During the epidemic, you staying at home

　　What are you busy with? What are the gains?

　　Is to unlock some new skills

　　I still grew 15 catties of meat silently

　　In Nanjing, there is a freshman boy

　　Choose during this special period

　　The homemade rocket was successfully launched and recovered

　　After the video he recorded went viral online

　　Many netizens sigh

　　"The future can be expected"

　　"Too strong, this is the back wave"

　　In the video

　　One with a transparent body

　　Cool-looking rocket

　　Standing in a clearing waiting to be launched

　　Countdown starts

　　3

　　2

　　1

　　emission

　　Engine ignition

　　The rocket lifted off with tail smoke

　　"Surprise" and "wow" from netizens

　　As the barrage on the video scrolls

　　Keep passing out

　　Then the rocket fell

　　The parachute opened successfully

　　The rocket landed smoothly and was recovered

　　The video fully shows

　　A rocket from its own design

　　To fluid simulation and manufacturing

　　Test and control

　　And finally the whole process of launch and recovery

　　The story behind the rocket

　　Recently, this video titled "It took half a year to make a vector nozzle TVC attitude control parachute recovery solid rocket (successful launch-recovery)" on the Internet.

　　In less than a day, the video has reached 416,000 views, and currently has more than one million views and more than 6,000 barrage messages.

　　The author of this video and the designer of the rocket is named Liu Shang. He studied aerospace engineering at the School of Aerospace Engineering of Nanjing University of Aeronautics and Astronautics and just finished all the freshman courses.

　　All the steps in the video are completed by him independently, and the amount of professional knowledge involved has made netizens shout "Professional God!"

　　On October 19, 2019, Liu Shang released the first related video "Small Vector Nozzle Posture Self-stabilizing Solid Rocket" on the Internet, showing the production process of a model rocket that is the prototype of a solid rocket.

　　Liu Shang introduced that this rocket was originally intended to be a simple model, so he did not consider various practical factors in the design. However, as the model was gradually completed, it was possible to use a solid rocket motor to make this model fly. idea.

　　In the comment area of ​​the video, Liu Shang wrote: "I will continue to do this project. It is a process full of difficulties and challenges, and it is also a long-term process. It requires me to continue to learn and continue to go. Explore and keep trying, but as long as I keep going, I might succeed someday."

　　Maintaining this determination, in more than half a year, through self-study and communication with enthusiasts, Liu Shang lit up the "skill tree" of mechanical design, 3D modeling, engine, fuel, programming, flight control algorithm, and 3D printing. "The successful launch of the rocket was finally realized.

　　Some videos posted by Liu Shang on the Internet.

　　"Model Rocket Launch", "Small Rocket TVC Thrust Vector Controller", "Solid Rocket Motor Ground Interview Vehicle Failure", "The seventh test of self-made carbon fiber solid rocket motor was a complete success"... 37 videos on the Internet, recording Liu Shang The development process step by step.

　　"It took half a year to do it step by step. It is very fulfilling to see the successful launch of the rocket, but I still think more about how to improve." Liu Shang said that he likes to use the camera to photograph the process and record his step by step. Overcoming difficulties is not easy.

　　Showcase of rocket development process. Photo courtesy of respondents

　　In the development, the part of the vector engine takes the longest time. In the past four months, Liu Shang has experienced several failures.

　　The first major problem is the design of the vector nozzle of the engine. Liu Shang, who has insufficient knowledge in this area, referred to many books. After the design was completed, he and his friends completed the fluid simulation of the thrust vector. The final simulation results were in good agreement with the experiment.

　　"The other is the fuel issue. I don't know enough about fuel." Liu Shang said. The development process requires a large number of experiments to verify and improve, and the safety of rocket fuel is the top priority, and no mistakes are allowed. "Although it is dangerous, it is all controllable. During the test, we will find a place where no one is there, find a shelter in advance, prepare a fire extinguisher, and remotely ignite."

　　Engine test. Photo courtesy of respondents

　　In the engine test in June, Liu Shang failed twice in succession. During the test, the vector control system has been formed, and components such as vector nozzles and high-speed steering gear are installed on the engine, which is costly. The two failures cost Liu Shang thousands of dollars, and it also dealt a big blow to him.

　　After some adjustments, he kept discussing with the fuel experts among his partners, and finally solved the problem by adjusting the formula and freezing the fuel surface.

　　Each module of the rocket. Photo courtesy of respondents

　　"This rocket has not yet reached the highest performance." Liu Shang said that through the sensors and positioning modules installed on the rocket, he collected various data from this flight and will continue to improve the program algorithm.

　　"My ultimate goal is to use a rocket to deliver the courier," Liu Shang said. The rocket "courier" loaded with the cargo will accurately shoot to the destination and safely and softly land with the decelerated engine after arrival.

　　To this end, Liu Shang determined a three-step R&D strategy: "attitude control, flight trajectory control, fixed-point soft landing."

　　As early as in junior high school, Liu Shang had already launched self-made rockets and used self-made drones for aerial photography. In the eyes of his friends, he is "not very talkative", and he can always talk about his works.

　　Liu Shang's room. Photo courtesy of respondents

　　Thanks to the strong support of his parents, Liu Shang was able to devote more energy to his interests.

　　On weekdays, the books that Liu Shang reads are all professional books he collected. His room is also full of equipment and tools for making models. Liu Shang himself feels "a little bit crazy."

　　"Different from the "painting style" of other freshmen’s WeChat Moments, his Moments recorded every step of his growth on the path of aerospace.” Liu Shangyou's undergraduate tutor and vice dean of the School of Astronautics Zhu Xudong told Liu Shangyou deep impression. Zhu Xudong said. "After learning about his enthusiasm for aerospace science and innovation, the college contacted professors in related fields to give him guidance on science and innovation."

　　In 2014, Liu Shang, who was still in junior high school, wrote: "I think the things that attract me most are model aircraft, rockets, and chemistry."

　　For 7 years, he has been insisting on his love. "My interest seems to have no origin, and my pursuit has been uninterrupted. I hope to turn my love into a career in the future."

　Netizens say so

　　@ Monkey boss

　　As a classmate and netizen, I have witnessed the production process since last year. The original prototype was completed on National Day last year, and it is not easy to successfully launch it step by step.

　　The R&D workload is huge, and I was fortunate to help a little bit and participate in it. I know the whole research process is not easy. Through long-term research and study, the successful launch in the last few days is of extraordinary significance.

　　@我们的空间

　　The future can be expected, the future can be expected.

　　@isolation小强

　　Big brother's freshman

　　@动物人的世界

　　This can't be called "back waves", this is a tsunami!

　　Author: Zhang Zi slightly Nizi Han Xu Shanshan