on the plane.

Lin Lao gushed to Qin Feng endlessly.

"When the prototype rolls off the assembly line, the first thing to do is the run, which is divided into three main scenarios."

In fact, Qin Feng knows, after all, the J-10 test flight was so famous, but he has carefully read all the test flight reports, especially a migrant science and technology magazine, which has done an exclusive interview with the test pilot, which makes people feel that it is not easy for aircraft designers and test pilots, and how difficult it is to fly a fighter.

"Mistracking solved?" Qin Feng asked casually.

There are three types of sliding, low-speed sliding, which mainly determines whether the aircraft is an expensive tricycle is flexible, and medium-speed sliding to determine whether the design and manufacture of the aircraft are symmetrical, if there are defects, it will deviate.

In history, the problem of J-10 deviation has plagued the designer for a long time, and the problem can be solved only after a few months of running.

"Deviation? How is it possible, our J-10 is of first-class quality, and the medium-speed running experiment is going very smoothly, but it is currently stuck in the high-speed running operation. ”

Medium-speed taxiing to verify whether the aircraft is symmetrical, high-speed taxiing is to verify whether the aircraft can fly, which requires pulling up the nose on the runway, the front wheels are suspended, and the two tires continue to slide on the runway, and after running out for more than ten meters, then put the front wheels down, so as to complete the high-speed taxiing experiment.

J-10 got stuck on this high-speed run.

"The runway of Factory 132 is not long enough, if you want to pull up your head, you can only let the plane fly, and the distance to slow down is not long enough." Lin Lao said: "Now I am stuck in this difficult hurdle and cannot move forward, and the runway cannot be lengthened, so I can only send the plane to the test flight institute." ”

The initial test flight of the aircraft is carried out in the aircraft factory to verify the basic flight ability, which is no problem, and then it can fly to the test flight institute for a more professional test flight.

At present, the runway is not long enough, high-speed taxiing cannot be done, the plane cannot fly, and it cannot fly to the test flight institute, but only the test flight institute has a long enough runway to do high-speed taxiing experiments.

So, the test flight was trapped in this project, everyone was helpless, and the Air Force had no choice, so he planned to go over to see the situation, before leaving, Lin Lao thought of Qin Feng, a clever ghost, so he called Qin Feng to go over together, planning to discuss a solution.

"At present, how to get the plane to the test flight institute is a big problem, high-speed taxiing can't be done, the plane can't fly, let alone fly to the test flight institute. Therefore, we thought that when the Jian-8 went to the United States, the wings were removed and stuffed into the transport plane, do you have a way to rent a transport plane for us at a low price, and let us transport the plane over. Rest assured, you won't be asked to pay. ”

This dead cycle must be broken, and we have to find a way from the outside world, and the way the Air Force is currently thinking of is to rent a transport plane, and it has to be rented at a low price, which they can't do, but Qin Feng may have a way.

The domestic Yunba does not have this ability, and needs a strategic transport aircraft, like the Il-76.

Qin Feng smiled and shook his head: "There is no need for a transport plane." ”

"How do you solve that?"

"A shake of the wrist will solve it."

The people on the plane are confused, and with a flick of the wrist, it can be solved? How to shake?

Plant 132, apron.

"Leizi, this test flight subject is high-speed taxiing, but the runway is not long enough, so as long as you taxied to the middle of the runway, you must slow down immediately, if you can't stop the plane in time, the plane will be destroyed."

"yes, I see." Lei Qian nodded: "Old Song, don't worry, although the wheels can't be pulled, we can also rely on the strong engine to make the plane reach a high enough speed!" ”

Relying on the powerful thrust engine, the plane can glide to a speed of more than 300 kilometers per hour on the runway, but the front wheel just can't be lifted! This makes people wonder, but Lei Qi already has a bold idea in his heart.

Stepping into the cockpit and starting the engine, Lei Qi operated the plane to the end of the runway, aiming at the runway centerline.

"001 call, sixth high-speed run experiment request begins!"

"Yes, slow down!"

You don't need to open the afterburner, as long as you push the throttle stick to the head, the third aunt can burst out more than seven tons of thrust, which is more than enough for sliding!

With the roar of the engine, Lei Qi released the brakes, and the J-10 began to slide on the runway, faster and faster, one hundred, one hundred and fifteen, two hundred, two hundred and five......

The small three-point landing gear is speeding on the runway, and the large delta wings are moving in the wind, as if they are ready to fly at any moment.

However, with each test, the nose landing gear could not be pulled up, and this time ......

Thunderbolt quickly pushed the throttle to slow down, and then pulled up the landing gear.

The roar behind was quiet, the runway in front disappeared, and in Lei Qi's field of vision, it was already all blue sky!

"I'm grass, what's going on?" An exclamation suddenly came out of the headphones: "Leizi, your nose landing gear is up!" ”

"001 report, I don't know what's going on, just shook my left hand and pushed the throttle stick back!"

Song Lao stood on the runway, looking at the J-10 with wide eyes, its nose landing gear had left the ground more than a meter, and its fuselage had already brought up the elevation angle, just like an eagle spreading its wings, it might fly at any time!

Solved!

