"I needed a circuit diagram to filter the analog video signal and make it more resistant to interference. Hu Wenhai sat in the position of Hong Yijue, and shouted without raising his head.

In the large office of the technical department, it has completely changed at this time. The originally quiet and leisurely technical department is now boiling over. Shen Qianzhe was designated as Hu Wenhai's assistant, and the remaining technical staff members were assigned to the old comrades who came to help one by one.

Some of these people have learned the truth through practice, and some have taught themselves their skills after the founding of the People's Republic of China. Whether it is machining or strong and weak electricity, perhaps their knowledge system is a little old, but the depth of knowledge and the solidity of the foundation made Hu Wenhai quite surprised.

Don't look at their hands, they are thick enough to scrape off two catties of cocoons. But picking up a pencil and drawing is just as accurate and beautiful. It takes less than ten minutes to lower your head and sort out the circuit diagram according to the requirements.

That's right, it's sorted out. Hu Wenhai also did not expect that the accumulation of China's accumulation in the 35 years since the founding of the People's Republic of China and the continuous industrialization of the past 35 years has been so profound.

It is also thanks to these old people who came out of the mountain to find out one document after another in the pile of documents that are full of sweat in the technical department.

"Analog signal filtering?" Bai Shunshu rolled his eyes and asked Liu Tianshui: "I said Lao Liu, when the 7010 project was built, wasn't there a medium frequency analog anti-sidelobe circuit, which filtered the analog signal, right?"

"Oh, yes!" The old man, who had white hair and a pair of tortoiseshell glasses glued with duct tape on his nose, raised his head, thought for a while and nodded, "I remember, the words of Project 7010 should be in the archives of six or eight years." ”

"I know about this, the task issued in March '68, if the information has not been touched, it should be on the file shelf No. 9 in Room 107 on the first floor. The numbers range from 68031533 to 1539, and the left and right are almost the same. ”

"What are you doing in a daze, hurry up and find it!" Bai Shunshu casually knocked on the blind assistant at his hand and drove him to the first floor to find information.

In this way, most of the technologies that Hu Wenhai needs to apply on the simulation machine can find similar designs from the previous projects of the 501 factory, which is really unexpected.

The only thing that makes people feel tricky right now is the power supply and camera system of the immersive camera.

The previous model aircraft used nickel-iron batteries to power the aircraft, and it was barely good to drive the control system and servo motors on the aircraft. However, after changing to a realistic machine, the shortcomings of the low capacity of the nickel-iron battery are unbearable.

Of course, the first thing Hu Wenhai thought of was lithium batteries, but this was still in 1984, not to mention that there are only metal lithium batteries in China and the world. The charging and discharging performance of lithium metal batteries, especially the safety performance, is unacceptable for the simulation machine. As for disposable dry batteries, that's even less to think about. Not to mention the cost of use, the energy density ratio of dry batteries in this era cannot meet the requirements of use.

Who is Hu Wenhai's old employer? It is claimed to be a battery factory disguised as a car company! In terms of battery technology, he has accumulated a lot of knowledge even if he has been familiar with it. Lithium metal batteries have so many problems, but lithium-ion batteries don't! From this, he thought, the earliest lithium-ion battery seems to have been invented by the Japanese in 1992, right? This is a big business that makes money, and it can't be done now, but it can be done in the future!

However, regarding the choice of battery, in the end, it was chosen, and in Si Guxin's complaining eyes, Hu Wenhai still chose a nickel-cadmium battery as the power supply of the simulation machine.

Nickel-cadmium batteries have the characteristics of long service life and large discharge current, but it also has a serious disadvantage, that is, it is expensive. Using nickel-cadmium batteries as power sources, although the safety will be better and the energy density can meet the demand, it will bring a lot of cost increases. Si Guxin, who was counting on the simulation machine to save money, would be happy to hear the news, then hell.

The battery is the most weight-gaining component of the simulation machine after fuel. On the one hand, in order to reduce the thrust-to-weight ratio of the realistic aircraft to the level of the real aircraft, the artificial aircraft has to add much more weight than before. On the other hand, the amount of energy required to operate an aircraft has increased significantly.

But these increases in weight do not mean that it is good to put a piece of iron on the counterweight. Hu Wenhai has always insisted that any increase in weight must be meaningful.

While increasing the total weight of the aircraft, he is also trying to reduce the weight of the various subsystems. For example, the fuel of the simulated aircraft, although the J-7 is a single-engine fighter, but in order to achieve the flight parameters of the engine of the real aircraft, the small turbojet engine of the simulated aircraft must be improved. For example, increasing the number of compressor stages, lengthening the combustion chamber, and increasing the angle of the injector opening to maximize the thrust-to-weight ratio of the engine.

