The change in the battle situation was too unexpected, most of the materials prepared by Wang Hanzhang were not used there, I originally thought that there would be at least one big war, but I didn't expect that there would be no big war, and then there was a terrible plague, fortunately the retreat was timely, otherwise the consequences would be unimaginable.

If you want to attack Vietnam, but it is separated by a huge plague zone, and if you attack from northern Laos, you will not only have to cross the Lancang River, but also fight the Japanese army in the mountains and mountains of Laos, which is very difficult, and the Qin army is not familiar with the terrain, it is easy to get lost, and it is not suitable for large-scale army attacks, so there is no way to replenish.

As for the Malay Peninsula, it is indeed difficult to attack, it is too narrow, after the Japanese army shrinks its forces, it forms a three-in-one operation of the navy, land and air force, and even if the Qin State relies on the air force and army alone to win it in the end, the loss is not something that Wang Hanzhang can bear. Attacking other places, Wang Hanzhang was not ready, so he could only temporarily turn to the defensive.

And at this time, the good news came, with the joint efforts of Qin's scientific and technical personnel and German science and technology, the two sides have cooperated for a month, on the basis of the previous research results of Qin's scientific and technical personnel, P51 has been thoroughly understood, and the drawings of the core technology engine have been completely drawn, and they are starting to build the first engine, but the German technicians have also synthesized a little bit of what they know, and made some improvements, which will be more suitable for the national conditions of Qin.

Qin's industrial foundation is almost zero, especially in the machinery manufacturing industry, so although this kind of engine in the United States is good, but Qin may not be able to produce energy, no matter how good a thing is, especially for war, if it can't be mass-produced, then it should be given up.

At the same time, Wang Hanzhang also asked them to make an engine that can be installed on a tank on this basis, and Wang Hanzhang estimated that it should be similar to make some things smaller.

At present, the helicopter has not been solved except for the engine, and there are no other big problems, so Wang Hanzhang also gave Qin Guo's technicians a secret task, that is, to design the engine of the helicopter, if the engine of the fighter is used, it seems to be a bit big, so it is necessary to design a smaller engine.

After having the engine, Wang Hanzhang's helicopter can really fight, but there are no small missiles on it, only machine guns, and Wang Hanzhang does not have missile guidance technology.

Wang Hanzhang has high hopes for helicopters, and the outstanding characteristics of helicopters are that they can do maneuvering flights at low altitude (several meters above the ground), low speed (starting from hovering), and the direction of the nose does not change, especially it can take off and land vertically in a small area. Because of these characteristics, it has a wide range of uses and development prospects. In the military aspect, it has been widely used in ground attack, airborne landing, weapons delivery, logistics support, battlefield rescue, reconnaissance and patrol, command and control, communication and liaison, anti-submarine mine clearance, electronic countermeasures, etc. In civil use, it is used in short-distance transportation, medical rescue, disaster relief and life-saving, emergency rescue, hoisting equipment, geological exploration, forest protection and fire fighting, aerial photography, etc. The transportation of personnel and materials between offshore oil wells and bases is an important aspect of civilian use.

Its disadvantages are that helicopters have higher vibration and noise than airplanes, a large amount of maintenance and overhaul work, higher use costs, lower speeds, and shorter ranges.

Helicopter has many other aircraft difficult to do or impossible to do the advantage, widely used, helicopter because it can take off and land vertically without a large area of the airport is mainly used for sightseeing, fire rescue, maritime first aid, anti-smuggling and anti-narcotics, fire fighting, commercial transportation, medical assistance, communications and spraying pesticides and insecticides to eliminate pests, detection of resources, and other sectors of the national economy. The ranks of the world's helicopters are growing.

However, the current helicopter structure is very simple, far inferior to those planes of later generations, so although there were helicopters before World War II, no one saw his broad prospects, at least not those in power, otherwise those tanks of World War II would not be so arrogant.

Wang Hanzhang once read the introduction of helicopters on Baidu, and accidentally saw Zhu Jiaren, the father of Chinese helicopters, and the helicopter he developed was at the world's advanced level at that time, because it was the 40s of the 20th century, and the actual research and development of helicopters was in this period, and Zhu Jiaren's helicopter research can be said to be on the same starting line as the world.

During the Anti-Japanese War, the Central Academy of Aeronautics and Astronautics carried out limited theoretical research on helicopters. In 1944, the Tsinghua Institute of Aeronautics was engaged in the research of helicopters in Kunming, the rear of the country, and published papers. What is even more shocking is that almost at the same time as the American R-4, China began to design and manufacture helicopters. In 1944, Mr. Zhu Jiaren, a pioneer in China's aircraft industry, designed China's first helicopter. In the autumn of 1945, the "Hummingbird A single-seat helicopter" was successfully developed, and a coaxial twin-rotor helicopter was born! This is the first helicopter developed by China itself, and Zhu Jiaren is also known as the "father of China's helicopters". In July 1948, the "Hummingbird" B helicopter was successfully developed, the engine power of this helicopter is 91.7 kilowatts, the rotor diameter is 7.62 meters, the height is 2.63 meters, the total weight is 725.5 kilograms, the maximum flight speed is 136 kilometers per hour, and the range is 219 kilometers. It adopts a closed cockpit, which even surpasses similar helicopters in the world. But due to the civil war, the whereabouts of the hummingbird helicopter are unknown.

This year is 1943, the reason why Zhu Jiaren in history built a helicopter at that time was because of the difficult Anti-Japanese War, and no one supported it, so Wang Hanzhang naturally would not let such a baby go. No one can see the prospect of a helicopter, but Wang Hanzhang is very clear, so history is cheap Wang Hanzhang.

At this time, although Zhu Jiaren had a certain identity and status, no one knew him, so when Wang Hanzhang sent someone to find him, the price he offered, especially to fully support any of his scientific research, asked for money for money, and asked for people to give people, this guy came to Qin State without saying a word.

Zhu Jiaren has a concept, although it is not advanced, but for Wang Hanzhang, he has a good foundation, and Wang Hanzhang according to the use of helicopters and various concepts in later generations, a little bit of Zhu Jiaren, he will immediately understand, so the development of the helicopter in Qin is so smooth.

And now there should be no big problem with the power problem, Wang Hanzhang attaches great importance to the development of helicopters, as soon as the war in Thailand stops, the matter of preventing the plague is handed over to the people below, Wang Hanzhang is now staying with Zhu Jiaren every day.

With the previous design and concept, and the model was made of wood, the appearance of the helicopter in later generations was simulated, don't underestimate the appearance, at least the missiles are hanging there, where the machine gun is installed, these are nothing in the later generations, but for the helicopter just started in this era, these are innovations, these are technologies, and Wang Hanzhang immediately made Zhu Jiaren clearly understand the wide range of uses of helicopters, and his goals are clear, and he is naturally more confident.

People are most worried about not knowing whether their efforts will be rewarded, if they know exactly what the consequences of their efforts will be, then for this person will be the most motivated.

The shape of the helicopter has been basically solved, as long as it is slightly improved, but the core technology engine of the helicopter has not been implemented, how big the engine is, how much horsepower is not noted, and there are still many things to run in to really build a practical helicopter.