"It's so scattered, what should I do if I have to return it then?"

Chen Yi asks a key question.

Although the Black Hawk was picked up by being shot down into the airspace.

But not surprisingly, the protest and demand for return on the other side have now been sent.

According to some unspoken rules between the great powers.

Unless the skin is completely torn apart, this matter, after some negotiations, Black Eagle still has to return it.

This time can be as short as three or five months, and as long as one and a half years.

In any case, the opposite side will not let this strategically important Black Hawk stay outside for a long time, so that others can completely understand the Black Hawk technology.

What you can do is to mobilize as many researchers as possible before the return date.

Research and learn more about the Black Hawk's technology and get more out of it at the negotiating table.

But now that Black Hawk has been dissected like this, how can this still be ......

"It's simple, the Black Hawk crashed into the sea at an altitude of tens of thousands of meters, and no one knows how many fragments of the Black Hawk are left except us."

Professor Zhang explained with a smile next to him: "It's good that we can rush over in time to help our friends pick up some fragments."

But maybe, if we didn't get in time, the Black Hawk lost its engine and sank to the bottom of the sea. ”

"Yes, the engine has "sunk into the sea", they speak nicely, we can help "fish" the engine and return it.

It's not nice to speak, not to mention the engine, it is estimated that even the main body of the Black Hawk's fuselage has sunk into the sea.

We're slow, and there's only a few skins left on the sea......"

The other professors next to him answered, and their faces were full of expressions that you understand.

“......”

Chen Yi was shown by this kind of operation.

Sure enough, on the operation.

It depends on the professionals.

A folk player like him is obviously much worse.

Chatted for a while.

Chen Yi went over to the main body of the fuselage, carefully looked at the structural design of the fuselage, and the stealth design.

Small planes and large planes, although they are both airplanes, there are big differences in the structure and design of the two.

The structural stresses involved, the aerodynamic layout, including the load on the body during acceleration maneuvers, the compression injection structure inside the engine, and other parameters are not as simple as scaling up.

Instead, some are scaled up, some are exponentially amplified, and some are expanded in shape, and the aerodynamic parameters or combustion parameters need to be adjusted and reduced.

These differences are as complex as redesigning an aircraft as a whole.

"It turns out that the structural design of large aircraft, because of the improvement of the windward side, in addition to the material strength of the fuselage, has higher requirements for the lift coefficient and drag coefficient of the aerodynamic layout.

In addition, the resonance, flutter, thermal expansion and contraction of the fuselage also need to be strictly controlled......"

Chen Yi studied for dozens of minutes, and probably had a concept for the structural design of large ultra-high-speed aircraft.

Figuratively, this is like a small piece of iron, even if it is accelerated to supersonic speed, because of its small size and simple structure, the iron sheet will not be affected too much.

However, if the iron sheet is replaced by an iron sheet airplane, because the volume increases, the structure is more complex, and the stress and air resistance of each component are different.

Once supersonic speed, it will collapse in an instant.

This is similar to the rocket return capsule that failed to return to the ground in space, and the entire return capsule will only crumble into large and small pieces.

But the shattered fragments do not continue to shatter smaller fragments.

This is due to the fact that the various forces under high speed are different depending on the volume and structure.

The same is true for thermal expansion and contraction, resonance, flutter, etc.

Chen Yi's drone is less than 2 meters in size, and the state of room temperature and the high temperature of thousands of degrees Celsius caused by hypersonic friction do not change much in the fuselage.

But if you change to the 18-meter Big Black Hawk, when flying at hypersonic speed, the entire fuselage will expand by more than 50 centimeters due to high temperatures, which are at room temperature on the ground.

If the gaps caused by these expansions and the deformation of the fuselage are not properly controlled, the entire fuselage will collapse at high speeds.

"Xiao Chen, don't be busy looking at the fuselage.

Take a look at the true heart of this Black Hawk, a trio of scramjet engines. ”

Seeing that Chen Yi had been staring at the fuselage structure of the Black Hawk and studying, Professor Zhang walked over and pulled Chen Yi over to the scramjet engine that had been disassembled on the other side.

"What's there to study about this, didn't I give a better rotary detonation engine?"

Chen Yi walked over and looked at the scramjet engine that was completely scrapped because the battery broke through the side wall of the combustion chamber, and a small half of the area was melted and solidified again due to the high temperature of the combustion chamber.

