At the beginning, Yang Hui made the overall structure according to the idea of restricting the F18EF of the US imperialists, and then found that according to the method of increasing the internal oil of the US imperialists, the internal oil of the new Jj should properly get rid of the F18E/F.

First of all, we have to talk about the U.S. imperialism when designing the F18, it was a serious carrier-based aircraft, and the wings had to be folded, which was conducive to saving space, but it also led to the fact that the outer section of the wing that could be folded up could not be loaded with oil.

F18 is a fighter that focuses on low-speed flight ability, in order to pursue higher lift considerations, the wing profile design of the wing is relatively thick, compared with those who focus on high-altitude and high-speed fighters ultra-thin wing profile, the F18 wing can be loaded with a large amount of fuel.

The analysis shows that the fuel in the wing fuel tanks of the third-generation aircraft can be the same as the amount of fuel in the fuselage, and sometimes even more.

The new J, like the F18EF, enlarges the fuselage and the wing at the same time when designing. The F18 has its limitations as a carrier-based aircraft, which makes it impossible to fully utilize the huge internal space of the aircraft.

But in the new J-J designed by Yang Hui here, everything is a different situation, in line with the requirements of the Republic that there is no development of aircraft carriers called carrier aircraft, the new J-J naturally does not need to fold the wings, and at this time, the internal space of the entire wing can be used to load oil.

Thinking about the current new J, if the design of the U.S. imperialism's F18E/F to increase the mid-fuselage fuel tank is continued, then the extra fuel in the wing fuel tank of the new J-J will be a completely extra good thing.

It seems that when the U.S. imperialists designed the F18, the fuel capacity in the aircraft never met the requirements of the U.S. Imperialist Navy, which has a lot to do with the folding of the wing space.

These situations are naturally a good thing. The more fuel the fighter can carry, the happier Yang Hui will be, if it can reach the height of the Su-27. Then it's all really good!

For such a crazy idea, Northrop here can only shake his head and sigh. This design idea is simply extreme!

He may not know the Su-27's more extreme internal oil design, and if he knew, he probably wouldn't sigh anymore.

"The new cabins are all used to carry fuel, and it seems that your army has high requirements for the range of the new aircraft, but this is also the way it should be. The range of the F18 is quite short, and it is difficult to cure this problem without strong medicine, and I don't know if the engine can propel such a heavy fighter. ”

Northrop talked about the problem of the engine again, and Yang Hui just smiled helplessly, anyway, the engine is insufficient thrust no matter what.

The stereotyped old medium thrust turbofan has a thrust of more than 7 tons in 10, which is about the same as the thrust of the F404. This thrust is definitely not enough, and even the new generation of mid-thrust specially developed for the new J-J may be a little difficult.

According to the plan, the thrust of the new medium thrust developed this time is at most 9 tons, and there is still a gap of one ton between the nearly 10 tons of thrust of the F414 engine used by the Yankee F18E/F.

An engine is one ton apart, and the two engines add up to two tons, and the design of the same size, the thrust of the new J is obviously insufficient, how should Yang Hui consider this design?

"Our engine thrust is really not enough, according to the design requirements. The power of the new J-20 is the best, but now the thrust of 18 tons is not unacceptable. ”

When Meidi designed the F18E/F, it definitely didn't have to worry about the engine, and they used as much power as possible at the beginning of development. Even after 2010, GM proposed that the thrust could be increased again on the basis of the F414: F414EPE, the new engine could increase the thrust by 20 percent to the 12-ton level.

But in the end, the US imperialists chose to give up and continue to upgrade the engine. The reason is that in the positioning of F18E/F, it does not need a high thrust-to-weight ratio of the whole machine.

Say. A total of 20 tons of thrust is enough for the power system, and now 18 tons of thrust is a little less. But it's not that it doesn't work.

The most important point is that the engine can continue to improve and increase the thrust in the future, but if the aircraft does not leave some room for upgrading when designing the fuselage, it will be difficult to make great progress even if the engine thrust goes up in the future.

Northrop's side naturally did not understand such an explanation, after all, the thrust of American aircraft engines has never been something that aircraft designers have to worry about.

Shaking his head helplessly again: "Since you insist on designing it this way, then it is okay to design it like this, anyway, the future mission of this aircraft is more of a ground attack, and the thrust-to-weight ratio of the whole aircraft is bearable." ”

To put it mildly, the problem of the power system was finally said for the time being, but the other problem that followed was even more troublesome.

Now to develop a new J on the basis of F18, although the design of the new J has a lot of differences, but there are also many inheritances, and one of the biggest features of F18 is the use of composite materials that have been ridiculed.

The F18 uses a large number of composite materials in the development, which is called a plastic worm, which shows that this fighter uses a large number of composite materials in the manufacturing.

"F18 uses a lot of resin matrix composites in manufacturing, which is the key to F18 weight reduction. But I don't see that your country has the ability to make carbon fiber composites used in aircraft, and the United States absolutely prohibits the export of composites! ”

F18 uses a large number of composite materials, this is because the United States has the ability to manufacture qualified composite materials, but looking at the entire republic, it is absolutely impossible to get this kind of aviation-grade composite materials.

The artillery unmanned reconnaissance aircraft jointly developed by the Southwest Science and Industry and the Western University of Technology has advertised that 40 percent of the entire aircraft is made of composite materials, and the final finalization will be completed soon.

But what is the composite material of this unmanned reconnaissance aircraft, Yang Hui knows very well, strictly speaking, this composite material is similar to the so-called "composite material" used on the DJI drone in the previous face.

It is already a very big adventure for this kind of thing to be used on an unmanned reconnaissance aircraft with low overload, and if it is said to be used on a fighter jet, then Yang Hui can only ......

"Yes, we can't get qualified composites for the new machine, but we have our own way of reducing weight. The reason why the F18 uses composite materials to reduce weight is that the composite materials are much lighter than the aluminum-magnesium alloys that were widely used in aircraft manufacturing at that time, but the advantages are not obvious compared to the new aluminum-lithium alloys now. ”

Yang Hui still knows a little about the composite materials used in the manufacture of F18, although Northrop did not take the composite materials manufacturing technology used in F18, but there is still an introduction to the performance of the composite materials used in F18, after all, the performance of materials in body manufacturing is also quite critical.

The F18 uses carbon fiber composites to make many parts of the aircraft's wings, including those that can save 1,641 pounds (744 kg) of weight compared to traditional aluminum-magnesium alloys.

The early F18A/B model can achieve such an effect, can you think about how much weight will the F18E/F lose because of this technology? A conservative estimate is about the same as a 1 ton weight loss.

The weight reduction advantage brought by this excellent design is indeed quite important, if the new Jr. can't do this, then it will have to bear the extra 1 ton of weight.

Think that this can weigh up to 1 ton! Originally, the power of the new J was a little difficult, if you add 1 ton of extra weight...... (To be continued.) )