The heat engine relies on the flow of the gas working fluid to produce the conversion of mechanical energy, and the converted mechanical energy actually comes from the chemical energy of the combustion of the fuel that heats the working fluid. The development of modern industry has made it possible to increase the initial pressure and temperature of the working fluid, while the basic principles of fluid mechanics can explain that only a sufficiently high initial pressure will have a sufficiently large initial velocity.

In order to achieve a large initial pressure, it is clear that the tightness of the combustion chamber of the engine is very demanding. In the case of piston engines, the sealing of the combustion chamber is important, but given the movement of the piston in the cylinder, it is obviously not possible to seal too much. Finding a piston clearance that meets both of these requirements is a very important challenge in the design process. Even in later generations, even the mechanically skilled Germans were not able to fully grasp such an important parameter. Later, there have been many incidents of a famous German brand of cars being repeatedly "burned oil", in fact, the problem of gap control has not been solved.

Therefore, for such an engine designed by Shen Yiyi, there was no hammer correction during installation, which is quite a peculiar experience for Chinese industrialists in this era. For the coordination of the shaft and the bore, according to the general understanding, the gap between the piston and the cylinder is probably large, so there is no need to use a hammer. So not only did Deputy Chief Engineer Zhou think so, but even Mr. An Zhusheng was a little worried, maybe Shen Yiyi's engine really had some sealing problems, and it was not necessarily that it would leak when it was tested.

However, remembering what the old man Xiao Yizhan said on the phone just now, Shen Yiyi is now very eager to advance the original paramotor assembly day a little earlier, thinking that the confrontation exercise of her father's unit will win time to familiarize himself with the equipment, and the old man An Zhusheng hesitated again. He thought, just like the formulas that Shen Yiyi provided before. There is no reason to use the rules and regulations of the past to limit the creativity of young people. Maybe the engine designed by Shen Yiyi this time really has a reason for such a design. It doesn't matter if it's an air leak, just burn more oil. Piston engines usually do not have high speeds, so the difficulty of machining is not as significant as that of rotary engines. Don't you see that China can produce its own gasoline or diesel engines for automobiles and ships, but it has never been able to produce engines for aircraft, and can only rely on imports? This is where the difference in the difficulty of the technique lies.

Figured it out. Mr. An Zhusheng decided that it would be better to try to get out of the car first. Even if the engine leaks during the test run, it will not explode, on the contrary, it also reduces the risk of the engine pulling the cylinder. He just told Deputy Chief Engineer Zhou to arrange the relevant personnel to prepare the instruments that can be used for a while, and at the same time, he might as well prepare a complete test plan, and take this piston engine test as a real scientific research test. Regarding Old Man An's instructions, Deputy Chief Master Zhou, who already thought that he was included in Old Man An's door wall, was naturally resolutely implemented.

So. When Old Man Xiao Yizhan took the car specially sent by Shen Fei to him and came to the 606 Institute, Old Man An Zhusheng had already arranged everything and was waiting for Old Man Xiao's arrival.

When the two old men meet, they naturally can't change their nature of hurting each other's friends, and they still inevitably have to make fun of each other. For other people who don't often see the way the two get along, seeing an old expert who has always been highly respected in his own unit being hit mercilessly by another old expert in the industry, and at the same time fighting back without scruples. Nature is new and interesting. But no one dared to laugh at such an occasion to their faces.

Fortunately, the two old men have their own concerns today, so it didn't take long to start. Old man Xiao Yizhan couldn't help but ask about Shen Yiyi's engine: "I said Lao An, is the engine on Yiyi's girl's drawings completed now?" She is in a hurry, if you have difficulties in processing here, then I will simply take it back and let Luo Yu and his father find someone to process it. ”

An Zhusheng snorted dissatisfiedly: "Is it useful for you to take it back?" You're not the Dawn Factory, you've never produced an engine. Even if you take it back, you won't necessarily be able to produce it. So old Xiao Tou, you don't have to use my words like this. To tell you the truth, if I can't process it here today, then it's no fun for you to take it back to Shen Fei. ”

Xiao Yizhan actually knew that An Zhusheng was telling the truth. If Shen Fei really had the strong strength to process engines, then he would not have taken the drawings handed over by Shen Yiyi to the 606 Institute in the first place. However, he still had to reply: "In terms of the ability to process engines, of course Shen Fei can't match you here." Otherwise, wouldn't you be sorry for the country's great investment in you over the years? But if that girl is in a hurry, I can only be a dead horse as a live horse doctor, if you really can't do it here because the task is too full, then I'll take it back and find another way. You can't let the girl down. ”

