Chapter 537

It's not surprising that this press conference showed this way. T-shaped vertical tail, also known as high horizontal vertical tail, has many advantages. For example, it can increase the control arm of the pitch angle, so that the vertical tail of the aircraft can be made smaller and lighter, so as to improve the maneuverability of the aircraft and reduce the total structure at the same time.

For another example, the T-shaped vertical tail has little disturbance from the engine and wing, and the cruise resistance is small, so it can help the aircraft to obtain greater speed in the level flight state, especially in the subsonic state of the aircraft or business aircraft. Under the same power, the cruise speed of the T-shaped vertical tail is higher than that of the traditional vertical tail.

However, T-type vertical tail has many advantages, but it is not omnipotent, because its defect is also very obvious, that is, it is easy to stall at high angle of attack, and it is difficult to change, resulting in serious air accidents.

This is mainly because when the angle of attack of the aircraft with T-shaped vertical tail reaches a certain degree, the angle of attack of the aircraft will automatically increase due to the torque addition factor, and there is no obvious shaking, tremor and other stall characteristics in this process. When the pilot finds out and wants to change out, he finds that the whole aircraft is out of control, and can only rush to the ground in a scream.

This is also an important reason why the Soviet Tu 154 airliner is not inferior to the Western airliner in level flight speed, range and passenger capacity, but it can not be compared with the Western airliner in safety.

Because of the T-shaped vertical tail and the rear engine, the center of gravity of the aircraft moves further backward, resulting in increased torque. Once the pilot's operation error causes the angle of attack of the Tu 154 aircraft to exceed the critical range, the entire aircraft will stall. At that time, there is no choice but to destroy the aircraft and kill people.

MD-82 series aircraft are also of the same type. However, McDonnell Douglas company has done a good job in public relations. In addition, the detailed production of the flight manual stipulates that the maximum angle of attack of MD-82 series aircraft should not exceed, and it is strictly controlled by the computer. This does not make MD-82 series aircraft become a flight coffin like figure 154. However, compared with the same type of aircraft, the accident rate is still higher A lot.

Because of this, whether it is a large aircraft or a small aircraft, the aircraft with T-shaped vertical tail configuration in the take-off and climb stage is like a lady of the family. It is impossible to rush up at a high angle of attack, but will go up slowly, fly slowly, and then show its speed and maneuverability in level flight. The reason is that it is afraid of a pull-up Didn't do a good job, stalled the plane.

But the newly launched tm-9 has broken this Convention. Although it does not show the abnormal degree of 65 degrees and 70 degrees as those of European and American fighters, it is also close to 50 degrees. Although the engine is located at the front end, compared with the rear engine, the configuration of the center of gravity of the whole aircraft is more reasonable, but the T-shaped vertical tail layout is easy to lose control at high angles of attack The law of speed will not change.

Unless

Several experts looked at each other, and one of them said in surprise, "can their pilots control the plane so accurately?"

As soon as this remark came out, without waiting for other people to answer, the reporter who asked the question shook his head vigorously: "impossible. The stall of a plane with a T-shaped vertical tail at a high angle of attack is 1 to 3 degrees, and it is impossible for a delicate person to control it so precisely."

Several other people nodded with approval. They were all senior media people in the aviation field. They knew how difficult it was to control the angle of attack from 1 to 3 degrees. Maybe they shook their hands a little and the angle was unconsciously transferred to the plane by the pilot, and then

"Just launched is the tm-9 aircraft developed and produced by Royal Thai aerospace industry company, and also the first aircraft in Southeast Asia to adopt fly by wire control system..."

Just as the reporters were puzzled by the fact that tm-9 aircraft adopted the T-shaped vertical tail layout but dared to fly at high angles of attack, the commentary broadcast of the aircraft flight performance at the air show started slowly. It was just a prologue, which made a kind of aviation media reporters' eyes straight and suddenly realized.

"It's telex?"

"Oh, my God, the tm-9 is fly by wire?"

"Thailand has applied the technology of fighter planes to high-end business aircraft!"

"No wonder tm-9 aircraft adopts T-shaped vertical tail layout and dares to fly high angle of attack and climb vertically. They have already completed all flight envelope of the aircraft in the control system. As long as the pilot controls the control lever well, the rest is handed over to the computer. I will say that his royal highness the crown prince of Thailand's car can't be so simple. Such a set of fly by wire control is worth more than anything."

The media reporters and many aviation experts on the scene immediately talked about it one after another, and the newcomers and pure viewers around them naturally wanted to ask what happened.

If other airplanes can't attract such a big response, you should know that on the first day, the F-16 and F-18 of the United States were all fighter planes operated by telex, and there were live explanations and introductions during the flight performance, but they didn't attract such great attention.

However, as the last day of the flight show, the tm-9 aircraft has attracted a lot of people's discussion and interest. The reason is very simple. The plane that is spinning and rolling in the sky is the car of his Royal Highness the crown prince of Thailand. It has no royal aura and naturally gets unimaginable attention.In particular, some wealthy businessmen who think they are worth quite a lot of money ask very carefully, which means obviously that they want to start a plane if they can, and then go out to talk business with their partners, pointing to the plane and making a light introduction: "this plane is the same as the crown Prince of Thailand!"

The momentum and the face of the card will be different immediately.

"If I had known it was so popular, I would have brought Mr. Guo here for anything."

After hearing a lot of questions about the telex control system from the audience around, Lin Guanghua said something regretfully. Zhuang Jianye nodded slightly, then shook his head and laughed again: "however, I think Mr. Guo is not interested even if he knows about it. If our test object is successful or popular, Mr. Guo can at most smile and say that this road is right, and then continue to close it The ultimate goal of his family is to engage in fly by wire control of fighter planes in the research laboratory. "

When Lin Guanghua heard the speech, he was stunned for a moment and immediately nodded with a bitter smile.

What they said about Mr. Guo is nothing else. It is Mr. Guo Xiaobo, director of Flight Control Research Institute and chief engineer of telex control system of No. 10 project.

Over the years, Guo Xiaobo has led the project team to explore the architecture and algorithm of the fly by wire control system bit by bit from the UAV, and has made good progress, but also encountered considerable bottlenecks, especially in the case of tight funds, the transformation of the verification machine has become a headache for Guo Xiaobo.

So the aircraft platform based on experimental verification is put on the agenda.