Author Topic: KARI: KSLV-II Development Updates and Discussion Thread  (Read 46113 times)

Offline Steven Pietrobon

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #40 on: 11/30/2018 04:18 am »
The KARI blog shows the TLV configuration. Half the rocket is just empty space.

https://blog.naver.com/karipr/221407284696
« Last Edit: 11/30/2018 04:20 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline wesley

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #41 on: 11/30/2018 04:44 am »
Is the first stage of this test vehicle essentially the second stage of the planned KSLV-II?  Or is it merely the same 2.6 meter diameter as the second stage?

 - Ed Kyle

IIRC it uses the same structure as the planned KSLV-II 2nd stage but uses only a single engine: https://forum.nasaspaceflight.com/index.php?topic=38220.20
Right, but note that the KSLV-2 second stage will also only use one engine, albeit with either a vacuum-optimized engine version or with a nozzle extension. 

 - Ed Kyle

There is no sure way of knowing on a highly technical level but by infering from Korean media reports it seems like the TLV has a single first-stage/sea-level engine from the actual KSLV-2, identical propellant tank design and outer mold line to KSLV-2 second stage, a dummy payload on top that laregly resembles the outer mold line of the KSLV-2 stage 3 and fairing, and additional avionics/interfaces so it can be launched from the ground.
The official website mentions that the engine is supposed to be equivalent to the 2nd stage of the KSLV-II, but you are correct that it would be the sea-level version instead of the vacuum version due to the difference in the altitude where the engine would be lit.

According to a Korean news article, there's currently a sea-level KARI 75-Ton engine #11 for the first stage, a vacuum KARI 75-Ton engine for the second stage, and a KARI 7-Ton engine #4 for the third stage currently installed in the test building for performance testing. So all three types of engines that go into the KSLV-II proper are already well into development.

https://news.v.daum.net/v/20181130030106646

The KARI blog shows the TLV configuration. Half the rocket is just empty space.

https://blog.naver.com/karipr/221407284696
The top half is the mass simulator that weighs roughly 8 tons, which is supposed to accurately simulate the dimensions and the mass of the KSLV-II 3rd stage according to the official website. So it's not an empty space but a hunk of metal.

https://kslvii.kari.re.kr/modedg/contentsView.do?ucont_id=CTX000005&srch_menu_nix=b1lD3n75
« Last Edit: 11/30/2018 04:59 am by wesley »

Offline Lucid Nonsense

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #42 on: 11/30/2018 06:02 am »
Is the first stage of this test vehicle essentially the second stage of the planned KSLV-II?  Or is it merely the same 2.6 meter diameter as the second stage?

 - Ed Kyle

IIRC it uses the same structure as the planned KSLV-II 2nd stage but uses only a single engine: https://forum.nasaspaceflight.com/index.php?topic=38220.20
Right, but note that the KSLV-2 second stage will also only use one engine, albeit with either a vacuum-optimized engine version or with a nozzle extension. 

 - Ed Kyle

There is no sure way of knowing on a highly technical level but by infering from Korean media reports it seems like the TLV has a single first-stage/sea-level engine from the actual KSLV-2, identical propellant tank design and outer mold line to KSLV-2 second stage, a dummy payload on top that laregly resembles the outer mold line of the KSLV-2 stage 3 and fairing, and additional avionics/interfaces so it can be launched from the ground.
The official website mentions that the engine is supposed to be equivalent to the 2nd stage of the KSLV-II, but you are correct that it would be the sea-level version instead of the vacuum version due to the difference in the altitude where the engine would be lit.

According to a Korean news article, there's currently a sea-level KARI 75-Ton engine #11 for the first stage, a vacuum KARI 75-Ton engine for the second stage, and a KARI 7-Ton engine #4 for the third stage currently installed in the test building for performance testing. So all three types of engines that go into the KSLV-II proper are already well into development.

https://news.v.daum.net/v/20181130030106646

The KARI blog shows the TLV configuration. Half the rocket is just empty space.

https://blog.naver.com/karipr/221407284696
The top half is the mass simulator that weighs roughly 8 tons, which is supposed to accurately simulate the dimensions and the mass of the KSLV-II 3rd stage according to the official website. So it's not an empty space but a hunk of metal.

https://kslvii.kari.re.kr/modedg/contentsView.do?ucont_id=CTX000005&srch_menu_nix=b1lD3n75



