The moon of fire is coming, and the sun is in the sky.

Even in this country located in the north of the continent, some areas are beginning to have a "hot summer" feeling.

Gawain turned the information in front of him to the last page, the charts and data on the data slowly settled in his mind, and after a few seconds of thinking, he raised his head and looked at Rebecca and Maggie in front of him: "So the last few attempts to break through the 'missile limit' have failed?" ”

“…… Yes, it all failed," Rebecca said with her head down, particularly frustrated, "whether it's increasing the thrust of the drive array or changing the layout of the wind field, all the methods are useless. I've compiled a detailed record of each failure, the ones you just saw. ”

"Hmm...... I see," Gawain frowned, his gaze swept over the stack of papers that he had placed on the table, a long-lost sense of uncertainty and contradiction seeping through the lines of the papers, stirring his high-speed mind, "and all the tests encountered similar problems in the final stages of the acceleration...... The magic field that maintained acceleration was suddenly greatly disturbed, and the output plummeted, and the aircraft slowed down accordingly......"

"It was like suddenly crashing into a chaotic and extraordinarily powerful 'magic quagmire,'" Maggie, who had personally carried out most of the test flight missions, immediately reported how she felt at the time, "No matter how much effort I maintained before, it would quickly be disintegrated by that quagmire, and the speed would not be able to go up." ”

Gawain fell silent for a moment, pondering in silence.

The missile limit, the speed limit that all physical projectiles will face, after approaching this limit, the projectile will be captured by an invisible but powerful "quagmire", if it is a magic-driven flying device, then it will appear as the magic field that maintains the thrust will be disintegrated, if it is a bird or beast in nature that does not rely on magic to fly...... Although the reason is not clear, they are invariably unable to break through this "barrier".

It's a familiar phenomenon, so familiar that Gawain can't help but think of the difficulty that high-speed vehicles on Earth once faced: the sound barrier, and yet......

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

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

The northern realm is the magical holy land of Ansu in the past, due to the influence of the Wilder family, a large number of excellent mages and scholars are concentrated in that cold place, and in order to explore the mysteries of various magical phenomena, even the mages of the old era will do a series of studies on nature, so concepts such as atmospheric sound speed, air pressure, melting and boiling point of various substances, etc., have always been there among the upper intellectuals, and the data is still very accurate.

At the moment, one of these exact numbers ...... It stirred Gawain's nerves like a nasty little devil.

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

The speed barrier encountered by Rebecca's aircraft is not a sound barrier, but something else that is completely unknown.

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

Laboratory data shows that the wind force field spell derived from the elves can almost perfectly solve a series of problems caused by atmospheric drag - although the "Dragoon" and some other flying machines have no concept of aerodynamics at all in Gawain's eyes, the parts of those aircraft that are visible to the naked eye are not their real "aerodynamic shells" when flying, and what really deals with the atmospheric environment is a layer of force field around the aircraft, and that layer of force field has perfect aerodynamic characteristics, It can even dissolve the shock waves and other problems that need to be faced when flying at supersonic speeds, and coupled with the powerful power brought by the Dragon's Propulsion Array, it is far easier for the world's aircraft to break through the sound barrier than Gawain once imagined.

Of course, this doesn't mean that the technology itself is rudimentary - the elves' wind elemental force field spells have a history of thousands of years, and have gone through a long and arduous research and development process, and it just happens to play an unexpected function in the magic technology system, but the technology itself did not fall from the sky.

In any case, the speed of sound is not the real difficulty, the real difficulty, that stands in the way of Cecil's aircraft technology...... It is after breaking through the speed of sound that it is the mysterious missile limit, or in the Elven parlance, the "physical flight speed barrier".

And Gawain knew nothing about it.

He could only judge from his intuition and existing experimental phenomena that this speed barrier had a high probability of nothing to do with air resistance, air shock wave and other factors, and it might involve some characteristics of the magical environment of this world, and even some more essential problems.

"At present, the tests we have done in the Origin Lab have been very different from the results of the experiments in the real world," Rebecca said boldly after seeing that Gawain had not spoken for a long time, "In short, it is...... The limits of real-world missiles are beyond what the Origin Lab can 'understand'. So I'm going to focus my next experiments on high-speed vehicles in the real world. ”

"Correct judgment," Gawain nodded slightly, "then what do you think next?" ”

Rebecca looked at Maggie next to her, then cautiously glanced at Gawain, and only after obvious hesitation did she boldly take a step forward: "I want to try to test this speed limit with cannonballs......"

Gawain raised his eyebrows: "Cannonballs? ”

"It's not really a shell, but the principle is pretty much the same," Rebecca waved her hand, "Now all of our tests are to put the propulsion on the aircraft, and then the results are obvious, when the speed is close to the limit of the missile, the propulsion is almost scrapped, so I'm going to change my mind and use the fixed propulsion device to launch an unpowered entity and see what happens......

