Gao Junshan sat in front of the "podium" of the shed, imparting knowledge to his students about the hydroelectric generator room he saw, with his limited knowledge.

He introduced the students to the water bell effect of hydrogenerators.

The so-called water hammer is when the power is suddenly cut off or the valve is closed too quickly, due to the inertia of the pressure water flow, the water flow shock wave is generated, just like a hammer strike, so it is called water hammer.

The force generated by the shock wave of the water flow back and forth, sometimes very large, destroys the valves and pumps. When the electric water pump starts with a combined voltage, it can accelerate from a standstill to the rated speed in less than 1 s, and the flow rate in the pipe increases from zero to the rated flow. Due to the momentum and a certain degree of compressibility of the fluid, a sharp change in flow can cause an over- or under-pressure shock in the pipe, as well as a "cavitation" phenomenon.

The impact of pressure will cause the pipe wall to be stressed and produce noise, just like a hammer hitting a pipe, which is called the "water hammer effect".

Then, in order to actually put a hydroelectric generator into operation, this water hammer effect must first be addressed.

The generator must also have a demagnetization device, if the generator is not demagnetized, there is a magnetic field on the rotor all the time, plus the rotor is rotating, then the voltage is always induced in the stator winding.

For example, if the generator has a short circuit, if the main switch of the generator trips, the system will not provide short-circuit current to the fault point, but if the generator does not demagnetize, it will still provide fault current and eventually burn the generator.

After Gao Junshan explained these basic knowledge, he told his students: "With the generator, we can't immediately use the electricity generated by the generator, because there is still a problem of transportation, and if the problem of transportation is not solved, the generator is just a decoration." ”

One student asked, "Wouldn't it be better for us to use the wire to lead him to the factory, and what kind of transportation would we need?" ”

Gao Junshan said: "First of all, how do you solve the security problem?" Secondly, how do you solve the problem of electrical loss? ”

"Electrical loss?" One student asked.

Gao Junshan said: "Electricity is transmitted through wires, there will be electrical loss in the process of transmission, and the amount of electricity will decrease with the distance of transmission, the longer the distance, the greater the reduction, and when we transmit the electricity to the factory, even a lamp can not be lit." ”

Another student was a little discouraged and said, "What's the use of the hydroelectric generator we've spent so much time building?" ”

Gao Junshan cut the railway: "It is very useful. Aren't you discouraged? ”

"No, no."

The students below answered one after another.

Gao Junshan told them that in order to transmit electricity normally, a transformer should be used, and the voltage should be increased to a high voltage of 10,000 or even 100,000 volts, so that the loss of electricity in transmission would be negligible.

Gao Junshan explained to his students for nearly two hours, and his mouth was dry when he was tired.

Paralyzed, if Lao Tzu can decrypt the laptop, do you still need to bother them like this? There is an encyclopedia in the laptop, what knowledge is not in the encyclopedia? What he is explaining to his students now is what he learned when he was in high school before the time-travel.

Gao Junshan knows that in order to popularize electricity in the factory, there must also be wires.

If you want to produce wires, you must have rubber, and when the rubber from Hainan Island can be cut, wires can be produced.

Without rubber, the industrial development of Gaojunshan was greatly hindered.

After teaching the students, he went directly back to the palace, Gao Junshan came to the backyard of the Chuanxin Palace, where a flight capsule was parked, and the flight cabin was tightly covered with cloth, Gao Junshan gave an order, no one was allowed to approach here, so no one in the flight cabin could touch it.

Gao Junshan came to the backyard, he lifted the cloth cover of the flight cabin, opened the cabin door, sat in the flight cabin, took out the laptop from under the seat and turned it on, pressed the power switch, the screen was bright, and the screen was still the familiar word, please enter the password.

He tried to enter his birthday, but it didn't work, and he entered his student number when he was studying at the military academy, but it didn't work, and he entered some strings randomly, all with the same reaction: the password was wrong.

It seems that the laptop computer can't be started at the moment, and I didn't try again, but I started to think about this flight capsule.

There are weapons in the flight cabin, there is an embedded laser cannon in the nose, and this flight cabin can be started with a full tank of aviation gasoline, so why not make good use of such a good fighter? Even if it can't fly, wouldn't it be nice to use it as a ground tank?

The titanium casing of the flight capsule is absolutely capable of ignoring the firing of any bullets of this era.

Who will pilot this flight capsule?

He began to think about it.

He decided to choose one of his seven sons to pilot the flight capsule.

Among his seven sons, one character is "red, orange, yellow, green, blue, blue, and purple", the eldest Gao Hongbing is engaged in newspaper work in Cao Wenzhao's team, the second Gao Orange Army is far away in Ryukyu, the fourth Gao Oasis is in Mongolia, and the fifth Gao Qingsong is in Persia.

Now the only one who is still in the capital is the third Gao Huanghe, the sixth and seventh are still young, one is ten years old, and the other is five years old, so the only way to let the third child learn the piloting skills of this flight cabin.

The third Gao Huanghe, nicknamed Sanbao, is fourteen years old this year, and is a sophomore at Chongwen Institute of Technology.

"Sambo, do you know what this is?" Gao Junshan first gave him a preliminary understanding.

"The child has never seen this thing, I don't know why." Gao Huanghe replied to Gao Junshan while looking at the flight capsule curiously.

"Sambo, this is a fighter."

"Fighters?"

"Yes, it can fly into the sky and fly like a bird."

Gao Huanghe's interest came up at once, and he approached the flight capsule and stretched out his hand to touch the "bird".

Gao Junshan stopped him: "Don't move! This is a treasure, and we should love it as we love our own lives. ”

Gao Huanghe withdrew his hand, turned around, and looked at Gao Junshan with a confused expression.

Gao Junshan opened the hatch, sat in the cockpit, and then said to Gao Huanghe: "Sanbao, you can come up too, and your father tells you how to drive it." ”

"Hey!" Gao Huanghe happily agreed, but he didn't know how to go up.

Gao Junshan stretched out his right hand to pull him, and then pulled Gao Huanghe into the cockpit.

There was very little space in the cockpit, and Gao Junshan sat on a chair and let Gao Huanghe squat aside to watch him operate.

He turned on the lighting in the flight capsule, and the strong light pierced his eyes.

Gao Junshan said: "You close your eyes, and then slowly open them, and soon you will be able to adapt to the light here." ”

"It's so bright!" Gao Huanghe only has envy.

There are nearly thirty switches on the operation panel of the flight cabin, and it is impossible for Gao Junshan to teach Gao Huanghe, but he has the confidence to meet the third child.

In this way, Gao Junshan asked him to return to the palace in time every time Gao Huanghe got out of school in October, and Gao Junshan started from the most basic operation little by little, and taught his third son the skills of piloting the flight cabin.

When Gao Junshan was teaching the third child, he ordered Sun Kewang to send people to strictly guard the gate of the backyard of the Chuanxin Palace, and not let anyone in.

However, one day, the domineering eighth sister ignored the interception of the guards and cried to break into the backyard of the Heart Palace.