■ Korean launch vehicles for on-site technicians Korean launching system talk by on-site engeener

1. Jang Yeong-soon, Han Woo-yeong, head of launching system development department

Space launchers which operate under extreme conditions that travel between cryogenic temperatures, ultra-high temperatures, and ultra-high pressures are among the highest levels of skill in the mechanical industry. Even the most visible processes, such as assembly and welding, repeat challenges and failures, modifications and tests. Korea`s first proprietary Korean launch vehicle is also undergoing several rounds of development. It has heard about the importance of technical difficulties, complexity, and know-how accumulation directly to engineers involved in the development of projectiles.

"Those who develop projectiles will have similar brain structures to adventurers climbing tall buildings with their bare hands or exploring outback."

I met with the Korea Aerospace Research Institute in Yuseong-gu, Daejeon on December 14. He said, "At the moment when the finished projectile is blown through repeated tests and failures for many years, there are only 10 minutes," he also said. "It is the fate of project developers to live with stress and tension for this moment."

Meanwhile, he joined the project team as the project team leader at the time of the launch. On August 25, 2009, the failure of the first launch of the NARO was proved to be one of the two pairings that I had developed (pairing the top of the projectile). It is one of those who knows the difficulty of developing projectiles and the joy of success.

"The biggest difficulty in developing a projectile is that it cannot be reversed once it is set on fire," he said. "The Korean launch vehicle weighs 200 tons at 47 meters in height, 10 times the speed of the car and 280 times faster. He said, "It is natural that it` s hard for me to send a vertical object up into space."

The company is spurring preparations ahead of the test launch of Korean launch vehicles in October next year. It is a test to launch only the part corresponding to the second stage of the rocket ahead of the main launch of the Korean launch vehicle to be made after 2020. Naro launched a launch vehicle in Russia, but the larger Korean launcher is made by hand from start to finish.

He said, "The test launch vehicle launches only two Korean launch vehicles, but the entire system including the 75-ton liquid engine, which is the heart of the launch vehicle, enters in its entirety independently." With the current engineering model, We have finished the meeting, and we will reassemble the same certification model as the flight model early next year. "

The following are the chief presidents and the unanimous answers.

- What is the `development of the system` now?

"It is the role of constructing a single launch vehicle system by combining various components such as the body, the engine, and the propulsion engine. It tests the functioning normally while assembling the components and does the final launch. It contains ~ 300,000 parts. Repeat the process of verifying whether the parts can work as designed in the extreme environment of flying at a speed of 8 km / sec.

- The launch of the test launch vehicle at the end of last year was postponed to 2018. What was the difficulty?

"The typical problem with welding propellant tanks is that they have to be fueled to send rockets far away, but when the fuel tank gets bigger, it gets so heavy that it cannot get far enough. I have to find a perfect harmony between the contradictory conditions: the tank is smooth in appearance, but the lattice structure is the thickest 10mm and the thinner is only 2mm. It is very difficult to have a very thin welded joint in Korea, which is a welding power source, because it builds up several structures, so it is necessary to dispose of it if it is wrong. Not just a matter of welding technology, but a component All this makes difficult the whole process, the process itself that each one develop such a process not easy still ongoing." - What is the atmosphere of the development site?

"Now that the most difficult 75-tonne engine has come to the forefront, I was always worried about how long it would take and how it would be resolved. I cannot be sure of when and where new problems will occur, but if you think it`s perfect, you can launch it, but you cannot be 100% sure of it.


By Nam Do Yeong namdo0@


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