The guidance device section will be led by Teacher Lu, so Wu Tong does not need to spend time and energy to learn it from scratch. Wu Tong will start with the important section, the air-to-air missile engine.

After absorbing a large amount of missile knowledge, Wu Tong gained a deeper understanding of air-to-air missiles.

Unlike aircraft engines, which operate continuously, the engine operating time of air-to-air missiles is very short, which is mainly determined by the size of the missile. In theory, increasing the size of the missile can increase the engine operating time and range.

It is just limited by the characteristics of air-to-air missiles. After reaching a certain size, the attack efficiency decreases. The AIM54, the Phoenix missile, once the king of American air-to-air missiles, was retired along with the F14 precisely because of its large size.

Therefore, it is not advisable to simply pursue enlargement of volume and increase of engine working time. After all, the load of fighter jets must also be taken into consideration.

According to the information Wu Tong had learned, the engines of most air-to-air missiles only operated for about 10 seconds. Only the Seacat, a British air-to-air missile with a range of 5.5 kilometers, had an engine operating time of 35 seconds.

The engine operating time of most medium-range ballistic missiles, such as the AIM120 of the United States, is only 17 seconds.

The air-to-air missile with the longest working time at present is expected to be the Meteor missile that France began producing this year. According to reference materials in the top-secret database, the engine is expected to work for up to 60 seconds.

If this expectation can be achieved, Meteor will be an alternative in the air-to-air missile series!

Of course, this does not mean that Meteor can become the most powerful air-to-air missile in the world.

China's missile research and development process has also been full of difficulties. From learning from the Soviet Union and the United States in the beginning, and from purchasing physical objects to independent research and development, China has gone through three years of hardship. In order to put the air-to-air missile into service as soon as possible, it used 22 tons of soybeans and only got back one kilogram of drawings, exchanging much-needed product information from abroad.

In order to pay this heavy price and meet the expectation of the Chinese people to tighten their belts, countless aviation research pioneers worked tirelessly to overcome difficulties such as weak foundation and lack of means, learned technology from them, and made a difficult start, from surveying and mapping imitation, to self-design, and then to independent innovation and development. This is the foundation laid by countless scientific researchers.

Air-to-air missiles, from the grandfather's PL-1/PL-2, to the first domestically produced semi-active radar-guided missile officially finalized and put into service, the PL-11, and further, the PL-12, which is now the main force of the People's Liberation Army's defense, the new PL-13, and the scientific researchers are still making continuous progress and working hard to develop the finalized PL-14, and in her hands, at the request of President Hua, the preliminary research of the PL-15 has begun.

Perseverance and self-improvement have always been the fine qualities of the Chinese people. The generation in service, the generation in research, and the generation in pre-research are China's full preparation.

The most important requirements for air-to-air missiles are that they exceed fighter aircraft in maneuverability overload and speed. Most high-quality air-to-air missiles have speeds above Mach 4, and some even reach Mach 5, 6, and even Mach 7, which is comparable to the speed of typical intercontinental cruise missiles.

Domestic air-to-air missiles have not yet reached the top level. The PL-13 currently in service has a speed between Mach 4 and 5, reaching the level of excellent air-to-air missiles, but there is still room for improvement.

Wu Tong studied the detailed information of PL-13, and found that the engine it used was still a traditional ramjet engine.

Compared with other air jet engines, ramjet engines are characterized by simple structure, small mass, high efficiency and good economy when flying at high speeds above Ma=2.5.

However, its economy deteriorates at low speeds, and when the flight speed reaches zero, it has no static thrust. It also has poor compatibility with other missile systems, such as the warhead and guidance system.

Wu Tong began to sketch, stroke by stroke, outlining the current composition of the domestic ramjet engine and marking out detailed data. Based on this data, Wu Tong began to transform the mathematical model and conduct directional deduction.

Simple structure, light weight, high thrust-to-weight ratio, low production cost, these advantages suitable for a large number of equipment need to be retained. On this basis, kinetic energy should be improved.

Wu Tong kept deducing and perfecting her mathematical model, trying different data and direction deductions, and using absolute direction judgment to deduce the optimal improvement direction and optimal parameters, and then slowly perfected her engine improvement plan.

The filling of a massive knowledge base has given Wu Tong sufficient foundation for absolute direction judgment in the field of missile science. The absolute deduction ability has been extended. Sparks of thought collide in her mind, deducing detailed structures, and simulating actual performance in her mind, converting them into parameters, filling Wu Tong's design model.

Wu Tong was completely immersed in it. After telling An Wenshu, who was responsible for protecting her, she went into seclusion in the dormitory, eating, sleeping, washing up, studying, resting to recover her energy, and then deducing. The model of the new air-to-air missile engine was gradually filled in and improved in Wu Tong's deduction, moving towards its implementation.

She conducted preliminary research and simulation based on a range of at least 200 kilometers and a speed of at least Mach 6. This is a watershed hurdle. Only by reaching this data can she be qualified to touch the world's top-notch air-to-air missiles.

If you do something, do it to the best of your ability. This is Wu Tong's insistence. Super power, super speed, and super combat power, she strives to achieve the ultimate in everything she can, to build a true national weapon for China, and live up to the trust entrusted to her by President Hua from so far away.

Research and understanding of Wu Tong shows that once Wu Tong enters this special Wu state of immersion and oblivion, great success will occur.

When Wu Tong was completely immersed in an outburst of inspiration and in complete seclusion, the security force was infinitely superimposed with her dormitory as the center. In addition to An Wenshu delivering meals to Wu Tong's dormitory on time, she would deliver nutritious meals without looking away and then take out the tableware... The logistics work was completed by a dedicated person, and she was responsible for the entry and exit.

No one else is allowed to approach Wu Tong's dormitory and disturb Wu Tong's research. Comrades from the security department work in shifts day and night and have made sufficient security preparations.

The cold air grew heavier day by day, leaves were falling everywhere, and it seemed that in the blink of an eye, autumn had passed and winter had arrived. The cold wind was howling, and frost began to condense on the branches. The Kyoto University campus had turned from the splendor of autumn to the slightly bleak scene of winter.

Wu Tong sat by the window, the gentle warmth of the winter sun casting a shadow over her, a lingering glow. Her eyes reflected the engine model on the table, meticulously deduced and drawn, stroke by stroke. Its complex data, its precise structural design, all signaled the remarkable achievements of the past twenty days.

Her hands were still deducing, and she had already reached the optimal engine design based on the knowledge she had at present. She wanted to give it a boost, equip it with fuel with better performance, and further add wings to it to fly.