Wang Buan felt that Liu Zhenhua was wrong.

He should say that it was 125 for the first time in the sky. The first time it was in full swing.

Because before that, 125 had already gone to heaven.

Before leaving the factory, there must have been test flights.

Otherwise, how did it get from the factory to the experimental base?

Before arriving at the experimental base, the 125 must have been repeatedly tested and made sure that there were no fatal problems before it could come here.

It's just that the test flight before leaving the factory was done by the factory itself. The basic goal is to "fly".

When it came to the experimental base, it was an all-round investigation. It is a requirement to "fly well".

There is too much difference between "flying" and "flying well".

Any engine can make the aircraft "fly".

However, it is not easy to "fly well", be reliable, stable, and can be used repeatedly for a long time.

China's aviation industry has always been stuck in this article.

Why do all aviation people have a deep affection for the J-8?

Why are the Su-27s with better performance retired, and some of the eight masters are active between the sea and the air?

Because it is the first child in the Huaxia aviation industry.

In its body, the people of China Express Airlines have poured too much effort into it.

It was also from the stumbling manufacture of the Jian-8 that China's aviation industry gradually began to take off.

Without J-8, there would be no stars such as J20 today.

Now, the eighth master is going to contribute his last strength.

Sure enough, not long after, Han Xuewei brought back a large amount of information.

It is exactly the test flight data before leaving the factory.

There's a lot of data. Very informative.

The time, speed, altitude and status of each test flight are recorded in detail.

Laymen often have a headache when they see dense data. But insiders, as long as they look at a few key data, they can basically understand what is going on.

Before leaving the factory, the 125 flew for a total of 25 hours. Maximum flight speed of Mach 0.8. The maximum flight altitude is 2500 meters.

Obviously, these are very conservative data. It just happened to prove that the 125 was able to fly.

Why is the data so conservative?

First, the test pilots at the plant had limited experience and limited skills. In case of danger, it is difficult to deal with it.

Second, if the speed is too fast, it will exceed the airspace range.

Thirdly, the flight altitude needs to be coordinated. Air traffic control must be implemented.

Only in the experimental base can there be a relatively vast airspace, which can be flown to your heart's content. There are no restrictions on speed and height. Test pilots are also experienced.

There are many civil airports in our country, and commercial routes are very dense. Especially in the eastern region.

It's almost impossible to clear a safe airspace.

Unless air traffic control is imposed.

But then there will be a lot of stranded flights. Delayed passengers are strongly dissatisfied.

"Wang Buan, come here. Liu Zhenhua beckoned.

"It's coming. Wang Buan hurried over.

"Let's meet first. ”

"Okay. ”

The group entered the conference room.

There were only five people.

Liu Zhenhua.

Wang Buan.

Yuan Zhen.

Li Tonghe. Deputy Squadron Leader of the Test Flight Squadron.

Zheng Jincheng. Deputy Director of the Experimental Base.

The main topic of discussion was the first test flight content.

How to test the thrust of the 125.

Two small things are included: flight speed. Flight altitude.

Obviously, it was directly for Double Three.

For any aircraft (not just fighters), double three, is a very attractive indicator.

Flight speed Mach 3.

The flight altitude is 30,000 meters.

Even today, when space is densely packed with reconnaissance satellites, these two indicators are very meaningful.

Especially for flight speed, Mach 3 is definitely tough.

The world's martial arts are invincible. Only fast is not broken.

What does the missile rely on?

It's speed!

Ordinary missiles, the flight speed is about Mach 3-5.

There are very few missiles that exceed Mach 5.

Theoretically, as long as the flight speed exceeds Mach 5, it can evade most of the missiles.

The problem is that so far there have been no mounted fighters with more than Mach 5. Testing machines, concept machines, etc. are not counted. There are some concept machines that are even capable of reaching speeds of Mach 6. But there is no real combat significance. Their cost, as well as their reliability and stability, are destined to be impossible.

In modern air combat, speed is also the key to victory.

The faster you go, the more likely you are to take the initiative.

Air combat also has commanding heights.

As long as you seize the high ground, you can increase the probability of victory.

In the unfortunate event of defeat, the chance of fleeing can also increase. In the past, the MiG-25 relied on speed to shake off the enemy.

As long as you get rid of the enemy, you have a chance to make a comeback.

Especially in the face of a large number of enemy aircraft, the speed is simply the Dugu Nine Swords in the rivers and lakes.

You want to fly a kite?

Do you want Mangu?

Do you want to break them all?

Do you want to lure the enemy deeper?

Do you want to go straight in?

Do you want to go off the rails?

Both.

As long as you have enough speed, you can do whatever you want.

That's right, just do whatever you want.

In air combat, there is speed, and it is really possible to do whatever you want.

So, here's the problem.

It is not easy to break through Mach 3.

In addition to the very strong engine thrust, other components are also required.

Especially the fit of the fuselage skin.

Aluminum skins cannot withstand extreme heat. Once it exceeds 200 degrees, it will soften or even melt.

Titanium alloys, of course, can.