The problem of high-speed running is solved!

J-10 only skied for 200 meters, then pulled up the front wheels, continued to slide for dozens of meters, the front wheels were lowered, and then braked steadily, there were still hundreds of meters from the end of the runway!

By the time Lei Qi slid the Jian-10 into the tarmac, a large number of people had already gathered below.

"Leizi, amazing, with a shake of your wrist, you solved the problem that bothered us!"

"What's the principle?"

"We couldn't pull the nose up, originally we just thought that the runway was not long enough, or the aerodynamic torque of our rudder surface was not large enough, but in fact, it was caused by the thrust of our engine was too strong."

At this time, Song Lao had already analyzed.

"Every time you want to pull the nose, the tail will go down, the airflow of the engine will blow downward, and there will be a reaction force, resulting in too much torque required to pull up the head, and the thunderbolt reduces the thrust of the engine, our aircraft has a good lift coefficient, so the nose is pulled up all at once!"

At this time, Song Lao was full of excitement, why didn't he expect it? Lei Qiao's so-called hand trembling is just a rhetoric, he must have thought of these theories, and then he went on the plane to experiment, Lei Qiao is the best test pilot!

After the early airplanes were developed, they were all flown by designers, but as the speed of the aircraft became faster and faster, the physical fitness of the old pedants of the designers was not good enough, so they could only let professional test pilots fly.

Test pilots must not only be able to fly, but also be familiar with aircraft, and must be able to analyze the problems encountered in test flights, and become the best test flight engineers, and Lei Fei is undoubtedly one of the best, choose him as a test pilot, yes!

"Immediately inform the Capital Aircraft Building of this news, we have solved the problem of high-speed taxiing, and we will be able to make our first flight soon!"

"No need to send a telegram, they're already here."

In the sky, a roar sounded, and a Yun-7 aimed at the runway and landed.

When Lin Lao got off the plane, he shouted: "Old Song, old Song, the problem of high-speed sliding, we can reduce the opening of the throttle valve ......"

The aircraft throttle is just a popular saying, the professional saying is called the throttle valve, Lin Lao's words have not been finished, and there is a loud voice on the other side shouting: "Lao Lin, let's solve the problem of high-speed sliding!" ”

What?

Qin Feng, who stepped off the plane, was a little silent, that is to say, I came in vain?

I thought I could come to give a guide, but I didn't expect that Lei Qi had already done this, and he couldn't pretend to be able to do it.

However, the frustration lasted only for a moment.

"The problem of high-speed taxiing has been solved, will our plane be able to make its first flight?"

"We need to conduct more than a dozen more test flights, further fine-tune the fly-by-wire operating system through the data from the test flights, and then it's time for the first flight!"

"For the safety of our first flight, I suggest that we add some counterweights to the plane and adjust it to a static and stable state."

"No, we were originally designed according to static instability, if we are transferred back, what is the point of the first flight, we have to be transferred back in the future! The previous test flights were all wasted, and we have to fly again! ”

"The advanced aircraft of various countries need to be transferred back first when they are tested for flight, and the test flight is very dangerous, just like that, the planes of various countries have fallen, we have to be cautious, if they fall, the whole project may be ruined."

A new problem arises again.

Static aircraft are more agile and more powerful in air combat, but the complexity of the flight control is also high, and if the procedure is overlooked, it can cause big trouble.

To put it more bluntly, it is very likely that the plane just left the ground and fell headlong due to a flight control defect! If the first flight really encounters this kind of problem, then the entire No. 10 project may suffer a major setback.

So, to be on the safe side, then first adjust to a state of static equilibrium, at least the first flight is safe.

"The third-generation aircraft of various countries are already flying all over the sky, and we are seriously outdated in this field." Lei Qian spoke: "We don't have time to waste, we don't need to adjust the flight control, I'm willing to fly!" ”

"Leizi, we are very touched by your fearless spirit, but this is not only a personal safety issue, but also an airplane!"

"If the plane falls, our Pacific Group is willing to donate money to build another aircraft of the same type!" Qin Feng spoke.

Now that you're here, you have to play a role!

How expensive is the prototype? Millions? Even if it is hundreds of millions, we can afford it, because Qin Feng knows that the design of the J-10 is very perfect, and during the entire test flight, not a single plane has been dropped, creating a miracle!

Although the construction period is now advanced, it is just because the engine and avionics are in place in advance, flight control or something, don't worry, the 611 Institute has been studying the canard layout since its establishment, and after so many years of research, the technology has long been mature.

The so-called donation is simply impossible, and now you can still sell favors, so why not.

"All countries in the world are entering the ranks of third-generation aircraft, and we are already too far behind the world's advanced level." Song Lao said: "Every engineer of our No. 10 project is eagerly looking forward to the completion of this project as soon as possible and contribute a new fighter to the motherland." We can't waste time, I decided to use the current flight controller for the first flight! If something happens, I'm willing to take full responsibility! ”

"Okay, then I make a statement on behalf of the Air Force, I support the first flight with a static and unstable layout, if something happens, I will bear the responsibility!" Lin Lao also spoke.

"Ahem, how long will the first flight take? If the time is short, I won't toss back and forth. Qin Feng asked.

