Author Topic: North Korea missiles  (Read 267917 times)

Offline FutureSpaceTourist

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Re: North Korea missiles
« Reply #260 on: 08/18/2017 10:26 pm »
More analysis & speculation on NK indigenous development based on Soviet tech. Claims recent NYT report etc are wrong:

https://www.nknews.org/2017/08/how-north-korea-makes-its-missiles/

Offline Danderman

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Re: North Korea missiles
« Reply #261 on: 08/19/2017 01:04 am »
"The U.S. intelligence community, which usually keeps mum, signaled its own unhappiness with the New York Times, telling the PBS NewsHour, Reuters, CNN, the Wall Street Journal, and the Financial Times that the story was flat wrong. "

Meaning that the Ukrainians did not sell RD-250 engines to NK. This makes sense, since it would be crazy for NK to buy a 2 chambered RD-250 engine, and then cut it in half.  And, as noted before, the HS-12 engine seems to be open cycle, whereas the RD-250 is closed cycle, supposedly.


Offline K210

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Re: North Korea missiles
« Reply #262 on: 08/19/2017 10:39 am »
Assuming that NK has indeed acquired RD-250 designs it is somewhat odd we have not seen any ground tests of both combustion chambers in action at the same time

EDIT: RD-250 has a thrust of 88 tons while the September 2016 engine has a reported test of 80 tons. Does RD-250 have throttling capablity? Very little information about this engine on the internet......
« Last Edit: 08/19/2017 10:42 am by K210 »

Offline Danderman

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Re: North Korea missiles
« Reply #263 on: 08/19/2017 03:33 pm »
Since this is an old Glushko design, there is quite a bit written about the engine in Russian books. My impression at the time was that the engine was low performance, even for its' time period, but perhaps optimized for reliability.

At any rate, it is unlikely that a single chamber version would produce 80 tons of thrust.

Offline Kryten

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Re: North Korea missiles
« Reply #264 on: 08/19/2017 03:37 pm »
 I suspect the 80 ton figure has more to do with South Korea having demonstrated a 75 ton engine than the engine's real performance. On the other hand, US treasury sanctions mentioned an '80 ton booster engine' before NK had made any public statements about it.

Offline Danderman

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Re: North Korea missiles
« Reply #265 on: 08/19/2017 10:59 pm »
Do you have a link to that statement from the US Treasury?

Offline Kryten

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Offline Danderman

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Re: North Korea missiles
« Reply #267 on: 08/20/2017 09:31 pm »
Yeah, that is referring to a rocket rather than an engine. Unha clusters 4 Improved Scud engines for a total thrust around 80 tons.

Note that HS12 is in the same class as the 25 ton thrust HS10; it may be up to 40 tons, but is not twice as powerful, and certainly not 3 times the size.
« Last Edit: 08/20/2017 09:32 pm by Danderman »

Offline Danderman

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Re: North Korea missiles
« Reply #268 on: 08/22/2017 05:49 pm »
https://www.kyivpost.com/ukraine-politics/ukraine-bats-away-claims-supplied-rocket-engines-north-korea.html

Ukraine enumerates the production and location of RD-250 engines since 1991.

Offline russianhalo117

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Re: North Korea missiles
« Reply #269 on: 08/26/2017 04:56 am »
US Pacific Command reports it detected a salvo launch of at least 3 ballistic missiles which all failed at different times of powered flight. Preliminary info is one appeared to be on a heading towards Guam or another US island. An official presser will be made later.

EDIT: verified info:
U.S. Pacific Command‏Verified account @PacificCommand
Statement on latest #NorthKorea violation of @UN Security Council resolutions: 3 SRBM launches; no threat to U.S. territory including #Guam
« Last Edit: 08/26/2017 07:04 am by russianhalo117 »

Online Steven Pietrobon

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Re: North Korea missiles
« Reply #270 on: 08/27/2017 03:18 am »
This report is saying that the missiles previously reported as failing in flight were successful. Range is reported as 250 km, which is within the range of Hwasong-5 (Scud B).

http://www.washingtonexaminer.com/north-korea-missile-launches-did-not-fail-in-flight-as-first-thought/article/2632657
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Re: North Korea missiles
« Reply #271 on: 08/27/2017 12:50 pm »
A Peek Into North Korea’s Missile Future



Online Steven Pietrobon

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Re: North Korea missiles
« Reply #272 on: 08/28/2017 05:55 am »
Screen captures. Looks like a solid motor winding area, possibly for the Pukguksong missiles.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline russianhalo117

