The fourth-generation heavy battle definitely needs to be studied carefully, but at this time, the plans of the 611 and 0111 units have completed almost all the aerodynamic tests in the early stage, and at this time they have almost entered the stage of airframe structure design, and all that is needed is to complete the arrangement of the airframe space according to the design indicators required by various military requirements. Pen & Fun & Pavilion www.biquge.info

In order to notify the two units, and also to be able to see the renderings and scaled models of the two schemes faster, Yang Hui chose to visit them one by one.

0111 Institute Yu Chief Engineer presided over the early aerodynamic design, but at this time the detailed design of the heavy four has been taken over by the original J-18 Chief Division, thanks to the J-18 project has accumulated rich experience in twin-engine combat design, this time after taking over the design of the heavy four, or can clearly know how to design in various places.

When Yang Hui arrived at the conference room, he could still hear his calm and powerful voice, and he was mastering the design of focusing on the four overall aspects.

"For the design of the tail wing, should be the focus of our program, at least in terms of the current aerodynamic design, the world is the only one we do, although the theoretical and simulation tests have shown that it has a good aerodynamic and stealth effect, if it can be successful, this is a major engineering breakthrough comparable to our development of DSI air intake, but this is our structure, flight control design is very challenging....."

Yang Hui outside the door is also confused, this year to carry out new technological innovation is not possible, this makes people curious about how the tail wing of the heavy four is designed, Yang Hui has not seen the pneumatic scheme of the 0111 Institute before, and I feel that the design is also very conventional!

There are 10,000 unclear in his heart, but Yang Hui still knows very well that it is not convenient to disturb at this time, so he quietly found a seat near the corner and sat down, and wanted to take out the notebook he carried with him to write down the key points, but when he thought of it, all he talked about here was key top-secret information, even if he wrote it down, there was not much need, and he couldn't take it out anyway.

The chief engineer on the stage are all colleagues who have been in contact with Yang Hui for many years, and they also watched Yang Hui take the 011 base of the year step by step to this point, and it is clear that General Manager Yang is not the kind of person who likes to put up a shelf.

After knocking on the table, the other participants were brought back to the meeting from the new theme: the structure of the heavy four is designed to be distributed in the space of the box section.

"Continue the design of the tail, before this aircraft used the J-18 tail development of the past full-motion horizontal tail plus camber double vertical tail, but in order to achieve higher maneuverability, the vertical tail uses a full-motion design, which everyone should know, before there were psychological expectations to prepare, then the problem now is because the model in free flight exposed the problem of poor course stability, so temporarily added an incanted ventral fin."

What is revealed in this is still an old problem, the pelvic fin that has been spurned by the fourth-generation aircraft was originally abandoned in the fourth-generation heavy annihilation of the 0111 Institute, but now there is a problem, so the pelvic fin is added back, which Yang Hui didn't know before.

As for the so-called four-generation heavy battle of the tail design just heard at the door is very challenging, it is a new invention comparable to the DSI air intake, which is probably the full motion vertical tail, this technology has not been practical before, a little heavy four is used, it is indeed a breakthrough design.

It's just that the design of this pelvic fin is really necessary to be reorganized, if that's the case, it's simply a cancerous existence, can't you use other methods to solve the problem?

Yang Hui on the side was already heartbroken for the design of this pelvic fin, but the other backbone designers attending the meeting were calm, and did not cause the slightest fluctuation in the design of the evil pelvic fin.

With doubts, the explanation continued: "Now in order to be able to give this project a good aerodynamic stealth capability, we have engineers proposed to tilt the flat tail downward at a certain angle to form a layout similar to the American F-4 combat flat tail, on the one hand, it can improve the stealth ability of the flat tail, and at the same time, the downward inclined flat tail can also play a role similar to the pelvic fin to help stabilize the course stability of the fighter." ”

In any case, this is definitely the first time I have heard of the use of a flat-tail downward tilt design scheme similar to the F-4 fighter, which can also play the role of stealth and balance the course, but after listening to the previous introduction, the strange flat-tail design of the F-4 appeared directly in my head, and it does look very distinctive.

Similarly, this flat-tail design scheme similar to the F-4 fighter jet, you can almost see the heavy quad tail design this time as an F-4 fighter with a camber double vertical tail, this design does have a bit of a weird taste, but it looks like it is reliable at first.

As for whether this flat-tailed downward tilting design can play a certain stealth role, this point can also be answered after a little thought, and theoretically such a design can have a very good effect.

According to the conclusion reached by the United States when it explored the aerodynamic stealth technology of fighter jets, at least the SR-71 is being developed and used, and the design of its vertical tail is not a double-vertical tail design, but the inwardly inclined vertical tail is more excellent in stealth effect.

That is to say, the vertical tail of the fighter can have a good stealth effect regardless of whether it is tilted inward or outward, and another conclusion can be drawn in the same way, whether the flat tail of the fighter is tilted upwards (cambered double vertical tail) or downwards (cambered pelvic fins), they can have a good stealth effect.

And this time, the heavy four scheme is to use a pair of full-motion camber double vertical tails, a pair of down-tilting flat tails or a large team of full-motion camber flat tails can also do, anyway, in general, the game is in one sentence: because of the lack of stability of the course of the fighter in the previous design, this seemingly compromised design was finally adopted.

And after thinking about it carefully, you will find that after the combination of this outward tilt tail and a pair of large down-tilting flat tails, its effect is actually somewhat similar to that of the X-shaped tail rudder in nuclear submarines, except that the camber angle of the upper vertical tail and the downward tilt angle of the flat tail below will definitely be different, otherwise the downward-tilted flat tail will wait to touch the ground directly. (To be continued.) )