenshots+PDF attached.

Source: https://www.isro.gov.in/gsat-f11-gsat-7a-mission/gslv-f11-gsat-7a-brochure

 

Offline vineethgk

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #38 on: 12/18/2018 04:03 am »
It is also worth noting that if this launch goes ahead as planned, it would be the first time ISRO is attempting two GSLV MkII flights in a calendar year, and the second time it is doing two MkI/MkII flights after the 'infamous' year of 2010 (when both D3 and F06 went kaput, dealing a blow to ISRO's morale that took years to recover).
« Last Edit: 12/18/2018 04:06 am by vineethgk »

Offline worldtimedate

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Re: GSAT-7A - GSLV F11 - SLP - December 19th 2018
« Reply #39 on: 12/18/2018 06:39 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.

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