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Experts Ponder Cause of N.Korean Rocket Failure
Chosun Ilbo ^ | 04/16/12

Posted on 04/16/2012 7:25:22 AM PDT by TigerLikesRooster

Experts Ponder Cause of N.Korean Rocket Failure

North Korea's rocket exploded two minutes and 15 seconds after launch, disintegrated into some 20 fragments and fell into the West Sea. The North unusually admitted the failure. Rocket experts attribute it to a problem with the first-stage booster, failed separation of boosters or a rushed launch schedule.

◆ Booster Problems

The first-stage booster exploded into about 20 fragments scattered over waters west of Taean far away from the point west of the Byeonsan Peninsula where the regime had predicted they would land.

About 56 percent of launch failures are caused by a problem with the first stage. The explosion is believed to have been caused by a fuel leak from a propellant engine or a turbopump malfunction rather than booster separation. Yoon Woong-sup, a professor of mechanical engineering at Yonsei University, said, "If a problem occurs during the booster separation process, there is low possibility that the first-stage booster will explode because its fuel is already spent."

But Cho Kwang-rae, the head of the Korea Aerospace Research Institute's satellite launch project, said, "Nobody can rule out that a problem occurred during the separation of the first-stage booster."

Considering that another rocket failed to place a satellite into orbit due to insufficient liftoff thrust in 2009, the North may have overcompensated and increased the engine's liftoff thrust too much this time. Or the rocket may have been exploded by remote control, or an automatic explosion trigger was activated when the rocket veered off course, other experts speculate.

◆ Rushed Launch

Still others speculate that the accident occurred because the North rushed the launch to coincide with the centenary of nation founder Kim Il-sung. It is unclear why the regime launched the rocket from a fog-shrouded launch pad on Friday morning, a day earlier than experts had predicted.

"Given the insufficient preparations at the Tongchang-ri launch pad, we got the impression that the North was in a hurry," a South Korean government official said. "The regime may have been negligent in the final checkup" because other pressing centenary events lay ahead over the coming days.

◆ No Progress

In April 2009, the rocket failed to enter orbit, but the second- and third-stage boosters separated successfully. But this time, even the first-stage booster failed to separate and exploded in midair. The North has so far failed four times to launch long-range missiles or rockets since the first one in 1998.

A South Korean military source said, "Even in some advanced countries, rockets have exploded on their launch pads. That doesn't mean the North's missile technology has regressed."

"It's true that the North's long-range rockets still lag far behind those in the West in terms of appearance, but it seems that the technology has gradually improved since 1998," a rocket expert said.


TOPICS: Extended News; Foreign Affairs; News/Current Events
KEYWORDS: crash; nkorea; rocket

1 posted on 04/16/2012 7:25:31 AM PDT by TigerLikesRooster
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To: TigerLikesRooster; AmericanInTokyo; Steel Wolf; nuconvert; MizSterious; nw_arizona_granny; ...

P!


2 posted on 04/16/2012 7:26:51 AM PDT by TigerLikesRooster (The way to crush the bourgeois is to grind them between the millstones of taxation and inflation)
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To: TigerLikesRooster

3 posted on 04/16/2012 7:28:50 AM PDT by jiggyboy (Ten percent of poll respondents are either lying or insane)
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To: TigerLikesRooster
IIRC, all their rockets have failed.

I send the Koreans Greetings and Remember: Spit in the sky, come back in your eye. Bye, bye!!

4 posted on 04/16/2012 7:29:43 AM PDT by Sacajaweau
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To: TigerLikesRooster
It is really funny that bunch of foreign journalists went to N. Korea to cover the rocket launch, filing out first-hand reports to the world, only to discover that news broke outside NK first. An embarrassing episode for them.

http://english.chosun.com/site/data/html_dir/2012/04/16/2012041601282.html

Foreign Correspondents Kept in Dark Over Rocket Launch

Some 70 foreign journalists who went to North Korea between April 6 and 7 in the hope of witnessing the scheduled rocket launch left disappointed and were not even at the launch site on Friday morning. News of the failed launch reached South Korea at 8:25 a.m., but the reporters in Pyongyang were left in ignorance.

