On a piece of saline-alkali land in Lizhuang, Soahu, Huimin County, Wuding Prefecture, Shandong, a group of soldiers of the National Defense Army surrounded this place three months ago, and a high wall surrounded this piece of saline-alkali land with a radius of more than 800 acres. However, the government did not bully the common people, and compensated according to the price of fertile land, and no matter where the land was sold for cultivation, the national tax on imperial grain for no five years was exempted. Waiting for the compensation of Zhongyuan and the certificate of land selection, it can be regarded as steady, involving the relocation of the three villages without a little hindrance, even the family graves of several villagers are also moved by themselves, in the words of the villagers, "The officials and masters are kind to others, we don't dare to learn the virtue of the people, isn't it just to ask the ancestors to move to a beautiful house?" Such a good thing, I'm afraid that the ancestors will also slap in favor, and what kind of chaos will it add to the government. "With the support of the simple villagers, a temporary road and 800 acres of land and the surrounding 200 acres of warning ring were taken down within a month.

Because field airfields and permanent airfields of the Navy and standard air forces were being built in various coastal areas, Wudingfu, a small national defense project belonging to China's inner defense circle, did not receive the attention of the spies, and this situation lasted for more than 10 years, until a space city was erected on the tidal flats of the Yellow River in Wudingfu, and all countries were stunned to discover that China's space industry was actually developed under everyone's noses.

This small site of less than 1,000 acres is certainly not the future space city, but it is undeniable that it is this desolate land that still has the remains of cotton stubble that China's aerospace has taken its first step. A sounding rocket is a special type of delivery vehicle, which only carries scientific instruments for suborbital flight. Sounding rockets are generally uncontrolled rockets, which have the advantages of simple structure, low cost and convenient launch. It is more suitable for temporary observation of special natural phenomena that occur in a short period of time, such as auroras, solar eclipses, solar eruptions, etc., and continuous observation of certain natural phenomena that change with time and place, such as weather. However, the only purpose of the small rocket with a diameter of less than 50 centimeters that is about to take off at this improvised launch site is to verify the rocket propellant and test the aerodynamic shape, simply put, to put a large drill monkey to see how much work needs to be done to break away from gravity in the future.

Sounding rockets are rockets that carry out exploration and scientific experiments in near-Earth space. Sounding rockets can be used to detect the structural components and parameters of various layers of the atmosphere in the altitude direction, and study various solar-terrestrial physical phenomena such as the ionosphere, geomagnetic field cosmic rays, solar ultraviolet and X-rays, meteorites, etc. The sounding rocket flies higher than the sounding balloon and lower than the artificial earth satellite operating in low orbit, and is an effective detection tool at an altitude of 30~200 kilometers. Moreover, with a guidance system and a sounding rocket that has changed its flight trajectory, it will become a ballistic missile with great power in the future, and this is also a key direction for the future development of equipment of the Chinese army, so no matter from that point of view, Wu Chenxuan, who is familiar with the military importance of missiles in the future, will vigorously develop the research work on rockets.

Even if it is a simple sounding rocket, the data obtained can be used for weather forecasting, earth and astrophysical research, and provide the necessary environmental parameters for the development of ballistic missiles, launch vehicles, artificial satellites, manned spacecraft and other aircraft. Sounding rockets can also be used for experimental research on some special problems, such as using the weightless state provided by sounding rockets to study the changes and adaptability of biological bodies, and using sounding rockets to carry out verification tests of new technologies and instruments and equipment. There are some special technical requirements for launching an uncontrolled rocket, the main ones are: ensuring flight stability, reaching a predetermined detection altitude and reducing the dispersion of ballistic apex and landing points. The first rocket specially used for high-altitude atmospheric exploration in later generations was the "Female Corporal Rocket" successfully developed by the United States in the autumn of 1945. It is capable of delivering 11 kg of payload to an altitude of 70 km. After that, the United States and the Soviet Union launched a batch of sounding rockets using captured V-2 rockets. The International Geophysical Year of the 50s gave a great impetus to the development of sounding rockets, and many countries began to develop sounding rockets. By the 80s, sounding rockets were developed or used in more than 20 countries of the world. The annual launch of sounding rockets is up to several thousand.

A sounding rocket system consists of a payload, a rocket, a launcher, and a ground station. The payload is mostly housed in the instrument compartment of the arrow. The diameter of the instrument chamber can sometimes be larger than the diameter of the rocket body. The information collected by the payload is sent to the ground station through the telemetry device for receiving and processing, or the payload is ejected from the rocket during the descent of the rocket, and the parachute and other pneumatic deceleration devices are used to safely land on the ground for recovery. The weight and size of the payload depends on the detection requirements and can range from a few kilograms to several hundred kilograms and up to several tons. The rocket includes the rocket body structure, power plant, stabilized tail, etc. Most sounding rockets are single-stage or two-stage rockets, and some are three-stage or four-stage rockets. The power plant is usually a solid rocket engine, which simplifies and shortens the launch operation time. The requirements for the attitude and flight trajectory of the sounding rocket are not as strict as those of missiles and launch vehicles, and there is generally no control system, and the flight stability is only ensured by stabilizing the tail or the rotation of the rocket around the longitudinal axis. The control system is set up only when precise positioning and orientation are required. The launch device usually uses rails and tower launchers, so that the rocket can obtain a sufficiently large exit speed. In order to ensure that the predetermined altitude is reached and the ballistic dispersion is reduced, the launch angle of the sounding rocket needs to be adjusted and determined by wind compensation technology according to the high-altitude wind data of the launch site. Most sounding rockets are launched from the ground in a near-vertical state (i.e., a tower), but also from a mobile launch vehicle and, if required, from a ship or from a balloon lifted into the air. Ground stations mainly include ground receiving equipment for receiving measurement information, positioning and velocity measurement equipment (such as radar) and electronic computers for tracking rockets. There are two types of radar tracking methods: reflective and reactive, and the reponder has a larger tracking distance than the reflective type. The telemetry data received by the ground receiving equipment is directly input into the electronic computer for processing, and the detection results are given in real time.