"Half a month."

"Okay, then I'll wait for half a month!"

"Mr. Qin, this is not very good, I heard that you can't eat if you don't see your son for a day......"

"Who said that? I, Qin Feng, am a typical example of giving up my small family to take care of the country, how can I soak in a comfortable nest. It just so happens that I will also see how far our Thunder project has progressed, this aircraft is a big project related to the next profit of our Pacific Group. ”

Qin Feng walked with a relaxed pace and came to the production workshop, and then saw the Thunder Dragon fighter being assembled.

"Our Thunder is progressing so fast?" Qin Feng was stunned.

"Yes, it was originally a light aircraft, it was not technically difficult, and we also used computer-aided design, and now that we have completed all the design projects, of course we have to build a prototype quickly." Bezlyutko said: "Moreover, since I am here, I have to show my abilities so that I can join your project of a twin-engine heavy canard layout fighter in the future." ”

Qin Feng reacted.

J-10 is already conducting a sliding experiment, on the runway of Factory 132, although it is still a secret to the outside world, but it is absolutely impossible to hide the employees here, Bezlyutko must have seen J-10 intentionally or unintentionally, so Bezlyutko knew.

Dongfang does have a canard layout fighter project, which has reached the stage of test flights! The territory of the East is vast, and there will definitely be a need for twin-engine heavy machines in the future!

He's going to have to perform well and prove his abilities before he can get a chance to be part of this kind of project in the future.

"Mr. Bezlyutko, then come on, there will definitely be a chance in the future."

Elder Tu also echoed on the side: "Mr. Bezlyutko, your skills are amazing, and your achievements in our East in the future are limitless!" ”

As long as you praise a few words, you can be motivated, such a person is no longer easy to find in the East, and Lao Maozi's engineer is still quite simple.

Qin Feng lived in the land of abundance, looking at Xiaolong and Jianshi every day, and living a good life, although he was not interfering in some things, he was still imperceptibly going on.

Across the Ocean, Lynchburg College, Ginia.

Mathematician Thomas looked at the little train in front of him, no, Pentium Computer, his face was full of smiles: "That's great, next, I'm going to do something that can drive computers crazy, come on, Pentium Computer, let's wander in the world of mathematics!" ”

Then Thomas's hand began to tap quickly on the keyboard.

In the same office, physics professor Robert gave him a disdainful look: "You mathematicians just like to do some meaningless work, you might as well use this computer to simulate a few physical models." ”

"No, no, you don't understand, the Brownian constant is a mental blow to us mathematicians, and for you, it is tantamount to the emergence of a double-slit interference experiment, which collapses the edifice of classical physics!"

Thomas's Brownian constant is a dark cloud in the mathematical world, and it appears because of simple prime numbers.

I have learned prime numbers in the fifth grade of primary school, and I also need to be familiar with prime numbers within 100, and I can find some rules: there are more prime numbers at first, and then there are fewer and fewer them.

However, there are many interesting rules, such as many prime numbers that differ by 2, 3 and 5, 41 and 43, 10007 and 10009, and so on, and these continuous prime numbers with a difference of 2 are called twin primes.

More than 2,300 years ago, there was a pesky guy Euclid who liked to dig holes and didn't like to bury them, and he began to make up his brain: Are there infinitely many twin primes?

In 1919, Norwegian mathematicians proved that even if there were an infinite number of twin primes, the sum of their reciprocals was equal to a finite value, which was called the Brownian constant, because the mathematician was called Viagra-Brown.

So, what exactly is this value? Is it really converging on a certain number, or is it divergent?

If it is divergent, then Euclid is right, and if it converges to a constant, then ......

If the math can't prove it, then forget it, just add the reciprocal of all the prime numbers?

Mathematicians in the seventies counted millions of prime numbers to the eighth decimal place, but that wasn't enough, and now that there are more advanced computers, mathematicians can do it, and there is no such thing as mining anyway.

"I'm going to count a billion numbers, and I'm going to do it in two ways, thanks to Intel, for providing me with such a powerful computer."

"This is not provided to you by Intel, this is what you bought with your own salary, more than 10,000 dollars, I don't know if Intel is crazy, or you are crazy."

"There's a two-hundred-megahertz processor here, and it's worth the money!" Thomas said as he continued to crack on the keyboard.

The so-called two methods are actually simple, one is to directly turn the reciprocal of the prime number into the accumulation of decimals, and the other is to divide the reciprocal of the prime number first and then add it.

The program is not difficult, the key is the calculation, even if it is a 200 megahertz processor, it needs to be calculated day and night for ten days!

Five days later, the first program calculated the results, and Thomas patiently stored the results in a document, printed a copy, and then calculated the second results, and after another five days, the results came out.

Looking at the data displayed on the screen, Thomas's eyes widened: "Damn, how can this be, the gap between these two calculation methods is actually ...... It's bigger than the pit Euclidean dug! ”

The Brownian constant, when calculated to the eighth decimal place, gives the result of 1.90216054. What now? The result calculated now is actually eight o'clock!

Bang!

Thomas felt that the math edifice he had believed in for half his life had collapsed!