This civilization is very strong, but the technology tree is a bit crooked

"etc!"

Jinling University.

Because Jinling is not within the range of the lift-off route, Shao Kaiwang did not prepare a space telescope this time, but got together with Wu Ande, Lin Qian and others to watch the live broadcast.

When he saw that Chen Yi started to accelerate at full speed, and the tail flame of the moon landing drone skyrocketed and lengthened several times, Shao Kaiwang subconsciously looked at the display speed and atmospheric pressure altitude on the avionics interface.

It doesn't matter.

When seeing the soaring speed value, Shao Kaiwang immediately realized something was wrong.

"The number and speed of the Mach rings of this tail flame are wrong!" Shao Kaiwang shouted.

"It's really wrong, there are too many Mach rings."

Lin Qian roughly counted the number of Mach rings, and then compared the speed and high speed of the drone to confirm Shao Kaiwang's opinion.

The Mach ring is a bright and dazzling halo formed in the exhaust of jet engines, rocket engines, and ramjet engines working in the atmosphere.

Professional description.

The Mach ring is a standing wave phenomenon formed by the interference of compression waves and expansion waves in the supersonic exhaust of the engine.

The air inside the supersonic engine will form a low-pressure high-speed exhaust gas after doing work, or tail flame, which is ejected from the engine nozzle.

Because the pressure of the exhaust gas is lower than the external atmospheric pressure, it will be compressed by the surrounding air after leaving the nozzle.

When compressed to a certain extent, the exhaust gas will expand again, and after expansion, it will be compressed by the ambient air again.

In the process of reciprocating expansion and compression, the supersonic tail gas will generate a series of complex shock waves.

Such as Prandtl-Meyer expansion wave, Prandtl-Meyer compression wave, oblique shock wave, normal shock wave and so on.

These complex shock waves will cause the temperature at the junction of exhaust gas expansion and compression to rise sharply, ignite the remaining fuel in the exhaust gas, and form circles of obvious halos.

These halos are the circles of Mach rings that are usually seen in the exhaust flame of the engine.

According to the formation principle of the Mach ring, it is not difficult to guess.

The number of Mach rings is related to the speed of the aircraft, and at the same time is related to the ratio of the pressure of the jet to the atmospheric pressure of the surrounding environment.

Some professionals can roughly calculate the efficiency and specific impulse of the engine through the aircraft's atmospheric pressure altitude, speed, and the number of Mach rings in the tail flame.

But now, the number of Mach rings in the tail flame of the lunar landing drone obviously does not match the current speed and altitude of the drone.

If calculated in reverse according to the number of Mach rings.

The efficiency and specific impulse of this moon landing UAV engine will surpass any current jet engine.

Even beyond the efficiency limit of current jet ramjet and rocket engine theory.

"There's something wrong with the engine on this moon landing drone."

Shao Kaiwang clicked on the screenshot, zoomed in on the image of the drone's engine nozzle, and found the picture taken before Chen Yi accelerated with all his strength and before the tail flame exploded.

After careful comparison, Shao Kaiwang was sure.

There's something wrong with the engine on this moon landing drone.

Not any of the current common turbojet ramjet and rocket engines.

From the engine nozzle of the lunar landing drone, a black cone protruded obviously.

"this."

At this time, Lin Weijie seemed to think of something, pointing to the small cone protruding from the engine nozzle of the lunar landing drone: "Should it be a rotating detonation engine?"

Rotating detonation engine?

Everyone was stunned for a moment, and then reacted immediately.

The engine structure with a protruding cone is indeed the nozzle structure of the rotary detonation engine.

"It is indeed the nozzle structure of the rotating detonation engine, but isn't this engine still in the laboratory stage?"

Wu Ande spit along: "Why does Yifei come up with mass-produced products and even make drones?"

"Wangwang, where did you find the fairy UP master?"

Lin Qian looked at the live broadcast and listened to Chen Yi's voice explaining while controlling the drone, admiringly said: "No wonder, he dared to talk about landing on the moon with a drone."

"I don't know either. I've watched his videos before, and I can't see how powerful he is."

"Right now we're not sure if this is really a rotary detonation engine, no amount of guesswork is going to help."

Shao Kaiwang was also a little puzzled.

As he said that, he turned on Weixin, intercepted a video of the moon landing drone's launch, and sent it to his mentor, an academician professor who is unparalleled in the country, together with the screenshot just now and a few people's guesses.

"Teacher, I found a video of an aircraft test flight. The engine used is suspected to be a rotary detonation engine. Check it out."

It took less than ten seconds for the message to be sent.

A phone call with no number displayed, obviously confidential, came.

Looking at the phone, Shao Kaiwang suddenly felt his scalp tingle, and reached out to answer the phone.

"Hello."

"Which lab is this confidential video from?"

"Where are you now, don't show the video to others, I'll go over immediately!"

On the other side of the phone, a series of urgent but familiar inquiries rang.

Hearing this voice, Shao Kaiwang immediately relaxed, and hurriedly replied: "Teacher, it's not a laboratory, it's a live broadcast. This is a live video. It's the live broadcast of the Yifei UP master I showed you a few days ago!"

"Live broadcast?" The professor didn't respond for a while.

