Turn on your laptop.

Zhang Nan first searched for some information on the Internet and learned about the principle of power.

Although Blue Star is gone, there is a disaster preparedness database in the Ministry of Science and Industry that stores 100PB of data. Among these massive data, there are countless valuable data, which makes the Development Bureau still not lose the "easy to obtain" characteristics of the knowledge explosion era.

The smart and promising teenagers in Zhangnan Farm, such as Prit, not only had the opportunity to go to the central city of Kaikai District to study, but they usually had to download learning materials and teaching videos, so they had to trouble Zhang Nan a lot. Judging from their eagerness to study and work hard, Zhang Nan did not refuse to help.

Continue to search for information.

internal combustion engine.

Rocket engine.

Compressed aerodynamics.

Turbojet power.

……etc

In fact, when Zhang Nan saw the working principle of the internal combustion engine, he had a general idea in his mind.

That is the expansion-compression effect.

Any substance will expand when heated, such as air, water, liquid nitrogen, etc., and will expand after heating, resulting in an increase in pressure.

This increased pressure can drive the piston to move and do work to the outside.

During the external work, it can be used to inhale and compress air like an air pump, and then continuously press the air into the cylinder.

Wait until the pressure inside the cylinder is large enough, then open the pressure relief valve and air is sprayed out at high speed.

The power generated is less than dozens of kilograms.

It is entirely possible to take people up to the sky.

As shown in a certain animation, using compressed nitrogen as power, people can actually fly in the sky.

Then, Zhang Nan, who has tens of thousands of units of light energy reserves, can definitely fly to the sky by using the principle of heat expansion and compression and high-pressure jets, and the endurance will not be short.

but……

Equipment like compression cylinders and high-pressure gas storage tanks with certain industrial thresholds cannot be handled by Zhang Nan's half-baked level.

In the entire D9 development zone, only Yang Mengchao's hardware factory has large machine tools and good industrial processing capabilities.

...

May 10.

Zhang Nan took some time to drive to "Mengchao Hardware Factory".

“You want to make a ‘high-pressure jet flight backpack’?”

After looking at the design drawings on the drawings, Yang Mengchao was a little surprised and looked at Zhang Nan and said, "You are so idle that you have nothing to do. What do you do when you suddenly study this thing?"

“Amateur hobbies.”

Zhang Nan said: "Instructor, you know that I like wonderful ideas. Once I have a brain, I can't stop. For example, the last nuclear fusion water boiler was not built and I didn't stop. This time I was an old problem again."

"You also know that this is a problem. You, a farmer, can you handle nuclear fusion there? After working hard for more than half a year, you have created a water boiler. Are you unable to do anything there? You have given up?"

"No, boiling water can still be boiled a little, sometimes it can be burned a lot of tons."

Zhang Nan said that Yang Mengchao has been staying in his hardware factory and has never been to Zhang Nan Farm. Otherwise, he would not even be able to close his mouth when he saw the nuclear fusion water boiler working.

"Zhang Nan, give up your boring imagination. The rationality is not as good as that of civil science. Everyone has to be busy with their business. My factory has received a lot of production tasks. I really don't have time to accompany you to do these things."

"Instructor, it's just a little time for you. Moreover, this thing is much smaller than the last water boiler, and it takes at most one or two days."

Zhang Nan played the emotional card: "I am Xiao Xinghai's godfather. I gave him many toys. Think about the vegetables and fruits in winter. Recently, I heard that my sister-in-law is pregnant again, so today I sent half of the truckload of fresh ingredients. That half of the pig was just killed in the morning..."

"Instructor, are you really not helping with this little effort?"

"you--"

Yang Mengchao glared at him and shook his head and said, "I can't stand you, okay, okay, I'll help you!"

"Thank you, instructor!"

...

Yang Mengchao drew three technical backbones from his factory, and added himself to form a four-person team.

High-pressure cylinders are easy to handle, and they are available in the factory. Use two suitable sizes to modify them.

Small compression cylinders are more difficult to make and are the most technically compatible part.

It has to withstand high temperatures of at least thousands of degrees.

Reciprocating movements must be achieved.

It is necessary to ensure that there is no air leakage and work stably and efficiently for tens of thousands of hours.

