This is a 75-ton rocket engine, dubbed the heart of the Nuri space rocket.
For the first stage of the three-stage launch of the Nuri, which was tested in October of last year, four of these 75-ton liquid engines were clustered together, to create an engine capacity of 300 tons.
For the second stage of the Nuri space rocket launch, which is scheduled for June 15, a single 75-ton engine will be tested.
These engines use advanced technology, with kerosene as fuel, and liquid oxygen and jet fuel as oxidizing agents.
Though the first stage launch last fall failed to deliver its mock payload into orbit, its smooth flight marked a milestone in South Korea's aerospace history.
The Nuri space rocket is South Korea's first completely domestically developed launch vehicle, meaning its heart - the engine - is completely homegrown.
"The greatest significance is that the entire process, from design, manufacture and testing of this Korean launch vehicle was done independently in Korea. And the first liquid rocket engine has also been designed, developed and tested domestically."
The private company in charge of developing the engine has already shipped out Nuri's 75-ton engine. But they are not finished yet. South Korea has become the seventh country in the world to possess homegrown space vehicle technology, which sets the stage for the country's space industry to grow and innovate further, beyond the lunar orbit and to greater space expeditions.
"The original plan was to make a space rocket to launch into lunar orbit. But in the evaluation process, we thought we should make something more powerful."
Following the stage two launch in June, and a third launch in 2023, the Nuri engine is expected to be test launched another 4 times to ensure stability after which engineers will continue to develop the technology for a next generation space rocket engine.
Lee Eunjin, Arirang News.