12-11-2009, 09:19 AM
[quote name='Arun_S' date='10 December 2009 - 01:37 PM' timestamp='1260473359' post='102878']
Sorry for late reply, I was unable to access the forum because of all kinds of connectivity problem.
Trouble shooting flight failure on a missile that is released to user service is more troublesome because it is not as intensely instrumented. Analysis from limited data often lead to many failure modes and in the eventual parato analysis some of have lower probability thus no deeper scrutiny, specially if it is a multi variable problem. So it is possible that it is not caught in first fix.
If it was only INS it will be easy to identify and fix, but it is also very very unlikely that it was only an INS problem, more likely to be a compound problem. Both the failed tests were near Max-Q portion of flight trajectory, and that generally points to control system failure. And Control system spans many subsystems ranging from control laws (software), sensors and actuators.
[/quote]
1. But still, that the INS could underperform is worrying. Does that not have implications for A-III, Shourya, unless INS underperformance was due to extreme abnormal conditions caused by other circumstances. Saraswat's remarks seem to hint at quality control with some mechanical interfaces.
2. Regarding Max-Q trajectories, was none of the development flights done on such a regime ? Very unlikely. Surely, one development flight would have been on a max-Q trajectory.
3. Sanjay on BR says that he has sources telling him that A-II was not ruggedized while A-III has been ruggedized during the design process itself. This is very possible since A-III has been designed as a weapon from the beginning while A-II has civilian origins. In this specific instance, it makes more sense to push A-III forward than A-II.
4. Especially given that news reports now say A-III is also being inducted. How true is this ?
5. Sanjay also says that there was a successful A-II test on Jun 19 2009. This was reported by very few sources. Not Hemant Rout. Did such a test really take place ? You too said something to this effect around that time on BR.
6. In the long run, given aging issues and the like, canisterization would be the solution.
Sorry for late reply, I was unable to access the forum because of all kinds of connectivity problem.
Trouble shooting flight failure on a missile that is released to user service is more troublesome because it is not as intensely instrumented. Analysis from limited data often lead to many failure modes and in the eventual parato analysis some of have lower probability thus no deeper scrutiny, specially if it is a multi variable problem. So it is possible that it is not caught in first fix.
If it was only INS it will be easy to identify and fix, but it is also very very unlikely that it was only an INS problem, more likely to be a compound problem. Both the failed tests were near Max-Q portion of flight trajectory, and that generally points to control system failure. And Control system spans many subsystems ranging from control laws (software), sensors and actuators.
[/quote]
1. But still, that the INS could underperform is worrying. Does that not have implications for A-III, Shourya, unless INS underperformance was due to extreme abnormal conditions caused by other circumstances. Saraswat's remarks seem to hint at quality control with some mechanical interfaces.
2. Regarding Max-Q trajectories, was none of the development flights done on such a regime ? Very unlikely. Surely, one development flight would have been on a max-Q trajectory.
3. Sanjay on BR says that he has sources telling him that A-II was not ruggedized while A-III has been ruggedized during the design process itself. This is very possible since A-III has been designed as a weapon from the beginning while A-II has civilian origins. In this specific instance, it makes more sense to push A-III forward than A-II.
4. Especially given that news reports now say A-III is also being inducted. How true is this ?
5. Sanjay also says that there was a successful A-II test on Jun 19 2009. This was reported by very few sources. Not Hemant Rout. Did such a test really take place ? You too said something to this effect around that time on BR.
6. In the long run, given aging issues and the like, canisterization would be the solution.