But of course, the improvement of the engine is done by the professional 601 Institute, and Hu Wenhai only needs to ask for it.

However, the resulting increase in fuel consumption must increase the oil storage capacity, which in turn will further cause loss of engine thrust. In order to maintain the aircraft's vigorous flight in the air for an hour, the fuel tank of the mixed fuel was dramatically increased to a capacity of 20 liters.

With 20 liters of fuel adding nearly 16 kilograms, weight reduction became a design challenge.

"I have an idea about the fuel tank. It was Shen Qianzhe who raised her hand to speak, a girl who had just come out of school to work, and said a little timidly: "Why don't you cancel the oil pump and use compressed air to drive the rubber fuel tank to supply oil?"

"Huh?" Hu Wenhai looked at her with some surprise, this sister who was nominally older than himself, but at this time she pointed to the drawings in front of him with a somewhat apprehensive expression and said: "We use compressed air to supply air to the air bearing, we can add an airbag in the frame of the soft fuel tank, before the compressed air enters the engine, first enter the airbag to expand and compress the soft fuel tank to supply oil, so that the fuel supply pump can be saved, right?"

Hu Wenhai's eyes lit up, and after thinking about it, this method is really feasible. If you can remove the overall fuel supply pump of one kilogram and use compressed air to compress the oil supply, you don't have to worry about the problem of oil supply adjustment, because the pressure provided by the compressed air is constant, and you only need to adjust the angle of the fuel injector to increase the fuel supply.

After the removal of the fuel supply pump, the battery power demand is reduced, which is a lot less. The power used by the fuel pump per unit time is not high, but it cannot be sustained and it has to run the whole time. This accumulates a lot more power than servo motors and the like. Without the fuel pump, the mechanics of the engine can be simpler, the total weight of the battery can be reduced, and even more redundant power can be left......

Hu Wenhai was really impressed by Shen Qianzhe now, he didn't expect such a delicate-looking girl to have such a sharp and creative mind.

"Ha, it's really possible, I'll have to call 601 and see what they have to say about it. ”

......

It is said that everyone collects firewood and the flame is high, if Hu Wenhai alone, he may not be able to make a plan for the entire simulation machine in a year. But now this technology is led by a team of dozens of people.

From the airframe and engine team on Director Wang's side of the 601 Institute to the entire system development team on the side of the 501 factory, everyone added up to more than one platoon. When all these people were mobilized, the progress of technical research was suddenly accelerated.

After a month of intense work, with the finalization of the body design and engine design of the 601 Institute, other subsystems of the simulation machine are also in place. At this time, the simulated machine and the toy model aircraft made by Hu Wenhai were completely two products.

Originally, it was just an empty shell, but at this time, it was densely arranged with various equipment. Although the newly designed engine is still made of stainless steel, its complexity is no longer comparable to that of the original. In addition, what airspeedometer, altimeter, level indication and other aircraft instrument functions are also not lacking in this realistic aircraft.

It's just that the nose position where the radar should have been installed is now a very complex antenna system. Here, Hu Wenhai simply took out the six-arm spiral antenna technology that prevailed in later generations in advance.

This six-arm spiral antenna was invented 24 years later by the American Walter Swarts. Later, it was widely used in the field of mobile communications, and it was a helical antenna design scheme with extremely optimized performance.

With this kind of technology, which is at least 20 years ahead, the data transmission subsystem, which was originally the largest obstacle of the simulation machine, has passed so lightly.

In the era of poor antenna performance, in order to transmit the signal far enough, it is necessary to increase the signal strength enough, which in turn brings greater power supply and circuit requirements.

The reason why human-in-the-loop television-guided missiles or bombs are high-tech weapons is that the difficulty lies in signal transmission. Of course, a small enough optical system is also one of the difficulties, but this is not a problem on realistic machines. Because the space inside the camera is large enough, let alone a disassembled camera system, even if you put a TV camera in it, there is no problem. The simulation machine designed by Hu Wenhai still uses a high-grade camera tube imported from Japan, which not only has better imaging quality, but also is small enough.

Five sets of six-arm spiral antennas are used to transmit and receive information from various subsystems of the simulation machine, occupying a full 40MHz of analog bandwidth. Twenty years after the explosion of electromagnetic signals, this is simply an unimaginable luxury. But who let this be the 80s, everything that flies in the sky is under the control of the military, even the invisible electromagnetic waves.

The summer vacation of Hu Wenhai's sophomore year of high school passed unconsciously in such a busy situation. It wasn't until the last week of August that suddenly there was a roar of cheers in the 501 factory.