Chapter 157: Wild talk ten

Hearing Guo Rongwei’s inquiry, Tan Zhenhua cleared his throat and began to express his views:
"Then I'm just talking nonsense. It's a wild talk, but it's not true. I heard that the "Yun X" was originally developed for a very clear purpose. It was to be used as a special plane for the chief, so a lot of practical voyages have been proposed. At 7,000 kilometers, the cruising speed is greater than 900 kilometers per hour, the ceiling is 12,000 meters, and the take-off roll distance is not more than 1,300 meters."
"In order to achieve this target, we also surveyed and mapped a Boeing 707 given to us by the Pakistan Railway in a certain way, and redesigned it as a blueprint, breaking through some new materials and new processes, and even carried out this The development of a certain type of turbofan engine with a large bypass ratio."
Guo Rongwei nodded.
Since "Yun Ten" itself is a civilian project, there is no particularly high level of confidentiality, these contents are basically semi-public, Tan Zhenhua knows this is not unusual.
Tan Zhenhua went on to say: "However, according to my understanding, we have not done enough to make a large passenger plane."
"Like this machine, the current "Yun Ten" can basically be considered semi-manually made. Of course it is understandable to use it as a prototype, but if it is to be mass-produced in the future, it will definitely not work. The quality of the components cannot be effectively controlled and guaranteed, and the interchangeability cannot be considered. The pressure on the ground maintenance of such an aircraft is simply inestimable. This is obviously the civil aviation department that needs to undertake maintenance tasks in the future. Unacceptable. I heard that the civil aviation department refused to accept the "Yun X", and this aspect also accounts for an important factor."
Seeing several people listening attentively, Tan Zhenhua continued:
"Let's talk about materials and workmanship."
"Our China's industrial system is basically inherited from Soviet Russia, focusing on practicality and despising the foundation. The consequence of this is that it is often when it is needed to find that it is lacking in this area, and then we will quickly study it. This is a very Big problem.
For example, I heard that new-style civil aircrafts in the West have begun to experiment with carbon fiber composite materials to make part of the fuselage, but our country is basically blank in the carbon fiber field. This time I want to build a carbon fiber propeller for my 4-rotor. Schemingly said that the Tong Mi countrymen relaxed restrictions, as evidenced by the obliquely obtaining a batch from the Japanese country.
And the thing about civil aviation is that it needs to save fuel. Effectively using new materials to reduce weight is a good way to increase the economy of the aircraft. After all, weight reduction is equivalent to saving fuel. In this regard, we have to make up too many lessons.
As for the craftsmanship, let alone. The structural strength of such a large aircraft is the top priority, after all, it is about hundreds of lives. But we don’t have a giant hydraulic press, and we don’t have high-strength welding technology. Relying on local methods, combined assembly, small parts welding, and riveting can be considered a flowery at best.
Big airplanes require the support of the entire industrial system, as well as a very strict quality control system and precision manufacturing process. These are even more distant from leading Western countries. Just look at how painful it was to implement the quality management and product acceptance system introduced during the same period when we introduced the "Speey" engine. If these most basic things do not break through, "Yun 10" is just a flower in the mirror. , It looks beautiful.
Finally, let's talk about the engine.
To be honest, I personally doubt whether a certain type of engine can be practically used. Turbofan engines are not a simple thing. I heard that during the flight test last year, the "Yun X" actually used the Pratt & Whitney JT for Boeing 707. -3D engine, borrowed from civil aviation.
Of course, using a mature and reliable engine during the test flight is a good way to reduce the risk, but since we have already bought the Spey military version, why can’t we also buy the civilian version? Wouldn't it be more realistic to imitate while improving? We must know that our country’s civil aviation now uses this engine for the
Trident
that flies the most in the sky, showing its maturity. "
After listening to Tan Zhenhua's long talk, Guo Rongwei remained silent for a long time.
