After Hu Wenhai started assembling the parts on the table one by one, Hu Shiwu found that as he said, it was really just a toy.

In principle, this is an authentic turbojet engine. The compressed air ignites the fuel, and then the expanded air is sprayed backward through the impeller - no matter how advanced turbojet engine principles are.

However, this aircraft engine, which is specially developed and used for high-speed aviation aircraft, sounds very high-end, seems to have only the function of toys in Hu Wenhai's hands.

Because it is too "small", the total length is about 25cm, and the net weight may be about 1 kilogram. Hu Shiwu swept it with his eyes and gave such a set of data in his heart.

How much thrust can this micro turbojet engine produce? Two kilograms, or three kilograms? What it can push is just a model aircraft.

Thinking of this, Hu Shiwu couldn't help but laugh. His grandson was indeed a little playful, but his mechanical talent is worthy of being a part of the old Hu family!

No matter how skillful the children in other high school are, they just use monkey rubber bands to make wooden model aircraft. But what about their eldest grandson Hu Wenhai? No matter how simple the turbojet engine is, it is small, if it is someone else's children, they might not even hear it!

High school students build aircraft engines. If this is really done, they will not have to make newspapers, broadcast news, or something? Thinking of this, our Hu family is really going to show their faces now!

"Good grandson, what are you going to do? Grandpa will help you!" Hu Shiwu rolled up his arms and sleeves, staring at the parts in Hu Wenhai's hand with great enthusiasm.

"It just so happens that you really need to help me." Hu Wenhai clapped his hands, stopped the assembly work, pointed to the semi-finished product in front of him and said: "The turbine blades of the compressor need to be balanced, and this depends on your level 8 worker's feel!"

"Movement balance?" Hu Shiwu was stunned and asked in surprise: "I said good grandson, how fast do you want to achieve the engine speed? You actually need to do dynamic balance?"

The so-called dynamic balance refers to structural tremors caused by imbalance in the shape and weight of the blades during the rotation of the turbine compressor blades. This tremor is not a big problem when the speed is low, but if the blade speed is very high, it will lead to unstable operation of the blades.

According to Hu Shiwu's estimate, if the thrust weight ratio is 2 to 3, the blade speed is less than 10,000 revolutions, and dynamic balance is not very meaningful.

Hu Wenhai scratched his head and answered: "The bearing materials of this set of engines are not up to standard. I guess 80,000 rotations should be the limit, right?"

"Eighty thousand revolutions!" Hu Shiwu was shocked after mental calculations. Didn't that mean that the thrust weight ratio is at least 5 to 6? Such an engine with a size of nearly one kilogram can provide about six kilograms of thrust.

If the thrust-weight ratio of the whole aircraft model is 0.5, the aircraft model can weigh 12 kilograms - is this still a model aircraft?

"Hey--Hey--" The iron door at the workshop was pulled open, and an airplane was gently pushed in by two people in the backlight.

Hu Shiwu weighed an exquisite compressor roulette in his hand. The roulette was very well-made. After the stainless steel texture was processed, it was polished and heat treated. It felt quite enjoyable when holding it in his hand.

If you do dynamic balance, you normally need professional testing equipment and calculation formulas. This kind of product development cannot be done in general factories because dynamic balance formulas require senior engineers to design and research and development. Factory products are produced using ready-made formulas and debugged equipment.

But there are also solutions. Was the highest achievement of machining accuracy in the 1980s a CNC machine tool? No, in fact, this crown still belongs to humans.

Especially legendary figures like Hu Shiwu, for other workers, they must rely on machinery and equipment to determine dynamic balance. They only need to use their fingers and ears.

Because to put it bluntly, the so-called dynamic balance means that each blade of the entire roulette is consistent in weight, and the center of gravity is exactly at the center of the circle of the roulette when rotated. Hu Shiwu weighed it with his hand and could determine which side of the roulette is heavy and which side is lighter. Then just use tools to grind off part of the weight of the blade, or correct the curve of the blade, which is simply adept for Hu Shiwu's hands.

Hu Shiwu took action to deal with the dynamic balance of the roulette in his hand, and Hu Hu and Lu Daming pushed a model of an aircraft worth more than one meter and ran into the workshop.

The double-engine double-sided tail variable swept wings, the wing body is integrated, the air intake on both sides is beautiful and slender like a swan's neck - it is said that the excellent aerodynamic layout is first and foremost beautiful. Hu Shiwu thinks that the shape of this model aircraft exudes an indescribable beauty.

It's just such a beautiful aircraft, but the painting really makes people wonder how to complain. The green head and green tail gray paint makes people feel like it is soil and desolate.