The regime pretended that it knew nothing when the journalists complained and told them to report to the Yanggakdo Hotel, where it would make an official announcement before 9 a.m. But they were offered no explanation. The official [North] Korean Central News Agency reported the failure at 12:03 p.m., and the press conference was finally held at 1:40 p.m.

The reporters had to settle for the unveiling of gigantic statues of Kim Il-sung and Kim Jong-il in Mansudae at 6 p.m. on Friday.

5 posted on 04/16/2012 7:30:34 AM PDT by TigerLikesRooster (The way to crush the bourgeois is to grind them between the millstones of taxation and inflation)
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To: TigerLikesRooster

Dear Leader touts missile launch as a smashing success.


6 posted on 04/16/2012 7:30:50 AM PDT by moovova
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To: TigerLikesRooster
"Experts Ponder Cause of N.Korean Rocket Failure?" Ponder no further...
7 posted on 04/16/2012 7:31:20 AM PDT by AngelesCrestHighway
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To: TigerLikesRooster

Perhaps they self-destructed it.

With threats from Japan to shoot it down, and threats against it’s violating other countries airspace maybe they dedcided to show their arrogance by firing it ,but thought better about allowing it to force them into a more dangerous confrontation.


8 posted on 04/16/2012 7:33:38 AM PDT by Venturer
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To: TigerLikesRooster

The US has an experimental High Energy Laser platform based on a 747. I wonder if it might have been cruising in the area. It has been used to cause exactly this type of failure. It’s unlikely that anyone would have noticed it up there.


9 posted on 04/16/2012 7:34:10 AM PDT by BillM (.)
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To: TigerLikesRooster

Cause of failure? It exproded.


10 posted on 04/16/2012 7:37:35 AM PDT by ElkGroveDan (My tagline is in the shop.)
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To: jiggyboy
"This does not honor my memory!"
11 posted on 04/16/2012 7:37:58 AM PDT by AngelesCrestHighway
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To: TigerLikesRooster

Simple they are inferior to us. Not that we did not have many failures but being superior we have advanced much further and much quicker that these, Oh so easy to be offended, central planners. Like China, if they cannot steal the technology, they would be another 20+ years behind the times. But they would be offended if anyone said that. TFB.

Which brings up a point: Did you ever notice that what ever group we may be discussing, those who are easy to offend are also inferior and are not advancing at the same rate as the rest of civilization. Mudslimes come to mind immediately.


12 posted on 04/16/2012 7:38:22 AM PDT by Wurlitzer (Welcome to the new USSA (United Socialist States of Amerika))
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To: jiggyboy

The guy holding the first and second stages together let go tooooo early ?


13 posted on 04/16/2012 7:39:26 AM PDT by molson209
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To: BillM
The US has an experimental High Energy Laser platform based on a 747...

My thoughts exactly! Of course after Hussein, The Traitor, "shares" our technology with his bud Vlad and the russkies, the NORKS will soon know how to counter any of our defenses.

14 posted on 04/16/2012 7:39:32 AM PDT by The Sons of Liberty (Sworn to Defend The Constitution Against ALL Enemies, Foreign and Domestic. So Help Me GOD!)
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To: BillM
This is the first thing I thought of when I heard that it failed. I agree, using a laser to destroy the rocket would probably leave no evidence, especially if NK cannot recover the broken pieces.

Congrats DARPA!

15 posted on 04/16/2012 7:39:32 AM PDT by lormand (A Government who robs Peter to pay Paul, will always have the support of Paul)
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To: TigerLikesRooster

Or maybe an accidental collision with an SM3? Or a laser?


