Return to the red age

The reason why Liu Hai said that the rocket engine itself is fine is because there are many missiles on the aircraft carrier, some of which use solid rocket engines and some use liquid rocket engines.

In fact, many people have a misunderstanding that liquid rocket engines are not as good as solid rocket engines.

But in aerospace, liquid rockets have great advantages. First of all, liquid rockets can be ignited twice.

If you want to land on the moon or Mars, you must use a liquid rocket engine.

That is, the rocket that lands on the moon must turn on the rocket engine when it lands on the moon and returns, which is obviously impossible for a solid rocket engine.

So only liquid rocket engines can be used, and the thrust of liquid rocket engines can also be adjusted, that is, the delivery speed of its fuel pump.

And the world record of the world's largest rocket in 2020 also uses liquid rocket engines.

Of course, solid rockets also have their own advantages, that is, fast response speed, so many air defense missiles and other missiles in the future use solid rocket engines.

Because liquid rocket engines are canned fuel when they are used, the response time is relatively slow.

"You can arrange it yourself. You have too many things on your hands now. Although we have a gap in this area, it is not much." Sun Aiguo wanted to let Liu Hai participate in the research when he heard Liu Hai say this, but he thought of the many things Liu Hai had on his hands.

"In fact, the research investment in various aspects is already very large. To be honest, our country can develop to this day and have such good achievements in industry. A large part of it is because the various technologies you have developed have broken through the blockade of the West and are even more advanced than the West." Sun Aiguo said again.

"Our automobile industry, yacht industry, motorcycle industry, toy industry, and even in the cultural field, and even the military industry can stand out in the world and even occupy most of the market. Basically, it is the technology you have developed."

"Don't worry too much. There are always things that can't be done, and there are always things that are not satisfactory." Sun Aiguo was afraid that Liu Hai would think too much and be too busy.

"Thank you for your concern, Director!" Liu Hai naturally understood the meaning of Sun Aiguo's words.

"You just said that submarines use lithium batteries. Isn't it said that lithium batteries are not very safe?" Sun Aiguo asked again.

"Lithium batteries are unsafe, but they work well. This underwater sightseeing boat is going to use two types of batteries, one is lithium batteries and the other is lead-acid batteries."

"The performance of lithium batteries is better and the sailing time is longer." Liu Hai is of course preparing for those customers in South America.

Using lithium batteries in submarines is actually a relatively risky move. In the traditional sense, all submarines use lead-acid batteries, but the biggest shortcoming of lead-acid batteries is low energy density and heavy weight.

Lithium batteries have high energy density, but they generate heat when charging and are dangerous.

Of course, it doesn't matter if it is for those customers in South America to transport flour, it is a risky thing.

However, when Liu Hai traveled through time, Xiao Benzi used lithium batteries, and it is said that all submarines were replaced with lithium batteries.

Xiao Benzi had his helplessness in doing this, mainly because his AIP system was not good.

Speaking of which, Xiao Benzi was also hypocritical. On the one hand, he said that he was not optimistic about lithium battery new energy, and on the other hand, he used this lithium battery on the submarine.

The use of lithium batteries by Xiaobenzi is a helpless choice, because if the submarine wants to have higher performance, without a breakthrough in the AIP system, it can only use a lithium battery pack with a smaller volume and higher energy density as a power reserve.

Because according to calculations, the performance of the same submarine using lithium batteries is much higher than that using lead-acid batteries. Lithium batteries can allow submarines to stay underwater for longer and perform more tasks.

If Xiaobenzi's AIP system can meet the requirements of use, they will probably not use lithium batteries.

AIP refers to the fuel cell power system, which is to put hydrogen fuel and oxides into a special combustion chamber for electrochemical reaction, directly convert them into electrical energy, and the output direct current directly drives the motor, which drives the propeller shaft.

Xiaobenzi also boasted that this submarine using lithium batteries is a sub-nuclear submarine.

In fact, this is self-boasting, because the underwater speed of Xiaobenzi's Dajing-class motor is only 4~5 knots, and the most important thing is that nuclear power can start the cycle, so that there is sufficient oxygen underwater.

Other conventional submarines only use compressed oxygen.

