The drone went all the way to the west.

Soon, we came to the Baihetan Hydropower Station in the continuous mountains of the Hengduan Mountains.

The water flow from the upstream Jinsha River is cut off here by a 300-metre double-curved arch dam to form a super reservoir with a storage level of 825 metres.

Based on the calculation of a 3-meter one-story building, the dam body here is equivalent to a 100-story high-rise building.

"It deserves to be the pinnacle of the hydropower industry."

"This dam is simply a high wall."

Chen Yi controlled the drone to lower the altitude and took various photos in a circle.

Once you've taken your photos, move on.

Further on, there is the area where three rivers flow together.

Jinsha, Lancang, Nujiang, three major rivers, in the shape of Sichuan, flow from north to south.

The drone swept over the sky of Sanjiang, startling groups of black-necked cranes and black storks, leaving a smart figure in Chen Yi's lens.

"If you have time, maybe you can take an aerial photography trip."

"Using my drone to shoot is more energetic than the "Aerial Photography of the Earth" program."

Crossing the area of the three parallel rivers, Chen Yi began to enter the Himalayas.

Towering snow-capped mountains streak across the camera.

In the valleys and flatlands between the high mountains, the mysterious Brahmaputra River is flowing slowly.

Snowmelt from the Himalayas has created the world's largest river with the highest altitude and the world's fourth largest water flow.

Flew along the runoff of the Brahmaputra River for a while.

Soon, the drone came to the highest mountain in the Himalayas.

- Mount Everest.

Without waiting for the drone to land from the sky.

The infrared scanner has already scanned the small but bright red dots on the surface of Mount Everest.

Chen Yi slowed down the drone.

Avoid popping sounds generated at high speeds that can cause avalanches in the mountains.

Then, under the amazed gaze of groups of mountaineering tourists, the drone slowly descended to the top of Mount Everest like a mosaic.

"Himalayas, Everest check-in!"

Chen Yi controlled the lens of the drone and took a few photos of the stone monument of the world's first peak.

Then he took off vertically, adjusted the angle, projected the drone's shadow on the surface of the peak, and continued to take a few photos.

"I'm done, it's time to go back to sleep."

After completing the check-in goal this time, Chen Yi yawned and controlled the drone to start returning.

Vertical take-off.

After flying hundreds of meters from the top of the mountain, a dry land pulls onions.

The drone quickly rushes tens of thousands of meters into the air and then turns on the maximum thrust.

Rumble!

Sonic booms exploded across the vast sky.

The drone quickly turned into an afterimage and disappeared into the eastern skyline.

"Flying more than 5,000 kilometers, 28 percent of the battery remains......"

"Then, the next return trip will use frog jumping and gliding to maintain the balance of power."

"By the way, you can further test the aerodynamic coefficient of the fuselage, as well as the performance under extreme working conditions."

Flying away from the boundary of Mount Everest, Chen Yi looked at the remaining power, and without hesitation, he directly pulled the drone to an altitude of 40,000 meters.

Rushing to an altitude of 40,000 meters, the speed of the drone has reached Mach 5.

At this point, the horizontal tail is flipped downwards.

The fuselage begins to ascend and descend in a parabolic glide.

Then the left and right ailerons are deflected and the aerodynamics are changed.

The whole drone began to spin.

Whew!

Drones are spinning faster and faster.

In a few moments, the angular velocity of the wing broke through the speed of sound.

It began to make a crackling sonic boom like a park uncle throwing a big whip.

Wisps of sonic boom clouds, created at the edges of the wings.

But before it can be formed, it will be shattered and dissipated in the next moment, and then it will be produced and dissipated again.

Crunch! Crunch!

In Chen Yi's ears, a creaking sound began to sound.

The AR glasses in front of you, the dense flight data, and the status parameters of the fuselage are also constantly being refreshed.

"It is worthy of the carbon fiber material with a basic tensile strength of 7Gpa, and it has not been affected at all."

Chen Yi checked the status parameters of the drone and breathed a sigh of relief in his heart.

Don't look at the squeaky fuselage right now.

But this is only the resonance of the fuselage structure, as well as the difference in dynamic balance, the sound produced by the rotational flutter.

The material of the fuselage itself has not been affected in any way.

"It seems that on the basis of carbon fiber, the 8-point strength attribute has been further adjusted and upgraded."

"Today, the tensile strength of the fuselage material has reached the limit of Darwin's barking spider silk."

Chen Yi took out a pen and paper and calculated the flight data of the drone at this time.

Soon, he calculated.

In the current state of high-speed rotation, the tensile strength of the fuselage material has far exceeded the limit of steel and the limit of special glass fiber.

Under such a spin pull.