To be honest, it is indeed quite difficult for an ordinary hardware factory to manufacture compressed cylinders that meet the above conditions.

Even the further he got to the back, Yang Mengchao was involved, called a lot of experts and asked people for advice everywhere.

One week later.

After spending a lot of precious materials and paying a considerable cost, Yang Mengchao finally brought people to make qualified compression cylinder components.

As long as the compression cylinder is heated and the fresh water inside is boiled, the compression cylinder will begin to perform reciprocating movement, just like the most primitive but also the most miniature steam engine.

"I didn't expect that a small compression cylinder would have such high technical content and so many ways."

Yang Mengchao sighed and said, "Compared with those technical parts, my hardware factory is at the bottom of the industrial field and has no technical content at all."

"If this continues, it will take many years for my factory to be eliminated and replaced by more advanced factories, because my factory does not have core technology and no real competitiveness, and I just think about the good days in front of me and never pay attention to it."

"We can't continue like this, core technology! We must have core technology. We cannot wait for this factory to be passed to my son, but we are facing the dilemma of closing down. For the long-term consideration, my factory must find a way to make it have core competitiveness!"

Yang Mengchao woke up.

A small compression cylinder part gave him a huge sense of crisis, which led to the opportunity for "Mengchao Hardware Factory" to take the technical route.

...

The most core component has been solved.

The rest is very simple.

The compression cylinder is connected to two cylinders and combines it to form a 30-pound backpack that can be carried on the back.

In addition, a rubber hard tube extends from the bottom of the two cylinders to the special jet shoe sole.

There is a circular nozzle at the bottom of the jet shoe, which is closed by default.

In addition, a control device will be extended to each of the jet shoes, and the end is a handle held in the hand. The operator can adjust the size of the nozzle by pressing the handle switch, from the smallest to the maximum, and can make more precise adjustments, with the minimum adjustment amount being about 1%.

As for the use process, it is simple and clear.

First heat the compression cylinder and let it continuously press air into the two connected cylinders. When the air density in the cylinder is large enough and the pressure is high enough, a strong rear thrust can be generated after spraying.

Zhang Nan, who is stepping on the jet shoes, can adjust the thrust by adjusting the handle on his hands.

"Instructor, thank you, I've helped me a lot this time."

On May 19, Zhang Nan came to take away his "high-pressure jet flight backpack" and expressed his gratitude to Yang Mengchao.

"Need not."

Yang Mengchao waved his hand: "Maybe I should thank you. Your job has given me a lot of inspiration."

"See you next time, instructor."

...

Go back to your own farm.

In the research room, Zhang Nan immediately made a slight change to the "flying backpack".

That is, at the top of the compression cylinder component, use a laser to open a hole as big as a pigeon egg, and then put a sealed dense gold rod into the hole, and then take out a space as big as a longan at the end of the dense gold rod - this longan space is where the energy ball is placed in.

You should know that secret gold can withstand high temperatures of millions of degrees.

As long as the dense gold is heated to several thousand degrees, the water in the compressed cylinder can be vigorously heated and quickly turned into high-pressure steam, pushing the piston to do work.

The pressure in the cylinder will also continue to increase until it reaches a level that can generate dozens of kilograms of thrust.

On the 20th, Zhang Nan started the relevant test, but did not dare to go to heaven immediately, but first tested how much thrust it could produce.

On the 22nd, he tied sixty kilograms to his feet to a sandbag and conducted an ultra-low-altitude flight test. He could hang in mid-air 30 cm from the ground for 45 seconds.

On the 23rd, before the official test flight, for his own safety, Zhang Nan used all the 1,050 units of life energy he had saved in the past two months to strengthen his body.

That is, except for the right arm, other parts of the body, from head to toe, from inside to outside, are evenly strengthened.

Enhance your body by about 10% saturation.

Although it is only 10%, the changes are still huge. The muscle strength, bone hardness and toughness, internal organs, brain nerve reaction ability, and thinking ability have all been greatly improved, and the whole body is filled with explosive power.

Just jumped directly from a place ten meters high, Zhang Nandu firmly believed that he could be unscathed.

Stay stable!
To be continued...