Aircraft assembly work is not as simple as other equipment assembly work.

The imitation of F14, Liu Yijiu didn't ask too much.

He pays more attention to China's completely self-designed Double Three Project!

Once, Long Yaohua also asked Liu Yijiu, a fighter with three times the speed of sound and a ceiling of 30,000 meters is actually not too practical, and the technical difficulty is greater, and more importantly, the body of an excellent pilot cannot be maintained in such a flight state for too long.

The speed of Mach 3 exceeds a thousand meters in one second, and it is difficult for the body of an overloaded person in this state to withstand for a long time. Otherwise, a good pilot will be scrapped.

Originally, the military high-level requirements, or the initial goal of the project, was only Double 26, that is, the flight altitude of 26,000 meters, the flight speed of Mach 2.6, itself was the responsibility of Shenfei 601, and finally the 611 Institute was established, and it was transferred to the 611 Institute.

It is precisely because the performance indicators are too high and the practicability is not too great, and the main combat objects are the Soviet "Backfire" and the American B-1B supersonic bomber, which does not have much effect on other fighters and heavy fighters.

Liu Yijiu didn't say anything at the time, but he had a reason why he had to get out of the double and triple performance planes -- flying in an extreme environment requires a particularly high level of requirements for pilots.

In this way, it is necessary to improve the pilot's reflexes and, at the same time, improve the pilot's physical fitness. This requires more in-depth research into the human body, which leads to genetic engineering and some research to develop the potential of the human body.

This aspect of the project in the Ninth Courtyard has always been carried out in secret. Even at the top, there are few big guys who know. Liu Yijiu wants to conduct research in this area openly.

At the same time, such fighters have a very powerful effect on intercepting strategic bombers coming from afar from the United States. Make it a heavy fighter. The bomb carrying capacity is higher, and the combat effectiveness is stronger.

The republic does not need to be equipped too much, dozens or hundreds of them are enough.

Moreover, as long as the Double Three Project is successful, there will be more extension results!

There is no reason why Liu Yijiu does not pay attention to it.

The one in front of me is only assembling the keel of the key load-bearing parts, and the others have not yet begun to be assembled.

The same two turbofan eight engines, avionics system, etc., because the metal parts have not yet been assembled. It has not yet been transported to the assembly hall.

"Is the thrust of the turbofan eight enough?" Liu Yijiu frowned and asked, you know, the index of double three. It's not easy to achieve.

Feng Lun, the chief designer in charge of the Double Three Project, nodded busily and said to Liu Yijiu, "President Qi is responsible for the design of the turbofan eight, because of the use of three-stage fans. Nine-stage rectification. The thrust of a single unit reached 138 kN, and the thrust-to-weight ratio reached 8......"

Engine technology, Liu Yijiu put forward a lot of technical indicators, and many times he also put forward some key things, and even a lot of projects he has pointed out.

It's just that he hasn't been following the test process recently, but he didn't expect the turbofan team of the 611 Institute to achieve such great results in this regard.

Hearing Feng Lun's words, Huang Qiaosong couldn't help laughing, "Old Huang." The technical indicators of this turbofan 8 were proposed by Director Liu, and many key designs have also been modified by Director Liu......"

For Huang Qiaosong's sycophancy. Liu Yijiu just shook his head and didn't explain anything.

Heart disease in the aviation industry of the Republic has always been criticized and has limited the development of the entire aviation industry.

But in the current situation, the technology of such an engine is not too stable. From the turbofan six directly to such a technical level, even if it is barely reached, it can only be used reluctantly, the turbofan ten of that year, engaged in it for decades, I don't know how many planes finally matured.

"This is very demanding for the manufacturing industry, we can't just pursue performance indicators one-sidedly, safety, stability, is what we need. Just because one or two engines have come to fruition doesn't mean we've been successful in doing this well. Liu Yijiu understood what these people thought.

There were no special circumstances in the development of the turbofan 8, which made him a little incredible.

At one time, the development of the turbofan X, there were countless special situations, which allowed the specialists of the republic to find solutions to the problems and constantly improve them.

In the process of scientific and technological research and development, we are not afraid of problems, but we are afraid that there will be no problems.

That's why Liu Yijiu asked this question.

He always felt that the engine was too easy to do, and even with the design of the integral turbine disc, this experience was not enough to support.

Both the USSR and the United States developed from generation to generation. China is different, it has directly developed across several generations, and if there is no problem, it will make people feel a little unsure.

"There weren't any major problems with the experimental process of Turbofan 8, right?" Liu Yijiu asked everyone.

Qi Hai, who was in charge of the design, was not here, and no one else could answer.