Although he himself did not participate in the "Yun Ten" project, many of his former classmates, alumni and even students have participated directly or indirectly. What Tan Zhenhua said is indeed the truth. After 10 years of smashing and mixing, the "Yun Ten", which finally went to the sky, is indeed a problem. The entire industrial base of China is too weak. It is really difficult to support projects like "Yun Ten", let alone the big guy "Yun Ten" , Even if a small person like the "Yun 7" is still a transport aircraft with much lower requirements than a civil airliner, it is now full of difficulties.
However, from a technical point of view alone, Tan Zhenhua said there are still some problems.
He opened the mouth and said: "We do have a military Spey, and we can also copy and produce it according to the license, but one is that we didn't buy the civilian version of Spey. Second, even if we buy it, the thrust is too small to carry." Transport ten "such a big plane."
Tan Zhenhua explained with a smile: "Ms. Guo is right. "Yun Shi" is a big guy with more than 100 tons. Even according to the current four-engine plan, at least a single engine has a thrust of more than 8,000 kg.
But I didn't say that I would continue to "run ten". As I said just now, my opinion is that the machine will stop and people will not stop. Let me say that this "Yun 10" is too advanced, so we can put it aside first. We can build a smaller passenger plane with the existing industrial capabilities.
According to me, the parameters of this aircraft can be set like this:
The passenger is controlled within 100 people, the captain is about 30 meters in length, the economic cruising speed is about 800 km/h, the empty weight is about 20 tons, the maximum take-off weight is about 40 tons, and the commercial load is 8-9 tons, which means 80-90 passengers. In this case, the flight distance can be 3000 kilometers.
This kind of aircraft can basically be handled with two civil models with a thrust of about 5,000 kg. It should be enough to meet the needs of China's domestic civil aviation at this stage.
Moreover, the size of this aircraft is very suitable for the actual needs of many third world countries. After all, there are only a few countries in the world with such a large land area. Most poor countries have requirements for the range and passenger capacity of domestic passenger aircraft. It's not that high. They may pay more attention to the price factor, so there will be many potential customers.
The most important thing is that the size of this aircraft is about the same size as our "H-6". Compared with the current "Yun-10", the technical requirements can reduce the difficulty very much. It is matched with our existing industry. Ability, it is entirely possible to come out. After we have accumulated experience, users and industrial capabilities, then develop larger models, isn't it more realistic? Those people who are engaged in the "Yun Ten" and the many new materials and techniques accumulated by the "Yun Ten" will not be abandoned, right? "
Guo Rongwei calculated silently in his heart, and found that this parameter was basically reliable. Then he thought about it carefully. Hey, where did you see a similar airplane? He raised his head hesitantly and asked: "Zhenhua, why did you say this? Aircraft parameters, sound like British "BAC"?"
Oops, the plagiarism was found out, and Tan Zhenhua touched the back of his head awkwardly, but his face was notoriously thick, and his face was not red and heartbeat: "Mr. Guo, don't you say it, I'm really in I saw the introduction of this British aircraft in "Knowledge". At that time, I felt that it was particularly suitable for the current situation of our country. So I paid more attention to it. Selling a large axe in front of Luban gate will make you laugh."
Guo Rongwei smiled and said, "You are a layman. It’s a super level to be able to say such things. Although this British aircraft is a bit smaller, it is indeed a good aircraft. In fact, I think what you said makes sense. To eat one bite at a time, everything needs to be done one by one. As far as China is present, this airplane is a good choice."
Wang Jishan on the side listened for a long time and sighed: "It's a pity that such a good project is, but if we can really follow Zhenhua's words, it would be a good way. Unfortunately, we don't count, we don't want to be blind to others. Worry about it, it’s important to do your own business well, come, come, we have done this cup, fill up our stomachs quickly, and go on our own!"
The crowd raised their glasses again, but Tan Zhenhua discovered that Guo Rongwei's expression was serious, as if thoughtful.