Chapter 1518 Different paths lead to the same destination

"UAV..." Sun Cong pinched his chin and thought for a while, then asked uncertainly, "The accuracy requirements of the aviation command and landing assistance system for ship-borne UAVs are much higher than those for manned aircraft. Does the Liaosheng currently have this capability?"

Luo Yang waved his hand:

"There were risks originally, but the comrades at Lianhai Shipyard said that they had carried out a special equipment modification before this voyage, and now there is no problem... at least there is no problem in dealing with a single drone flight."

After saying that, he turned to look at Li Chunpeng:

"Comrade Chumphon, what do you think?"

However, the latter's mood at this time was more complicated——

At least in the current aviation industry system, the status of drones, especially small and medium-sized drones, is still half a level behind the main manned aircraft models.

即便像是无侦7/8/9这样的战略型号，研制工作也仍然由单一设计室主抓，而无法像歼15或歼20那样上升到集团层面。

From the perspective of the entire pre-research office, being able to obtain resource supplements from the Shengfei Group will undoubtedly help them conduct more in-depth research on the full-tail layout.

But he could not be sure whether this "drone project" was just used for technology verification or would develop into a complete project that required finalization and acceptance.

If it is the latter, then he himself is likely to miss the critical stage of the "Snowy Owl" project becoming a regular project...

Fortunately, as someone who had experienced this, Luo Yang quickly guessed what Li Chunpeng was thinking.

Young people are simply afraid that their achievements will be taken advantage of by others.

Although he had left college for a long time, he knew that this situation was not uncommon in the academic circle.

"Don't have too much psychological burden."

This sudden statement left Li Chunpeng a little confused.

But soon, Luo Yang continued:

"If you plan to focus on the theoretical research of the tailless aerodynamic layout and really can't spare the energy to deal with the specific development of a UAV model at the same time, you can also recommend a comrade you think is suitable to be responsible for solving other problems besides aerodynamics."

The meaning of the words is very clear -

The entire project revolves around you, so don't have any concerns other than the technical level.

It not only dispelled the former's worries, but also helped him establish a down-to-earth image of being "modest and hardworking" in the minds of others.

Instead, Li Chunpeng felt embarrassed:

"Don't worry, Mr. Luo. I should be able to take care of both."

Seeing that both parties had reached a tacit understanding, Luo Yang nodded:

"You have been communicating with the Aviation Power Group. You can ask Academician Chang Haonan from the group for advice. He has more experience..."

Sun Cong also added:

"That's right. I remember that at the peak of his career, Academician Chang was in charge of the development of three projects at the same time, and he was able to hold meetings for us with ease..."

The atmosphere at the scene suddenly became relaxed...

Li Chunpeng scratched his head:

"I heard about this from the comrades at the Aviation Power Group... Academician Chang is now in charge of the development of hypersonic aircraft. He is usually in Huairou Science City. I wonder if he has time to follow up on the tailless aircraft personally..."

……

The answer, of course, is yes.

In fact, when Chang Haonan saw the completely tailless layout plan in front of him, his first reaction was overjoyed.

Because one of the main problems facing hypersonic aircraft is the balance between control efficiency, air resistance and flight stability.

For a missile, whether it is a gliding or air-breathing type, it does not require very high aerodynamic control efficiency. Even if it needs to adjust the trajectory or maneuver at the end, it can be achieved by changing the center of gravity or more simply and crudely using a side thrust rocket.

But if it is an airplane, the requirements must be much more stringent.

The gas rudder cannot withstand the temperature of the scramjet engine's tail flame for a long time;

If the air rudder area is too large, it will be a drag burden, and if the area is too small, it will not achieve sufficient control efficiency.

Vector propulsion is not suitable for ramjets, and it is impossible to rely solely on vector propulsion to maintain stability at ultra-high speeds...

Therefore, at the end of the research, the solution he came up with was almost the same as Li Chunpeng's -

The fuselage of the parallel waverider body is of course very different from the lifting body structure of a conventional aircraft, but the idea of ​​"removing all tail fins, using supersonic flow field compression and expansion flow to achieve aerodynamic stabilization, and combining embedded control surfaces to achieve flight control" is exactly the same.

Moreover, considering that hypersonic aircraft still need to rely on their own power to achieve the starting conditions of the dual-mode ramjet engine, the similarities between the two in terms of body layout must be more than theoretical...

"Is this the solution you came up with after internal discussion?"

He put down the information in his hand and looked at Li Chunpeng with shining eyes.

The latter had never seen such a scene before and nodded hesitantly:

"It was originally an idea from our pre-research office, but it has been confirmed by the group. Mr. Luo also promised to allocate some resources to us for technical verification."

"Okay, very good!"

Chang Haonan could no longer suppress the upward curve of his mouth, so he had to drink water to cover it up.

Originally, he was troubled by the fact that he was unable to handle all the tasks at once and could not find a capable helper, so he planned to slowly solve the aerodynamic layout problems after the dual-mode ramjet engine.

But when I feel sleepy, someone will hand me a pillow.

Isn't the helper coming soon?

Of course, no matter how excited he was, he couldn't immediately entrust such an important task to a junior who was a few years younger than him.

Anyway, first find out:

"Comrade Chumphon, what are the main problems you are facing now?"

"It's missing a grip."

Li Chunpeng opened the 3D rendering again, then turned the computer 180 degrees towards Chang Haonan and explained:

"We have determined the basic feasibility of aerodynamic stabilization design at the theoretical level through a clean idealized aerodynamic model, but the actual aircraft faces much more complicated situations than the aerodynamic model. For example, there are pilots, a cockpit, mission payloads, a bomb bay, and fuel consumption during flight, so the relationship between the center of gravity and the center of lift is not static... All of these will affect the effect of aerodynamic stabilization."

"To turn the idealized model into a real aircraft, a series of parametric designs need to be completed, but we are not sure where to start."

The control torque of conventional aircraft is essentially provided directly by a physical structure, so aerodynamic design is a process of addition and subtraction.

However, due to the aerodynamic stabilization effect, the aerodynamic design of the tailless layout at least belongs to multiplication and division, or even power operations, and has at least two more degrees of freedom than the conventional layout.

It is indeed not easy to find an entry point at the moment.

"The forebody design has little to do with what we are discussing today, so we will only consider the posterior body issue."

Chang Haonan enlarged the model, then picked up a pen and gestured at the tail surface:

"The main control curves of the unilateral rear body surface include a rear body ridge curve and two rear body control section curves, so the relevant surface parameters can be summarized into three items: the rear body lateral projection area, the rear body ridge shape and the rear body control section shape..."

"..."

At first, Li Chunpeng thought that the other party would at most provide him with a general direction, so he just listened carefully.

But he soon realized that this was a rather complete research plan and it was impossible to remember it in his mind.

"Academician Chang, please wait a minute. I will write it down..."