The suggestion in Chapter 523 was a bit loud
So when I saw this, the comrade who was doing Attack-5 felt like I was a fool. Why didn't I think of such an obvious problem?
"Goose eggs...", yes, this unit is the one that asked Gao Zhendong about 16mm and 8mm steel cables last time.
Fortunately, we are only doing static tests now, and it has not yet arrived for the first flight. We have not built many prototypes, just a few, so the loss is not big.
It seems that the cannons can only be placed back to the wing roots. The original reason why Mr. Liu placed the cannons at the wing roots on the nose is unknown.
However, Gao Zhendong estimated from the drawings that it might be because the original tip was improved to obtain a better downward view, but there was no good equipment to install inside, so he simply moved the cannon at the wing root here and put the wing The space at the root is saved to hold oil.
If this thing in the letter can be understood at a glance, then the next sentence is not so easy to understand. At least for the current G-5 designers, this thing cannot be thought of at all, or in other words I thought about it but don't know how to deal with it.
“In view of the fact that the supersonic performance requirement of the aircraft is lower than 1.5, the deterioration of the total pressure recovery coefficient of the designed D-type inlet duct at supersonic speed is still within the acceptable range, but the design of the inlet duct While ensuring sufficient air intake at low speeds, the problem of engine surge that may be caused by large air intakes at high speeds is not considered. It is recommended to consider adding a high-speed exhaust port.” Mach 1.1 is barely supersonic speed, and the multi-wave system inlet with adjustment seems somewhat unnecessary. Although the attack-5 at this time, due to the dividends brought by 591, tungsten-molybdenum alloy, and computer technology, the thrust is higher than The original one was much bigger and faster.
However, Gao Zhendong has estimated that this speed still does not reach the level that requires multi-wave system inlets. Gao Zhendong is not prepared to complicate things. In view of the fact that our economic situation is still not optimistic in the future, Gao Zhendong still wants to be simple and usable.
However, the air intake situation of the engine is not constant at high and low speeds, so at low speeds, the air intake may be insufficient. Later fighter aircraft generally used auxiliary air inlets.
However, at this time, due to the small speed span range, this problem is not prominent. Generally, a one-trick method is used without an auxiliary air inlet.
In this way, the intake air flow at low speeds can be guaranteed, but the problem that large air intakes at high speeds may cause engine surge has arisen. Although the aircraft has not yet been tested at this time, no discovery has been made. , but hidden dangers exist, and they may even be exposed earlier than what Gao Zhendong saw in his previous life.
Because the attack in this world is -5, he is born to fly faster than what he saw in his previous life! Because those two engines are better.
If you fly fast, problems will naturally arise. Good things bring new problems. Who can you ask to explain this? In the previous life, Mr. 5 also used an improved engine in the remodeling. After the thrust increased, he had to start solving this problem.
Several designers who were reading the letter looked at each other and did not scold themselves for being stupid this time. This thing is different from the cannon layout. It is indeed unexpected, but it is more uncomfortable than doing something stupid. It shows that when designing, consider Still not thoughtful.
If these two suggested changes are relatively minor, they are just tinkering, and they do not have a subversive effect on the design of the aircraft, then the words in the following letter are a bit disappointing to the designers of G-5 Shocked.
“In view of the short combat radius of the current design of the aircraft, it is recommended that the wing-body fusion method be considered to increase the internal volume of the aircraft and reduce the drag to increase the lift-to-drag ratio, which will also be beneficial to the rigidity of the aircraft body. Impact, properly designed, can effectively reduce the weight of the aircraft. "
The typical example of wing-body fusion is Citigroup's F-16, which is really beautiful.
Not many early fighter jets are as thoroughly integrated as the F-16. Although other fighter jets with wing-body fusion have different integration methods and degrees, the benefits of wing-body fusion are still there, it’s just a matter of quantity. That’s all.
From a comprehensive perspective on wing-body fusion, the larger the size of the connection between the wing and the fuselage, the more benefits will be obtained. Of course, there will also be more disadvantages, such as reduced stability. But this does not mean that only aircraft such as flying wings, tailless delta wings, and truncated delta wings can use wing-body fusion.
Seeing this, the comrades at Cidu Aircraft Factory were very curious.
Wing body fusion? What new technology is this? I can understand it literally, but when it comes to technology, it is still taboo to take the literal meaning literally.
Although they didn’t understand, they couldn’t help but be tempted by the many benefits in the letter. Everyone looked down excitedly, wanting to see what this “wing-body fusion” was, and then they discovered...< br>
Gone!
This thing breaks right here!
Dig a hole and run away!
This will have to be put aside for decades, and Xiantian Net's holy body will belong to it.
But the comrades at Cidu Aircraft Factory don’t know what online writing is now. They only know that it is very uncomfortable to break.
Several comrades looked at each other, and finally Mr. Xiao, who was in charge of the model, comforted everyone and said: "It's okay. Since the National Defense Work Committee has forwarded this letter, I think if we are really interested, we should have no problem asking the National Defense Work Committee. .”
