The fire moon is coming, and the huge sun is flying in the air.

Even in this country located in the northern part of the mainland, some areas began to feel like a "spicy summer".

Gao Wen turned the information in front of him to the last page. The charts and data on the information slowly settled in his mind. After a few seconds of thinking, he raised his head and looked at Rebecca and Maggie in front of him: "So the recent experiments that have tried to break through the 'missile limit' have failed?"

"...Yes, all failed," Rebecca said with special frustration, "whether it is to increase the thrust of the driving array or change the layout of the wind-system force field, all kinds of methods are useless. I have sorted out the detailed records of each failure, which are the ones you just saw."

"Well... I saw it," Gao Wen frowned, his eyes swept across the stack of documents that had been placed on the table. A long-lost sense of unknown and contradiction was permeating between the lines of the document, stirring his mind at high speed. "And all tests encountered similar problems in the final stage of acceleration... The magic field that maintained the acceleration was suddenly disturbed greatly, and the output dropped sharply, and the aircraft slowed down accordingly..."

"That feeling is like suddenly crashing into a chaotic and disorderly and particularly powerful 'magic quagmire'," Maggie, who personally performed most test flight missions, immediately reported her feelings at that time. "No matter how much effort she had maintained before, she would quickly collapse by the quagmire and could not get up at any speed."

Gao Wen fell silent for a short time and thought in silence.

The limit of missiles, the speed limit that all physical flying objects will face. After approaching this limit, the flying objects will be captured by an invisible but powerful "mud". If it is a magic-driven flight device, it will be manifested as the magic field that maintains thrust will be collapsed. If it is a bird or beast in nature that does not rely on magic power... Although the reason is unclear, they cannot break through this "barrier".

This is a very familiar phenomenon, so familiar that Gao Wen couldn't help but think of the difficulties faced by high-speed aircraft on Earth: sound barriers, but...

He sighed softly, raised his head, and said as if he was talking to himself: "The known atmospheric speed is..."

"According to the data measured by scholars in the north that year, near sea level, near freezing temperature, the speed of sound in the atmosphere is 322 meters per second." Rebecca said immediately.

The Northland is the magic holy land of Ansu in the past. Due to the influence of the Wilder family, a large number of outstanding mages and scholars were concentrated in that cold land. In order to explore the mysteries of various magic phenomena, even the mages of the old era would do a series of research on nature. Therefore, concepts such as atmospheric sound speed, air pressure, and the boiling point of various substances have always been found among the upper intellectuals, and the data is very accurate.

At this moment, some precise number in it... was stirring Gao Wen's nerves like an annoying little demon.

In this world, the atmospheric speed of sound at standard air pressure and freezing temperature is 322 meters per second - two-thirds of the missile limit.

The speed barrier encountered by Rebecca's aircraft is not a sound barrier, but another completely unknown thing.

In fact, the "sound barrier" that once plagued scientists on Earth for a long time is not a big problem in this world, and has even been solved unknowingly - although the existing "Dragon Crane" aircraft cannot exceed the speed of sound, some acceleration flight devices created by Rebecca in a laboratory environment have successfully broken through this barrier several times.

Laboratory data shows that the wind-type force field spells originating from the elves can almost perfectly solve a series of problems caused by atmospheric drag. Although the "Dragonist" and some other flying machines have no aerodynamic concept in Gaowen's eyes, the visible parts of those aircraft are not their real "aerodynamic shells" when flying at all. What really deals with the atmospheric environment is a layer of force field surrounding the aircraft. The force field has perfect aerodynamic characteristics and can even eliminate the problems such as shock waves that need to be faced during supersonic flight. In addition, the powerful power brought by the Dragon Propulsion Array, the aircraft in this world is countless times simpler than Gaowen once imagined.

Of course, this does not mean that the technology to break through the sound barrier itself is simple - the elves' wind element force field spells have a history of thousands of years and have experienced a long and arduous research and development process. It only happens to play an unexpected function in the magic technology system, but this technology itself does not fall from the sky.

In any case, the speed of sound is not the real difficulty that blocks the technology of Cecil aircraft. The real difficulty... is that after breaking through the speed of sound, it is the mysterious missile limit, or in the words of the elves, it is called the "physical flight speed barrier".

And Gao Wen knew nothing about it.

He could only start from intuition and existing experimental phenomena and judge that this speed barrier has a high probability that it has nothing to do with factors such as air resistance, air shock waves, etc. It may involve certain characteristics of the magic environment in this world, and may even involve some more essential issues.

"The tests we have done in the Origin Laboratory have already had a very serious deviation from the experimental results in the real world," Rebecca said boldly, "In short,... the missile limits of the real world exceed the scope that the Origin Laboratory can 'understand'. So I plan to focus on the next tests about high-speed aircraft on the real world."

"Correct judgment," Gao Wen nodded slightly, "Then what ideas do you have next?"

Rebecca looked at Maggie next to her, then looked at Gao Wen carefully, and after obvious hesitation, he took a step forward with courage: "I want to try to use shells to test this speed limit..."

Gao Wen raised his eyebrows: "Candy shell?"

"It's not really a shell, but the principle is similar," Rebecca waved his hand. "Now all our tests are putting propulsion devices on the aircraft, and the results are also obvious. When the speed is approaching the limit of the missile, those propulsion devices are almost scrapped, so I plan to change my mind and use a fixed propulsion device to launch a powerless entity to see what happens...

