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

Chapter 5 Doubt
"Several Yifei's self-media accounts have just issued a notice, saying that they will transform into a turbojet model, and it will be broadcast live tomorrow."

"Hasn't he already failed in transformation once? I still remember his old model airplane, which couldn't even fly through a duct."

"I don't know, it may be to find a new engine channel or technical support."

"Damn it, everyone, go and see Yifei's preview, the cowhide has blown into space."

"Straight up to [-] meters in the sky, Cao Cao, this picture is too real!"

"Altitude 55389, speed 612 meters per second. Is Boss Yifei's head hit by a model airplane?!"

"Old Zhang, aren't you familiar with Yifei? Do you know what's going on? @张飞空模店"

"I don't know either. In the afternoon, Yifei contacted me and said that he wanted to transfer the parts of the ducted model aircraft. I'm planning to go to see the goods tomorrow. Let's take a look at them on the spot."

Penghai City, an e-commerce aircraft model factory in the suburbs.

Because of Chen Yi's sudden announcement, several members of the factory's model aircraft dealer group also initiated heated discussions.

Yifei is the first batch of merchants in the industry.

From drones to model airplanes, it has survived for four years.

Chen Yi also has a certain reputation in the circle of model aircraft drones.

Although Yifei has gone downhill due to channel and technical problems in the past six months, there are still some people who pay attention to Chen Yi's dynamics and give them basic respect.

When a group of fellow merchants were discussing because of Chen Yi's encounter.

Jinling Aeronautical University, sophomore dormitory.

Shao Kaiwang habitually opened Shuzhan and opened Chen Yi's account.

Two years ago, it was through Chen Yi's self-media account that he learned about drones for the first time, and then further learned about model aircraft and aircraft.

In the end, the content of the video aroused my inner interest, and I chose Jinling Airlines for the college entrance examination.

Although after two years of hard study, his knowledge is much deeper than that introduced by Chen Yi's video, and he can even easily discover some wrong civil science knowledge in Chen Yi's video.

But over the past few years, it has become his habit to watch the videos and updates of Chen Yi's account.

However, today, the content of Chen Yi's account update seems a little different.

"The photos and screenshots don't seem to belong to P."

"But at an altitude of 5, the turbojet engine can't go up at all. A rocket engine with its own oxidizer is needed."

Shao Kaiwang clicked on the teaser picture sent by Chen Yi, feeling a little puzzled.

Because of the photos and screenshots sent by Chen Yi.

No matter how he looked at it, there was no trace of a P picture.

But if it is not the P picture.

The height of this 5.

Unless the rocket engine, the turbojet engine can't go up at all.

"Is it true? Just calculate the angle of the sun."

After researching for a while, he still couldn't figure out whether this was a P-map, or whether Chen Yi's turbojet model really flew to an altitude of [-] meters. Shao Kaiwang didn't bother at all, and took out a pen and paper to start calculations.

Girlfriends can lie, calculations and math don't.

"In the parameters of the screenshot, there are the latitude and longitude, altitude, and time of the model drone.

With the latitude and longitude, season information, and the curvature of the horizon, it is possible to calculate the angle of occlusion by the sea level at the current latitude and longitude after the sun sets at the time of shooting.

The photo also captured Venus, the brightest star after sunset.

Similarly, according to the season and shooting time, the visual distance and angle of the sun and Venus can be calculated.

Then when the line of sight rises from the sea level to 5 kilometers, the line of sight of the camera, the position of the sun, and Venus form a triangle, and the inner angles of this triangle are respectively "

Shao Kaiwang wrote down three numbers, then saved the photo taken by Chen Yi to the memo, and used the stroke tool to connect the sun, Venus, and the center of vision, which is the position of the lens.

Without using an angle ruler, Shao Kaiwang can tell by visual inspection that these three angles are accurate.

Fearing that his visual observation might be wrong, Shao Kaiwang took out an angle ruler, measured it several times, and then fell silent.

The measurement results cannot be said to be exactly the same, but to be completely consistent.

"God!"

"It's worthy of being the guide who put me on the aerospace vehicle! Awesome (broken sound)!"

Shao Kaiwang shouted awesome.

Opening a small team group of academy aircraft that he joined, Shao Kaiwang forwarded the link of Chen Yi's preview.

[Shao Kaiwang: Friends, I found a miraculous up master who announced a turbojet model flying directly at an altitude of [-] meters! 】

[Luo Zehai:? ? ? 】

[Wu Ande:? ? ? 】

[Lin Weijie:? ? ? 】

[Lin Qian: Wangwang, are you still asleep, a model airplane at an altitude of [-] meters? 】

[Shao Kaiwang: Really, look at the photos posted in the trailer and the parameters of the screenshots of the control interface. I calculated the angle of the sun and the angle of Venus in the photos, which are exactly the same! 】

[Shao Kaiwang: This is an up master I have been paying attention to for several years, and he is also my first teacher in the field of aircraft. The reason why I applied for our college to study aircraft is because of his influence. 】

Shao Kaiwang posted his calculation process and results.

This was the first time he introduced Chen Yi's account to his partner, and the process of getting to know Chen Yi.

He thought about sharing it before, but it was because Chen Yi's video was too eye-catching.

No, it's too civilized.

It's okay as a simple science.

But just go a little deeper and be more professional, and it's vague, or full of holes.

It made him feel embarrassed at all, and shared the introduction with his classmates.

But now, it doesn't matter what method Chen Yi uses to accomplish such a feat, using the turbojet model to go straight up to an altitude of [-] meters.

In Shao Kaiwang's heart, this is enough to make a shout out, and then share it with his friends.

fake?

Impossible to fake.

He believes that he has been paying attention to the up master product for several years, and he also believes in the results of his calculations.

[Lin Weijie: There is no problem with the calculation, the angle between the sun and Venus in this photo is really [-] meters above the sky]

[Luo Zehai: [-] meters above the sky on a turbojet model airplane. 】

[Wu Ande: I thought we were awesome enough to build rockets from scratch]

[Lin Qian: I still feel that there is a problem. Maybe the up owner pre-judged Wangwang's calculations, and calculated the angles of the sun and Venus in advance when making the P map. 】

[Shao Kaiwang: Impossible, it is impossible for this up owner to fake it. 】

[Lin Qian: Is it a fake? You'll know when you watch the live broadcast tomorrow. Doesn't his announcement mean that the live broadcast will fly into space at [-] o'clock tomorrow afternoon? 】

[Lin Qian: The weather in Jinling and Penghai these days is good, and the visibility is very high. Let's set up a space telescope to track them tomorrow. 】

[Lin Qian: As long as the model plane goes up to 6 meters, we can follow it in Jinling. This photo and video may be fake, but it is impossible to follow it with our own eyes. 】

(End of this chapter)