16 posted on 04/16/2012 7:40:38 AM PDT by Little Ray (FOR the best Conservative in the Primary; AGAINST Obama in the General.)
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To: TigerLikesRooster
The explosion is believed to have been caused by a fuel leak from a propellant engine or a turbopump malfunction rather than booster separation.

Airborne Lasers will do that!

17 posted on 04/16/2012 7:41:56 AM PDT by Tallguy (It's all 'Fun and Games' until somebody loses an eye!)
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To: TigerLikesRooster

made in china


18 posted on 04/16/2012 7:46:10 AM PDT by JohnBrowdie (http://forum.stink-eye.net)
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To: TigerLikesRooster
Hmmm...it would be to think that one of those "cancelled" 747 Airborne Laser (ABL) platforms was covertly in the area and took it down.

Under a BUsh or Reagan that might have happened...but sadly, not really possible or probable under this Administration.

But we do have the capability.

The Man Who Despises America
http://www.jeffhead.com/obama-time.htm

America at the Crossroads of History
http://www.jeffhead.com/crossroads.htm

19 posted on 04/16/2012 7:47:00 AM PDT by Jeff Head (Freedom is not free, never has been, never will be (www.dragonsfuryseries.com))
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To: TigerLikesRooster
My take? They are self-handcuffed victims of their very own odd, eery, obsessive preoccuption with Great Socialist anniversaries of this, than and the other. Endemic in Ccommunist socieies, and particular in the most dictatorial of them. It is one of the only ways to keep the starving, enslaved and otherwise deprived "People" preoccupied on Bread and Circuses so they dont get pissed off and turn on the National Palace of the Maximum Leader.

I guess they rushed it, to keep from losing face, the foreign press there made additional pressure. My guess? Next time, they will invite no foreign press observers.

20 posted on 04/16/2012 7:48:02 AM PDT by AmericanInTokyo (Study closely socialist Hugo Chavez' usage of 'popular masses' in the streets to thwart 1992 coup)
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To: TigerLikesRooster
My take? They are self-handcuffed victims of their very own odd, eery, obsessive preoccuption with Great Socialist anniversaries of this, that and the other. Endemic in Ccommunist socieies, and particular in the most dictatorial of them. It is one of the only ways to keep the starving, enslaved and otherwise deprived "People" preoccupied on Bread and Circuses so they dont get pissed off and turn on the National Palace of the Maximum Leader.

I guess they rushed it, to keep from losing face, the foreign press there made additional pressure. My guess? Next time, they will invite no foreign press observers.

21 posted on 04/16/2012 7:48:31 AM PDT by AmericanInTokyo (Study closely socialist Hugo Chavez' usage of 'popular masses' in the streets to thwart 1992 coup)
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To: TigerLikesRooster
Those turbo pumps are tricky. I read an account of the failures of the Shuttle Main Engines, SSMEs. A lot were due to turbo pump problems but what really stood out was that a run away turbo pump could reach 400,000 RPMs in one second leading to self destruction before it reached that number.

The engineers were complaining that the monitoring they were doing couldn't react fast enough due to slow computers to stop the overrun in time to save the engine and turbopump.

I think this is the writeup:
SSME history in several parts

From part III:
If only the normal operating torque were applied to the HPOTP without the fluid load applied (gas in the pump or in cavitation) it could accelerate from a dead stop to a destructive overspeed condition in less than a tenth of a second. The acceleration rate under this condition is almost 400,000 rpm per second.

22 posted on 04/16/2012 7:55:53 AM PDT by Lx (Do you like it, do you like it. Scott? I call it Mr. and Mrs. Tennerman chili.)
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To: moovova
Dear Leader touts missile launch as a smashing success.

In a sense it was in that they launched it in obama's face after his failed negotiations.

23 posted on 04/16/2012 7:58:06 AM PDT by jersey117 (The Stepford Media should be sued for malpractice)
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To: TigerLikesRooster
I believe I have found the culprit:


24 posted on 04/16/2012 8:04:52 AM PDT by T-Bird45 (It feels like the seventies, and it shouldn't.)
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To: TigerLikesRooster

Their rockets fail because their rocket scientists know as much about rockets as the Obamaloon knows about the constitution.


