Because on the first few fighter jets, only one bidder entered the verification test flight stage, and the Air Force will give the new fighter a formal number at this time, so the j-j-33 project entered the verification test flight stage, and the Air Force still gave the official number, but added the manufacturer suffix to distinguish it.

What are flying are yj-31s and yj-33s.

The "y" here means "verification", which means it is a verified fighter, not a mass-produced type. Before mass production, many designs need to be modified, and even major modifications must be made. Many parts of the fighter, including the appearance, will change, so it must be distinguished.

On June 30th, it is yj-31s.

This is also understandable that the Air Force is the dominant party of j-j-33, so the air force type is the foundation, and the navy type is improved on the basis of the air force type. In order to reduce the difficulty of development, the aircraft manufacturer will definitely ensure the air force type first, rather than the navy type first.

Of course, this cannot be generalized.

The first flight of the yj-31s was very successful. It was piloted by Shenyang Aircraft's number one test pilot. After taking off for fifteen minutes, the landing gear was not put away to make a forced landing at any time. Fortunately, no unexpected situation occurred. After the aircraft's power system was initially tested, the first flight ended.

According to Chen Fei's arrangement, yj-33s will make its first flight on July 1st.

In other words, Chen Fei completed the trial production of yj-31s and yj-33s at the same time, and produced two aircraft for verification at the same time.

Obviously, this has a lot to do with Mu Haoyang.

Everyone knows that Mu Haoyang is a naval general and is responsible for equipment development. Whether yj-31s and yj-33s can meet the military contract must be decided by Mu Haoyang. In this way, Chen Fei's person in charge will naturally not neglect the navy, so he has advanced the naval development work several months.

Compared with the Air Force model, the main improvement of the yj-33s verification aircraft is the strengthening of the landing gear.

Because the fuselage structure strength has reached 12 g, which has exceeded the naval landing standard, there is no need to specifically strengthen the fuselage structure.

Unlike Cheng Fei, Chen Fei did not use tricks on yj-33s.

When the yj-25 was in its first flight, Cheng Fei deliberately used the yj-22 landing gear to reduce the difficulty of test flight. He only replaced the navy's landing gear when conducting landing tests. For this matter, Mu Haoyang also issued a ticket of 1.5 million to Cheng Fei.

This time, the military clearly stipulates that no changes must be made after the first flight of the verification aircraft and all tests must be completed in one breath.

The first flight of yj-33s was also very smooth, but it landed less than ten minutes after taking off. According to the first flight test data submitted by Shen Fei, a group of hydraulic systems should have failed. For safety reasons, the ground command center ended the first flight ahead in advance. It was found out later that a crack appeared on the optical fiber connecting the hydraulic system on the left front edge flap, causing a 90% reduction in signal strength. The computer believed that the hydraulic system had a fault and issued a fault warning. After replacing the optical fiber, j-33s conducted a second test flight three days later.

It can be said that both yj-31s and yj-33s successfully completed their first flight.

Mu Haoyang was also quite satisfied with this.

Compared with j-j-32, the biggest feature of yj-31s and yj-33s is that it adopts a wing body fused with exhaust-free aerodynamic layout, the fuselage and wing are completely integrated together. The main structure of the wing is made of elastic composite material, and the skin is made of memory material. It can automatically adjust the appearance and angle of attack according to the flight conditions. If necessary, the pilot can lock the wing in the basic state, thereby maximizing the aerodynamic efficiency and enhancing maneuverability.

It can be said that the advantages of this design are very obvious.

Without a vector nozzle, the maximum maneuverable overload of yj-31s and yj-33s can reach 12 g. If a vector nozzle is used, it can be increased to fifteen g, and it may even reach twenty g. When j-j-32 uses a double-acting vector nozzle, the maximum maneuverable overload is only twenty g. The first four batches of j-j-32 are only equipped with single-acting vector nozzles, and the maximum maneuverable overload is only fifteen g.

Of course, this design also has its own outstanding disadvantages.

The biggest disadvantage is that it is expensive, elastic composite materials and memory materials are very expensive, and the yield rate of the overall molding technology is not very high. Even if large-scale mass production can reduce the price, it is much higher than the cost of using ordinary pneumatic shape design.

In response to this problem, Shenfei also proposed an improvement plan, namely, adopting a normal pneumatic shape and improving maneuverability by installing vector nozzles. According to Shenfei's test flight arrangement, the third yj-31s and the second yj-33s will adopt a normal pneumatic shape.

At that time, Shen Fei did this and wanted the military to believe that Shen Fei had the ability to develop high-end fighter jets.

In addition, this is also related to Shen Fei's ambition, that is, after the high maneuverability of yj-31s and yj-33s is recognized, it is likely to replace some j-30s and j-32s, become general-purpose fighters of the Air Force and the Navy, and occupy two-thirds of the military's fifth-generation fighter jets.

If this is true, the high-performance versions of j-31 and j-33 are expected to obtain military contracts.

Of course, there is a prerequisite for this, that is, j-31 and j-33 can complete the final design before the Air Force and Navy expand the scale of air combat aircraft, otherwise everything will be empty talk.

