144 years ago today, on May 11th, 1881 (April 14th, 1881 in the lunar calendar), von Karman, a famous American engineering mechanist, was born. May 11th, 1881 is the birth anniversary of Carmen (1881-1963), a famous American engineering mechanic. Carmen was born in Budapest, Hungary. His greatest contribution to mankind is to pioneer the application of mathematics and mechanics in aviation, aerospace and other engineering technology fields, which laid the foundation for the development of modern mechanics. Some of the most brilliant theories and concepts in aeronautics and astronautics are named after him. In 1911, Karman conducted an in-depth study of the two rows of periodic vortices left by the flowing fluid behind the cylinder, and theoretically made an incisive analysis of this vortex. This is the famous Carmen Vortex. Carmen founded the American Academy of Aeronautical Sciences and built this college into the research center and training base of fluid mechanics at that time. Von Karman cultivated a large number of outstanding talents. His students spread across five continents, and people called it "Kamenko Class". Among them are scientists and engineers who today shoulder the leadership of outer space technology all over the world. Carmen supported his students' research on rocket propulsion technology and proved for the first time with Malina that a solid rocket motor with stable and lasting combustion could be designed. Carmen has had a greater impact on human life today than any contemporary scientist or engineer. It is the links he carefully created that organically connect the scientific achievements of mankind in conquering the sky into a long chain. Thanks to his efforts, jets with a speed of 3,000 kilometers per hour, missiles with a range of 1,200 kilometers and interstellar rockets have become today's reality.