Chi Tianshi is a rocket expert who has been specializing in rocket motive for 3o years.

In December 2o15, the Long March 5 carrier rocket was successfully launched, and the motive for the use was that he led the research team to successfully develop it.

The hydrogen-oxygen engine used by the Long March 5 rocket, using hydrogen and oxygen as fuel, is clean, efficient, non-toxic, non-polluting, low cost, and has a high carrying capacity, with a carrying capacity of 25 tons in low earth orbit and 14 tons in geosynchronous orbit, which is basically the same level as several large foreign launch vehicles.

For example, Europe's Ariane-5, the United States' Detar-4 and Cosmos-5 large launch vehicles, the technical performance and payload of the Long March 5 are not lower than them. Because it is a new rocket, the maturity may be worse than them, but there is a rear advantage in technology.

The high-thrust hydrogen-oxygen motor used by the Long March 5 took Chi Tianshi 11 years to develop it. For this motivation, his temples turned from black to white, and he finally successfully completed the 5oo-second long-term test drive in 2o12, and three years later it was loaded on the Long March 5 rocket and successfully ascended to the sky.

It stands to reason that he should be very happy to have accomplished something of national significance, but in fact he is not very satisfied.

The technical indicators of the YF-77 hydrogen-oxygen motor have actually only reached 93% of the initial design, and the maximum carrying capacity is two tons less than the setting, that is, 23 tons in low earth orbit and 12 tons in far earth orbit. The stability is not particularly good, it can only work for about 38o seconds, and once this time is over, there will be problems such as spout rupture and thrust drop, and the quality is low.

When the hydrogen and oxygen engine is used, the temperature of its tail flame can reach more than 3ooo degrees, which is almost the general of the surface of the sun, and there are few substances that can be stable at this temperature. It's already remarkable that Chi Tianshi can do this.

In addition, many technical parameters are set according to the best situation, not as many tons as you can carry. Rather, it is necessary to reserve a certain degree of redundancy according to the actual situation, and the actual performance is higher than the set is good, but it is lower than the setting, and it is understandable that it can reach the level of use.

Chi Tianshi didn't think so.

He felt that he could do better, and there was no problem with the construction of his motivation. The control system is also very advanced, but the material strength is not enough, and the service life does not meet the predetermined requirements, which in turn affects the carrying efficiency of the entire rocket.

The most important indicator to measure the performance of a rocket motor is not its thrust, but its working time.

The structure of the rocket engine is actually very simple: using the principle of impulse, high-pressure fuel is discharged into the combustion chamber and burned violently. The high-velocity guò funnel-shaped nozzle is sprayed, and the resulting back-impulse pushes a huge rocket into the air, with a thrust ratio greater than 1oo, but can only be used once.

Because the state plans to launch Tiangong-3 mission. Advance to 2o18 years. He also learned that the country is recruiting new astronauts to simulate a manned mission to the moon. The manned lunar landing program, which was originally scheduled to be realized in 2o25. It may have been brought forward to 2o2o years, which took him by surprise.

A manned landing on the moon requires the country's continuous high investment! The "Apollo Program" lasted 11 years and cost 25.5 billion yuan (about 6ooo billion yuan now). If we want to achieve such an achievement, it is impossible not to invest more than 200 billion yuan.

In 2o16, country H's investment in the aerospace field was only more than 3oo billion, less than one-fifth of that of the United States, but the benefits produced reached half of them.

But Chi Tianshi's biggest concern is not the problem of money, but the problem of motivation.

The YF-77 hydrogen-oxygen motor he developed was sufficient, but its performance was not mature enough. Tiangong-3 will be successfully launched in 2o18, 13 compartments, and at least 5 in 2o17.

In addition, if the moon landing is to be achieved in 2o2o, it is necessary to develop a high-thrust rocket with a carrying capacity of more than 1oo tons in low-earth orbit, fill the Tiangong-3 space station with fuel, and then fly to the moon...... And to develop such a high-thrust rocket in three years is simply delusional.

He told the above that the performance of the motive is difficult to reach the level of a manned lunar landing in a short period of time, and even if the capital investment is increased, the lunar landing program will still be delayed for several years, and the motive will be said when it is mature.

There was no refutation above, just showed him a turbofan motif used by a fighter.

This motivation is exactly what Tianming calls the mini motivation of the "sugar gourd".

Chi Tianshi was taken aback, and was immediately shocked by this motive, and said in disbelief: "This motive was created by that company?" How is it possible that the thrust is so strong, the thrust-to-weight ratio is 13, and the service life has reached 20,000 hours? ”

The next day, while still working at the Wenchang Shooting Range in Qiongya, he took a hydrogen-oxygen engine, boarded a Y-2O strategic transport plane, and came to a mysterious base.

……

Six Shields of National Defense, Institute of Motivation.

