Xie Kai looked at the look of hope on the old guy's face, and his expression was weird.

That's what he actually thinks.

If a 150-ton transport aircraft is called the Y-20, it is a shame for the Y-20.

He is well aware of the technical performance of the Y-20, with a maximum take-off weight of more than 220 tons, a maximum load of more than 66 tons, and a range of more than 9,500 kilometers, although the Internet is only more than 7,800 kilometers......

How can a 150-ton aircraft occupy the model name of the Y-20.

"Then it's called Yun-15. Distinguish between military and civilian, the military is called Yun-15, and the civilian is called Yun-10-200, that level, there is no problem with arranging 200 positions, right?" Xie Kai must not let Zheng Yucheng, this old guy, do this kind of good thing alone.

Ma Fengshan and the others hurriedly nodded, indicating that more seats could be arranged.

Zheng Yucheng looked at Xie Kai with disdain, this kid was too faceless, and he gave him an expectant look.

I have to grab the naming rights myself.

"By the way, Mr. Cheng, I think that the overall aerodynamic layout of our military design, some details may be modified to the most appropriate. Although the Il-76 has a strong transport capacity, it is still less economical than the American C-141. Xie Kai looked at Cheng from time to time and said in a consultative tone.

He didn't want to interfere with the design.

However, the current Yun-10 wide-body model, no, to be precise, should be called the design of the Y-15, and the aerodynamic layout is largely based on the Il-76 that Xie Kai got from the Iraqis.

Cheng looked at Xie Kai from time to time, smiling, and making a gesture of listening.

"In terms of pneumatic layout, based on the current lack of experience and technology, it is more reliable to use a conventional layout. In terms of the overall starting layout, we can use a wing design with a large aspect ratio, and I think it can also be used for designs such as leading edge sweep and wingletless winglets. In addition, don't use the structural design of the Il-76 with wings directly through the roof of the cabin......" Xie Kai said, his face became very serious.

These technical features are all adopted by the Y-20.

The Y-15 is obviously for the Y-20 as a basic reserve, on the one hand, to accumulate design experience, on the other hand, it is used to verify these technical theories, so that domestic designers can take fewer detours.

Cheng looked at Xie Kai with Ma Fengshan and the others from time to time.

Once the design is changed, a lot of the work takes longer.

"I understand that there is concern that these design changes will affect the progress of the project. You don't need to rush to produce results, you start to get anxious when you look at the higher and bigger planes abroad. It is useless to build from a high position, what we need to do now is to lay a solid foundation and wait for the upgrading of domestic technology support!"

"Chief Li Mingshan has already put forward the performance requirements of the army for future large aircraft, and our Y-15 will not be able to meet it, and if it is changed, it will be ...... when the time comes." Cheng was embarrassed from time to time.

If Xie Kai is a professional aviation designer, he will not have an opinion.

Xie Kai proposed this, but it needs a lot of experiments.

"Judging from the current annual military budget, how much can the Air Force buy? Ladies and gentlemen, don't just stare at the present. The Air Force's fighter jets are in greater demand...... "Xie Kai understands the future development of the Air Force, and will definitely not disrupt their development rhythm because of some accidents."

In the short term, it is impossible for the Air Force to purchase large military transport aircraft on a large scale.

Il-76, since the collapse of the Soviet Union in the early nineties, the Air Force has gradually accumulated a family base, after several decades, the overall number does not exceed 40, many of which are used as the carrier aircraft of the Air Police-2000 and the Il-78 air nurse transformed from the Il-76.

"Otherwise, we will simply learn from Boeing and McDonnell Douglas and develop a single wing, so that although it will be affected by the layout of the fuselage in terms of transportation, it can be used for both military and civilian purposes. Whether it is an AWACS aircraft, an air tanker, or a bomber, you can use it......" Cheng asked tentatively from time to time.

If you want to modify, it is better to be thorough.

The use of a mid-wing is a medium level of stability and flexibility, at least in terms of the future prospects of the project, and it is better and more cost-effective.

"Nope. Xie Kai shook his head resolutely, "At present, with our technical reserves, it is difficult to solve some problems. For McDonnell Douglas and Boeing, they proposed such a design, which only needed to change the interrupted design and manufacturing, and segment the front and rear fuselages, and directly put them on the top...... Moreover, even then, the strategic transport aircraft of the US Air Force, did not adopt such a design. ”

Large military transport aircraft cannot take shortcuts.

Looking at the world's large military transport aircraft, none of them use a mid-single wing or a lower single wing, all of them are upper wings.

Cheng looked at Zheng Yucheng pleading from time to time, hoping that he could stop Xie Kai from fooling around.

However, Zheng Yucheng looked at the sky with both eyes, staring at the ceiling.

He doesn't understand technical issues, and he won't give blind command.