Old man Xiao Yizhan said so, but of course Old Man An Zhusheng knew another meaning that he didn't say. The two old men actually have the heart to include Shen Yiyi as a student in their own industry, or even simply join their own disciples, so for Shen Yiyi, who may become their own proud protégé, of course, if they want to be a master, they must work hard to win the recognition of others now, so that they will be embarrassed to open up to Shen Yiyi in the future. Old man An Zhusheng, who saw through Xiao Yizhan's abacus, would make Old Man Xiao Yizhan too proud, and immediately said: "You don't have to think of any other way, I'll tell you the truth, we have already assembled that machine here." Before you came, I had already arranged the following, ready to enter the process of ignition test run. ”

Hearing his old friend say this, Old Man Xiao Yizhan was still a little faintly surprised. He didn't expect it himself, it turned out that Old Man An was still very interested in Shen Yiyi's engine. Although he also knew that in the process of processing, in fact, An Zhusheng did not stare at the workshop every day, because if that was the case, he would not have met Shen Yiyi in the city library, and he also snatched the new magical formula derived by Shen Yiyi from his grandson. But even if he is not in the workshop, the production and manufacturing of Shen Yiyi's engine has been completed in advance in the workshop, which certainly shows that Old Man An still has a high prestige in the 606 Institute, but it also shows that Old Man An has used his influence in the Institute to mobilize resources to give priority to the production of this set of machines. This time. After all, the Spring Festival period that we Chinese care about the most, it is logically the time when production efficiency is the lowest. Of course, from another point of view, it can be considered that the set of drawings designed by Shen Yiyi can also be considered to be very reasonable to be able to complete the production of the machine ahead of schedule, so there has been no rework.

In line with his consistent reluctance to let An Zhusheng insist too proudly. Old man Xiao Yizhan deliberately ignored the first two factors, and said to An Zhusheng: "In this way, Shen Yiyi's set of drawings is still very perfect, and there has been no rework and design modification." "In modern engineering projects, it is a very common situation to modify the design, because often the process problems that will not be considered in the design will be encountered in the process of production and processing. In order to complete the final product function, the designer has to make a lot of changes in the manufacturing stage according to the actual situation. In order to make the product the fastest and best to become a physical object. Therefore, judging from the drawings of Shen Yiyi's independent completion of the whole set of engines, it is quite rare to be able to avoid rework.

Although he has a perennial disagreement with the old man Xiao Yizhan, in the matter of praising Shen Yiyi, the old man An Zhusheng is unwilling to be left behind, so he immediately nodded and affirmed the old man Xiao Yizhan's statement: "Yes, not only is there no place for rework that needs to be changed in the design, but our master told me, even in the most difficult assembly process." We didn't use the files and hammers we had prepared, which surprised our technicians. ”

Listened to the words of the old man An Zhusheng. Xiao Yizhan was a little surprised. He has never left the front line of scientific research for many years, and he can hear the subtext behind this sentence. Although Shen Yiyi's design is very perfect, so there is no rework, but the problem that the hammer and file are not used may mean is quite clear to a person like him, who is engaged in the overall design and research of the aircraft. Of course. The well-informed Old Man Xiao is also the same as Old Man An, and he doesn't think this will be such a big problem. In his heart, he actually regarded this paramotor as an extracurricular homework for Shen Yiyi and his grandson, and made a relatively large toy. What if it fails? And he didn't think it would fail because of engine problems. You must know that what Shen Yiyi wants to make is just a slower flying machine. If the power is reduced due to engine leakage, it is just in response to the original design concept.

So even if the old man heard the subtext of the old man An Zhusheng. Still urging disapprovingly: "Okay, hurry up and take me to your test site." I can't wait to see what this prototype you have built. I'm telling you, old Antou, don't you take a random thing to make up for me. In that case, you can give me the drawings immediately, and I'll take them and get someone to produce a good set of them. I can't afford to lose this person in front of that girl. ”

Knowing that Lu Dao was joking, Old Man An immediately retorted: "Do you think I am you? I'll tell you, this machine is absolutely produced exactly according to the drawings, and you will be able to see it in a moment. ”

While talking and laughing, everyone came to the place where the test workshop was located. And the power source designed by Shen Yiyi for the first time in this life also lay quietly in this place, waiting to send out his own roar to everyone. (To be continued......)

PS: I would like to clarify an important notion as an industrialist, that modern industrial goods are not handicrafts, they are made up of quite a few parts that are put together one by one.

Therefore, don't expect an industrial product to be made in a matter of days, especially if the protagonist still has limited resources.

So while I'm really speeding up now, I'm afraid it will take three or four chapters for the paramotor to come to fruition.

Let's see if you still have any votes in your hand, and vote for them while there are still a few days left in this month, don't waste it.