I Created Scientific Magic-Chapter 625 - 529 Let’s set a small goal first, to break through Mach 5!_2

"Brilliant, truly a marvelous idea..." Dennis said excitedly. Originally, he had planned to immerse the combustion chamber in a bath of cold liquid to achieve a cooling effect, but Lynn’s design was clearly more energy efficient, because the air came directly from the airstream of the fighter jet during flight.

Lynn sketched and scribbled, incorporating many ideas into the design. The thruster, after several revisions, came to resemble a patchwork monster.

But as long as it was useful and efficient, that was all that mattered!

Whatever was convenient was the way to go!

"Why does this thruster structure look so strange?" Dennis glanced over Lynn’s revised blueprints and asked, quite perplexed.

The design looked like two funnels put together end to end, with their narrow parts joined together.

"This is the most fluid dynamic structure I’ve researched recently. I expect it to double the speed of the airflow and liquids passing through the duct without a problem!" Lynn’s lips curled into a smile as he explained. This structure was actually the famous de Laval nozzle, also known as a supersonic ejector.

Dennis frowned as he looked at the blueprint. He believed in optimizing the structure of the thruster duct to increase speed, but the idea that merely changing one structure could double the existing speed seemed a bit exaggerated.

Keep in mind, his explosive thruster could already reach speeds of seven hundred kilometers per hour, and with the step of compressing the gases, the speed would only increase!

To think that it could double from such a base—what kind of concept was that?

Dennis found it hard to imagine how this horn-shaped structure had anything special about it that could have such a significant effect.

"Will it work? There’s only one way to find out," Lynn said with a laugh, equally curious as to what degree this patchwork thruster could perform.

Dennis nodded, not wasting any more words, and rolled up his sleeves to get started on the thruster improvements.

Lynn wasn’t idle either, taking charge of making the pressure-bearing third air chamber himself, and even called over Tim, who was standing by.

The Great Wizard possessed atomic-level control abilities, capable of manipulating, analyzing, and mimicking nearly all elements except for special ones, rendering him incredibly efficient in engineering tasks.

Even with the inscription of the Alchemy Array, the modification of the new thruster was completed within two hours.

Then it was time for the experiment!

All the alchemists and the half-humans like Darren immediately retreated to a safe distance. Perhaps because he had been involved in the construction, Tim wasn’t as nervous as before.

Dennis carefully placed his hand on the magic power transfer device. As the magic power rushed in, the thruster was reactivated.

A tremendous roar quickly rose to everyone’s ears, followed by a jet of crimson flame shooting out from the rear nozzle of the thruster.

The platform used to secure the thruster trembled continuously. Had it not been for the reinforcements Lynn had specially made, the thruster would have probably flown away at that moment!

"Such intense exhaust flames..." Dennis said in amazement. The high-temperature flames shooting out of the nozzle had been focused into a two-meter-long column of fire, even longer than the thruster itself!

Even with the naked eye, he could tell that the thrust provided had increased by several levels compared to before.

As everyone watched, the indicators on the thrust detection device climbed higher and higher...

Six hundred, seven hundred, eight hundred, nine hundred... and then it stopped moving.

"Master Dennis, it may have exceeded the limits of what we can detect!" An alchemist said in astonishment.

This means that the maximum velocity of the jet stream had exceeded one thousand kilometers per hour!

After a dozen seconds of building up momentum for acceleration, the shape of the high-temperature jet stream shooting out from the nozzle underwent another change, with the flames near the nozzle slightly indenting inward. This area of the flame was much brighter than the rest, forming a ring shape, trembling slightly...

Lynn didn’t wait for everyone to ask and proactively began to explain. "This is a sound speed ring, signifying that the velocity of the jet stream had surpassed the speed of sound!"

The pressure of a supersonic jet stream is very high, so when it is injected into the air from the nozzle, it will expand rapidly, but the pressure of the expanded jet stream will then be notably lower than atmospheric pressure, therefore it will be compressed again.

As a result, the supersonic jet stream will oscillate between expansion and compression; this process will form expansion waves and compression waves. When these waves meet and superimpose during propagation, they form each ring on the tail flame of the propulsion unit, also known as the sound speed rings or Mach rings!

Because the mixture of hydrogen and oxygen combustion forms a steam flow that increases the humidity of the nearby air, these colorful sound speed rings appeared particularly distinct.

"The appearance of one ring represents one times the speed of sound!" Lynn looked towards the continuously surging tail flame; a second sound speed ring had not emerged. "Alas, it still hasn’t reached twice the speed of sound, but I think it must be very close now..."

According to his expectations, after the step of gas compression, the high-temperature jet stream from combustion would reach subsonic speeds before entering the Rava nozzle. After twice accelerating through the Rava nozzle, it should be able to reach around twice the speed of sound, but unfortunately, it was just slightly short.

"President Lynn, you mean to say, the velocity of the high-temperature jet stream is now exceeding two thousand kilometers per hour?" Tim said incredulously.

Although the speed of sound varies with different air pressures and temperatures, the average is around three hundred forty meters per second, that is, twelve hundred kilometers per hour!

And approaching twice the speed of sound also implies surpassing two thousand kilometers per hour…

Tim clicked his tongue in amazement. What kind of monster were they trying to create?

Even Dennis found it hard to believe. Even though he had guessed that the propulsion unit’s power would undergo a qualitative improvement after their modifications, he didn’t expect it to be this fast.

"Dean Lynn, can you fly that fast?" Lydia asked curiously.

"Not for the moment..." Lynn shook his head; his flying speed was about one and a half times the speed of sound.

"Doesn’t that mean, as long as one pilots this fighter jet, even legendary Wizards won’t be able to catch up with me?" Lydia said with anticipation.

"That’s hard to say." Lynn smiled, but to prevent Lydia from becoming overconfident, he threw cold water on her. "Some magic spells are very fast, like my electromagnetic railgun, which can reach more than twenty times the speed of sound. If it were a laser beam, you probably wouldn’t even have a chance to dodge."

Lydia imagined herself piloting the fighter jet, targeted by several laser beams, and she instinctively shrank her neck.

Lynn then had Dennis stop the operation of the propulsion unit and to disassemble it to search for which part was affecting the jet stream’s velocity reaching its limit, and continued to improve the internal structure.

"More improvements?" Tim’s mouth twitched involuntarily, as the rapid velocity filled him with a tinge of fear, completely beyond his imagination.

In the past, the speed of sound was a domain only legends could reach, symbolizing the breaking of the sound barrier, breaking through nature’s limits.

In his view, such speed was already quick enough!

"It’s only close to twice the speed of sound, it still hasn’t reached the limit of the jet propulsion unit!" Lynn said with a laugh.

For jet fighters, three times the speed of sound is not much, five times the speed of sound is acceptable, and ten times the speed of sound is just enough to be deemed adequate…

"Furthermore, the shape of the fighter jet also needs to be optimized more. Supersonic and speeds below the speed of sound are two completely different concepts. A fighter jet at super high speeds will drive the surrounding air to accelerate its flow, compressing the air, forming a shockwave face at the plane’s front-facing windward side..."

Lynn explained to Dennis the various obstacles a fighter jet would encounter during high-speed flight, and sketched out the design drawings for a simple wind tunnel, in order to simulate the airflow state during supersonic flight.