In the late autumn of the 13th year of the Republic of China, the shooting range of Lizhuang in Soahu was brightly lit day and night, and the teachers and students of the School of Industry of Shandong University were nervously preparing for the launch of the "Shanda series" rockets. On October 8, the two-stage solid high-altitude exploration rocket codenamed "Shanda-1" stood vertically at the launch site, and at two o'clock in the afternoon, everything was ready. As the operator pressed the button, the first stage of the rocket immediately ignited, took off, with a loud rumbling sound and a large amount of smoke and dust, the rocket dragged several meters long tongue of fire, with a bright red tail, like an oriental dragon soaring into the sky, disappearing into the sky. A few minutes later, the "boom" sound of the second-stage rocket landing was heard in the distance of the shooting range, and the entire launch process showed that the rocket system was flying normally and meeting the design requirements. This successful launch announced to the world that China had developed the world's first sounding rocket. The news of the successful launch of the two-stage solid sounding rocket "Shanda-1" was spread, but the international response was not enthusiastic, and in the eyes of the major powers, this kind of large-sized fireworks is not as important as making the main gun caliber of the capital ship 5 centimeters larger.

At 4 p.m. on the same day, the researchers launched a second second-stage rocket and won again. The two two-stage sounding rockets were successfully launched by teachers and students from the School of Industry of Shandong University, thus opening the prelude to the Chinese people's march towards the space era.

It is no accident that the School of Technology of Shandong University undertakes this important task, under the care of Mrs. Wang Yunning, the School of Technology of Shandong University has introduced a large number of physics, chemistry, mathematics and other basic disciplines from the world, Nicholas Tesla is often in the research of Wang Yunning Research Center, to give lectures at the School of Engineering of Shandong University, those exiled scholars in Russia are also long-term employees of Wang Yunning Research Center, there is no way to refuse the invitation of the hostess to let them give lectures at Shandong University, plus the return of Chinese scholars studying in Europe and the United States, The School of Engineering, the School of Chemistry, the School of Medicine, the School of Materials and other science colleges have made great progress. Inspired by the emancipation of the mind, the encouragement of innovation and the "Second Five-Year Plan for the Development of National Scientific Research", the teachers and students of the School of Engineering of Shandong University are determined to climb the peak of new technologies. First, they plan to develop a two-stage solid high-altitude detection rocket capable of delivering a 25-kilogram payload to an altitude of 100 kilometers for meteorological or upper-air exploration. On the one hand, they are doing so to be able to contribute to the development of sophisticated weapons for the country, and on the other hand, to be able to better build up the missile specialty, enrich the theoretical and practical level of teachers and students, and master the basic knowledge of missile design. Relying on the professional advantages of the physics major and the mechanical major of the College of Engineering and the artillery shell major (involving internal and external ballistics and flight theory) and gunpowder major (involving solid propellant theory) of the Zaolin Military College, there is a foundation for the successful trial production of solid rocket fuel. As a major missile project, the "Shanda series" two-stage solid high-altitude detection rocket was developed with the code name "991", which means that even if it fails 99 times, it must pursue the success of that time, so it is also called "991 sounding rocket".

In this cheering crowd, there is a Jiangxi boy with eyes who does not attract attention, but his future achievements will be the first peak of Chinese physics, and his disciples Yang Ning and Li Zundao are the two giants of Chinese physics, he is Wu Youxun, a doctoral student from Gao'an, Jiangxi, this year is also his last year of study at Shandong University, next year he will go to the University of Chicago in the United States to engage in physics research with Professor Compton, until six years later he received a double doctorate degree from the University of Chicago and Shandong University. It was during this time that he was involved in X-ray scattering research under the leadership of Professor Compton, and achieved a series of results that made him famous in the international physics community.

However, all this is still in the distant future, and thousands of miles away in Bangkok, the city of ten thousand Buddhas, the Sino-Japanese peace talks have once again reached a tepid stalemate, but the joint communiqués frequently issued by the two sides have made all countries in the world believe that China and Japan will live in peace, at least in the direction of peace, but whether it is the national defense force or Japan's military department, it is loose on the outside and tight on the inside, and China and Japan, the two great powers in the Far East who have become great powers, will finally fight each other in what way? Perhaps only the Wu official who was exercising by the Pearl Spring in the morning could tell people the answer.