And Xie Kai doesn't seem to understand, as if he can't say what he doesn't understand. Of course, this is just Zheng Yucheng's understanding of Xie Kai.

"Regarding the wing arrangement, I think we should adopt the design of the overhead wing box, that is, the entire wing box is all outside the cabin, and not the structure of other large aircraft that inserts the wing into the cabin. In this way, the clear height under the wings will be increased considerably, and the size of the cabin can be widened and heightened, which is conducive to loading a single piece of out-of-gauge cargo at the maximum cabin height......" Xie Kai continued.

The hunchback appearance of the Y-20 is the most unique shape of the world's large aircraft, and it is also the most obvious feature that distinguishes it from other large transport aircraft.

The Y-20 can transport even ultra-high cargo that the C-17 can't transport, and the Y-20 can transport ultra-wide objects that the Il-476, the latest modification of the Il-76, can't transport, such as the 99 main battle tank.

Now the 99 tank is still at the stage of drawing design, and Xie Kai cannot but take these into account.

Of course, the Y-15 came out, and the biggest load was that it was impossible to transport the 99 tank, so what?

The Y-15 is just a foundation, and the Y-20 and Y-30 are all to be made.

"As a result, the entire aerodynamic layout has to be modified. Ma Fengshan looked at Xie Kai and frowned, "The previous design used the upper wing to insert it into the roof of the cabin. If it is not inserted, it is equivalent to the entire aircraft falling under the wing, and the strength needs to be higher. ”

At present, there are only 45,000 tons of large presses in China, and the strength of the parts forged by the pressure that this large press can provide cannot support hundreds of tons of aircraft to fly in the air for a long time.

To do this, you need a more stable design, more advanced materials, and a larger tonnage forging press.

means a higher cost.

"Haven't we already started to build a 65,000-ton press?" Zheng Yucheng said casually, "Comrades, in some areas of design, we need to base ourselves on the existing domestic technology and equipment to achieve what conditions, but in the field of national defense and security, our design must be advanced, and if we can't design it, we will lag behind, right?"

This old guy still understands very well.

Xie Kai looked at the old guy, he usually didn't seem to understand anything, but when it was critical, he always hit the nail on the head.

As a unit of the military-industrial system, the design must be forward-looking.

"Not only that, but I would like to use more advanced systems for the avionics systems we use. The individual gauges that indicate data from different systems would like to be integrated into fewer digital displays......"

Since it is to prepare for the Y-20, then, there is no fear of slower time.

With the requirements put forward by the design, the surrounding supporting units will go to this direction to work hard to study, once successful, the entire technical performance can be improved a lot.

"Isn't it too difficult?" Ma Fengshan's brows were twisted together, but he didn't speak, Cheng couldn't help but say it from time to time, "Not to mention how much time it takes to get these things done in China, just a large number of advanced composite materials, etc., the cost will increase to a very high level." Can the Air Force afford it?"

Cost is now the most unavoidable problem for domestic designers.

The technology is too advanced to support more research, and the large-scale use of various advanced materials will be more expensive.

The Air Force cannot afford and cannot afford to use equipment that costs a little more now.

"It's a bit harder. Ten years, is it enough?" Xie Kai asked, "This is not a joke, everyone should not forget that we are engaged in the purpose of the project itself." On the one hand, it is to solve the problem of whether there is a problem, and on the other hand, it is to stimulate the technological development of related domestic supporting industries through these projects!"

If you don't have a good foundation, you don't even want to challenge more difficult techniques.

Those who are engaged in the military industry are all thinking like this.

"The original design of Yun 10, in order to get results faster, had to make compromises like the existing technology, why didn't the Civil Aviation Administration not? "At the beginning, it was said that Yun Shi could enter mass production as long as 30 million, but now, counting the supporting large presses, the engine factories we have integrated, etc., the investment has exceeded 500 million, and it still has not obtained the airworthiness license of the Civil Aviation Administration to complete the commercialization ......."

When he thought of the real situation when he took over Yun Shi, he was disturbed.

This is one of the reasons why several other old fellows often despise him.

Ma Fengshan and the others were a little embarrassed.

Wasn't it all about not letting the Yun Shi project get off the ground, and there was no way to do it.

"Ladies and gentlemen, Director Zheng said this, and he didn't mean anything else. At the beginning, I didn't have any money, so I had to do it. And now, we don't need to think too much about the cost, what we need is technology, the experience and technology accumulated in the process of breaking through technology!" Xie Kai saw that Zheng Yucheng made the whole atmosphere embarrassing, and hurriedly rescued the scene.

Zheng Yucheng also realized the problem, and hurriedly said, "Yes, the purpose of this is to let everyone not be afraid! Yun Shi is now mature in technology, and the supporting facilities tend to be perfect...... We are engaged in design to make the package adapt to us, not to adapt to the match. ”