He is interested in large flying machines and has no design experience.

Even if you have mastered the knowledge of aerodynamic layout, engine manufacturing, aircraft design, etc., you need to re-learn and re-study.

But Professor Zhang's group of people are all bigwigs who have designed and researched aircraft for decades.

It has led the development process of aircraft from imitation to transcendence, from import to export.

I am almost familiar with the characteristics of aircraft and engines of various sizes, but I am not experienced enough.

With the technical specifications of the rotary detonation engine that he provided.

Even if it is just a miniaturized rotary detonation engine, it is believed that it will not be difficult to convert it into a super engine for large aircraft.

In this case, what is scrambling stamping also studied.

Wouldn't it be better to go directly to the rotational detonation, in one step?

"Rotary detonation engine, this is an advanced version of the rocket engine.

Although Xiao Chen, you added a turbojet structure when you designed, and made a combined engine of turbojet + rotary detonation.

But in the critical airspace near the Kármán line, there is no stamping performance and scramble.

The performance, efficiency, and adaptability of the engine are still much worse than the Black Hawk's three-combination scrambling engine.

At present, the tactics and strategies of air combat are gradually developing toward high-altitude, ultra-high-speed, and critical space.

Without scramjets, we will suffer in the future. ”

Professor Zhang explained with a wry smile.

"In this way, it is not enough to go directly to the space fighter and occupy a higher airspace." Chen Yi blurted out.

But after saying that, I realized in my heart that something was wrong.

There is an obvious barrier between space and planetary space.

- Atmosphere.

If you want to return from space, you must control the speed and angle precisely, otherwise you will be burned up by the atmosphere.

Faced with the atmospheric obstacle of returning to the planet, no matter how handsome your space fighter is, unless you get on the laser, it becomes a Gundam.

Otherwise, it is difficult to pose any threat to combat aircraft in the atmosphere.

Realizing that something was wrong, Chen Yi also began to get serious: "What is the combination of this Black Eagle's engine?" ”

"The triple combination of turbojet + subramjet + scramjet has the characteristics and advantages of three engine engines."

"I'll see."

Chen Yi walked up to the Black Hawk engine, which was much taller than his own, put on a protective mask and took a flashlight into it, and checked it carefully.

Professor Zhang and a group of other experts and senior engineers, all of whom stood outside waiting, looking expectantly watching Chen Yi busy inside.

I know that Chen Yi's rotary detonation engine was designed by Chen Yi, a man-made moon landing drone, and an ion propulsion drone in the atmosphere.

They all know that in the fields of aircraft design and manufacturing, engine design and manufacturing, Chen Yi's attainments are no lower than them.

In addition, young people have bigger brains and more active thinking.

It is not necessary to see the mystery of the Black Hawk scrambling engine, and give different inspiration and insights.

Chen Yi studied for a while and walked out with some regret.

"The damage is too severe, and I can't see the key point of this engine to achieve the triple combination......"

After saying that, everyone was disappointed at once.

Professor Zhang patted Chen Yi on the shoulder and comforted: "It's okay, it's okay to see it for a while."

During this time, Xiao Chen, if you are free, you will stay and be treated as a specially appointed expert.

We strive to research as many key technologies as possible before the Black Hawk returns. ”

"Yes, the technology is not a breakthrough in a moment and a half, and I am very happy that a technology like scrambling can be put into practical use within three years."

"Take your time, the food in Rongfei's canteen here tastes good, let's enjoy the food slowly and study it slowly."

It seemed that he was afraid that Chen Yi would have any psychological burden, and some other expert senior engineers also hurriedly picked up, smiling and relieved that this matter was not in a hurry.

"Wait, I'm not done yet."

Looking at this group of people who were obviously the most uncomfortable in their hearts, but they were comforting themselves, Chen Yi thought for a while: "I don't know how this engine of the Black Eagle can achieve three combinations of scramramjet.

But for the turbojet + subramjet + scramjet triple combination engine, I do have some feasible ideas.

If the model is large enough, it can also be combined with a rotary detonation structure to design a four-combination engine, or even a five-combination engine with a turbofan. ”

"What!?"

"Isn't that a joke?"

Professor Zhang and a group of others were stunned and looked at Chen Yi with incredulous expressions.