Without considering noise, the maximum speed of a nuclear submarine can reach 30 knots.

Moreover, lithium batteries have another shortcoming, that is, the cost is too high. The cost of the Big Whale of Xiaobenzi reached 450 million US dollars.

Of course, Xiaobenzi has always falsified data, so it is no problem for him to brag about himself.

Of course, this is also closely related to the lack of resources of Xiaobenzi himself. He has to import everything.

In his previous life, Liu Hai always heard people say that my country is short of resources. In fact, my country's natural resources are not much less than others. Take iron ore as an example. my country still ranks fourth in the world, although the grade is slightly lower.

But many iron ores in my country are not single iron ores, which contain other rare metals.

In the field of rare minerals, my country has always been among the best. During World War II, why did Sandezi give us so many weapons? He wanted our tungsten ore, tung oil and pig bristles.

Why the bald eagle also gives us weapons later is also because it needs these things.

Lead and zinc rank second in the world, and copper ranks sixth in the world.

Natural gas seems to be ranked seventh or eighth.

In the semiconductor era, my country's heavy rare earths account for more than 90% of the world's heavy rare earths.

As for why we feel that we are lacking resources, the main reason is that we import too much.

Why do we import so much? It’s because we used a lot as the world’s factory in our previous life.

And if you don’t use the foreign exchange in your hands to buy these resources, what can you buy?

Some people think that our high-priced iron ore imports are a loss-making business.

But the account cannot be calculated like this. First, how much industrial scale will iron ore smelting drive?

Why are the origins of many iron ores not used for smelting and then we directly import crude steel?

That's because no one does it, and the imported ores contain rare elements.

In the smelting process of many rare metals, we have reached the world's leading level precisely because of our scale.

Just like the slag stored in Panzhihua in the past, when Liu Hai traveled through it, all of it had been smelted and the rare metals in it had been extracted.

Many people don’t understand why our country exports so much crude steel. This slag is also a treasure. Maybe one ton or two tons of slag contains rare metals such as gold, silver, copper, aluminum, or other lead and zinc, which are of little value, but hundreds of thousands of tons and thousands of How about tens of thousands of tons or hundreds of millions of tons?

Even the remaining slag can be used as cement and other building materials, so nothing is wasted.

"So can this kind of lithium battery be used in conventional submarines?" Sun Aiguo asked after hearing what Liu Hai said.

"It's a bit dangerous. The diving toy like mine is small in scale and doesn't contain many lithium batteries. If a submarine of several thousand tons uses this kind of lithium battery, the risk will be too high. First of all, with the increase in battery packs, it will take longer to charge. Fever and other symptoms will increase.”

"The other thing is the cost. If lithium batteries are used, the cost may double!" Of course Liu Hai disagrees with using lithium batteries to build submarines.

"My main customer is actually South America. I used to sell them small airplanes, but now I sell them underwater sightseeing boats."

"For profiteering and dangerous industries like theirs, although the cost of lithium batteries is high, their performance is good, so it doesn't matter."

"There is also a lead-acid battery, which is mainly used for real underwater sightseeing." Liu Hai smiled when he said this.

"Our small aircraft industry is indeed a bit weak right now. Mainly customers in South America can already produce some parts themselves. What they mainly import are engines and instruments. They can actually make other wooden parts themselves!"

"The main reason is that the wood there is very cheap, and the people there can actually hand-make various wooden accessories for small aircraft."

"Some even use a few steel pipes to weld a simple shelf to reduce its own weight and increase the amount of goods it can carry!" Sun Aiguo shook his head.

The technical threshold for fixed-wing small aircraft is not very high. Except for the core engine, everything else can be made by hand.

Liu Hai nodded, this is understandable, after all, separately imported engines are more concealed.

"Can the export price of parts and components be increased?" Liu Hai said after hearing this.

"Prices have increased, but domestic jobs have been reduced a lot. In the past, many factories that produced aircraft wood parts faced the risk of reduced orders. Fortunately, now our demand for wood is very high."

"The wooden frame packaging used for these products exported every year is an astronomical number."

"Now the price of timber imports is getting cheaper and cheaper, mainly because the timber from Southeast Asia has impacted the international market. The countries there have just been established, and there are not many ways to make money!"