"This plane looks familiar, it seems not from our country, right?"

"The US F-14 fighter jet, hehe, has been replaced by our national air force." Hu Wenhai smiled embarrassedly.

"This green head..." Hu Shiwu thought about it, but still couldn't express the adjective behind it.

"**Not rustic, combat power is five!" Hu Wenhai laughed and ran to the side of the F-14 model aircraft, gently lifting the shell of the rear fuselage.

Hu Shiwu was playing with his beard, and there was no way to deal with his eldest grandson. Since he could walk and speak, Hu Wenhai would occasionally make all kinds of unscrupulous words. But if you want to say that this kid is playful, he can't say that he is over 50 years old, Hu Shiwu's eyes always feels that behind Hu Wenhai's playfulness, he always feels a peaceful heart hidden.

Hu Wenhai's "nonsense" is not as simple as other children's "play". Hu Shiwu said that in his "nonsense" performance, he has the meaning of enjoying life in his eyes.

Yes, Hu Wenhai gives people the feeling that he is enjoying and experiencing this kind of playful feeling, rather than knowing the world through play like other children. For him, there seems to be no secret in this world that he needs to know.

This is probably the difference between geniuses and ordinary people. Hu Shiwu smiled proudly and watched Hu Wenhai install the assembled engine inside the F-14 model aircraft.

The shell looks very light, and it should be knocked out from the thin aluminum alloy plate stole from Hu Wenhai's father's 501 factory. In this year, the management of state-owned enterprises' factories was not easy to do. Not to mention the factory director's yamen, it was normal for ordinary workers to produce scraps and go home by order.

There are three landing gears under the fuselage, which seem to be able to be brought into the belly of the machine. In the opened fuselage case, a lot of equipment has been installed at this time. Two sets of nickel-iron batteries are placed in the belly of the machine, connecting the servo motor of the aircraft.

This made the model aircraft seem to have applied a very advanced fly-by-wire flight control system - but that was just an illusion. Three enhanced signal modules and antennas are placed in the head of the F-14 to receive attitude control for each rudder surface.

There is no way, Hu Wenhai also wanted the computer to automatically control the attitude of the plane. But after searching through Xiucheng, he couldn't find a programmable microcomputer chip. Even the old antique 8080 CPUs are rare in China. It is really beyond his ability to rely on electronic tubes to achieve such complex control.

What abilities does Hu Wenhai have?

In the 1980s, when people lacked entertainment, it was almost impossible for people to be otaku. But no matter when and where, humans always had to find fun for themselves. In the 1980s, young people had their own fun and leisure methods. It doesn’t matter if there were no cartoons or American dramas, but the more popular people these days is geek.

Radio, model aircraft modification, electronic circuits, and even kite competitions. If you were born in the 1970s and grew up in the 1980s, having a pair of clever hands is definitely a plus.

But Hu Wenhai is even more different than these amateur geeks. He is the ultimate geek who will come back from the next thirty years later.

Yes, Hu Wenhai is a reborn person. One day after the New Year, he woke up and suddenly found that he had been reborn and returned to the 1970s. If he couldn't do this, wouldn't he let down this beautiful age, a beautiful era and a beautiful sky?

In order to make up for the geek heart that was deeply involved in life in his previous life, Hu Wenhai was deeply involved in the essence of "torture" in this life.

In his previous life, as the son of a family of engineers, he became the chief engineer of Ningbo wafer factory "disguised as a battery factory in a car company" when he was forty. Hu Shiwu, who was already in his 80s at the time, was sad for several years when he chose his career.

But this does not mean that Hu Wenhai has no interest in machinery at all. In fact, influenced by the family environment, he is also very talented in mechanical design.

In the early years, when even Guoke.com was not even available in China, he had already organized a group of fellow players to think about playing various DIY "big toys". For example, the F-14 model aircraft equipped with miniature turbojet engines was the first domestic player. He had designed and made a set of 100% of his own hands. He had long been familiar with the various data of the F-14, and the model aircraft aircraft he made was definitely a high-quality imitation product.

But after finishing it, he didn't have time to play a few times. As his work entered a tense stage, he then solved a series of production problems in the company, and then he was promoted and raised to the peak of his life. In his thirties and forties, he married a beautiful bride who had just graduated from college. The next year, his wife gave birth to a beautiful and lovely daughter for him. After becoming a father, he was even less in the mood to play with those "unprofessional" things.

But in Hu Wenhai's heart, after all, a geek's soul was always burning.

He was reborn, but he didn't pursue much, and he only had one thing in his heart. That is, no matter what, he must "torn" hard for a while in this life!
Chapter completed!