Author Topic: FAILURE: GSLV-F02, Insat-4C, July 10 2006  (Read 21888 times)

Offline Skyrocket

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RE: ISRO launch EXPLODES
« Reply #20 on: 07/11/2006 11:45 AM »
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Zoomer30 - 10/7/2006  12:38 PM

Thats an odd design, solid for the core and liquid for the boosters.  Would not want to put a person on that thing :)

What makes the GSLV even more an oddball is the fact, that the strapons burn longer than the core stage. AFAIK the only launch vehicle with this feature.

Gunter

Offline jschanna

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RE: ISRO launch EXPLODES
« Reply #21 on: 07/12/2006 10:44 AM »
If anyone finds a video..plz let us know.

It was on live telecast on DDIndia ( a news channel in India...try looking there) I cannot access anything else.

Offline Rocket Guy

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Re: ISRO launch EXPLODES
« Reply #22 on: 07/12/2006 11:48 AM »

Offline Space Lizard

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Re: ISRO launch EXPLODES
« Reply #23 on: 07/12/2006 12:03 PM »
It seems the problem occured very early as the rocket veers on the right even as soon as it leaves th pad, before clearing the tower!
I watch rockets

Offline meiza

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Re: ISRO launch EXPLODES
« Reply #24 on: 07/12/2006 12:39 PM »
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Ben - 12/7/2006  12:35 PM

There is video on ABC news via AOL:

http://us.video.aol.com/video.index.adp?mode=2&guideContext=65.73&pmmsid=1675658

Haha, that site won't let me on since I use mozilla here. I thought website denial for browser versions was a nineties thing.
Useless company.

Offline edkyle99

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Re: ISRO launch EXPLODES
« Reply #25 on: 07/12/2006 03:29 PM »
Quote
Ben - 12/7/2006  6:35 AM

There is video on ABC news via AOL:

http://us.video.aol.com/video.index.adp?mode=2&guideContext=65.73&pmmsid=1675658


One early report said that ISRO sent a destruct command, but this video shows that the vehicle began breaking apart and that some fairly large, relatively intact looking pieces fell all the way to the Bay of Bengal.

One AP photo showed what appeared to be a stream of glowing particles falling from the GSLV, possibly from the failing strap-on booster,  as it cleared the tower.  It will be interesting to learn what happened, as the strap-on booster engines have a long, proven history (flew on Ariane 1, etc.).  

 - Ed Kyle

Offline Spirit

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RE: ISRO launch EXPLODES
« Reply #26 on: 07/13/2006 12:37 AM »
"The problem developed during the first stage which means ... the motor was not developing thrust. The failure was not due to a design flaw."
http://www.spacedaily.com/reports/Launch_Failure_Will_Not_Dent_Indian_Space_Program_Say_Officials_999.html
Regards,
Atanas

Offline edkyle99

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RE: ISRO launch EXPLODES
« Reply #27 on: 07/13/2006 03:06 PM »
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Spirit - 12/7/2006  7:24 PM

"The problem developed during the first stage which means ... the motor was not developing thrust. The failure was not due to a design flaw."
http://www.spacedaily.com/reports/Launch_Failure_Will_Not_Dent_Indian_Space_Program_Say_Officials_999.html


Interesting.  The photo that accompanies this story appears to show flames alongside one of the strap-on boosters *before* liftoff.  

 - Ed Kyle

Offline jacqmans

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Re: ISRO launch EXPLODES
« Reply #28 on: 07/14/2006 06:34 AM »
Failure Analysis Committee on GSLV-F02 Constituted  
July 12, 2006  
 
   
 Following the unsuccessful launch of Geosynchronous Satellite Launch Vehicle (GSLV-F02) with INSAT-4C on board from Satish Dhawan Space Centre SHAR (SDSC-SHAR), Sriharikota on July 10, 2006, a Failure Analysis Committee has been constituted by Chairman, ISRO. Mr K Narayana, former Director of SDSC-SHAR and presently Senior Advisor at the Centre chairs the Committee. The 15 member Committee includes experts from academic and research institutions besides those from various Centres of ISRO. The Committee will review the performance of all subsystems of GSLV-F02 from lift-off to the termination of flight, identify specific reasons for anomalies observed and recommend corrective measures for future course of action.

The Committee is expected to submit its report in a month's time.
 

Offline edkyle99

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Re: ISRO launch EXPLODES
« Reply #29 on: 07/25/2006 04:43 PM »
A July 25 news story in The Hindu

http://www.hindu.com/2006/07/25/stories/2006072502691300.htm

says:

"G. Madhavan Nair, Chairman, Indian Space Research Organisation (ISRO), said one of the four strap-on motors recovered has been identified. "We are yet to locate the failed engine," he said on Monday from Bangalore.

"We are hopeful we will recover it in the course of this week. We have a certain hypothesis [on why the flight failed]. If we can recover the failed engine, it will be an added input. It will be definitely an invaluable input." On July 10, a couple of seconds after GSLV-F02 lifted off, one of the four strap-on booster engines strung around the core stage, failed."

