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#100 by input~2 on 19 Aug, 2013 10:52
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#101 by input~2 on 19 Aug, 2013 10:55
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Scrub confirmed by ISRO chairman
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#102 by Galactic Penguin SST on 19 Aug, 2013 11:09
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Apparently launch will be delayed >1 week as the rocket will be rolled back and de-stacked.
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#103 by input~2 on 19 Aug, 2013 12:27
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ISRO press releaseAugust 19, 2013 GSLV-D5 Launch Called-Off The Launch of the GSLV-D5 scheduled for 1650 hrs today (August 19, 2013) is called off, as a leak is observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle just two hours before the scheduled lift-off.
The propellants are being drained from the Cryogenic Stage, Liquid Second Stage and the four liquid Strap-ons of GSLV-D5. The vehicle will be moved back to the Vehicle Assembly Building for further actions.
The revised launch date will be announced after a detailed assessment. -
#104 by xm11 on 19 Aug, 2013 18:57
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if it delay to one week
will be two launch one of gsat 14 and gsat 7 from arianespace
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#105 by isro-watch on 20 Aug, 2013 00:51
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Something really unusual in GSLV...at least, I have never seen !!!
http://www.ndtv.com/video/player/news/india-s-200-crore-space-mission-delayed-after-leak-in-rocket/287475
Look closely at 21 seconds to 24 seconds in the video...You see a liquid gushing out !!!
Not sure if this has anything to do with the leak -
#106 by ozspace on 20 Aug, 2013 01:47
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Something really unusual in GSLV...at least, I have never seen !!!
http://www.ndtv.com/video/player/news/india-s-200-crore-space-mission-delayed-after-leak-in-rocket/287475
Look closely at 21 seconds to 24 seconds in the video...You see a liquid gushing out !!!
Not sure if this has anything to do with the leak
I believe you are seeing water sprayed onto the pad from the tower, possibly for acoustic, fire or thermal control to minimise damage. -
#107 by isro-watch on 20 Aug, 2013 01:55
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I believe it will take them quite long to fix this problem. The last time when there was an issue with PS2 stage in PSLV-C10, they took many months...
This time, the problem seems more serious. Clearing out propellants, bringing the rocket back to the pad, dismantling and re-assembly !!! -
#108 by AJA on 20 Aug, 2013 10:15
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Something really unusual in GSLV...at least, I have never seen !!!
http://www.ndtv.com/video/player/news/india-s-200-crore-space-mission-delayed-after-leak-in-rocket/287475
Look closely at 21 seconds to 24 seconds in the video...You see a liquid gushing out !!!
Not sure if this has anything to do with the leak
I believe you are seeing water sprayed onto the pad from the tower, possibly for acoustic, fire or thermal control to minimise damage.
Look at the top right. The jet's seen at a time of L-1:14:20 (and the clock isn't counting) - so this was after they stopped the countdown. (At 00:32 in the news report, there's a shot from earlier in the countdown, only showing what I assume is condensation around some cool plumbing in the tower).
<speculation follows. Begs pardons
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I don't know what the detox process is for hypergols, but given that the jet was aimed at the bottom of the second stage (between the bottom of the engine shroud and the interstage), I'm assuming that the epicentre of the leak was somewhere there, and the water was used to possibly dissolve the toxic UH25 and wash it down - rather than it volatilise, and have vapours hang around the pad.
Also, going through this thread, I found that the second stage propellant loading was completed (latest) by 0919 hrs IST on launch day. (L-07:31:00). From the ISRO Chairman's statement, we know they detected the leak at L-2:00:00. Interestingly, cryogenic propellant loading (LOX first) commenced (no later than) 1352 hours (L-2:58:00).
So that's a gap of ~5.5 hours between completion of 2nd stage prop loading to first leak detection; or, a gap of 58 minutes between cryo loading and the same[1]. (Another 46 min before they stopped countdown) - presumably to rule out instrumentation fault, and to confirm a leak via appreciable change in tank pressures/levels (Media reports of "smoke" were post-hoc).
[1] After reading this in the brochure:QuoteModified design of the Fuel Booster Turbo Pump (FBTP), taking care of the expansion and contraction of the bearings and casing at cryogenic temperatures
- I was tempted to blame similar 'unexpected' contraction for the 2nd stage counterparts, for the leak, but the cold stuff is whole stage apart. So, I'm leaning toward some contamination/corrosion/manufacturing defect as a cause. -
#109 by chota on 20 Aug, 2013 12:49
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ISRO may use a standby engine to launch GSLV after further tests
http://economictimes.indiatimes.com/news/politics-and-nation/isro-may-use-standby-engine-to-launch-gslv/articleshow/21935355.cms -
#110 by chota on 20 Aug, 2013 13:08
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Isro scientists have remotely drained the fuels from the second stage and the indigenous cryogenic engine
GSLV to be moved to VAB on Sunday or Monday to ascertain the damage and further investigation
http://timesofindia.indiatimes.com/india/GSLV-D5-safe-after-fuel-is-drained-to-be-moved-out-of-launch-pad-on-August-25/articleshow/21934982.cms -
#111 by akaash on 23 Aug, 2013 05:47
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GSLV relaunch will take several months. Even if the defect is found to be a minor one, it would take at least two months. If it’s a major problem, it might take longer,
http://newindianexpress.com/states/kerala/GSLV-relaunch-will-take-several-months/2013/08/23/article1747479.ece -
#112 by input~2 on 27 Aug, 2013 11:17
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#113 by Chris Bergin on 27 Aug, 2013 13:33
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Wow, months.
But as with all rockets, that's good news when they find the issue on the ground and not half way uphill! -
#114 by antriksh on 27 Aug, 2013 16:12
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What stopped India's rocket launch? 750 kg of leaking fuel
NDTV has now learnt that scientists discovered that 750 kilograms of highly inflammable and explosive fuel had leaked from the engine.
"There is no generic problem with the rocket," Mr Radhakrishnan told NDTV. The launch will be attempted again in December.
http://www.ndtv.com/article/india/what-stopped-india-s-rocket-launch-750-kg-of-leaking-fuel-411152?pfrom=home-lateststories -
#115 by robertross on 27 Aug, 2013 22:59
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Wow, months.
But as with all rockets, that's good news when they find the issue on the ground and not half way uphill!
How true. -
#116 by sanman on 28 Aug, 2013 03:30
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ISRO to assemble another engine for aborted GSLV:
http://zeenews.india.com/news/space/isro-to-assemble-another-engine-for-aborted-gslv_872172.html
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#117 by chota on 28 Aug, 2013 12:34
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"Next flight in December for which first and third stages are preserved. Second stage is being prepared"
"ISRO used an old tank delivered 4 years ago in the second stage which might be prone to cracks"
http://www.thehindu.com/sci-tech/science/gslv-flight-with-indigenous-cryogenic-engine-only-in-dec-isro/article5068115.ece -
#118 by Star One on 28 Aug, 2013 12:49
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"Next flight in December for which first and third stages are preserved. Second stage is being prepared"
"ISRO used an old tank delivered 4 years ago in the second stage which might be prone to cracks"
http://www.thehindu.com/sci-tech/science/gslv-flight-with-indigenous-cryogenic-engine-only-in-dec-isro/article5068115.ece
Seems a little odd to be using a tank that had been in storage for four years on your flagship launcher on arguably its most important launch? -
#119 by seshagirib on 28 Aug, 2013 14:55
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Time to move back this thread to Indian launchers section.....we are not going to see a launch attempt any time soon.
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