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GSLV-F06 Mission Failure

Posted by: sanman - Sat Dec 25, 2010 10:44 am
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GSLV-F06 Mission Failure 
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Space Walker
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Post GSLV-F06 Mission Failure   Posted on: Sat Dec 25, 2010 10:44 am
Vehicle has just exploded - looks like altitude=13km @ ~50secs into the flight.


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Post Re: GSLV-F06 Mission Failure   Posted on: Sun Dec 26, 2010 10:02 am
Ouch!

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Post Re: GSLV-F06 Mission Failure   Posted on: Sun Dec 26, 2010 8:20 pm
Well, in their defence, it is the time of the year for fireworks ;-). Still, not a good day for the ISRO...

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Post Re: GSLV-F06 Mission Failure   Posted on: Mon Dec 27, 2010 6:32 pm
Guess they didn't get that leak fixed after all.

Just kidding, bummer about the mission. This is going to put them back a few steps...


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Post Re: GSLV-F06 Mission Failure   Posted on: Tue Dec 28, 2010 4:58 pm
This seems to be the sequence of events leading to failure, imho:

1) aerodynamic stresses/vibrations build up as rocket traverses Max-Q
2) stresses/vibrations snap control cables
3) loss of control cable connectivity means engines stop responding to guidance correction commands
4) rocket loses correct orientation and angle of attack relative to slipstream, causing buildup of shear forces
5) rocket suffers structural breakup

ISRO seems to have made modifications to the GSLV for this flight, lengthening the rocket to carry extra fuel, and enlarging the faring to accommodate greater payload weight. The GSAT-5P communications satellite was the heaviest payload that ISRO has ever tried to launch.

Either the modifications to the rocket resulted in new vibration modes that ISRO failed to account for, or else ground crew were simply careless during pre-launch checks, failing to ensure that all control cables were adequately secured.


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Post Re: GSLV-F06 Mission Failure   Posted on: Fri Dec 31, 2010 2:33 am
Let's look more closely at this:

http://netindian.in/news/2010/12/29/000 ... ro-sources

Quote:
"The take-off was smooth and the flight was normal till 47 seconds. But trouble arose in the next three seconds, when 10 connectors located between the second and third stage (cryogenic stage) got separated, leading to the vehicle losing controllability," the sources said.



So that sounds like something could have happened with the cryogenic upper stage (CUS), that could have caused a major problem to the connectors below it. Could a cryo-propellant tank have ruptured/leaked due to aerodynamic stresses, and then disabled those connectors/cables?


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Post Re: GSLV-F06 Mission Failure   Posted on: Tue Apr 19, 2011 11:59 pm
Flawed Shround Design Found to Cause GSLV Failure:

http://timesofindia.indiatimes.com/arti ... 032380.cms


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