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Re: North Korea missiles
« Reply #273 on: 08/28/2017 03:50 pm »
This report is saying that the missiles previously reported as failing in flight were successful. Range is reported as 250 km, which is within the range of Hwasong-5 (Scud B).

http://www.washingtonexaminer.com/north-korea-missile-launches-did-not-fail-in-flight-as-first-thought/article/2632657
Pacific Command still says that on of the missiles failed immediately after launch.
« Last Edit: 08/28/2017 11:18 pm by russianhalo117 »

Offline Star One

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Re: North Korea missiles
« Reply #274 on: 08/28/2017 09:46 pm »

Offline savuporo

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Re: North Korea missiles
« Reply #275 on: 08/29/2017 01:38 am »
Approx flight path

Pretty spooky alleged in-flight pic from the ground in Japan:

https://twitter.com/IntelCrab/status/902326770724110336
« Last Edit: 08/29/2017 01:42 am by savuporo »
Orion - the first and only manned not-too-deep-space craft

Online Steven Pietrobon

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Re: North Korea missiles
« Reply #276 on: 08/29/2017 06:57 am »
Screen captures. Looks like a solid motor winding area, possibly for the Pukguksong missiles.

According to KCNA, this is the Chemical Material Institute of Academy of Defence Science.

"Kim Jong Un Inspects Chemical Material Institute of Academy of Defense Science

Pyongyang, August 23 (KCNA) -- Kim Jong Un, chairman of the Workers' Party of Korea, chairman of the State Affairs Commission of the DPRK and supreme commander of the Korean People's Army, gave field guidance to the Chemical Material Institute of the Academy of Defense Science.

Shaking hands of officials who came out to greet him, respected Supreme Leader Kim Jong Un said that he came to learn about the situation of the institute and help its work. He noted that in recent years the institute has done a lot of jobs in a patriotic drive for breaking through the cutting edge, whether they are known or not, true to the Workers' Party of Korea's policy of attaching importance to the defense science and technology and policy of the munitions industry.

After looking round the newly-built room for the education in the revolutionary history and exhibition hall of scientific and technological achievements, he learned about the processes for manufacturing ICBM warhead tip and solid-fuel rocket engine.

Acquainting himself with the processes for preform weaving by carbon fiber, chemical deposition, high pressure liquid deposition and final treatment, he learned about in detail the density of preform, deposition temperature, vacuum degree and deposition time in the chemical deposition process, deposition temperature, pressure, working medium and deposition frequency in the high pressure liquid deposition process and technological specifications in the final treatment process.

He then made a field survey of the process for manufacturing solid-fuel rocket engine and specified tasks and ways for normalizing the production at a higher level.

He set forth important tasks facing the institute.

He instructed the institute to produce more solid-fuel rocket engines and rocket warhead tips by further expanding engine production process and the production capacity of rocket warhead tips and engine jets by carbon/carbon compound material.

Highly appreciating that it is the pride of our Party to have such unassuming heroes, unit of patriotic scientists as the officials of this institute who have devoted themselves to carrying out the Party's policy of defense science, keeping in mind the pure single mind of loyalty to the Party, whether they are appreciated or not, and gave special thanks and special bonus to them in the name of the Party Central Committee.

He had a photo session with the scientists, technicians and workers of the Chemical Material Institute of the Academy of Defense Science.

Accompanying him were Jo Yong Won and Kim Jong Sik, vice department directors of the C.C., the Workers' Party of Korea. -0-"
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Danderman

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Re: North Korea missiles
« Reply #277 on: 08/30/2017 05:05 am »
CNN reports this latest missile was Hwasong 12. It appears to have traveled about 2,000 miles before disintegration.

Online Steven Pietrobon

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Re: North Korea missiles
« Reply #278 on: 08/30/2017 05:35 am »
Kim’s Visit to the Chemical Material Institute: A Peek Into North Korea’s Missile Future

http://www.38north.org/2017/08/melleman082517/

"Two large posters were also captured in the photos, presenting conceptual illustrations of a new missile, the Pukguksong-3, and the Hwasong-13 (also known as the KN-08), as well as the technical parameters for their composite materials."
« Last Edit: 08/30/2017 05:37 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Lewis007

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Re: North Korea missiles
« Reply #279 on: 08/30/2017 11:54 am »
video of the latest missile launch





 

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