25 posted on 04/16/2012 8:06:08 AM PDT by Da Coyote
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To: Jeff Head

I was curious about whether the rocket had even reached a high enough altitude for us to take it out in that manner. Though I tend to agree: not convinced at all that this administration would have opted to do that in any case.


26 posted on 04/16/2012 8:15:38 AM PDT by alancarp (Liberals are all for shared pain... until they're included in the pain group.)
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Click his tootsies!

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27 posted on 04/16/2012 8:17:06 AM PDT by TheOldLady (FReepmail me to get ON or OFF the ZOT LIGHTNING ping list)
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To: Lx
Those turbo pumps are tricky.

And probably unnecessary at the technology level they're trying to achieve. They could easily produce pressure fed or gas pumped designs which might not achieve the pinnacle of mass ratio, but would have the decided quality of being more reliable. Even under duress of bad management decisions. I noticed the nuke programs (eg the Paki one too) had similar rigidity of design selection. Maybe the management culture doesn't reward innovation. Perhaps they might be more successful with an upper management change...?

Heheh...

28 posted on 04/16/2012 8:21:46 AM PDT by no-s (when democracy is displaced by tyranny, the armed citizen still gets to vote)
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To: TigerLikesRooster

It’s quite simple: Inferior, Chinese-made tinker toys.


29 posted on 04/16/2012 8:32:01 AM PDT by jda ("Righteousness exalts a nation . . .")
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To: BillM
The US has had an experimental ....

"Funding for the program was cut in 2010 and the program was canceled in December 2011. It made its final flight on February 14, 2012 to Davis–Monthan Air Force Base in Tucson, Arizona to be prepared and kept in storage at the "Boneyard" by the 309th Aerospace Maintenance and Regeneration Group."

30 posted on 04/16/2012 8:39:39 AM PDT by jpsb
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To: jpsb

31 posted on 04/16/2012 8:53:20 AM PDT by Arkansas Toothpick
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To: TigerLikesRooster

Natural gas leak.


32 posted on 04/16/2012 9:29:43 AM PDT by blueunicorn6 ("A crack shot and a good dancer")
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To: Wurlitzer
We have regressed too. We went from the shuttle back to rockets. We are hitching rides into space with the Russkies. I always thought that we should have just made newer up to date versions of the shuttle because we knew that it worked.
33 posted on 04/16/2012 9:45:15 AM PDT by USAF80
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To: TigerLikesRooster

All chinese made products are poor quality....


34 posted on 04/16/2012 9:46:32 AM PDT by Cronos (**Marriage is about commitment, cohabitation is about convenience.**)
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To: molson209
The guy holding the first and second stages together let go tooooo early ?

Pretty damning indictment of the substandard quality of Dear Leader's in-flight missile mechanics.

35 posted on 04/16/2012 10:02:14 AM PDT by Night Hides Not (My dream ticket for 2012 is John Galt & Dagny Taggart!)
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To: no-s

Hell, they could use the one the V2 used. All it was powered by was Hydrogen Peroxide (not your normal 3%) and passed through a silver screen. It was enough to power the V2.

If they were smart, they would use the J2 style engines in the Saturn 2nd stage. They still used turbopumps but they weren’t under as much stress as the SSMEs or the 1st stage Saturn’s. They also, if they’re smart, get the extra thrust put out by the turbopump’s power section instead of wasting it like I believe we did with the Atlas rockets.


36 posted on 04/16/2012 10:12:52 AM PDT by Lx (Do you like it, do you like it. Scott? I call it Mr. and Mrs. Tennerman chili.)
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To: TigerLikesRooster

Zer0 could get some street creds if he would claim responsibility for the NORK bottle rocket blowing up shortly off the launch pad.


37 posted on 04/16/2012 10:44:18 AM PDT by B.O. Plenty (Elections have consequences....)
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