Short video spoiler history: The beginning of modern warfare

Chapter 107 Drone

"What a wise ruler! But he died too late"

Li Longji Calls an Expert

"Sixteen palace maids lost an opportunity to extend the life of the Ming Dynasty for 200 years."

Zhu Yuanzhang looked at the ridicule in the comment section, and his anger, which had just calmed down, was raised up again: "That damn beast, he didn't do any of the important things he should have done, but did all the bad things!"
The grandfather and grandson did not attend the court for more than 50 years in total. How could the Ming Dynasty not fall? No wonder the imperial power fell into the hands of others and the eunuchs came to power.

With such a bunch of extremely stupid and unworthy descendants, no matter how much he did or how good the system was, what was the use? How could an empire withstand such extravagance and harm?

The imperial doctors serving on the side listened to his majesty's heavy breathing and the crackling of his knuckles. Although their expressions varied, they all hoped in their hearts that Tianmu would skip this video as soon as possible and stop irritating his majesty.

Symptoms like this of mixed worry and anger are caused by a mental illness. If Your Majesty really falls ill, they are helpless and can only prescribe some sedatives. Whether the patient can recover depends mainly on his mood and whether his worries have been relieved.

In this situation, if something went wrong with His Majesty, it would naturally be difficult for the imperial doctors in charge of the treatment.

In mild cases, you can just confess here, but if you encounter unreasonable people, it may bring disaster to your family.

"Why should workers make things difficult for workers?" Imperial Physician Li laughed at himself, this situation was indeed the same as that of the young men who called themselves workers, cautious, treading on thin ice, and at the same time a little humble.

Fortunately, the screen finally changed again. As soon as he saw the title, Imperial Physician Li knew it was no longer a video mocking the future emperor of the Ming Dynasty.

"Bless the Buddha!"

[The reason why boys don’t like to post on WeChat Moments has been found. #FriendsCircle]

[Finally I know why boys don’t like to post on WeChat Moments. Just look at the following examples]

[Post: I hope someone can pick up the pieces of me; Comment: Were you dismembered? ]

[After drinking, I posted a circle of friends, and then I opened it the next day and saw all the comments: I’m just afraid that I will destroy my sincerity with my own hands.]

[The room leader posted an emo post in the middle of the night, we saved it, and read it aloud together in the class meeting. Later, we no longer had the permission to view their Moments]

[Last time, our dormitory head got drunk and said: There will always be regrets in life, and she is my regret. From then on, the motto of our dormitory is: There will always be regrets in life [狗头]]

[Post: It’s only been a few days since I came here and the dog is already pregnant; Comment: Brother Bo, you are quite capable]

[Post: Turning the tables when the odds are against you is always more addictive than turning the tables when the odds are in your favor; Comment: Oh, isn’t this addictive, brother? You turned the tables again? ]

In Jinling City, the atmosphere in front of the Fengtian Palace eased a little, and everyone's faces were no longer tense.

In the Department of Science, since most of them were promoted from the Imperial College, they are of similar age to the young people in the Sky Curtain. Although there are hundreds of years between them, it seems that the feeling of being a little shy in the personalities of their classmates is similar.

Du Ping couldn't help but think of his two bad friends, one of whom was selected to be included in the Yellow Book, and the other was sent to do breeding work.

They do owe each other a little, but it's been such a long time since we last met in the blink of an eye. I still want to know how they are doing. It would be great if I had a steam train and a circle of friends.

Among the military generals, Xu Da could not really understand the thoughts of the younger generations. When he was his age, he had already been called up to join the army and fought in the battlefield. He had experienced life and death over the years and had at least a hundred or eighty scars on his body. Every day he was either busy chopping people or being chopped by others, so he had no time to feel sad about the passing of time.

Except for the people in the science department who are accustomed to getting to the bottom of everything they encounter, everyone else was amused by calling him "Addicted Brother" and "Sunny Brother".

Just from the comments section, everyone could feel the sarcastic atmosphere, and a group of generals said that the way scholars speak is different, and they have brought the art of language to full play.

Like: In My Life is Like Walking on Thin Ice, "Hey, isn't this our Brother Thin Ice?"

If we can get wet in the snow together in this life, we can also be said to each other as we grow old together.

Xu Da thought about it and thought that if he posted a similar message on WeChat Moments, his fellow soldiers might think that he was forced to post it after being captured by the Mongolian Tartars.
"If you touch your body too early, your soul will not be touched. Comment: Hello, Soul Brother"

"How much alcohol is enough to match the sudden sadness. Comment: Hello, Sad Brother"

The sky screen switched again, but it started with a black screen, and then a few words slowly zoomed in: "This is Nanjing you have never seen before"

Next is a steel bridge across the river. The bridge is divided into two levels, the upper level is paved with cement road where cars run, and the lower level is paved with rails where trains run.

The bottom of the bridge is supported by 9 huge piers, with one standing not far away. As the camera slowly zooms in, you can see how huge they are.

From the subtitles, we know that this is the Nanjing Yangtze River Bridge.

In Jinling City, everyone stared with wide eyes, watching the train slowly passing by under the sunset and entering Nanjing.

"Is this the Jinling City of later generations?" Zhu Biao and others all knew that Jinling (Yingtian) was changed to Nanjing City in later generations. It was probably to correspond to Beijing, with a layout of one south and one north, just like the two capitals of the east and west in the Tang Dynasty.

Hu Weiyong, Liu Ji and others remained silent, their eyes following the rotation of the sky, unwilling to miss any scene.

Zhu Yuanzhang's mood was not so heavy after watching the previous video. At this moment, looking at the wrinkled Yangtze River, the towering bridge, the slightly drunken sunset, and the barrage of "the literary center of the world, the literary capital of the world", the shock and emotion in his heart were beyond words.