This image should clarify further. SL Engine, Propelant tanks, interstage (sans serperation hardware), and KSLV-2 3rd stage + fairing + satellite mass/aerodynamic simulator. 
« Last Edit: 11/30/2018 10:31 am by Lucid Nonsense »

Offline russianhalo117

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #43 on: 11/30/2018 08:38 pm »
The KARI blog shows the TLV configuration. Half the rocket is just empty space.

https://blog.naver.com/karipr/221407284696
The third stage was not ready and was decided to drop it from TLV (TLV-1). KARI if needed will make a second TLV launch (TLV-2) if they decide there is a need to test fly stage 3 before the first flight of KSLV-II (NURI)

Offline wesley

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #44 on: 12/01/2018 01:33 am »
The KARI blog shows the TLV configuration. Half the rocket is just empty space.

https://blog.naver.com/karipr/221407284696
The third stage was not ready and was decided to drop it from TLV (TLV-1). KARI if needed will make a second TLV launch (TLV-2) if they decide there is a need to test fly stage 3 before the first flight of KSLV-II (NURI)
Second launch of TLV would have occurred in 2019 if the this one was unsuccessful. I wonder if KARI will still devote resources to test the 3rd stage in the way you mentioned. No doubt I'll go see it if it happens.

Offline yoichi

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #45 on: 12/08/2018 08:00 am »
Korea's staged combustion cycle rocket engine test (100s)
On November 28, KSLV-II TLV was successfully launched to qualify Korea's 75tonf liquid-engine. So, now Korea has two gas generator cycle engines : KRE-007 & KRE-075.
Now, a new engine is being developed to enhance performance : It's a Staged combustion cycle engine! It is more complex than gas generator cycle, but more efficient. So, it'll be used in the upper stage of future Korean launch vehicles.
This video is showing the test (12/6) of the 9tonf staged combustion cycle engine, which was developed in Korea. (Maybe called as KRE-009?) Burn time was 100 seconds, which was success.
Video credit = KARI



Offline yoichi

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« Last Edit: 12/11/2018 06:21 am by yoichi »

Online Tywin

Korea's staged combustion cycle rocket engine test (100s)
On November 28, KSLV-II TLV was successfully launched to qualify Korea's 75tonf liquid-engine. So, now Korea has two gas generator cycle engines : KRE-007 & KRE-075.
Now, a new engine is being developed to enhance performance : It's a Staged combustion cycle engine! It is more complex than gas generator cycle, but more efficient. So, it'll be used in the upper stage of future Korean launch vehicles.
This video is showing the test (12/6) of the 9tonf staged combustion cycle engine, which was developed in Korea. (Maybe called as KRE-009?) Burn time was 100 seconds, which was success.
Video credit = KARI



The engine specification  8)

https://twitter.com/Kor_Spaceflight/status/1071394161033539584
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Offline Lucid Nonsense

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #48 on: 12/11/2018 03:28 pm »
That particular twitter is repackaging what is in the public domain + stuff in papers in English which is good as it can reach a wider audience.

I think he has explained most stuff about what will happen in the future.

Launch vehicle plans:
1. KSLV-2 (Similar to Ariane 1 but with RP-1/LOX engines)
2. SSLV (Similar to KSLV-2 TLV)
3. GEO-SLV (Similar to Ariane 4 but with RP-1/LOX engines and only liquid boosters until a political agreement for solids with the US)

Engine plans:
1. Upgrading the 75tonf engines to 90tonf
2. Developing an 8~10tonf closed-cycle RP-1/LOX upper stage engine for enhanced performance for higher orbits

GEO-SLV launch sites/trajectories:
1. Launch from Naro (Planned, most likely)
2. East sea near DMZ (Threads the needle over the Tsugaru Strait)
3. Sea launch at the equator
(Ignore 2 and 3, using Naro is 99% a done deal too many complications with the others)

Extra:
Possible improvement of KSLV-2 performance with better structural mass ratio + improved engines (No stretch)

Sources (Papers under https://creativecommons.org/licenses/by-nc/3.0/):
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE07156787
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE07414589
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE07543940

Offline Mammutti

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #49 on: 12/29/2020 11:50 am »
https://twitter.com/Kor_Spaceflight/status/1343894686197448704

Quote from: S.Korean Spaceflight
The first launch of the KSLV-II has been postponed to November 2021. The reason is: modification of the assembly procedure, delay in parts delivery, need for more time in stage assembly, and the need for Wet Dress Rehearsal. Second launch is May 2022.