After Shen Fei exerted his strength, Cheng Fei was not willing to be outdone.

At the end of August, yj-31c and yj-33c completed their first flight in Chengdu.

Because the initial design comes from j-j-32, in terms of aerodynamic appearance, yj-31c and yj-33c have not been much innovation, and it seems to be almost no different from j-j-32. This is also the key to Cheng Fei's insistence on playing the "price card", that is, a multi-purpose fighter is first of all an affordable and affordable fighter, and secondly a high-performance fighter, rather than blindly pursuing high performance.

In fact, this also makes Mu Haoyang's appetite more.

Although the Air Force and Navy expressed greater interest in the Shenyang Aircraft Plan, Mu Haoyang knew that the YJ-31s and the YJ-33s were likely to become expensive fighter jets, and the Air Force and Navy did not have enough funds to purchase in large quantities.

If a fighter jet is in service for twenty-five years, the cost advantage of the Chengfei plan will be even more obvious.

According to the quote given by Cheng Fei, the procurement cost of yj-31c and yj-33c is only two-thirds of Chen Fei's, and the long-term equipment cost is only one-half of Chen Fei's. It can also use j-30 and j-32 guarantee and maintenance equipment. Overall, the overall equipment cost is only half of Chen Fei's.

In other words, you can buy twice as many fighters as you spend the same amount of money.

This is definitely a huge temptation for the Air Force and the Navy.

In order to enhance the attractiveness, Cheng Fei also clearly stated that yj-31c and yj-33c can strengthen the strength of the fuselage mechanism, that is, it can reach the level of j-30 and j-32 through later improvements, and become a multi-purpose fighter with air combat with fifth-generation fighters.

Of course, this is just the saying of the aircraft manufacturer.

To become a typical air-control fighter, in addition to high enough maneuverability, it also requires a large amount of supporting equipment, which are very expensive.

In fact, Cheng Fei has been covering up the fact that there is not much room for improvement between yj-31c and yj-33c.

You should know that the basic technologies of j-30 and j-32 were at the level of the 20s, so the basic technologies of yj-31c and yj-33c were only at the level of the 20s. Chen Fei's yj-31s and yj-33s used the technology of the late 1930s, leading by ten years!

Not to mention, elastic composite materials and memory materials appeared in the late 1930s.

In this way, if the Air Force and the Navy adopt a flight plan, they will have to consider equipping the sixth-generation fighter jets in ten years or at most fifteen years later.

Obviously, a fighter jet only takes ten years, even fifteen years, is a huge waste.

If the Shenfei plan can ensure service for 25 years and has the ability to replace j-30 and j-32, then the Chengfei plan will not have much advantage in overall cost.

In fact, in a few years, the first batch of J-30 and J-32 that were serving will be retired.

It is not that these fighter jets have reached their service life, but that they are too strong in the war against Japan, and the body mechanism has reached the limit of fatigue intensity.

Of course, improvements can also be used to extend service life, but the cost of improvement is not very low.

In this way, the high-end version of yj-31s and yj-33s has become the best choice for the Air Force and Navy to replace the first batch of j-30s and j-32s. If the flying solution is adopted, even if the yj-31c and yj-33c can reach the level of air combat aircraft, it will be equivalent to purchasing more j-30s and j-32s.

There is no doubt that this is a very difficult question to make a choice.

However, Mu Haoyang doesn't have to rush to make a decision, because the verification test flight will take more than half a year and will not end until the end of June 2042.

After discussing with his mother Qi Tie and Yan Ying, the three of them believed that if Shen Fei could solve the troubles in the engineering stage and ensure smooth mass production, yj-31s and yj-33s are the best choices, and the Air Force and Navy will purchase some high-end models to replace some j-30s and j-32s.

The problem is that verification test flights do not involve engineering and manufacturing issues, but are used to solve technical problems.

To put it bluntly, the technology that works on the verification aircraft may not work in the large-scale engineering manufacturing stage, and may become a fatal problem. Not to mention other things, the delay of mass production of the F-35 series fighter jets several times is because they encountered major technical problems in the engineering stage.

In this way, the military has only one choice: to have both fighter jets undergo engineering trial production, that is, to first create a batch of prototype aircraft in small batch mass production, so that aircraft manufacturers can take this opportunity to solve engineering manufacturing problems, and the military can determine which solution is more feasible through engineering trial production.

Unfortunately, there is no such appropriation in the military budget.

To this end, Mu Haoyang had to let Cheng Fei fight with Chen Fei, that is, the aircraft manufacturer shall bear the project trial production costs, and the winner will receive military compensation during the large-scale procurement stage. To put it bluntly, the aircraft manufacturer must gamble for the huge orders of thousands of military aircraft.

Of course, this happened in the second half of 2042.

Although the fifth-generation multi-purpose fighter jet is very important and it is related to whether the Chinese army can gain air supremacy in future wars, the arms project is not just fighter jets.

At that time, the most urgent arms project was the Army's "future ground warfare platform."
Chapter completed!