As Yang Hui thought, this flight back to Southwest Science and Industry is really related to the overhaul of the only Jianjiao 7A aircraft in China that has been modified with air refueling capabilities.

Seeing Yang Hui coming, Yan Xiufu immediately complained: "This plane is overloaded, and now it has to be checked in advance, I piloted this plane to complete in-flight refueling three months ago, and the test was over, and I could come back." But then the Air Force sent people to test fly this aircraft, it is said that it is to evaluate the ability to refuel in the air, you should know what kind of virtue those people in the army are, and it only took three months for this aircraft to almost reach the C inspection state. ”

While speaking, he kept despising the air force gang of Qiu Ba in his heart, saying that the evaluation test flight was obviously training the ability to refuel in the air, and the pilots sent by the air force to study and evaluate in the three months back and forth were about to break through a group.

This is obviously to take the opportunity to fly for hours, but fortunately, this time I ran fast, and drove the plane back in the name of C inspection, which is really sinister in the world, and people's hearts are not ancient.

Hearing this reason, Yang Hui really didn't know how to answer, the Air Force is so keen on air refueling, it seems that it should be a good thing, maybe the domestic version of Jianjiao 7A needs to have air refueling training capabilities.

Thinking of these situations, Yang Hui smiled: "Don't be sad, isn't this flying back?" Now put aside the matter of the Jianjiao 7A, our J-74 is about to start a large-scale test flight, and you come back just in time, and now there is a shortage of test pilots. By the way, what is the progress of the development of the four-engine oil 6 on the Xifei side? ”

Yang Hui has always been quite concerned, and through the development progress of this aircraft, we can also get a glimpse of the development ability of Xifei in large aircraft. In this way, the strength of Xifei was once again accurately assessed, and the engine development progress of the base for the new passenger aircraft was arranged.

The news obtained from Yan Xiufu also made Yang Hui quite satisfied. Xifei has now built a third prototype and put two into test flights at the same time. This is quite powerful in the development of large aircraft.

"However, most of the designers of Xifei have been transferred to the development of passenger aircraft, I took a look, those personnel are young people, almost the backbone of the future of Xifei, and I don't know if there is any impact on the development of tankers. There is another thing, in the passenger aircraft development project of Xifei this time, there is a young man named Tang Changhong who has been appointed as the deputy chief engineer, and it seems that he is quite valued by the chief engineer Ma. ”

heard the news of his other roommate Tang Changhong. Yang Hui smiled, this guy is very good, he wants to make a leap on the road of technology, take a big leap forward, and sit directly at the level of deputy chief engineer, which is more difficult than Yang Hui's promotion in the administrative route of southwest science and industry.

Maybe this guy has also made some great technology in Xifei, otherwise it would be impossible to make a big splash on the road of technology so quickly. I just don't know what technology has been made, it is so important that I can directly support Tang Changhong to sit in the position of deputy chief engineer?

If you don't understand it, you just don't think about it. It is only necessary to know that Tang Changhong should have developed a very good technology, which is good news, and there is no need to ask too much about specific aspects.

I figured out what happened to the fighter plane that returned from the night flight, and I also unexpectedly learned about Tang Changhong's news. Yang Hui went back satisfied, there was a new situation on a new day

The new day was already mid-May, and the planned turbofan-10 engine was loaded with the J-74 aircraft. It's time for a test flight.

After three years of huge investment, plus the technology is not too risky. This turbofan 13 engine with improved self-turbojet 10 has been finalized and is basically technically reliable.

On this day, the viewing platform on the side of the runway was packed with people. Everyone rushed to see this almost "new" multi-role fighter.

The first flight of the J-74 has attracted great attention from the Navy, and after this new fighter is equipped, the Navy can be at the same level in terms of equipment as the armaments of major countries in East Asia and Southeast Asia.

With the ability to refuel in the air, the navy's combat range will be greatly expanded, and all the sea and air in the South China Sea can be flown for cruises.

A multi-purpose aircraft tailored for the Navy, naturally there is no air force, 0611 is responsible for the research and development of the J-75 has been a test flight one step earlier, the Air Force is now in Jinguancheng looking at the J-75.

The aircraft in the runway is derived from the Jianjiao-7A, but now it is very different from the Jianjiao-7A, the cockpit of the Jianjiao-7A is improved from the single-seat cockpit of the Jianjiao-7, but the cockpit altitude has been raised a lot.

Now the Jianjiao 7A tandem two-seat cockpit has been changed to a single-seat cockpit, and the J-74 inherits the cockpit design advantages of the Jianjiao 7A, although it is a single-seat design, but compared with the old-fashioned J-7, the cockpit has to be raised a lot, and the field of vision has made a qualitative leap.

The design of the landing gear is even more pleasing to the eye, the fuselage of the single-engine aircraft is relatively narrow, and it is not suitable to design the main landing gear close to the fuselage, which is prone to rollover.

However, after the landing gear used on the F16 became popular, it was discovered that the original landing gear could also be designed like this, and Southwest Science and Technology also learned this trick.

After the redesign, the landing gear was tucked into the belly, and the fuselage had to be improved, with a smooth and smooth transition from the outer surface of the air intake, which squeezed out the place where the landing gear was placed, but there was still a small protrusion where the wheels were placed, but it did not affect the whole.

Judging from the design of the fuselage alone, the fuselage interruption is completely the appearance of the later Thunder Dragon 01, and the front section and cockpit part are because of the army's requirements for flight range, continuing the hunchback of the Jianjiao 7A, but it is quite the style of the later Jian-10.

Because the middle fuselage is to be equipped with landing gear, it is enlarged a little, in order to be more in line with the area ratio design, the diameter of the rear fuselage has to be enlarged, which is just suitable for the size of the turbofan 10.

Just looking at it from the outside, I think it's just the rear fuselage enlarged, that's a big mistake, the design of the rear fuselage was designed from the ground up by those technicians who were seconded from 0132 when the Jianjiao 7A was developed.

There are too many complaints about the design of the rear compartment of the old J-7 and even the J-7A, and there is a big weirdness in the design of the J-7, that is, this aircraft is quite strange when changing the engine.

Want to maintain your engine? Sorry, you need to dismantle the entire rear fuselage, all the way to the root of the main wing, and then you can see the real body of one of the engines.

This is quite a disadvantage, when most aircraft are directly designed with engine quick release, this design of the old J-7 is simply anti-human, and it takes a lot of man-hours to dismantle the entire rear fuselage.

The performance of the Soviet engine was not very good, and the maintenance was more frequent, and you also designed such a rear fuselage section, which was definitely quite damaging to the combat effectiveness of the military team.

Also: what about maintenance support in wartime? What about the aircraft attendance? Even to put it mildly, what if the cost of the whole life cycle of the aircraft remains high due to the more man-hours consumed in maintenance? It's definitely a poison point.

Fortunately, this problem has now been solved, and these technicians seconded from the 2nd Institute and the 0132 factory worked together to create a new rear fuselage design.

The engine compartment with three-piece structure design, when the engine is picked up and placed, you only need to open the hatch to directly see the connection between the engine and the fuselage, and the speed of disassembling and assembling the engine is at least ten times faster than the original old J-7.

Of course, the detachable refueling cone in front of the nose side is the first case of a republic and military aircraft, and this is the secret of the Jianjiao-7A fighter flying with such a small body to fly a large range. (To be continued......)

PS: I've been in poor shape lately and I'm adjusting, so forgive me.