The Goddess Shines on America

There is no doubt that yf-22 is the predecessor of f-22.

The f-22 Raptor fighter was jointly developed by Lockheed Martin and Boeing. It is the world's first single-seater dual-engine high stealth fifth-generation fighter. It entered service with the U.S. Air Force in the early 21st century to replace the fourth-generation fighter. The main aircraft type is the f-15 Eagle fighter.

In this project, Lockheed Martin is the main contractor, responsible for designing most of the airframe, weapon systems, and final assembly mitigation. The planning partner Boeing provides wings, rear fuselage, avionics integrated systems and training systems. At least as far as Alice knows, their distribution should be like this.

It's just that the current actual situation has some deviations from her memory, that is, the avionics system is also in charge of Lockheed. Of course, this kind of situation that will occur as long as there is a slight deviation in the negotiation process, of course, will not surprise Alice how much. Compared with understanding the comprehensive details of the entire project, this subtle difference is completely insignificant.

Currently, the relevant person in charge of the project, Joseph, introduced the relevant data of the product they are currently bidding on, yf-22.

First of all, this new type of fighter, planned to be the fifth-generation fighter, is designed to have a maximum speed of Mach 2.4, a maximum ceiling of 200,000 meters, and a combat radius of about 650 to 700 kilometers. As for its weight, in principle, of course, the lighter the better, but as a representative of a heavy fighter, its maximum take-off weight is still as high as about 22 tons.

"During the development process, we borrowed a lot of the technology and experience of the f-117a, because its stealth performance is very good. At the same time, we also pay attention to overcoming its multiple oblique cones, and the cockpit aerodynamic performance is not ideal, The drag is too large, and it can only do the shortcomings of subsonic flight."

Having said that, Joseph couldn't help but stop seeing Alice just nodding her head.

"I take the liberty to ask, Alice, although you are an expert in the field of computer programming, but in the field of aircraft development... can you understand what I said?"

In order to avoid wasting effort and to better organize the next language, Joseph felt it was necessary to ask.

"Of course I can understand."

Alice could guess what Joseph was hesitating, and smiled: "I taught myself college physics when I was ten years old, and what's more, what you are talking about right now is not very professional. Please continue."

Seeing Oren nodded to himself, and smiled bitterly, Joseph had to continue talking.

"So, based on the shape of the f-117, we designed the nose of the yf-22 into a pyramid shape, with two air inlets installed along the lower **** of the pyramid, and the air inlet cross-section is a parallelogram, which is different from conventional aircraft. However. At this point, we need to make a trade-off. Although the stealth effect of the air intake under the wing is far inferior to that on the wing, it is extremely conducive to improving the aircraft's maneuverability at high angles of attack."

"This is a problem with the nose and air intake. As for the wing, we used a large root-to-tip ratio, that is, a trapezoidal wing with a large root-to-wing tip ratio. The sweep angle of the leading edge is 48 degrees, and the trailing edge The sweep angle is about seventeen degrees. Choosing such a wing is conducive to prominently improving the maneuverability of the aircraft, increasing the aircraft’s supersonic cruise capability, and meeting the needs of stealth. At the same time, in order to reduce the interference between the horizontal tail and the vertical tail, We designed to tilt the twin tails only 27 degrees outwards, which means...small."

Whenever arranging technical terms, Joseph carefully adopted more understandable terms, carefully observing Alice's expression, for fear that she would appear confused or pretend to understand.

Fortunately, he was relieved that the girl who appeared abruptly seemed to really listen. It can be seen from the look in her eyes that she is really thinking about her introduction instead of pretending to be deep.

“As for the pilot’s cockpit, we set it as a bubble type with a good view. At the same time, the plane tail, tail support, binary nozzle and the trailing edge of the tail cone all have irregular jagged shapes, which are mainly for scattering from Enemy radar waves from behind."

"In terms of power source, we plan to adopt thrust vectoring nozzle technology, so in terms of cost..."

"Excuse me, interrupt."

Alice raised her hand and said, "Excuse me, please explain, what kind of technology is this thrust vector nozzle?"

Asking if you don't understand, this behavior can't help making Joseph more at ease, and every engineer present can't help but breathe a sigh of relief. Yes, yes, at least as far as the current situation is concerned, this girl who was suddenly invited into the house by the boss would be an excellent partner.

"Thrust vectoring technology refers to the thrust component generated by the thrust of the engine through the nozzle or the deflection of the tail jet. With this technology, it can replace the control surface of the original aircraft, or enhance the control function of the aircraft, and can carry out the flight of the aircraft. Real-time control."

