Author Topic: FAILURE: GSLV - GSAT-5P - December 25, 2010  (Read 137627 times)

Offline Salo

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« Last Edit: 04/22/2011 05:33 am by input~2 »

Offline Salo

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« Last Edit: 04/22/2011 05:32 am by input~2 »

Offline input~2

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #282 on: 04/21/2011 07:22 pm »
http://economictimes.indiatimes.com/news/politics/nation/isro-to-conduct-gslv-test-flight-in-2012-with-russian-cryogenic-stage-engine/articleshow/8044557.cms

Compare these 2 extracts:
"Of the seven engines procured from Russia, only two are left, said Ramakrishnan."
and "Only two of the seven GSLV launches have been total successes."

AFAIU, 6 MKI + 1 MKII = 7 launches
ISRO should have only one Russian engine left...

Offline Salo

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #283 on: 04/21/2011 10:05 pm »
Yes, it is.
There is only one 12KRB with KVD1A engine.

Offline Shams

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #284 on: 04/23/2011 07:42 am »
Weak Russian component downed Indian rocket: Ex-ISRO chief

The destruction of India's Geosynchronous Satellite Launch Vehicle (GSLV) in mid air in 2010 was due to an inherent weakness in a component in the Russian supplied cryogenic engine.

Read more.........

http://mangalorean.com/news.php?newstype=local&newsid=234229

shams
« Last Edit: 04/23/2011 07:43 am by Shams »

Offline kevin-rf

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If you're happy and you know it,
It's your med's!

Offline Salo

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #286 on: 07/13/2011 12:40 pm »
http://www.livemint.com/2011/07/08213841/K-Radhakrishnan--Flight-stage.html?h=B
Quote
So what about the seventh cryogenic engine from Russia? There were reports that both Isro and Russia disagreed on technical reasons for the failure of the most recent GSLV mission in December.

The last two engines (the sixth and seventh) have greater thrust than previous engines. They was supplied in 2004 and 2005, and stored in specified conditions. So the reason for the failure (in December) was the inadvertent snapping of the connectors, well before time [connectors are critical for controlling the vehicle]. This happened because the shroud gave away (the shroud is a casing that separates the liquid and solid stages of the launch cover). Itís a cover that sits on (the) bottom of the cryogenic stage. Now, why did the shroud go? Was it the 4m heat shield? We then realized that it was the inherent vulnerability of the shroud. The shroud was at the bottom of the cryogenic stage. There were 10 connectors in two stages, and both gave way. Initially, the Russians said it was our 4m shield that was responsible. We put both our analyses, and finally the Russians also came around. We then decided that the seventh engine has to be inspected, too. We did it and found that they werenít made in the dimensions specified to in the document. There are lots of shortcomings, and the Russians admitted it. Now, the point is that this has to be corrected before it can be used for launch and would require a detailed inspection by them.

Offline chota

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #287 on: 07/19/2013 01:10 pm »
Resurrecting an old thread

http://www.indiastrategic.in/topstories986.htm

"The fault was there from the first GSLV that flew with the Russian cryogenic engine in 2001. The weakness in the shroud caught ISRO on December 25 last year,"

"All GSLV's that flew with Russian cryogenic engine have encountered problems carrying a payload of over 2,000 kg"

"In 2007, one of the connecters of the GSLV rocket got snapped and the rocket's performance was considered as below par. The rocket had carried 2,130 kg INSAT-4CR satellite"


Offline K210

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Re: FAILURE: GSLV - GSAT-5P - December 25, 2010
« Reply #288 on: 08/18/2013 06:57 am »
Resurrecting an old thread

http://www.indiastrategic.in/topstories986.htm

"The fault was there from the first GSLV that flew with the Russian cryogenic engine in 2001. The weakness in the shroud caught ISRO on December 25 last year,"

"All GSLV's that flew with Russian cryogenic engine have encountered problems carrying a payload of over 2,000 kg"

"In 2007, one of the connecters of the GSLV rocket got snapped and the rocket's performance was considered as below par. The rocket had carried 2,130 kg INSAT-4CR satellite"



The latest GSLV has a onboard camera to monitor the shroud.

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