Then everyone cheered up and continued to look back.
The words in the next letter may bring even greater changes to the aircraft. "The aircraft is designed with a built-in bomb bay, but considering the aircraft's tactical mission, the bomb bay is not necessary. Instead, it will cause a sharp decrease in the amount of fuel in the aircraft, seriously affecting the combat radius. Recommendations The built-in bomb bay is cancelled, and the weapon is fully external. "
The basic version of the G-5 has a built-in bomb bay, but when it comes to major modifications, this is the first thing to be changed. .
The main reason is that after using it, the Air Force found that the benefits originally hoped for were basically not obtained at all, but there were a lot of disadvantages.
With the built-in bomb bay, it was originally hoped that under extreme circumstances, it could carry two 250-kilogram aerial bombs and carry out low-altitude supersonic penetration in a smooth configuration. It is said that based on the battlefield environment in the future, this kind of The success rate of penetration method is the highest.
However, the G-5 with this structure has too little internal oil. Even with two auxiliary fuel tanks, it is only more than 3,000 liters.
In addition, the fuel consumption of low-altitude penetration is already high, and the combination of weak and weak makes it worse. As a result, its "low-low-low" profile combat radius is only more than 200 kilometers, which can be regarded as a typical airport defender.
This pair of auxiliary fuel tanks that must be mounted before launching the attack makes the supersonic speed of the attack-5 that can barely reach it completely meaningless. Before launching the final attack, don't even think about using supersonic speed to drive.
In fact, the comrades of the Porcelain Flying Factory are not unaware of this problem, but this matter... In addition to technical issues, the biggest problem is the requirement itself, which was not decided by them.
In Gao Zhendong's letter, he also calculated the benefits of the in-machine fuel tank.
“According to my preliminary calculations, even without the use of wing-body fusion technology, the internal bomb bay is changed to an internal fuel tank. It is conservatively estimated that the fuel volume in the aircraft can reach more than 3,500 liters. If additional With the wing-body fusion, it is expected that the fuel capacity can support the aircraft's "low-low-low" profile, high subsonic penetration, and a combat radius of at least 4,000 liters of external aerial bombs. Reaching about 300 kilometers. "
In fact, the low-altitude penetration speed of Mr. 5 with bombs is also high subsonic. In comparison, this "removal of bombs and oil replacement" actually brings benefits but no losses. something.
"If a low-resistance auxiliary fuel tank is added, the total fuel volume is expected to reach more than 5,000 liters. Using the 'high-low-low-high' profile, the combat radius is expected to reach more than 600 kilometers."
< br>The distance you can run is longer, and you no longer need to enter at a low altitude at the beginning. It is also safer to fly higher in the first half and save fuel.
Gao Zhendong's suggestion was based on Mr. Wu's later improved model, which had an internal oil capacity of about 3,700 liters while remaining basically unchanged in size.
Although this amount of fuel seems to be similar to that of using an internal bomb bay and an auxiliary fuel tank, it is different if an external auxiliary fuel tank is not mounted. The efficiency of external fuel is far less than that of internal fuel. Even if When a bomb is hung on the pylon of the fuel tank, the resistance of the bomb is still smaller than that of the auxiliary fuel tank.
For this data, the comrades at the Porcelain Flying Factory also had expectations, but I was still very excited when I saw the comrade who wrote the letter calculated it in black and white. Moreover, this comrade’s reasons were very sufficient and his analysis was also very accurate. The attack of the bomb bay is -5. In fact, there is really no way to penetrate the defense at low altitude and supersonic speed.
But no matter what, what users want is a built-in bomb bay.
Reading further, the comrade who wrote the letter made a very considerate suggestion: "Considering that the design of the built-in bomb bay may be directly related to the initial design requirements, it is recommended that the designer make sufficient theoretical calculation preparations. After that, we will explain the advantages and disadvantages to the users in the hope of making changes.”
Um? Does this require us to go directly to the Air Force and overturn the original technical and tactical requirements? This comrade's tone is not trivial. He thinks too simply.
But Mr. Xiao’s idea is different.
“The National Defense Work Committee forwarded even this part of the recommendations as they are, does that mean...”
A researcher said excitedly: “Mr. Xiao, you mean, the prevention The Working Committee also has this idea? ”
The idea of the Defense Working Committee is definitely not exactly the same as that of the Air Force. If the Defense Working Committee all has this idea, then this matter is not completely monolithic.
Mr. Xiao did not answer directly, but turned to look at a key person.
"Please follow the comrade who wrote the letter and do some calculations and analysis carefully. In any case, doing the calculations will help increase our design experience."
This person The backbone looked excited: "Okay, Mr. Xiao, I'll finish it as soon as possible!"
After arranging this matter, they looked back at the last suggestion in the letter. After reading this suggestion, comrades from the Porcelain Flying Factory, you Look at me and I look at you, I feel like this smell is not right.
"Mr. Xiao, why do I feel like this comrade is trying to pull our plane back to the original road?"
(End of this chapter)