"Coupled with the rubber industry that dealers are vigorously promoting, that is, the original trees are cut down and all are used to plant rubber."

"But this is good, because it makes the export price of Xiaobenzi's wood much lower."

You probably know what Sun Aiguo is talking about. We did not exploit our country’s virgin forests more than 10 years ago.

The main reason is that imported ones are too cheap, much cheaper than cutting down forests yourself.

Mainly dealers form a complete supply cycle system. While we export industrial products, we import various raw materials.

And many countries in the world only sell resources in exchange for industrial products.

"Dealers now have almost a monopoly on lumber sales around the world. Just because of the wave of low-price lumber sales in Southeast Asia, many lumber companies went bankrupt, and then dealers bought back these lumber companies." Sun Aiguo took a sip of water. said.

Of course Liu Hai knows that by doing this, dealers have the say in wood.

"But we are not afraid. If their prices are too high, we will cut our own."

"Our neighbors to the north also have a lot of wood. Last year they wanted to export wood to us, but we didn't want it!"

Liu Hai knows that although we have a bad relationship with our neighbors to the north, we still have business contacts, but it's just a big or small scale.

"How are you doing with the Internet? Do you want me to talk to people from the railway department and find out what they think?" Sun Aiguo asked again.

"There's no rush for now. I've already asked someone to make a plan. Once it's done, I'll report it to the superior department." Liu Hai nodded.

"Next year, our area will have a subway connection. The subway line directly from the city center to the airport will be fully connected next year. After that, there will be several subway stations near our factory."

"I really didn't expect it. It will be much more convenient for us to enter the city in the future!" Sun Aiguo said another thing.

"Huh? So fast?" Liu Hai knew that the airport he was talking about was Capital International Airport. In fact, this airport was just northeast of the motorcycle factory.

The motorcycle factory extends over a large area from Dongzhimen to the airport.

Most of the employees inside the motorcycle factory don't know how big the factory is because there are many places that are off limits.

The factory has its own traffic police and its own traffic light system.

The number of vehicles that can enter and exit each factory area is different.

Of course, the factory also has its own aircraft for passenger transport, cargo transport, airports and terminals.

"Sorry, there are already several subway lines. Our plan here is relatively late."

"The next step is for higher authorities to vigorously develop public transportation, mainly because there are too many cars on the road now, including bicycles, motorcycles, and all kinds of cars."

"Fortunately, you suggested making the road wider when building it, but according to the current development, in a few years, the city will probably be even more congested."

"So the next step is to encourage public transportation and prepare to open special bus routes."

"It doesn't mean that buying things like cars is strictly prohibited. Anyway, if you drive yourself, you will miss work, so naturally you won't be able to drive."

"Then the next step is to strictly control the commuting time. For those who arrive late for commuting and leave early, they must be included in more assessments, benefits, and promotions, so that they will naturally take public transportation!"

"In addition, starting from this year, all new buildings must have a certain amount of underground parking spaces. You had the foresight to build several museums and huge parking lots in the city."

"If you open these parking lots now, you can collect a lot of money every year."

"The next step is to raise parking lot charges to further reduce the growth in the number of private cars in Kyoto."

"Let's see if we can slowly ease the traffic!"

Liu Hai finally understood why he didn't want to buy a car in Kyoto in his previous life. On the one hand, there were objective reasons, and on the other hand, it also had the role of policy guidance.

"Should we take out the lithium-ion battery electric vehicles?" Liu Hai was a little hesitant, mainly because it would be more dangerous for electric two-wheelers to use lithium batteries.

In addition, the current power supply is very tight, mainly due to the rapid expansion of domestic industry, and many rural areas often experience power outages.

"However, we can make some suggestions on the highway to reserve some places for charging later!" But Liu Hai thought of another point.

"But now that we are relatively strong in engine technology, there is no need to open another track?"

"But it's a good thing to keep these places. In the future, new energy vehicles will be combined with corporate vehicles. This can reduce our dependence on fossil fuels!"

"Should we build a natural gas-specific engine? Our country's natural gas reserves are not small. The key is that it is cheap!" Liu Hai thought a lot.