1, Qian Xuesen came to California Institute of Technology because there is a top aerodynamic figure in the aviation department of the institute, Professor von Carmen.

He is Hungarian. At that time, he was the first person in this field and was known as "the father of supersonic flight". Qian Xuesen should learn from him, aim at the highest peak of science and technology in the world and learn the most useful knowledge for rejuvenating China.

2. Qian Xuesen 1935 went to study in the United States. After ten years of unremitting efforts, he became a world-class rocket expert at that time.

It is famous for its amazing rocket theory that "a rocket with a speed of 10,000 kilometers per hour has become possible". During World War II, Professor Von Carmen of California Institute of Technology and his mentor participated in the research and development of missile nuclear weapons, the top secret Manhattan project in the United States at that time, and they were one of the few outstanding talents in the United States.

3. For Qian Xuesen, Von Carmen once said: People say that it seems that I discovered Qian Xuesen, but in fact, it was Qian Xuesen who discovered me. People in the American scientific community also generally believe that Qian Xuesen is the most talented rocket expert, the pioneer of the space shuttle and the pioneer of the theoretical research on landing on the moon, and his achievements are not even under the "father of supersonic speed" von Carmen.

Qian Xuesen's main achievements:

1, Applied Mechanics:

Qian Xuesen has done pioneering work in aerodynamics and solid mechanics of applied mechanics. The research on compressible boundary layer carried out in cooperation with von Carmen reveals some temperature changes in this field, and the Carmen-Qian Xuesen method is established. In cooperation with Guo Yonghuai, the concept of upper and lower critical Mach numbers is introduced into transonic flow for the first time.

2, engineering cybernetics:

In the process of its formation, engineering cybernetics focuses on the engineering practice of designing stability and guidance systems. Qian Xuesen himself is the pioneer of this kind of research work.

3, system science:

Qian Xuesen's most important contribution to system science is that he developed systematics and methodology of opening complex giant systems.