Offline Mammutti

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #50 on: 01/28/2021 09:15 am »
https://twitter.com/Kor_Spaceflight/status/1354712554635816961

Quote from: S.Korean Spaceflight
A SUCCESSFUL hot fire test of KSLV-II first stage! 4 KRE-075 engines were fired simultaneously at the Naro Space Center. More info coming out soon

Offline whiztech

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #51 on: 02/25/2021 08:32 am »
https://www.facebook.com/karipr/posts/3670431673064721

Google translation:

Quote
Today, at the Naroju Center, the second combustion test of the first stage propulsion engine of the Korean launch vehicle “Nuri” was held. The burning time in the first test was 30 seconds, whereas in this second test, it burned for 100 seconds.
Through this test, we were able to confirm engine performance, such as propellant supplied to the engine normally and combustion proceeded stably. We ask for your support for the launch of Nuriho!

https://twitter.com/kari2030/status/1364855679815536645

Google translation:

Quote
#Successful 2nd Comprehensive Combustion Test by the Nuri 1st Stage Engine!

The combustion time in the first test was 30 seconds, but in this second test, combustion was conducted for 100 seconds, and the engine performance was confirmed, such as the propellant supplied to the engine normally and the combustion proceeded stably.

edit: adding video

Google translation:

Quote
Korean-type launch vehicle Nuri, 1 step 100 second comprehensive combustion test success!

Nuriho 1-stage QM 100 second comprehensive combustion test success!

The combustion time of the first test was 100 seconds longer than 30 seconds, and the propellant was normally supplied to the engine and the combustion proceeded stably, confirming the engine performance.

We ask for your support for the launch of Nuriho!

« Last Edit: 02/25/2021 08:42 pm by whiztech »

Offline Mammutti

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #52 on: 03/25/2021 09:36 am »


https://twitter.com/Kor_Spaceflight/status/1375030779294588930

Quote from: S.Korean Spaceflight
Four KRE-075 engines firing simultaneously for 125.5 seconds! This was the final hot fire test of KSLV-II first stage, and was a success!

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Offline edkyle99

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #54 on: 03/27/2021 12:56 am »

The shutdown sound at about 2:10 in this video may be the coolest rocket engine noise I've heard.

 - Ed Kyle
« Last Edit: 03/27/2021 12:57 am by edkyle99 »

Offline PM3

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #55 on: 04/03/2021 02:58 pm »
Has a payload been announced for first launch?
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Offline Bean Kenobi

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #56 on: 04/03/2021 03:42 pm »
Has a payload been announced for first launch?

http://www.businesskorea.co.kr/news/articleView.html?idxno=63539

Quote
KSLV-2 is scheduled to carry a satellite mock-up and the second launch scheduled for May next year is to include a demonstration satellite of less than 200 kg along with a micro cube set.

Offline GraniteHound92

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #57 on: 06/01/2021 01:47 pm »
Nuri (KSLV-II) pathfinder rolled to pad.

https://en.yna.co.kr/view/AEN20210601002651320

Launch expected in October.

Offline Vahe231991

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #58 on: 07/01/2021 12:41 am »
Nuri (KSLV-II) pathfinder rolled to pad.

https://en.yna.co.kr/view/AEN20210601002651320

Launch expected in October.
If the maiden launch of the the Nuri goes as planned, then South Korea will have launched a truly homegrown space launch vehicle, because the first stage of the Naro was built in Russia whereas the second stage was built in South Korea, and the South Koreans were shocked to see North Korea beat the South in putting a satellite into orbit.

Offline Davidthefat

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Re: KARI: KSLV-II Development Updates and Discussion Thread
« Reply #59 on: 07/01/2021 06:48 am »
Nuri (KSLV-II) pathfinder rolled to pad.

https://en.yna.co.kr/view/AEN20210601002651320

Launch expected in October.
If the maiden launch of the the Nuri goes as planned, then South Korea will have launched a truly homegrown space launch vehicle, because the first stage of the Naro was built in Russia whereas the second stage was built in South Korea, and the South Koreans were shocked to see North Korea beat the South in putting a satellite into orbit.

The Nodong engines are scaled up SCUD engines, so based on a relatively reliable design. But yes, certainly seeing North Korea make it to space earlier than South Korea did was surprising. I reckon that was partially at fault of politics, certainly South Korea had the manpower with the skillsets and industry to support such endeavor to achieve it much earlier.

 

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