 - Ed Kyle

Offline eeergo

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Re: ISRO launch EXPLODES
« Reply #30 on: 09/05/2006 10:54 PM »
First news about the failure investigation:

http://www.hindustantimes.com/news/181_1787434,000600030009.htm

"A defective fuel-control device has been identified as the rogue component that propelled the GSLV (Geosynchronous Satellite Launch Vehicle), with Insat-4C communications satellite on board, off course and into the Bay of Bengal seconds after liftoff on July 10."
-DaviD-

Offline jacqmans

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RE: ISRO launch EXPLODES
« Reply #31 on: 09/06/2006 09:31 PM »
GSLV-F02 Failure Analysis Committee Report

September 6, 2006  
 
   
 The Failure Analysis Committee (FAC), constituted for investigating the failure of ISRO's Geosynchronous Satellite Launch Vehicle, GSLV-F02 mission from Satish Dhawan Space Centre (SDSC SHAR) Sriharikota, on July 10, 2006 has submitted its report.

The 49 metre tall and 414 tonne GSLV comprises three stages. The first stage consists of a solid propellant motor and four liquid propellant strap-ons. The second stage is also a liquid propellant stage and the third is a cryogenic stage.


GSLV-F02 launch was the fourth in the series. All the three earlier missions (GSLV-D1, D2 and F01) were completely successful. The mission objective of GSLV-F02 was to place INSAT-4C, an operational satellite into Geo-synchronous Transfer Orbit (GTO). About 55 sec into the flight, GSLV-F02 started deviating significantly from its nominal flight path resulting in the vehicle breaking up at 62 sec after lift-off. The debris fell into Bay of Bengal.

The 15 member FAC chaired by Mr K Narayana, former Director of SDSC SHAR, with the participation of experts from academic and research institutions besides ISRO, has reviewed the performance of GSLV-F02 from lift-off to the end of flight. FAC had detailed deliberations for over 100 hours in several sittings and was assisted by eight specialist sub-committees examining the flight data of vehicle subsystems, manufacturing documents, inspection, calibration and test results, etc. Especially, the details related to the realisation of liquid propulsion stage of GSLV were closely scrutinized. Several tests simulating possible failure modes were also conducted to identify the exact cause.

FAC has concluded that the performance of all vehicle subsystems, except one strap-on stage was normal until 56.4 sec. The primary cause for the failure was the sudden loss of thrust in one out of the four liquid propellant strap-on stages (S4) immediately after lift-off at 0.2 sec. With only three strap-on stages working, there was significant reduction in the control capability. However the vehicle attitude could be controlled till about 50 sec. At the same time the vehicle reached the transonic regime of flight and the vehicle attitude errors built up to large values, resulting in aerodynamic loads exceeding the design limits thus leading to break up of the vehicle.

The thrust of the liquid engines used in the strap-on stages is precisely controlled by a set of regulators. Detailed analyses have indicated that in S4 engine the thrust control was not effective. Instead of stabilizing at 5.85 MPa (Mega Pascal) chamber pressure, it reached 7.11 MPa at 2.8 sec. This was much beyond the design limits and the engine failed at 0.2 sec after lift-off, that is 5 sec after its ignition.

Simulations and analyses of flight data and verification through calibration tests have led to the conclusion that the propellant regulator in the failed engine had much higher discharge coefficient in its closed condition. The reason for this could be an inadvertent error in manufacturing, which escaped the subsequent inspection, and acceptance test procedures. This regulator has functioned satisfactorily in all the previous 50 engines manufactured and tested so far.

The larger flow of propellant led to higher operating pressure in the gas generator (4.7 MPa against design specification of 3.6 MPa). Due to this higher operating pressure of the gas generator, the water flow rate into it got reduced. The combined effect of larger flow of propellants and reduced flow of water led to a very high gas temperature of 1823 K against design specification of 900 K and pressure of 4.7 MPa against the design specification of 3.6 MPa. The very high operating pressure and temperature resulted in the structural failure of the gas generator. The consequent abrupt stopping of the turbo pumps that feed propellants at very high pressures to the engines led to loss of thrust of S4 engine. The water calibration tests conducted simulating the malfunction of the propellant regulator hardware could closely reproduce the flight phenomenon thereby confirming the larger flow area.

FAC has concluded that the design of GSLV is robust and recommended implementation of strict control on fabrication, inspection and acceptance procedures. Among others, FAC has recommended fabrication processes to be critically reviewed and updated. It has recommended for independent inspection of all critical dimensions of components and subassemblies by in-house agencies. Further, long duration hot test on one out of every 20 engines fabricated has been recommended to ensure that production process is under control. In addition, FAC has recommended strengthening the process of clearance of launch during Automatic Launch Sequence (ALS) phase.

FAC conclusions and recommendations have been accepted and necessary action has been initiated to implement all of them.
 

Offline MartianBase

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RE: ISRO launch EXPLODES
« Reply #32 on: 09/27/2006 09:17 PM »
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Zoomer30 - 10/7/2006  12:34 PM

Thats an odd design, solid for the core and liquid for the boosters.  Would not want to put a person on that thing :)

India aren't doing manned missions

Offline JulesVerneATV

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RE: ISRO launch EXPLODES
« Reply #33 on: 11/06/2006 06:10 AM »
Strap-On Engine Caused GSLV Failure

http://www.spacedaily.com/reports/Strap_On_Engine_Caused_GSLV_Failure_999.html

The S4 strap-on engine whose malfunction caused the failure of GSLV rocket on July 10, 2006 off Sriharikota may have "totally disintegrated." Secretary Earth Sciences PS Goel said there was a possibility of the engine having been completely destroyed as they had found melted, twisted and broken metallic parts of S4's lower stage within one kilometer radius of S4 nose cone which had been recovered from the sea bed in Bay of Bengal in October along with middle parts of the stage and base plate electronics.

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