Although Xu Xingchen from the Western Archipelago has already lying in bed, he has not yet fallen asleep.

After receiving news from the Southern Islands in the afternoon, Xu Xingchen felt distressed for most of the day, and after dinner in the evening, he returned to his room early.

After taking a shower, I went to bed and lay on the bed to count the recent gains, mainly the spoils (draws) and analysis (prizes).

Before the analysis, Xu Xingchen made sufficient psychological adjustments and repeatedly reminded himself not to get involved and calmly distribute the spoils.

First-level analysis, each time you consume 1 spoil, you can get equipment parts.

Level 2 analysis: 10 spoils are consumed each time and you can get complete equipment.

Level 3 analysis, each time you consume 100 spoils, you can directly obtain equipment drawings.

Level 4 analysis: each time 1,000 spoils are consumed, you can obtain the most advanced equipment drawings in service, or unlock certain new system functions, or add the exclusive core of the ship girl to the completed scientific research ship.

Level 5 analysis, each time consumes 10,000 spoils, you can obtain equipment drawings and supporting equipment, or large-scale comprehensive technology system technology.

This is Xu Xingchen's summary so far, among which the results of level 4 are the richest, while the results of level 5 analysis are only two types.

It’s not that Xu Xingchen can confirm that there are only these two results, but that Xu Xingchen has drawn two level five analysis times in total.

The first time is a "Three Five-Year Plan" air defense missile with an 850mm standard vertical launch system. The second time is a medium-voltage DC integrated power system.

Then Xu Xingchen had no spoils. Later, after he had spoils again, he felt that the level five analysis was huge loss.

Although the products are all good things, they are "too advanced" and cannot directly improve the actual combat effectiveness, so Xu Xingchen never drew it again after that.

With 120,000 spoils this time, Xu Xingchen is ready to take action again and try the depth of this fifth-level second son.

"three times!"

"Don't worry about what you draw, just draw three or five-level analysis!"

Xu Xingchen made a decision to take out one-quarter of the spoils to challenge this most advanced analysis.

Close your eyes and take a deep breath, try to calm your mood, then turn on the trophy analysis and press the button for the first analysis.

"The loot is being resolved..."

"Successful analysis: Obtaining variable cycle engine technology."

The moment the result came out, the scene was so quiet that Xu Xingchen recalled the last time he made a level 5 analysis.

Of course, things are good things, but these good things are products and tools when climbing up to the top based on the maturity of existing basic technologies.

The variable cycle engine technology is a technology that limits the oil consumption of fighter engines and maximizes the engine edge performance.

Most of the engines used by modern major fighters, large civil aviation passenger aircraft, and large transport aircraft are "turbofan engines".

This kind of engine has a very important parameter: bypass ratio.

The structure of this engine is similar to two cylinders that are wrapped together.

The inner small cylinder inside is the inner connotation channel, and the space between the outer large cylinder and the inner small cylinder is the outer connotation channel.

The ratio between the air passing through the outer duct and the air passing through the inner duct is the bypass ratio.

The main driving structure of these turbine engines is installed inside the connotation channel, a spindle, a compressor, a combustion chamber, a gas turbine, and the main driving structures of these turbine engines.

When the engine is working, atomized fuel is injected into the combustion chamber, and the combustion-heated air is "blowing" backwards, and at the same time, it "blows" the back to ignite the gas to rotate.

The high-speed gas turbine drives the compressor to pressurize and blow the air, which increases the pressure of the combustion chamber. The low-speed turbine drives the front-end fan to blow back the air, providing additional thrust.

In all these things, except for the blowing fan, everything else is inside the inner channel, and the outer channel is a simple ventilation channel.

Only the wind blowing from the large fan is blown backwards through the outer duct. The power provided by this part of the wind can be regarded as additional thrust.

Therefore, the larger the external bypass, the larger the bypass ratio, the higher the overall energy consumption ratio. With the same force, the more fuel-efficient the engine, but the slower the maximum speed.

On the contrary, the smaller the external duct, the smaller the bypass ratio, the lower the energy consumption ratio, the more fuel the engine consumes, but the higher the limit speed.

Therefore, fighter jets that pursue high-speed are basically small bypass engines, large civil aviation passenger aircraft and large transport aircraft that pursue economy and thrust are basically large bypass engines.

If the bypass is infinitely larger, that is, the pipe outside is directly cancelled and the fan is as large as possible and the air is as big as possible is blown as possible, it becomes a "turboprop engine".

If the bypass is infinitely smaller, it means that you don’t need a fan to blow the air. Just a simple jet will become a “turbojet engine”.

However, traditional turbine engines, regardless of the bypass ratio, are fixed after production.

The optimal fuel consumption state of these engines can only be at a specific power, and can only push the aircraft to fly at a relatively fixed speed.

Flying other speeds consume more fuel and cannot get the optimal performance.

The civil aviation passenger plane is fine, but basically it flies smoothly after the sky, and continues to fly at high subsonic states to "cruise at a fixed speed".

It's like driving on the highway, the state is very stable and fixed. The technicians only need to work hard to optimize the fuel consumption in this state.

The actual effect is also very obvious. Nowadays, the aircraft with the best subsonic performance are all large civil aviation passenger aircraft...

However, when fighting aircraft are fighting, the speed will definitely continue to change within a large range, and it is impossible to cruise at a fixed speed if you have to do various maneuvering actions.

This state is like driving into the city, passing through the farmers' market, and going to the small alleys in the old city. Don't think about the best fuel consumption or something.

Especially now, the latest generation of fighter jets not only need subsonic supermaneuverability, but also "supersonic cruise", which means that there are two cruise speeds, which will cost you life.

This is just like the design requirements of the early third-generation aircraft in the 1970s. It must not only have sufficient low-speed maneuverability, but also catch up with the high-speed performance of the second-generation aircraft...

So the technicians at that time formed a "variable angle wing", a product of technology in mechanical design and manufacturing processes...

Now, the new demands of the new century have recreated the story of that year on the new generation of equipment.

This time, technicians developed the concept of "change cycle engine".

In the final analysis, it is all about "changing". What has been changed this time is not the sweep angle of the wing, but the bypass ratio of the engine.

When flying at low speeds, the bypass ratio is expanded, and the cruise is more fuel-efficient. When flying at supersonic speeds, the bypass ratio is reduced.

Obviously, this technology with ultimate performance has the same difficulty as the variable wings of that year, that is, the manufacturing process and control procedures.

Since the system has given me mature "technology", it means there is a solution here, which is definitely the top high-tech.

The problem is that this technology that goes further, like the previous Red Flag 35, is of little practical significance to Xu Xingchen's fleet.

With a complicated mood, Xu Xingchen clicked on the detailed description of the result, and then was stunned.
Chapter completed!