South Korea’s Nuri Booster Failed Due to Design Flaw

Nuri rocket on the launch pad at the Naro Space Center. (Credit: KARI)

An investigation has found that a design flaw in the third stage doomed the maiden launch of South Korea’s Nuri (KSLV-II) launcher on Oct. 21, according to a press release from the Korea Aerospace Research Institute (KARI).

The investigation found that the third stage engine shut down prematurely due to a leak in the third stage oxidizer tank. The leak was caused when a helium tank broke loose due to a design flaw, the statement said.

A dummy payload was released, but it was not able to enter orbit due to the premature engine shutdown. KARI has said that the first two stages performed as expected.

KARI had previously announced plans to launch the second Nuri rocket on May 19. KARI has not announced whether that flight will be delayed due to the need to fix the design flaw with the third stage helium tank.

Nuri is South Korea’s first domestically produced launch vehicle. It is designed to place payloads weighing up to 1,500 kg into low Earth orbit.

2018 Was Busy Year for Suborbital Flight Tests

SpaceShipTwo fires its hybrid engine. (Credit: Kenneth Brown)

Part 2 of 2

by Douglas Messier
Managing Editor

There were 15 flight tests of eight suborbital boosters in 2018, including six flights of two vehicles — Virgin Galactic’s SpaceShipTwo and Blue Origin’s New Shepard — that are designed to carry passengers on space tourism rides.

The race to provide launch services to the booming small satellite industry also resulted in nine flight tests of six more conventional boosters to test technologies for orbital systems. Two of the boosters tested are designed to serve the suborbital market as well.

A pair of Chinese startups took advantage of a loosening of government restrictions on launch providers to fly their rockets two times apiece. There was also suborbital flight tests of American, Japanese and South Korean rockets.

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Suborbital Flights Stopped Being So Humdrum in 2018

Virgin Galactic SpaceShipTwo’s first flight above 50 miles on Dec. 13, 2018. (Credit: Virgin Galactic)

Part 1 of 2

by Douglas Messier
Managing Editor

Throughout the Space Age, suborbital flight has been the least exciting segment of the launch market. Operating in the shadow of their much larger orbital cousins, sounding rockets carrying scientific instruments, microgravity experiments and technology demonstrations have flown to the fringes of space with little fanfare or media attention.

The suborbital sector has become much more dynamic in recent years now that billionaires have started spending money in it. Jeff Bezos’s Blue Origin and Richard Branson’s Virgin Galactic both made significant progress last year in testing New Shepard and SpaceShipTwo, respectively. Their achievements have raised the real possibility of suborbital space tourism flights in 2019. (I know. Promises, promises…. But, this year they might finally really do it. I think.)

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South Korea’s Future Plans in Space

KARI President Seung-Jo Kim

JAXA has posted a Q&A with Seung-Jo Kim, President of the Korea Aerospace Research Institute (KARI). Most of the interview relates to growing cooperation between KARI and JAXA, but there is a good overview of South Korea’s plans in rocketry, ISS experiments and lunar exploration for the next decade. Key excerpts from the conversation follow.

On Rocket Development

“Korea’s space policy is part of the Basic Space Development Promotion Plan, which was based on the Basic Space Development Promotion Act, enacted in 2005. In particular, we emphasize the development of a purely domestic satellite launch rocket called KSLV-2. Our major goal is to launch a domestic satellite on a domestic rocket, making use of the technology and experience gained through the development of the Naro rocket.

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