Siheyuan: I eat melons while doing scientific research

Chapter 1139 Why don’t you ask them what they need?
Simply lengthening the fuselage or adding an extra fuel tank would not necessarily affect the overall load-bearing structure of the aircraft, but the Mercury 100 was so ridiculous that its margins were almost completely removed.

Gao Zhendong's opinion also left a way for the Gauls to completely refuse to cooperate on the voyage. Either increase the voyage or increase the margin. In this way, the Gauls would be much more likely to reach a compromise in some aspect.

Of course, Gao Zhendong did not offer any specific suggestions on how to strengthen the system. First, he was not familiar with it, and second, he could not offer any suggestions at this stage. He was focusing on the general direction, and the details could only be decided after the design was actually started, which was too early at this stage.

Chief Engineer You also understood this logic, he just took Gao Zhendong's opinion to heart.

"Chief Engineer Gao, what is your third opinion?"

"The third opinion is that the legs of this plane are too short." Gao Zhendong laughed.

"The legs are too short? Didn't you just talk about this?" Short legs, as the name suggests, means the range is too short and you can't run far. This has already been mentioned just now, and it was explained in great detail.

Gao Zhendong laughed even harder and shook his head: "When I say short legs, I'm not using an adjective, but short legs in the physical sense. The landing gear of this plane is too short!"

——Short legs (physics).

Are you really saying that the three legs of the plane are too short? This plane has a typical tricycle landing gear, and it does have three legs.

"Chief Engineer Gao, a shorter landing gear will be beneficial to the aircraft structure layout and materials, right?" Chief Engineer You was clear about this.

Gao Zhendong shook his head: "That's true, but for an airplane, there are more important things to consider. The landing gear of an airplane may look inconspicuous, but it has a characteristic that once the length, position, and retraction method are fixed, there is almost no possibility of modification in the future, which will affect many things."

After Gao Zhendong's reminder, Chief Engineer You finally remembered, you know what, you really can't say it, this thing does look inconspicuous, but it cannot be changed at all.

"So what problems will this cause?" Ask humbly.

"The biggest problem is that the plane cannot be re-engined. Did you notice that the plane's altitude is just high enough to fit the existing engine?"

This was also a big problem with Mercury 100, but before this problem broke out, Mercury 100 was already dead, and people in later generations didn't even realize it.

As for another model that has been around for a long time, it suffered a great loss and had a lot of trouble because of this problem.

I'm talking about you, 737.

Because the 737's ground clearance could not accommodate the increasingly large diameter high-bypass turbofans, it had to adopt the method of extending the engine mount forward in later modifications. This method greatly changed the aerodynamic configuration of the aircraft, causing it to naturally tend to lift its head.

What to do if you naturally like to look up? The 737 adopts an abstract solution - it detects abnormal head rise and automatically presses the nose down.

Speaking of similar methods, we have actually used them a long time ago on the most primitive "Air Police", but we used a fixed offset on the joystick to solve the yaw moment problem caused by the propeller, and that was a professional aircraft with no one on board except professional staff.

However, using this method that only treats the symptoms but not the root cause on a passenger plane is somewhat too human.

Then, even more unfortunately, the 737 encountered Zang San's flight control outsourced programmer. Zang San, who knows what others know, is indeed good at writing PPTs, but that's all. He is really bad at writing programs and relies entirely on patches to make a living.

This incident is also recorded in the extremely hard Bug10 operating system. The value of "one bug is a bug, but a bunch of bugs can work" is fully demonstrated in Zang San.

Ultimately, the 737 was loaded with outrageous patches and bugs.

However, such things that will happen decades later are almost unimaginable to all the comrades today. What's the problem with that? It's OK as long as you can bear it.

"Comrade Zhendong, what's the problem?"

"This will prevent the aircraft from using more advanced high-bypass turbofan engines in the future, and it almost sentences it to death in terms of its improvement potential," said Gao Zhendong.

“High bypass ratio turbofan?” Chief Engineer You was a little confused. He knew about turbofans, but high bypass ratio turbofans… he was really not familiar with this aspect.

"Let me put it this way. High bypass ratio turbofans will be the only power source for mainstream passenger aircraft in the next few decades, and the bypass ratio is going to increase. With a fixed core engine, the greater the bypass ratio, the greater the thrust and the better the economy, which will make the bypass ratio even higher. The current landing gear height of this aircraft makes it almost impossible to increase the bypass ratio."