Only the strength of Darwin's barking spider silk is possible to withstand it.

"Darwin's barking spider silk is currently the second strongest material in the world and the strongest biological material in nature.

Before the invention of carbon nanotubes, Darwin's barking spider silk had dominated the top of the materials industry.

Strength and toughness, 21 times stronger than steel......"

Chen Yi recalled the parameters of Darwin's barking spider silk and thought about it: "The limit of this test can be further strengthened. ”

There are no problems in determining the strength of the fuselage.

Chen Yi immediately decided to continue to increase the intensity of the test.

Test the parameters of the drone in the limit state and expose the possible problems in advance.

Poof!

An azure glow bloomed on the wings.

The originally fast-rotating drone is under the active rotation of the fuselage.

In an instant, the rotation was even faster.

But a minute.

The drone rotated and dived from an altitude of 40,000 meters to an altitude of 20,000 meters.

At this time, the drone that rotated at super high speed seemed to have turned into a tornado.

It seems to be an enlarged version of Naruto's ninjutsu - "Tooth to Tooth", stirring up a huge cyclone.

"Damn, what is this!?"

When the drone rushed to an altitude of 20,000 meters.

More than ten kilometers away.

A Weilong fighter plane that was carrying out a separate transfer flight mission also discovered the movement of the drone.

In the stratosphere, where there are no clouds and mist, the crazy spin and dive into the drone is like lice on the head of a monk.

Even if it is 10,000 meters apart, this is clearly visible.

"0738, what did you find?"

The tower that was always in contact with the fighter plane, heard the pilot's can't help shouting, and shouted and asked for the first time.

"Report to the tower, 0738 has spotted an unknown aircraft that is spinning and falling at high speed."

"The falling speed is Mach 1.2, and the optical scan is very blurry, as if there is a mosaic.

The on-board radar could not detect the signal, and it is suspected that a new stealth technology was used. ”

"Application 0738 for close observation, please approve from the tower."

Pilot 0738 is making a quick debriefing.

At the same time, the signal image of the optical scan is transmitted back to the tower to apply for close observation.

"Approve proximity, but be safe."

"Focus on observing the direction and angle of the target's fall, and determine whether there is a residential area below."

"If there is a residential area, autonomous interception is allowed, and the safety of people's lives is the first priority."

"0738 received!"

Determining the command of the tower, the 0738 pilot did not hesitate.

The afterburner mode of the engine was turned on as soon as possible, breaking through the sound barrier, and chasing Chen Yi's drone.

Thundered!

0738 just caught up with the target.

Suddenly, a flying vehicle in front of it was spinning at supersonic speed.

Like a hedgehog, it blooms with a blue glow.

Then the speed of rotation of the aircraft decreases rapidly, slows down, and slows down.

In the area of 13,000 meters of arrival.

When the civil aviation altitude from 12,000 meters is less than 1,000 meters.

The unknown craft completely stabilized the fuselage, pulling out a full moon-like trajectory in the air.

The fuselage has changed from a swooping attitude to a pull-up state.

Immediately afterward, a violent airflow and blue glow erupted from the tail, and the entire aircraft soared into the sky......

It's fast.

It surpassed Mach 2 in one fell swoop.

Then he rushed to an altitude of 20,000 meters and an altitude of 30,000 meters, exceeding the ceiling height of Weilong.

“......”

No. 0738 was dumbfounded and hurriedly reported to the tower: "Report to the tower, the target stopped rotating at an altitude of 13,000 meters, pulled up again, and entered critical space at supersonic speed, unable to get close to observe." ”

There was silence on the other side of the tower.

Looking at the emergency plan that has just been activated, notify the nearby airport tower, as well as the air traffic control bureau, and carry out air traffic control instructions.

“..... 0738, please reconfirm your observations. ”

"Report, I'm sure!"

No. 0738 replied earnestly.

But as soon as he finished speaking, he saw the sky dozens of kilometers away.

Without the obstruction of clouds and mist, the newly unknown aircraft once again swooped down like a spinning mosaic.

“...... Reporting to the tower, it swooped down again. ”

"Please allow me to intercept in mid-air and confirm the identity of the other party."

At this moment, the tower seemed to have guessed something, and there was no response at all.

I waited a few minutes.

A new command returned.

"0738, please continue with your transition mission and ignore this unknown flying machine."

"But ......"

"It's classified."

Secret?

No. 0738 was shocked.

Looking at the unknown flying machine in the distance that began to stop spinning like a hedgehog again, and then pulled up again like a frog, his eyes showed deep shock and anticipation.

Could it be that this is a new fighter that is being tested and flown off?

But what kind of fighter plane, it needs to use such a rotating frog jump test flight method.

...... That's too violent, isn't it?