However, titanium alloys are too expensive. Can't afford it.

Then, the only option can only be stainless steel.

Good value for money and very low cost.

Therefore, the outer skin of the No. 1 machine is stainless steel.

In a sense, the J-8 with a stainless steel appearance is a bit like a copy of the MiG-25.

But its engine life is much more powerful than that of the MiG-25.

From the very beginning of testing to now, the 125 has been in operation for more than 500 hours.

No faults have been found so far.

Purely in theory, it is simply a flawless engine.

Reliable.

Stable.

Long lifespan.

There is no need to refuel yet.

Looking at the world, is there any other engine that can compare?

No.

Definitely not.

Now, it's time for it to soar.

"Chief Engineer Wang, what is the maximum flight speed of the No. 1 aircraft according to your theoretical calculations?" asked Li Tonghe.

"Without the suspension of any weapons, with a take-off weight of 18 tons and an altitude of 20,000 meters, the theoretical maximum speed can exceed Mach 8. Wang Buan said cautiously.

"What if it's at 35,000 meters?"

"Mach 6.3112. ”

"What if it's 40,000 meters in the air?"

"Mach 5.5614. But I advise you not to exceed Mach 5. I'm worried that the appearance of the fuselage can't handle it. ”

"The exterior of the fuselage is stainless steel, which is very strong. It can withstand high temperatures of 800 degrees. ”

"But there are air bubbles in the partial welds of the wings and fuselage. At an altitude of 40,000 meters, the difference between the internal and external pressures is too great, and the bubbles will expand. There is a possibility that the weld will crack. ”

"I remembered. ”

All of them behaved professionally.

Of course, Wang Buan also has to behave very professionally. Data is accurate to four decimal places.

"What about the maximum overload?"

“16G。 ”

"How much?"

“16G。 ”

Li Tonghe, Liu Zhenhua, Yuan Zhen, Zheng Jincheng and others all looked at each other.

Immediately, their eyes were all shocked and focused on Wang Buan's body.

16G overload?

Oh, my God!

This overload is going to be fatal.

You must know that in the entire test flight group, the maximum overload is 9G.

16G, it will definitely cause the test pilot to lose consciousness.

Did Wang Buan say something wrong?

Will there really be such a big overload?

"I'm not wrong. Wang Buan said slowly.

"You say it carefully. Liu Zhenhua said solemnly, "This problem is very serious. It has to be addressed. ”

"First of all, the design of the J-8 itself leads to its high-speed performance being too good and too easy to accelerate. Wang Buan said methodically, "Its original design was a high-altitude and high-speed fighter, emphasizing fast flying." So, once the thrust of the engine is sufficient, its speed can be easily increased. If the speed is increased too fast, the result is too much load. ”

"Isn't there a balancing measure?" Li Tonghe said with a frown, "It's dangerous to have a load of more than 8G." ”

"It's a pity. No. Wang Buan said bluntly, "The original design of J-8 did not take this into account. There is no need to think about it either. ”

Li Tonghe and Liu Zhenhua looked at each other again.

Yuan Zhen and Zheng Jincheng also frowned.

An overload of 16G is unbearable anyway.

This is not something that can be solved by the will of the test pilot.

In the history of world aviation, the largest overload record, that is, about 9G. Beyond 9G, the test pilot will definitely be unconscious.

"Is there a solution?" asked Liu Zhenhua.

"Yes. Limit acceleration. Wang Buyan replied indifferently.

"How?"

"Human control. ”

"No, I can't. Mere human control is unreliable. An electronic control system must be installed. ”

"That's right. An electronic control system must be installed. ”

Wang's opinion was rejected.

Relying solely on the control of test pilots is certainly not possible.

In the unlikely event that the test pilot makes a mistake in operation and causes an overload to overflow, he may be unconscious before he has time to react.

Fortunately, it is possible to install an electronic alarm device.

As soon as an overload is detected, an alarm is sounded.

At the same time, the power output is automatically limited.

This is within the scope of Yuan Zhen's design.

Yuan Zhen said that the problem is not big.

"Okay, this problem is solved. Liu Zhenhua nodded.

"Next question. Li Tonghe continued, "Engine afterburner time." ”

"There are no limits. Wang Buan replied.

"Are you sure there are no restrictions?" asked Li Tonghe cautiously.

"Sure. ”

"Good. ”

Liu Zhenhua suddenly interjected: "Even so, let's limit it." For the first test flight, the afterburner state cannot exceed 10 minutes. ”

Li Tonghe nodded and said, "Okay." I think so too. ”

Wang Buan habitually pouted.

Too careful.

What is 10 minutes top for?

125 In fact, there is no such thing as afterburner or not.

There is only the difference between a normal throttle and a high-horsepower throttle.

However, others are professionals, and since they have already decided, he will not question them.

Overall, the results of this meeting were quite satisfactory.

Then it's time to eat.

Then came the evening.

Bathe.

Go to bed.

Recharge your batteries and wait for the next day.

I'm going crazy. 17,000 words updated today! I hope you don't abandon me. Ask for a little referral vote!