These words not only made Chief Engineer You vaguely understand the disadvantages of short physical legs, but also made him remember another sentence firmly - "high bypass ratio turbofans will be the only power source for future mainstream passenger aircraft."

A sentence from the leader of the Defense Work Committee made him understand the weight of Gao Zhendong's words: "Well, you must carefully consider Comrade Zhendong's suggestions on aviation engines. He has done in-depth research in this area." The R11F-300 engine improvement that is currently being worked on is almost the highest-level aviation engine in the country. How this thing was modified and how this thing came about, others don't know, but the Defense Work Committee doesn't know?

Chief Engineer You nodded repeatedly: "Fortunately, it was discovered early. We will put forward these as the most core requirements to the Gauls. Now we are facing a problem. What technology can we bring to the table that will allow us to be more than just a fund provider in this cooperation."

It is difficult to say what the relationship is between funders and technical collaborators in technical cooperation projects, but we are certainly not satisfied with being just a funder, especially when our funds are not very abundant. Appearing as a technical collaborator will give us greater say.

In this regard, although Chief Engineer You is the chief engineer of the Civil Aviation Commission, he is actually penniless and has to seek help from the defense engineering system which has more technical capabilities. The person in front of him is the top technical expert in the defense engineering system.

Moreover, his opinions and suggestions just now further highlighted this point. This comrade's reputation is truly well-deserved. No wonder this comrade was the first person recommended by the Defense Work Committee and the first person I contacted.

At this time, Chief Engineer You also hoped that Gao Zhendong could provide some technical chips.

Gao Zhendong had already considered this almost inevitable problem and was fully confident about it.

“Three directions, we can provide our technology from three directions.”

Three again. Chief Engineer Gao likes the number "three" very much.

However, this number made General Engineer You ecstatic. To be honest, it was a bit too much.

"Computer?" he asked tentatively. There was no other reason. Compared with the silence of materials, computers were much more famous.

Gao Zhendong was stunned and shook his head: "No, the computer is just a device. We can use it as a bargaining chip in this regard, but it is not a bargaining chip for the key technology of the passenger aircraft."

Even computers are not counted? Not to mention Chief Engineer You, even the leaders of the Defense Work Committee were confused. How many things are in this kid's head?
If we had more comrades like him, we wouldn't need the Gauls anymore and we could even do it ourselves.

"Great! Chief Engineer Gao, what's the matter?" Chief Engineer You didn't care how surprised the Defense Work Committee was, his first reaction was that it was safe!

"The first one, of course, is my job - materials..."

Gao Zhendong's words shocked Chief Engineer You. Is your job to produce materials?

Looking at Chief Engineer You who was dumbfounded, the leader of the Defense Work Committee interrupted: "Well... Comrade Zhendong's professional field is quite broad... His major is indeed not materials, but his main job is indeed materials..."

Well, I believe whatever you say. But what do you mean by gnashing your teeth when you say this?

"Then what materials can we provide?" This is what he cares about most, materials. If there are really a few suitable good materials, then we can really stand up straight in front of the Gauls. I heard that the special corrosion-resistant steel we exported to them made them very fond of it.

To his surprise, Gao Zhendong was stumped by his question and couldn't say what materials he could provide for a long time.

Is it going to fail? Just when Chief Engineer You's heart was sinking, Gao Zhendong's next words almost made him crazy.

"How about this? When the time comes, you can ask them what materials they are lacking. I can always provide some of them."

Since the system was upgraded, as long as Gao Zhendong was willing to spend the money, it was not impossible to get some other materials besides the steel commonly used in airplanes. Not to say that he could meet all the requirements, but it was not a big problem to meet some of them. For example, the most common aluminum alloy, although they are all aluminum alloys, Gao Zhendong can definitely make better ones.

Chief Engineer You looked at the leader of the Defense Work Committee in disbelief. Could this comrade be lying? It was impossible to let people choose the ingredients.

Then he saw another thing that he also thought was impossible. The leader of the Defense Work Committee nodded and said, "Well, he can do this."

Well, either I'm crazy or the world is crazy, I believe whatever you say.

After this somewhat inexplicable emotion, a burst of ecstasy followed.

The leaders of the National Defense Work Committee would not mess around. So, can they really provide materials according to demand? Not to mention giving everything they want, that's impossible. But if they can provide one or two things in a targeted manner, it would be enough to stand up straight in front of the Gauls.

With computers and materials, there is room for negotiation regarding our ideas and demands.

Not to mention that from what Comrade Gao Zhendong said just now, there are two more areas of technology that can be provided!
(End of this chapter)