"Yes, it's a live broadcast. This up master said that he will broadcast the drone landing on the moon!"

Shao Kaiwang glanced at the live broadcast and hurriedly explained to the professor: "Now the drone has flown to the middle layer and is in the stage of parabolic acceleration and separation. I will send you the live broadcast link!"

As Shao Kaiwang said, he walked quickly to the computer.

Open the live broadcast sharing option in the upper right corner, send the link of the live broadcast room to the mobile phone, and then send it to the professor.

When Shao Kaiwang sent the link to the professor.

In the live broadcast, the moon landing drone has been rising.

The fuselage also suddenly began to translate, from the ascending stage to the parabolic departure stage.

"Accelerate, accelerate!"

"Parabolic gliding acceleration, using the planet's rotation to accelerate, get rid of the planet in one fell swoop!"

"This time the UAV is so powerful. Now the speed has exceeded Mach 16, exceeding 5.4 kilometers per second, and the fuel consumption is only one-third."

"It's so strong this time, mainly because it flew strictly according to the space launch trajectory, last time?

The last time the host was Xia Jiba flying around, he didn't understand anything.

I have never seen a vertical space attack.

The focus of aerospace is speed, not height. The optimal solution is to strictly rely on the rotation of the planet and the principle of parabola to accelerate, rather than blindly rushing to height. "

"Brother Xia Jiba flying around, there is no need to ridicule like this.

The anchor can use drones to land on the moon. Do you think he didn’t understand better than you last time?

It can only be said that the purposes of the two live broadcast flights are different.

The last time was to sprint into space, and the focus was on momentum and going forward indomitably.

This time it's a moon landing, and the emphasis is on energy efficiency and acceleration in detours.

Those who say that the anchor does not understand, you really do not understand. "

"I'm not mocking, I'm just pity.

If it could fly according to the space trajectory last time, it would not be unable to enter the first cosmic speed, and could only crash at high altitude. "

When Shao Kaiwang shared the live link to the professor.

Netizens in the live broadcast room saw that the moon landing drone has entered the parabolic breakaway stage and is speeding up to get rid of the centripetal force of the planet, and they also published barrages one after another.

Some of the netizens started arguing because of Chen Yi's Xia Jiba flying around in the last live broadcast of his sprint into space.

"Okay, don't make any noise. They are all here to watch the anchor's drone land on the moon. What's the noise?"

"Now that the drone has entered the sky over Fuhai, where is our observation team in Fuhai? Cheers!"

"Cheers here! The tracking team of Fuhaixia University has successfully locked the target, the drone is flying normally, the tracking and shooting are normal, and the remote sensing signal is normal!"

Several netizens of Fuhai Xiamen ID sent out a series of tracking and shooting images.

In the image, an indigo blue sky with a hint of purple is dotted with stars, and a comet-like light and shadow is advancing.

After the image is enlarged, it can be clearly seen that a drone is spraying tail flames, covered with starlight, and rushing to the distance.

"Where is the Bay? Where is the mountaintop team in the Bay?!"

"The team at the top of the Bay, after feeding 180 mountain mosquitoes, successfully locked the target, the drone flew normally, the tracking and shooting were normal, and the remote sensing signal was normal!"

The mountaintop team in the bay waited for a few minutes, also sending out a stream of follow-up images.

As the altitude increases, the background of the image has changed from indigo to purple, indicating that the drone has entered the thermosphere.

"Wanbei! How's the situation in Wanbei?"

"Everything is normal in Wanbei, the target is successfully locked, the flight of the drone is normal, the tracking and shooting are normal, and the remote sensing signal is normal!"

"Wanbei University is the last stop for netizens to track the remote sensing of drones on the moon. We will continue to track the target until the target surpasses the first speed in the universe and enters orbit around the planet!"

"Wanbei is doing great!"

"Compatriots on both sides of the strait are family members! Good job!"

In the live broadcast room, as the continuous tracking is normal, the remote sensing signal is normal.

A group of netizens and university clubs who participated in tracking remote sensing couldn't help cheering and celebrating at this moment.

After the previous two live broadcasts, they were all impressed by Yifei's drone technology and Chen Yi's technology.

This time the drone landed on the moon, while other netizens were still skeptical and shouting.

They have already prepared the shooting equipment, and completed the installation of the shooting equipment, the positioning of the shooting angle, the calculation of the route, the planning of tracking remote sensing, etc. in just two hours.

"6.85 kilometers per second, the acceleration is 10.9 meters per square second, and it is expected to enter the first speed in three minutes"

Ignoring the barrage and cheers and celebrations from netizens, Chen Yi focused all his attention on the monitoring screen in front of him, paying attention to the high-speed parameters, speed parameters, angle parameters, etc. of the drone.

"Into the sky over the Pacific Ocean, the signal of the control antenna is almost covered by the curve of the ground."

After waiting for a while, Chen Yi looked at the control antenna that was pointing to the east and placed almost at the lowest horizontal angle. Without hesitation, he waved to Qin Xiaoyu.

"The drone is lifted into the air, at an altitude of 800 meters, at an angle of 60 degrees, and accelerates to the east at supersonic speed."

3000-word chapter, a bit stuck, updated later.