"In this way, the propulsion unit itself does not involve a speed limit, and theoretically is not affected by that 'magic quagmire', and 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 don't have magical powers, and their speed can't break through the limits of missiles, but I think it's just because their flesh and blood have limits - if you make a solid cannonball out of steel, the situation will definitely be different."

Gawain's originally slightly furrowed brow gradually relaxed as Rebecca spoke, and he listened to the other party's thoughts with interest: "Then what are you going to do?" ”

"I want to build a bigger acceleration track, with more and more powerful repulsion devices, with more powerful overloaders, and if necessary, this track can even be disposable - I want to use it to fire a cannonball that doesn't carry any magic effects other than wind runes, and I want to see if it can break through the missile limit."

Gawain rubbed his chin with his fingers and began to take the initiative to help Rebecca refine his thoughts: "Then have you considered the situation where the wind runes on the cannonballs will also be affected when you are approaching the limit of the missile, causing the magic quagmire to 'trap' the cannonballs?" ”

"So the acceleration track must be long, the rune power must be large, even if the wind rune on the cannonball disintegrates, the acceleration track must continue to push the cannonball forward," Rebecca said immediately, "It's really not possible, let's build a vacuum pipe to house the whole device, so that we can simply remove the wind rune, so that the cannonball can be simplified into an iron lump, plus the vacuum environment, maybe we can get a better acceleration effect......"

Not surprisingly, this Iron Maiden threw out a rather powerful idea of a miracle.

But Gawain had to admit that Rebecca's idea of "making a miracle with great force" is indeed very reasonable, and it is also the best idea at this stage, even if he makes some suggestions and optimizations on the side, he can only make some tinkering on this idea.

However, after a brief thought, he still mentioned it seemingly casually: "It's just a question, I'm afraid the cost of doing this is not low, have you told Herty?" ”

"Not yet," Rebecca immediately touched her braincase, and her voice was two percent smaller, "Such a large set of acceleration tracks, plus supporting energy supply, observation, and safety facilities, and may have to build a vacuum shell, after the cost is calculated, there is a chance that my aunt will chase and beat it...... That's why I came to you first, I wanted to ......"

Her voice grew quieter and quieter, and at last it simply became a person's muttering.

Looking at Rebecca, who was uneasy when the conspiracy was exposed, Gawain suddenly couldn't help laughing, and in the surprised gaze of the other party, he nodded: "I have already licensed this project, charter." ”

"Really...... It's true? Rebecca glared as if she still couldn't believe it, "That's what you for?" ”

"This project is very important, and the results that will be produced in the later stage may exceed everyone's expectations, and I think it is necessary to invest more," Gawain said with a smile, "but I also have some suggestions, we can ignore the vacuum shell for now, and by optimizing the shape of the 'cannonball' itself, we can ......"

An invisible wind suddenly blew into the study, and a familiar breath appeared next to the desk, Gawain immediately stopped and looked at the seemingly empty side: "What's wrong?" Come here in such a panic. ”

Rebecca and Maggie had already guessed who was coming when they saw Gawain's reaction, and Amber's figure emerged from the air the next moment, and the latter nodded briefly to Rebecca, then leaned down next to Gawain's ear and whispered a few words.

Rebecca saw that her ancestor, who had always been majestic and reliable, had a noticeable stiffness in his expression for the next few seconds.

In the next second, Gao Wen stood up with a solemn and scary expression.

"Rebecca, I've approved the project, you can start preparing your accelerator," Gawain said quickly, looking at Maggie on the side, "Maggie, I need your favor." ”

Maggie immediately lowered her head: "Of course, you just command." ”

"We're going to the Plains of the Whitsunday, Fort Solin."

Rebecca faintly sensed something from Gawain's attitude, and immediately asked, "Ancestor, what happened?!" ”

Gao Wen glanced at Rebecca quietly, inhaled slowly, and slowly exhaled again.

"Norris is critically ill." He said slowly.

"Norris?" Rebecca's eyes widened instantly, as if she hadn't understood the meaning of her ancestor's words at first, but after two seconds she reacted and subconsciously took a step forward, "I'm going to ...... too"

Gawain looked at Rebecca and looked at the stubbornness that suddenly appeared in the other person's eyes - this kid usually has some problems with her personality, but she rarely has such a stubborn and willful attitude when facing Gawain or Hetty.

He recalls that Norris was from Old Cecil, one of the eight hundred people that Rebecca had saved desperately.

Norris, who was born as a farmer, was able to eventually become the empire's Minister of Agriculture, which was also inseparable from Hetty and Rebecca's recommendation.

After a moment of silence, Gawain nodded, "Yes." ”

Rebecca was visibly relieved, and immediately smiled and thanked her ancestors, but soon her smile disappeared again, and a look of sadness and worry spread across her face.

Gawain's brow furrowed, he recalled the news from Solimburg some time ago, and thought about some of the things mentioned by the other party during the last call with Bertilla, 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 it is a miracle to come back from the dead.

Gawain felt that he had achieved this miracle.

So...... Maybe it's time for him to do another miracle.