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Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

m.timesofindia.com

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Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#41

Post by legolas2412 »

alphadog_78 wrote: post #14

Congratulations ISRO.. Good step in right direction. If we compare this to current SpaceX Falcon 9 (not Falcon Heavy ) http://www.spacex.com/falcon9 Falcon 9 can deliver 8300 Kg to GTO and 22,800kg to LEO. GSLV MK III delivers 4000 Kg to GTO and 8000KG to LEO ( http://www.isro.gov.in/launchers/gslv-mk-iii ) Mr. Musk will be delivering hell lot of stuff to space with his reusable rockets. SO, he will be very cost comp…

Falcon 9 FT beats Mk III hands down.

But ISRO reached 2 Tons for GSLV just last year, This is rated at 4 Tons, and future improvements to 8 to 10 tons is on cards within 1-2 years. Even a proposal for 15 Tons by 2020.

http://www.thehindu.com/news/national/Mega-launchers-for-ISR... (https://en.wikipedia.org/wiki/SCE-200)

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#42

Post by InclinedPlane »

bewaretheirs wrote: post #11
v33ra wrote: post #7

Earlier quoted context omitted.

and the one that has potential to take an Indian to the moon.

With capacity of 10 tons to LEO, 4 tons to GTO, it's somewhere between the Titan II (used for Gemini) and Titan III. Would have to be a pretty lean moon mission.

Only for a direct ascent architecture. There are lots of Earth orbit assembly missions that would be possible and not terribly expensive to pull off (at least for a lunar flyby style mission).

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#44

Post by dingo_bat »

jgrahamc wrote: post #5

Some really nice photos of this on the ISRO site: http://www.isro.gov.in/gslv-mk-iii-d1-gsat-19-mission/gslv-m... Also the launch video is amazing. The moment the engines ignite the whole thing is moving most likely because those are solid rocket boosters and there's no throttle up time: https://www.youtube.com/watch?v=ae6LVG0j1Pg

I don't know why the video quality is so shitty. My cellphone takes better quality footage than this. I would assume they could have used a tiny portion of their multi-million $ budget for some decent cameras.

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#45

Post by dasmoth »

swatkat wrote: post #33
jgrahamc wrote: post #5

Some really nice photos of this on the ISRO site: http://www.isro.gov.in/gslv-mk-iii-d1-gsat-19-mission/gslv-m... Also the launch video is amazing. The moment the engines ignite the whole thing is moving most likely because those are solid rocket boosters and there's no throttle up time: https://www.youtube.com/watch?v=ae6LVG0j1Pg

Yes. GSLV Mk III first stage is made up of two S200 solid boosters, with 200 ton propellant in each. S200 is the third largest solid boosters in the world (after Shuttle SRB, and P230 of Ariane-5).

If the figures at http://www.globalsecurity.org/space/systems/t4-config-5.htm are correct, the Titan IVB "SRM upgrade" boosters were bigger too (over 300 tonnes of propellant)

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#46

Post by slackingoff2017 »

kinkrtyavimoodh wrote: post #37
ceejayoz wrote: post #35

Earlier quoted context omitted.

> You loose something when you have youngsters with a bunch of Dell monitors like spaceX. What, exactly, do you lose?

Vaguely worded nostalgia

zing

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#47

Post by dis-sys »

Did I miss something here?

The rocket is nicknamed "fatboy" and it is indeed fat. I was having the impression that india finally made a rocket comparable to Falcon Heavy, Ariane 5, Delta IV Heavy and CZ-5. When I checked its specs, well, 8,000kg to LEO and 4,000kg to GTO, seriously? Not trying to discount its symbolic importance to india, but technically, why its so fat when the payload capacity is so limited?

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#48

Post by baq »

InclinedPlane wrote: post #40
baq wrote: post #25

Earlier quoted context omitted.

good analysis, but i think you're missing the fact that the upper stage has a hydrolox engine, which destroys the falcon 9 stage 2 in terms of Isp (wikipedia gives 443 s). i wouldn't be surprised if it can carry more to geo-1500 than the f9. edit: well the same wikipedia cites 4000kg to GTO so my guess is wrong.

Isp is only one factor. The GSLV Mk. 3's upper stage is LOX/LH2 but it's also fairly small. The Falcon 9's upper stage is 4 tonnes empty 107.5 tonnes fueled, with an Isp of 348s. The GSLV Mk. 3's upper stage has an Isp of 443s (good) a dry mass of 5 tonnes (not as good) and a wet mass of 33 tonnes. The mass fraction on the F9 upper stage utterly dominates the GSLV's upper stage Isp. Let's look at GTO payloads and upp…

thanks for the writeup!

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#49

Post by crazystar »

jpeg_hero wrote: post #27
jgrahamc wrote: post #5

Some really nice photos of this on the ISRO site: http://www.isro.gov.in/gslv-mk-iii-d1-gsat-19-mission/gslv-m... Also the launch video is amazing. The moment the engines ignite the whole thing is moving most likely because those are solid rocket boosters and there's no throttle up time: https://www.youtube.com/watch?v=ae6LVG0j1Pg

Props to them for having old school, Apollo-style consoles in the mission control room. You loose something when you have youngsters with a bunch of Dell monitors like spaceX. I've seen twitch on the second monitor in spacex control room.

Yeah, imagine what they could do if they had dell monitors. I bet spacex wouldn't stand a chance.

Re: Isro’s new GSLV Mk III rocket places GSAT-19 communication satellite in orbit

#50

Post by happy-go-lucky »

greglindahl wrote: post #21
happy-go-lucky wrote: post #15

Earlier quoted context omitted.

> http://www.spacex.com/falcon9 According to the technical overview, Falcon 9 can also deliver 4020 kg to Mars :)

To put that into perspective, India's last Mars satellite https://en.wikipedia.org/wiki/Mars_Orbiter_Mission weighed 1.3 metric tons, and was launched on PSLV-XL.

Thanks for the wiki. ISRO has been consistently performing well. They can be a role model for other government agencies in India.
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