"In this way, the propulsion device itself does not involve the speed limit, and in theory it will not be affected by the 'magic quagmire'. It should be able to continue working until the end, accelerating the flying entity to the limit that the device can withstand.

"Of course, there are many birds and beasts in nature that do not have magic power. Their speed cannot break through the missile limit, but I think this is just because their flesh and blood body has its limit - if a solid shell is made of steel, the situation will definitely be different."

Gao Wen's originally slightly frowning brow gradually stretched out with Rebecca's remarks. He listened to the other party's thoughts with interest: "What do you plan to do specifically?"

"I want to build a larger acceleration track, use more, more powerful repulsive devices, and use a stronger overloader. If necessary, the track can even be a one-time shot - I want to use it to fire a shell, which does not carry any magical effects except wind runes. I want to see if it can break through the missile limit in this way."

Gao Wen rubbed his chin with his fingers and began to take the initiative to help Rebecca improve his ideas: "Then have you considered that the wind runes on the shells will also be affected when they approach the limit of the missile, which will lead to the magic quagmire "trapped" the shells?"

"So the acceleration track must be long and the rune power must be high. Even if the wind-type runes on the shell are disintegrated, the acceleration track must continue to push the shell forward," Rebecca said immediately. "If it really doesn't work, we will build a vacuum pipeline to install the entire device, so that the wind-type rune can be simply removed and the shell can be simplified into an iron lump. In addition, the vacuum environment may lead to better acceleration effects..."

Without surprise, this iron-headed girl gave up a very powerful idea of ​​miracles.

But Gao Wen has to admit that Rebecca's idea of ​​"making a miracle" is indeed very reasonable, and it is also the best idea at this stage. Even if he makes some suggestions and optimizations next to him, he can only do some repairs on this idea.

However, after briefly thinking, he still said casually: "It's just a problem. The cost of doing this is probably not low. Have you told Herty?"

"Not yet," Rebecca immediately touched his head, his voice being 20% ​​smaller. "Such a large set of acceleration tracks, coupled with supporting energy supply, observation, safety facilities, and maybe a vacuum shell must be built. After the cost is calculated, it will probably be chased by my aunt... So I came to you first, want to..."

Her voice became smaller and smaller, and in the end she simply turned into a murmur.

Looking at Rebecca, who was uneasy and nervous when he looked at the conspiracy in front of him, Gao Wen couldn't help laughing. In the other party's surprised gaze, he nodded: "I have already permitted this project, licensed."

"Rebecca stared at her eyes as if she was still unable to believe it, "You just allow it?"

"This project is very important, and the results produced in the later stage may exceed everyone's expectations. I think it is necessary to increase investment," Gao Wen said with a smile. "But I also have some suggestions. We can ignore the vacuum shell first. By optimizing the shape of the 'cannon shell' itself, we will..."

An invisible wind suddenly blew into the study room, and a familiar breath appeared at the desk. Gao Wen stopped immediately and looked at the seemingly empty side: "What's wrong? Come over so panickedly."

Rebecca and Maggie had already guessed the person who came when they saw Gao Wen's reaction. Amber's figure indeed emerged from the air the next moment. The latter nodded to Rebecca and the others, then leaned down in Gao Wen's ear and whispered a few words.

Rebecca saw that her always majestic and reliable ancestor had a noticeably stiff expression in the next few seconds.

The next second, Gao Wen stood up suddenly, with a solemn expression.

"Rebecca, I have approved the project. You can start preparing your accelerator," Gao Wen said quickly, and looked at Maggie next to him, "Maggie, I need you to help."

Maggie immediately lowered her head: "Of course, you just want to give it."

"We are going to the Holy Spirit Plain, Solin Castle immediately."

Rebecca vaguely noticed something from Gao Wen's attitude and immediately asked, "My ancestor, what happened?!"

Gao Wen looked at Rebecca quietly, took a breath, and then slowly exhaled.

"Norris is critically ill," he said slowly.

"Norris?" Rebecca's eyes widened in an instant. At first, it seemed that she had not understood the meaning of the ancestor's words. She only realized two seconds later and subconsciously took a step forward, "I want to..."

Gao Wen looked at Rebecca and looked at the stubbornness that suddenly appeared in the other person's eyes - this child's usual personality has some problems, but she rarely appears like this stubborn and willful attitude when facing Gao Wen or Hetty.

He recalled that Norris was born from the old Cecil and was one of the eight hundred people Rebecca saved from his death.

Norris, who was a farmer, could eventually become the empire's Minister of Agriculture, which was also inseparable from the recommendations of Hetty and Rebecca.

After a moment of silence, Gao Wen nodded: "Yes."

Rebecca showed a clear relief expression and immediately smiled and expressed her gratitude to her ancestors, but soon her smile disappeared again, and expressions of sadness and worry spread across her face.

Gao Wen's brows gradually frowned. He recalled the news from Solinburg in recent times, thought about some of the things the other party mentioned during the last time he spoke with Belltila, and gradually fell into deep thought.

After a moment, he nodded slightly to Amber beside him: "You go to the North Shore..."

It is said that resurrection from the dead is a miracle.

Gao Wen felt that he had achieved this miracle.
Chapter completed!