"This is our first self-designed advanced fighter in China, the process can be slowed down, and safety must be guaranteed!" Liu Yijiu particularly emphasized the issue of safe production.

At the same time, quality accidents must also be taken seriously.

"Director Liu, there should be no problems with these engines, listening to Mr. Qi, in the design process, not only our turbofan VI was referenced, but also the R-15 engine of the MiG-25 and the TF30-P-412 afterburner turbofan engine of the F14......"

"Don't give me anything that should, perhaps, be uncertain within the question! This is an issue related to the future of our entire project, to the safety of pilots, and even to national defense security! Liu Yijiu was furious when he heard this.

In technology research and development, such uncertain words must not appear.

Feng Lun, who said this, was suddenly a little speechless.

This matter can only be asked by Liu Yijiu to ask Qi Hai, the chief designer of the engine.

"Where is Qi Hai now?" Liu Yijiu asked about Qi Hai's location.

The engine is the first technical problem to be overcome by domestic fighters.

Before that, we still have to listen to Qi Hai's views, otherwise even if the first flight is successful, it will be a big problem if it wants to develop quickly.

Not to mention anything else, the Republic's J-20 and J-31 fighters made rapid progress after their first flight, but in the end, the speed of equipping troops was greatly slowed down because of engine problems. At that time, the domestically produced turbofan 18 and turbofan 20 were full of problems, and they could only be equipped with engines imported from Lao Maozi.

Although Lao Maozi was made to death by the US imperialists, he did not openly supply Chinese engines in this regard, let alone technology or anything.

Between countries, there are only interests, but there is no eternal friendship.

When needed, they naturally become allies.

In the end, Lao Maozi almost completely fell to the West, otherwise the pressure on the republic would not be so great.

The electronic system, the radar system can be a little worse, the engine or something, is the heart of the entire fighter, the soul of the whole fighter!

"At Fenghuangshan Airport, during this time, our turbofan-8 is undergoing an aerial platform test......" Liu Yijiu kept asking all kinds of questions, which made Huang Qiaosong and others a little unable to cope.

When Liu Yijiu heard this, he looked at the imitation F14 that had been assembled in the opposite corner, and his brows furrowed even tighter.

However, he didn't say anything, but waited for the explanation of the group of people in front of him.

"Director Liu, that's the case, due to the tight time, heavy tasks, the test of the turbofan eight was not completed, in order to ensure the smooth work of the first flight, the imitation of the F14, we did not use the turbofan eight, but the engine of the disassembled F14...... "Under the pressure of Liu Yijiu, even Zhu Houdao had to tell the truth.

Whether the turbofan eight can make the first flight of the imitation F14, in the test flight after the first flight, it is necessary to test the maneuverability and other aspects of the performance of the imitation fighter, in order to ensure that the project can be carried out smoothly, Liu Yijiu usually has little time to come here, and no one else in the management committee of the Ninth Academy has never seen it.

After discussion, Huang Qiaosong and others adopted such a method in order to successfully make their first flight.

After explaining, everyone looked at Liu Yijiu cautiously, the imaginary monstrous anger did not come, Liu Yijiu just sighed helplessly, and then said to everyone, "Have a meal in the canteen here at noon, and then we will go to Phoenix Mountain Airport to see the situation......"

Naturally, the group had nothing to say, and it was just noon.

A casual lunch was solved in the cadre canteen of 132, and the group sat in several cars and headed towards Fenghuangshan Airport, the largest military airport at Rongcheng Air Base.

Phoenix Mountain Airport, which is the largest military airport in the entire southwest, was built in 1931, expanded into a military airport in 1937, and then the Republic was established, has been expanding, is an important airport of the Air Force of the Rongcheng Military Region.

In the vicinity of such an airport, there are not many residents, and it is relatively difficult for new fighters to leak secrets when they conduct test flights here.

The same is true of Taipingsi Airport, but there are a large number of residents around Taipingsi Airport, and the future development of Rongcheng, the development of the south and west will expand rapidly, Liu Yijiu even thought about not building there, and finally put the production line and research base of Yunshi in Taipingsi Airport. Because it's a civil aircraft, there's no need to worry about leaks at all.

As for the final development of Rongcheng, can such a huge aircraft factory not allow a city to expand and change direction?

The security of the Phoenix Mountain Military Airport is not much weaker than the current Taiping Temple, because this is the Rongcheng Air Force Base, although it is only equipped with old aircraft such as J-7, H-6, and Qiang-5, but it is also the home of the entire Rongcheng Air Force.

After Qi Hai heard that Liu Yijiu was coming here, he waited at the entrance of the airport early.

He was accompanied by Geng Liguo, commander of the Phoenix Mountain base.

(To be continued.) )