In Jinling City, countless people were stunned by the beautiful scenery, and when they asked around, they were even more excited when they learned that this was Jinling under their feet. Then there were the two tilted ring-shaped suspended bridges, the "Nanjing Eye Pedestrian Bridge", the "Ancient Jiming Temple", the "Purple Mountain", and the "Shijiu Lake".
[The above are the aerial photography materials of Nanjing that I found on the Internet. As we all know, drones have been very popular in recent years, and their role depends entirely on personal imagination]

[For example, some people use it for aerial photography, and the effect comes out immediately, such as when the sect is in trouble, rush back to rescue, a perfect example of flying with a sword; some people use it to apply fertilizer and pesticides, a small team of two or three people can work on hundreds of acres a day, which greatly improves efficiency; of course, it is also used in the military]

[From a structural point of view, they are both aircraft, so why do the drones designed today seem to have nothing to do with the airplanes and helicopters that were designed before? ]

[In fact, the original design of the drone did work like a helicopter, using a single propeller to lift and lower. However, this single propeller design actually has a problem.]

[According to Newton's third law (forces act mutually), when a helicopter is taking off or landing, the torque generated by the rotation of the motor rotor will transmit its reaction force to the fuselage]

[So in actual flight, we will find that the helicopter will rotate in the opposite direction of the propeller in the air. The solution is also very simple, which is to add a tail wing to the helicopter]

[Back to the drone, since the drone is relatively small, there is no way to install a tail wing. Without a tail wing, it cannot maintain balance in the sky.]

[But fortunately this is not a big problem. You just need to change one propeller into two. If you observe carefully, you will find that on this kind of dual-propeller drone, the two propellers rotate in completely opposite directions.]

[The function of the propeller blades is actually just to provide lifting force. Its shape is somewhat similar to the wings of an airplane, and the take-off principle is similar. Using two propeller blades with different rotation directions can offset the effect of the motor torque on the fuselage.]

In front of Fengtian Hall.

Everyone is so anxious that they are just about to start immersing themselves in the beautiful scenery of Jinling City, and now you tell me this is an aerial photo?

And talking seriously about drones?
The clerks wailed a little, regretting that they had not seen enough of Zhongshan Mountain and Jiming Temple, but they quickly got into work mode and immediately started writing down what Tianmu had said.

Zhu Yuanzhang saw the drone, which was slightly larger than his palm, and its four propeller blades. Knowing the principles of motors, he knew the general structure at a glance.

The fuselage itself is just a battery + motor, but there are no wires connecting it. How did people in later generations control its flight direction?
How is the shooting done? This can also record the scene, which is a powerful tool for spying on the enemy!
Zhu Yuanzhang's eyes widened again. What a good thing! But he just didn't know the principle.

"Perhaps we can replicate this helicopter by using a steam engine as its power?" Zhu Biao said thoughtfully.

"Yes! Why didn't we notice it!" Everyone was annoyed that their attention was attracted by the drone. Generally speaking, the smaller something looks, the more complex its composition is. On the contrary, the principle of bulky machinery is much simpler. This is the rule summarized by everyone.

Flying vehicles must generate heat. Hot air balloons only fly passively and are very inefficient. If the wind direction is wrong, you can only leave it to fate. The free rise and fall and flight of an airplane is what everyone desires.

The airplanes imitated by the imperial court today could not take off because of insufficient propulsion power and the heavy steam engine itself.

Everyone knows that this is because of the internal combustion engine mentioned later, which is much more efficient than the steam engine.

In order to solve this problem, the Ministry of Industry added several horses to pull the plane, but the frame of the plane was almost falling apart and the speed was still not enough. Maybe it could fly with the help of strong winds in the summer, that's what everyone thought at the time.

Unexpectedly, at this time, we could accidentally learn another method of lifting and lowering the airplane from the sky, and this method seemed to be much easier, at least that's what the people in the science department thought.

[Drones are generally smaller and have fewer blades. Fewer blades means more power saving, and the drone's battery life will also be longer.]

[However, when using it, you will find that this kind of drone design not only does not fly fast but also can perform fewer actions]

[Then people tried three-blade propellers, which had similar problems to single-blade propellers, including unstable fuselage.]

[So the final shape of the drone became this 4-propeller design, which is composed of two propellers in a group, rotating in opposite directions]

[With this design, the drone can do more actions. For example, if you want the drone to move forward, you only need to reduce the speed of the front propeller and increase the speed of the rear propeller.]

[For the same left translation, just reduce the speed of the left propeller and increase the speed of the right propeller]

[If you want to rotate, just lower the speed of the diagonal propeller, so that under the reaction force of the motor torque, it will naturally turn around in place]

[In fact, if you observe carefully, you will find that the drone's movement in the air is basically a horizontal movement forward, backward, left and right, without any distinction between the front and rear of the vehicle.]

Tang Dynasty, Chang'an City.

Li Shimin and others were amazed by the operation of the sky show. It seemed as if he took a black box and pressed a bunch of buttons. Then the drone pulled up diagonally, turned a corner and rose up, rotating and flying in the air.

He also knew that the battery + motor can only make the drone take off, and the flight control part is also the core. These two parts make up the complete drone.

But one of them can be seen and touched, while the principle of the other part is unknown.

The clerks had no choice but to copy it down first, as the information might be useful in the future.

Li Jing and other generals wanted to see the military applications of drones, but unfortunately Tianmu only briefly mentioned this, which made him feel helpless.

"Newton's third law is really simple." Everyone originally thought that the third law was used to launch rockets, but they didn't expect that this was also the reason why the single-propeller drone's fuselage was unstable.

"Your Majesty is right. So the same principle applies to rowing on water."

Everyone agreed that the person who proposed this law was extremely smart.

(End of this chapter)