Author Topic: GSLV MkII F14 - INSAT-3DS - SLP - 17 February 2024 (12:05 UTC)  (Read 30776 times)

Offline K210

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New white GS3 stage
« Last Edit: 02/14/2024 06:07 pm by K210 »

Offline Angry_cat

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New white GS3 stage

Does it have any practical benefit or is it purely for cosmetic purposes?

Online GewoonLukas_

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New white GS3 stage

Does it have any practical benefit or is it purely for cosmetic purposes?

It has better thermal properties due to the white color, and it is more environmentally friendly to produce.
Lukas C. H. • Hobbyist Mission Patch Artist 🎨 • May the force be with you my friend, Ad Astra Per Aspera ✨️

Offline Steven Pietrobon

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It has better thermal properties due to the white color, and it is more environmentally friendly to produce.

Source?
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online GewoonLukas_

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It has better thermal properties due to the white color, and it is more environmentally friendly to produce.

Source?

From when the LVM3 rocket also switched from gray/black insulation to white: https://www.wionews.com/india-news/isros-c25-cryogenic-stage-now-sports-white-ditches-black-whats-the-science-behind-it-575318

Quote
[...]

For the first five launches of the LVM3 rocket, ISRO had been using a grey/black insulation material for the C25 stage and now that material has been replaced with a white coloured one.

"The earlier insulation material was based on Hydrochlorofluorocarbon (HCFC) and owing to environmental concerns, we have switched to greener alternatives based on chemicals such as Hydrofluoro-Olefine," said Nair.

HCFCs are globally regarded as unsafe as they contain chlorine and have the potential to deplete the ozone layer. Owing to this, there are certain manufacturing caps on this material and ISRO is avoiding its use.

Regarding the grey/black colour being replaced with white, he added that the earlier anti-static coating (meant to prevent a build-up of static electricity) has been replaced with a white one. He reasoned that this was owing to solar absorptivity, as dark colours like black attract a lot of heat and affect the temperature of the cryogenic fuels.

[...]
Lukas C. H. • Hobbyist Mission Patch Artist 🎨 • May the force be with you my friend, Ad Astra Per Aspera ✨️

Online GewoonLukas_

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Now 12:05 UTC:

Quote
GSLV-F14/INSAT-3DS Mission:

The launch is now scheduled at 17:35 Hrs. IST.

It can be watched LIVE from 17:00 Hrs. IST on
Website https://isro.gov.in
Facebook https://facebook.com/ISRO/
YouTube https://youtube.com/watch?v=jynmNenneFk
DD National TV Channel

@DDNational @moesgoi #INSAT3DS

https://twitter.com/isro/status/1758057900789109147
Lukas C. H. • Hobbyist Mission Patch Artist 🎨 • May the force be with you my friend, Ad Astra Per Aspera ✨️

Offline Galactic Penguin SST

https://twitter.com/isro/status/1758412843131797625

Quote
GSLV-F14/INSAT-3DS Mission:

27.5 hours countdown leading to the launch on February 17, 2024, at 17:35 Hrs. IST has commenced.
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery.

Online Satori

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Does anyone know the orbital position that will be occupied by the satellite?

Offline Galactic Penguin SST

Does anyone know the orbital position that will be occupied by the satellite?

https://space.oscar.wmo.int/satellites/view/insat_3ds says 74° E.
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Offline K210

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Some higher-res photos of the launcher and payload

Offline K210

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Planned mission profile

Offline K210

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Notable points:

- Planned burn duration of GS3 in this mission is 3 seconds longer at 813 seconds compared to 810 seconds
  in the previous launch (GSLV-F12)
- Vikas engines in L40s are the standard version not the "High Thrust" variant
- New white insulation used on GS3 stage for first time
« Last Edit: 02/17/2024 02:11 am by K210 »

Offline Galactic Penguin SST

Launch director is go for launch.
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery.

Offline eeergo

Lots of people in the live audience!
« Last Edit: 02/17/2024 11:04 am by eeergo »
-DaviD-

Offline eeergo

LIFTOFF and performance "naarmal"  ;)
-DaviD-

Offline eeergo

Slight petering of the side boosters, but looked ok in the performance graph. First and second stages burned alright and separated, along with the fairing being jettisoned. Now into coasting prior to third stage ignition.
-DaviD-

Offline eeergo

Cryogenic 3rd stage performance normal (remember this caused lots of grief to GLSV Mk II in years past, so worth celebrating). In other news, Sri Lanka has been rediscovered (by ISRO)!  ;D
-DaviD-

Offline eeergo

Instruments in the (meteorological) INSAT-3DS:
-DaviD-

Offline eeergo

9.4 km/s, close to cutoff into GTO.
-DaviD-

Offline eeergo

Cutoff, S/C separation and declaration of GSLV F14 success!
-DaviD-

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