When Tianming came to work at the Institute of Motivation, he saw a new expert coming to Wu Lao and Zhang Lao, and Wu Lao introduced him, his name was Chi Tianshi, a rocket motivation expert.

"It's good to be late." Tianming greeted him.

"Hello, hello."

After asking about today's task, Tianming said to Wu Lao: "Wu Lao, is it another 1oo string of sugar gourds?" There's a lot of goods.,Didn't you make a total of 3oo skewers last time? Coupled with the 7oo motive that helped you improve, all of our country's fighter jets should be replaced with new motives, right? ”

Practice makes perfect, now it takes less than an hour to modify a motor in Tianming, and if it is operated in multiple threads, it can improve 8o units a day, plus the production capacity of the perverted "sugar gourd", in just a few months, the Air Force of country H has undergone earth-shaking changes.

Countless pilots stared at the chrysanthemums of the fighters every day, and they were elated when they changed to new chrysanthemums. If you haven't changed it, you will enviably stare at the plane chrysanthemum that has changed its motivation, and the training is completely out of state. There is no way, watching the flying fast and flexible fighters flying high next to them, the training results are far inferior to those pilots, not to mention, and the air combat is often kept clean by the opponent, it is strange that they can cheer up.

Wu Lao smiled and said to Tianming: "Our J-7 aircraft is about to be retired, but there are still 2,3oo relatively new, you can use it for a while, if you replace it with a 'sugar gourd', the combat performance can be improved a lot, Xiaoxu, you have more time, help make the motives." ”

Tianming does have a lot of free time, and after the launch of the Mother of Industry program, the original goal was to produce results in two or three years, but this goal has now been reduced to one year! Every time Tianming goes over to help, as long as he produces 1oo high-precision parts according to the requirements, he can delay all morning. In the afternoon, he went back to his room and went to sleep.

The reason for this phenomenon is mainly the expert engineers involved in the "Mother of Industry" program, which are still being screened. The personnel have not yet arrived, and there are only more than 2oo experts in the base to temporarily implement this plan, and they also have to learn a lot of knowledge about machine tool design, and it is the limit to be able to digest 1oo parts a day.

In order not to waste Tianming's labor, many miscellaneous tasks were also given to him.

For example, helping the satellite company of the Aerospace Science and Industry Group to manufacture a few pieces of high-precision glass, the resolution of the satellite can be increased to the range of o.1 meters. He also helped the Institute of Biology to manufacture hundreds of glass straws for microsyringes, which can operate inside the cell, and it costs tens of thousands of meters to buy one from the outside, and it took 1o minutes to produce a bunch of ......

Something like this that can be easily produced with an ability brings great convenience without taking up a lot of the person's time, and if you're busy, you can have several orders a day.

Tianming, who felt a little annoyed, asked them to concentrate the task, and he took a day out every week to deal with it at once.

The motivation for manufacturing is a big job, and there is a lot of money to be made, and Tianming is still happy to accept it.

"Yes, the ingredients are double, right? If you don't give a double portion, I can only give you 5o strings of sugar gourds. ”

"It's a double, it's a double." Wu Lao nodded hurriedly.

The next scene shocked Chi Tianshi very much, is this high-tech or magic show? After watching it for more than 3 hours, he thought that when the movie was finished, a hundred mini motives that had just come out of the pot were put out. He walked to a motive and touched it with his hand, and it turned out to be real!

"A miracle, a miracle!" He yelled.

Wu Lao and Zhang Lao explained to him for a while, and the feelings were stabilized. He took Tianming's hand and immediately led him to a piece of equipment and asked his assistant to lift the canvas.

A rocket engine was exposed in front of Tianming.

"Little comrade, help me transform this rocket motive." Chi Tianshi took Tianming's hand and said excitedly.

Tianming didn't answer him, but said to Secretary He next to him: "Old He, how to calculate the motivation of transforming a rocket?" ”

He Xi stretched out two fingers: "2oo million" Seeing Tianming's brows furrowed, he immediately changed his words: "3oo million, 3oo million!" ”

"3oo million is 3oo thousand, this transformation is not a lot of work, right? How many units do you want to modify at a time? ”

"It's not big, it's not big, just modify one at a time." Chi Tianshi hurriedly explained.

"Let's get started."

Chi Tianshi did not lie to Tianming, the structure of the rocket motor is much simpler than the turbofan motor, but the requirements for materials are a little higher, and this aspect happens to be Tianming's strength. The combustion chamber and nozzles have been strengthened to make the molecular arrangement of the superalloy more compact and orderly, and some weld trachoma has been eliminated...... The entire improvement process lasted about two hours.

After the transformation was completed, staring at the rocket motive, a flash of inspiration, Tianming suddenly thought of something, isn't this a chicken leg?

"Lao He, this 'big chicken leg' has been made, don't forget to pay for it!"

"Big chicken legs? Cough! Cough! ”

The people next to him coughed violently, and Lan Luo couldn't stand up with a straight laugh.

…… (To be continued......)

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