Undoubtedly, military aircraft research and development is a project that integrates technologies in many fields. When countless technologies are concentrated on a single aircraft, every seemingly unrelated combination is inseparable from each other. relationship.

From the shape of the aircraft, the design reasons for the shape, to the specific parameters of the aircraft and the engine, and what technology the engine adopts, all this information will be closely related to the airborne avionics system. It is conceivable that if the person who wrote the system did not understand the performance of the aircraft, his work would not be suitable for this aircraft.

Therefore, the atmosphere of this meeting became more relaxed as Alice raised questions one after another.

"The specific impact of this control... Could you please elaborate a little bit?"

"It is to turn part of the engine's thrust into control force."

Joseph readily answered for her: "This approach can greatly reduce the radar reflection area. At the same time, no matter how large the angle of attack and how low the flight speed, the aircraft can use this part of the control force to control, which increases the controllability of the aircraft. Sex."

"Moreover, because the control force is directly generated, and the magnitude and direction are variable, this also increases the agility of the aircraft, so we can appropriately reduce or remove the vertical tail. Obviously, the fewer parts, it will The harder it is to be detected by radar, it can also reduce the drag of the aircraft, reduce the weight of the structure, and even reduce the cost."

From every design of the aircraft to the specific reasons for each design, Joseph made the most detailed introduction to Alice on every detail of the entire aircraft without having to compare any documents. After all, it took him an entire hour just to summarize the content.

The real time of the whole meeting is much longer than this. When Joseph talks about some key points, Alice will ask questions very targeted. Furthermore, with the increasing number of questions, the frequency of the 30 people in the audience exchanging eyes increased.

There are very simple questions that Alice didn't mention. Every question she asked had an incisive point, and it often required Joseph's tirades to explain it thoroughly. In this whole process, a very strange situation was gradually discovered by everyone.

At the beginning, Alice was puzzled by some very critical and unusual technical terms, such as the "thrust vector technology" initially asked. However, as the introduction continued, Alice's questioning gradually changed from being incomprehensible to a rhetorical attitude.

"Why take this angle? Isn't that angle better?"

"The area of ​​the blades of the engine must be related to thrust, right. Too wide and too narrow has both gains and losses. What we need to do is to take the middle amount, right. So, since this engine uses this size, this is the effect, that size It’s the effect. Wouldn’t it be better if you use this size?"

These questions seemed to be raised casually, but there were 30 people present, and only Joseph kept talking. When he kept talking about these familiar materials, others who were idle naturally couldn't help but ponder it. Alice's opinion seemed very reasonable.

Even Joseph himself, constantly faced with Alice's problems one after another, has become more and more stunned.

Why is this angle, not that angle?

This area and that area are not good, what about this area?

It seems to be just saying a random number, but the 30 people present here think about it carefully, and it seems that this number...is the most appropriate number!

The meeting officially started at 9:30, when the time was approaching lunch, Joseph and Alice, the question-and-answer relationship between the two had quietly changed.

"Let’s talk about invisible coatings. You ask me if there is any way to reduce costs, right? Nano coatings are in the right direction, but are you too obsessed with those expensive elements? Think about diamonds, but just Changing the order of carbon atoms can form such a strong substance. For something as expensive as stealth paint, if we can find a relatively cheap substitute, isn't it the best price range?"

"Don’t, don’t tell me about the problem of making money. I don’t understand how small profits but high sales are. According to the paint you told me, the final cost of this aircraft must be over 100 million yuan, plus various late-stage costs. It’s three to four billion! At such an expensive price, it’s a big profit to sell one or two, but only one or two can be sold!"

"Hurry up and give me a try with that element! Yes, yes, UU read the element at www.uukanshu.com, oh, don’t cling to your element, please read the chemistry book, OK? My refinement process of this element, Twice cheaper than yours, use my element, and then try it as a substitute, I don’t believe that the cost will not come down!"

At the end, Alice patted the table with angrily face, as if Joseph was a schoolboy who could not even know one plus one. Why didn't he find such an obvious answer?

Yeah, why didn't you find it?

Joseph thought of Alice's suggestion empathetically. It seemed, seemed, and was almost the same. The element she proposed could really be a substitute for reducing costs.

So, creativity and inspiration are sometimes so disgusting.

Knowing means knowing, not knowing means not knowing.

Why didn't you think of it?

Joseph was really depressed. (To be continued.)