The use of plastic in the fuselage is not new, and the famous F18 uses composite materials on a large scale, which is called a "plastic bug" by US Navy pilots.

However, Yang Hui's proposal is to be simpler and more crude, and directly use ordinary engineering plastics in the world to manufacture part of the body, which is unheard of, if it can be successfully used, the aircraft will be greatly reduced in weight and cost.

But now it is only a preliminary assumption, and no one knows the specific situation without testing, and no one raised objections, just looked at Yang Hui silently, wanting to hear what else Yang Hui had to say.

In Yang Hui's memory bank, there are countless mature design experiences, and it seems that the choice of engine is also quite tangled.

Small reconnaissance UAVs, must not be able to use the turbojet engine used in the model aircraft, the engine on the model aircraft is a complete joke on the military UAV, Yang Hui himself is embarrassed.

"Then let's talk about the choice of engine, our drone must be a propeller engine, which has two options: the first is to use a small piston engine, and the second option is to use a Wankel rotary engine."

The use of a small piston engine for power, which is a more used scheme for small low-speed UAVs, is relatively mature and is a very good choice.

The other is the Wankel rotary engine, which sounds quite strange, and ordinary people have hardly heard of it, even after the literal translation of its Chinese name of this engine, there are still very few people who know this engine.

The Wankel engine is also known as the rotary engine, and the rotor here is not the same as the rotor in a turbojet aero engine. Turbojet engines belong to turbomachinery and are typical external combustion engines. The Wankel rotary engine, on the other hand, is an internal combustion engine, and there is an essential difference between the two things.

There are many benefits to this type of internal combustion rotary engine. First of all, the volume is relatively small, only two-thirds of the piston engine; Then it is light in weight and runs smoothly; Finally, the structure is simple, and the connecting rod valve mechanism is directly thrown away; The operating speed at the same power only needs to reach one-third of that of the piston engine, which greatly improves the reliability and durability of the engine.

The disadvantage is that the fuel consumption is a little higher than that of piston engines, but it is no different from the piston engines used in aero engines.

The rotary engine was developed after the end of World War II, and it attracted some attention at the time, such as Mazda, which used it in automobiles, but it took decades of research and exploration. In the end, it was found that the most suitable place for this engine is still a small drone.

The smooth operation of the rotary engine alone can shine on the drone, the engine runs smoothly and the vibration is small, which can effectively extend the service life of the body, and can also improve the performance of the sensing device and provide clearer images, which is simply natural for a drone with a reconnaissance mission.

Internal combustion rotary engines are widely used in the United States, Germany, Britain, Israel and other countries: Harpy, Hermes, Shadow 200 and other UAVs, and achieved great success, and later even the Republic was hot. Such an engine was also developed: the CYS-208RT.

Now Yang Hui is ready to put the idea on this kind of engine in advance, it is okay to develop it himself, and it is okay to introduce this kind of engine that is not too important to military drones at a low price, which is a very good choice.

After Yang Hui gave his opinion on engine selection. Someone actually knew that this kind of engine invented by the Germans after the war was there, and after thinking about it, he immediately flew with his head up.

"Rotary engines are used on UAVs. This is definitely better than using a traditional piston reciprocating engine, which I see as having great potential for use on drones. You can spend money on it. ”

Hearing that someone supported him, Yang Hui took a more look at this technician who was originally only responsible for the improvement of model aircraft engines. Now this person who is not good is the most familiar with the rotary engine in the base besides himself, but he can train it.

Some people supported Yang Hui's proposed rotary engine, which made other people who didn't know about the rotary engine and hadn't even heard of it look at each other. What exactly is this rotary engine and why is it so attractive, you should look for information to see what it is after going down.

Without the right to investigate, there is no right to speak, the professor nodded silently, and his head showed understanding: "I don't understand the rotor engine you said, but judging by this comrade's reaction, this engine is indeed unique." In this way, I will give you the contact information of the UAV Research Institute of Xi'an University of Technology, I don't care about the development of the airframe, and the preparation of the fly-by-wire flight control rate here is inseparable from manpower. ”

After speaking, the professor wrote down a string of phone numbers on the paper and handed them to Yang Hui. Then he turned around and left, looking in a hurry, leaving Yang Hui and several key members of the UAV research and development team.

The professor is gone, and now he needs to arrange a new job, and the matter of contacting the UAV Research Institute of Xi'an University of Technology was honorably handed over to Yang Yue, the UAV project leader, by Yang Hui.

A serious to Yang Yue instructed: "Comrade Yang Yue, you used to be the person in charge of the model aircraft project, so the current UAV project should also be in charge of you, contact the West University of Technology over the matter will be handed over to you, UAV aerodynamic design, I need to study it well, and strive to come up with a good aerodynamic shape design." ”

After arranging the task of contacting the partner, Yang Hui left alone and walked to a pneumatic group, and now the UAV development team really can't get a talent who can specialize in pneumatic design.

Along the way, I thought about all the aerodynamic designs of small reconnaissance UAVs, if I just said that I came up with a decent UAV aerodynamic design, Yang Hui could copy it by hand, but now we must take into account more places, such as the inheritance of technology, and at the same time, it must be combined with the pre-research of advanced technology, which is quite a test of overall planning ability.

Thinking about it along the way, I found that in the aerodynamic design of the UAV, the only place that can overlap with the technology of the manned aircraft is the design of the vertical tail, the single vertical tail? Double vertical tails, or more perverted triple vertical tails, four vertical tails.

These can all be, but the most suitable for Southwest Science and Industry is the double vertical tail design, the double vertical tail design alone is not enough, Yang Hui should be in place in one step, directly into the V-shaped camber double vertical tail.

The cooperation between Southwest Science and Industry and Northrop has been relatively deep, and the cambered double vertical tail technology from Northrop has also arrived in Southwest Science and Industry.

"Liu Jun, what is the progress of the large-side strip wing technology verification aircraft you planned? Can you spare some manpower to study the camber double vertical tail technology that has just been transported to the base, we now have a new aircraft that can use this technology, which can be regarded as training for you, so as to speed up the digestion and absorption of technology. ”

Hearing that there is such a good thing, how can Liu Jun not be happy, although the current development of the large side strip wing technology verification machine is very tight, but it is absolutely feasible to transfer manpower and technical personnel from the location of the wind tunnel to start studying and digesting the newly arrived vertical tail technology.

"Of course, as long as the company needs it, we can send fifteen people out here, plus the technical information handed over by Northrop, we can start researching, but the time is a little bit off, it will take at least half a year. By the way, can you tell us a little bit about the new project you just mentioned? ”

Seeing Liu Jun's inquisitive eyes, Yang Hui couldn't bear to hide from him, Liu Jun is already the technical backbone of Southwest Science and Industry, and Liu Jun is indispensable for the new UAV aerodynamic design.

"There's nothing to keep secrets, it's just a large model airplane, and we have some new ideas that we can implement on this." (To be continued......)