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#100
by
Salo
on 25 Dec, 2010 10:43
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#101
by
Salo
on 25 Dec, 2010 10:48
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May be ultraboundary angle of attack?
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#102
by
ugordan
on 25 Dec, 2010 10:54
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A strap-on booster is ejected right after the explosion:
"Explosion" is a harsh word. This was clearly aerodynamic breakup, not a catastrophic propulsion failure.
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#103
by
isro-watch
on 25 Dec, 2010 10:55
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See the images above...especially the second image...I see a disintegration there
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#104
by
MikeMi.
on 25 Dec, 2010 10:57
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Conference in 3 minutes. Can someone confirm?
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#105
by
isro-watch
on 25 Dec, 2010 10:59
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Is it possible to recover the satellite...? considering that the speed was not much at this failure and failring would not have come out...;-)
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#106
by
ugordan
on 25 Dec, 2010 11:02
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Is it possible to recover the satellite...? considering that the speed was not much at this failure
Let's put it this way - the breakup happened around the time of greatest aerodynamic forces. They were enough to rip the upper stage and fairing and then the whole vehicle apart.
They can recover the satellite... pieces. Satellite pieces.
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#107
by
Satori
on 25 Dec, 2010 11:03
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Is it possible to recover the satellite...? considering that the speed was not much at this failure and failring would not have come out...;-)
No...
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#108
by
wbhh
on 25 Dec, 2010 11:07
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Is it possible to recover the satellite...? considering that the speed was not much at this failure and failring would not have come out...;-)
Impossible, from 5000 meters droping to sea almost equal droping to cement ground.
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#109
by
Satori
on 25 Dec, 2010 11:16
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This being a problem on the solid propulsion system can mean problems for the PSLV...
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#110
by
johnxx9
on 25 Dec, 2010 11:22
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This being a problem on the solid propulsion system can mean problems for the PSLV...
IIRC, the S139 stage has never failed before.
Maybe under-performance by one of the LSBs could have caused the vehicle to veer off trajectory resulting in AoA going out of bounds leading to the break-up of the vehicle ??
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#111
by
ugordan
on 25 Dec, 2010 11:24
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This being a problem on the solid propulsion system can mean problems for the PSLV...
Is this speculation or official word that the core is to blame?
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#112
by
isro-watch
on 25 Dec, 2010 11:26
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This being a problem on the solid propulsion system can mean problems for the PSLV...
IIRC, the S139 stage has never failed before.
Maybe under-performance by one of the LSBs could have caused the vehicle to veer off trajectory resulting in AoA going out of bounds leading to the break-up of the vehicle ??
The vehicle didn't look to have veered off trajectory before the break-up
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#113
by
johnxx9
on 25 Dec, 2010 11:26
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This being a problem on the solid propulsion system can mean problems for the PSLV...
Is this speculation or official word that the core is to blame?
No official word on this yet.
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#114
by
ugordan
on 25 Dec, 2010 11:28
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The vehicle didn't look to have veered off trajectory before the break-up
It most certainly started to pitch "up" at about T+52 seconds as seen in video, followed by breakup about 2 seconds later.
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#115
by
Satori
on 25 Dec, 2010 11:30
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This being a problem on the solid propulsion system can mean problems for the PSLV...
Is this speculation or official word that the core is to blame?
I'm not talking about the core. I'm talking about the solid propulsion system in general. ISRO was so worried about the third stage that the problems stroke where ISRO had 100% success. I think that now ISRO will look very carefully to the solid propulsion system of the PSLV on FLP and this can mean a delay for the next launch.
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#116
by
ugordan
on 25 Dec, 2010 11:31
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Maybe under-performance by one of the LSBs could have caused the vehicle to veer off trajectory resulting in AoA going out of bounds leading to the break-up of the vehicle ??
Not necessarily. You can usually put money on electrical shorts causing gimbal hard-overs as cause for these unexplained vehicle maneuvers, there's been more than enough such occasions historically. In fact, that's what I'd bet on at this moment.
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#117
by
Salo
on 25 Dec, 2010 11:51
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#118
by
Salo
on 25 Dec, 2010 12:00
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This being a problem on the solid propulsion system can mean problems for the PSLV...
IIRC, the S139 stage has never failed before.
Maybe under-performance by one of the LSBs could have caused the vehicle to veer off trajectory resulting in AoA going out of bounds leading to the break-up of the vehicle ??
The S139 stage has been working till the end.
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#119
by
johnxx9
on 25 Dec, 2010 12:05
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Extract from ISRO press conference......
ISRO confirms Altitude Error in Press Conference , Large Altitude error developed.
Control Command Signal from onboard computer failed to reach first stage after 47 second
Self Destruct command issued.
ISRO chairman noted what caused this control command failure needs further analysis.
