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Chapter 537 A Different Plane

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    It¡¯s no wonder this reporter expressed this. The T-shaped vertical tail, also known as the high-level vertical tail, has many benefits. For example, it can increase the control arm of the pitch angle, thereby making the aircraft¡¯s vertical tail  Made smaller and lighter, it improves the maneuverability of the aircraft while reducing the overall structural weight.

    Another example is that the T-shaped vertical tail is less disturbed by the engine and wing disturbances and has less cruise resistance. Therefore, it can help the aircraft gain greater speed in level flight, especially for passenger aircraft or business jets operating at subsonic speeds, with the same power.  In this case, the cruising speed of an aircraft using a T-type vertical tail is higher than that of an aircraft with a traditional vertical tail layout.

    However, the T-shaped vertical tail has many advantages, but it is not omnipotent, because its shortcomings are also very obvious, that is, it is easy to cause a stall at a high angle of attack, and it is difficult to recover, causing a serious air crash.

    This is mainly because when the angle of attack of an aircraft with a T-type vertical tail reaches a certain level, the angle of attack of the aircraft will automatically increase due to the additive factor of torque, and there will be no obvious stalling characteristics such as jitter and tremor during this process.  When they discovered it, when they wanted to recover, they found that the entire aircraft was out of control and could only jump to the ground with a scream.

    This is also an important reason why the Soviet Tu-154 passenger aircraft is no worse than similar Western aircraft in terms of level flight speed, range and even passenger capacity, but it cannot be compared with Western aircraft in terms of safety.

    Because of the T-shaped vertical tail and the rear-mounted engine, the center of gravity of the aircraft moves further back, resulting in an increase in torque. Once the pilot makes a mistake and the angle of attack of the Figure 154 passenger plane exceeds the critical range, the entire aircraft will stall. In addition to the aircraft crash and loss of life,  There is no other choice.

    There are also md-82 series aircraft of the same type, but McDonnell Douglas's good public relations, coupled with the meticulous production of the flight manual, stipulates that the maximum angle of attack of the md-82 series aircraft cannot exceed a certain value, and it is strictly controlled by computers.  This prevents the md-82 series aircraft from becoming a flying coffin like the Tu-154 passenger plane, but compared with aircraft of the same type, the accident rate is still much higher.

    Because of this, whether it is a large passenger aircraft or a small aircraft, an aircraft with a T-shaped vertical tail layout is like a lady during the takeoff and climb phase. It is impossible to hit a high angle of attack as soon as it comes up and rush upward regardless of it, but will slowly climb up.  , fly slowly, and then demonstrate the speed and maneuverability in level flight. The reason for this is that I am afraid that if I don¡¯t pull up properly, the aircraft will fall into a stall.

    But the TM-9 aircraft that just took off broke this convention. Although the dry land pulling on it is not as abnormal as the 65 degrees or 70 degrees of those European and American fighter jets, it is still close to 50 degrees. Although the engine is located at the front end  , compared with the rear-mounted engine, the center of gravity configuration of the entire aircraft is more reasonable, but the rule that the T-shaped vertical tail layout is prone to stalling at high angles of attack will not change.

    unless¡­¡­

    Several experienced reporters looked at each other, and one of them said in surprise: "Can their pilot control the plane so accurately?"

    As soon as these words came out, without waiting for the other people to answer, the reporter who asked the question shook his head vigorously: "Impossible, the stall of an aircraft with a T-shaped vertical tail layout at a high angle of attack is 1 to  At the level of 3 degrees, it is impossible for even a delicate person to control the operation so finely."

    Several other people nodded in agreement after hearing this. They are all senior media people in the aviation field. They know very well how difficult it is to control the angle of attack of 1 to 3 degrees. Maybe the pilot's hands shake a little, and this angle will be used by the pilot.  Unconsciously passed to the plane, and then

    "What just took off is the TM-9 aircraft developed and produced by the Royal Thai Aerospace Industries Corporation. It is also the first aircraft in Southeast Asia to adopt a fly-by-wire control system"

    Just when many reporters were puzzled by the TM-9 aircraft's action of using a T-shaped vertical tail layout but daring to fly on dry land at a high angle of attack, the explanation broadcast of the aircraft's flight display at the air show slowly sounded, just a  The opening remarks made aviation media reporters¡¯ eyes widen in surprise, and they suddenly realized.

    ¡°So it¡¯s telex control?¡±

    "Oh my god, the TM-9 aircraft actually uses fly-by-wire control?"

    ¡°Thailand actually used the technology from fighter jets to high-end business jets!¡±

    "No wonder the TM-9 aircraft adopts a T-shaped vertical tail layout and dares to climb vertically at high angles of attack. They have already prepared all the flight envelope of the aircraft in the control system. The pilot only needs to control the joystick and everything else will be done.  Leave it to the computer, and I will say that the car of His Royal Highness the Crown Prince of Thailand cannot be that simple, and such a set of fly-by-wire controls is worth more than anything else."

    Media reporters and many aviation experts at the scene immediately started talking. The rookies and pure spectators surrounding them naturally wanted to ask about telex control.

    If other planes can't afford such a big response at all, we must know that the F -16.The F-18 is a fly-by-wire fighter aircraft, and there are on-site explanations and introductions during flight performances, but they have not attracted such great attention.

    However, the TM-9 aircraft that appeared on the last day of the flight show caused many people to talk about it and became very interested. The reason is very simple. The rotating and rolling aircraft in the sky is the car of His Royal Highness the Crown Prince of Thailand, and it carries with it the supreme royal power.  Halo, naturally gained unimaginable attention.

    In particular, some wealthy businessmen who thought they were worth a lot asked questions very carefully. The meaning was obvious. If possible, they would also like to buy one. When they go out to discuss business in the future, they pointed to the plane and introduced it to their partners: "  This plane is the same model as that of the Crown Prince of Thailand!¡±

    That momentum and the face of the card immediately changed.

    "If I had known I was so popular, I would have dragged Mr. Guo over no matter what."

    Hearing many spectators asking about the telex control system, Lin Guanghua said regretfully. Zhuang Jianye nodded slightly, then shook his head and smiled: "However, I guess Mr. Guo wouldn't be interested even if he knew about it.  , if our experimental product is successful or popular, the most Mr. Guo can do is smile and say that this is the right path, and then continue to stay in the research room to control the fighter by wire. That is his ultimate goal. "

    When Lin Guanghua heard this, he was startled for a moment, then nodded with a wry smile.

    The Mr. Guo they were talking about was none other than Guo Xiaobo, the director of the Flight Control Research Institute and the chief engineer of the fly-by-wire control system sub-project of Project 10.

    Over the years, Guo Xiaobo has led the project team to explore the structure and algorithm of the fly-by-wire control system bit by bit, starting from drones. It has made good progress, but it has also encountered considerable bottlenecks, especially when funds are tight. The verification of transformation  The machine has become a very troublesome problem for Guo Xiaobo.

    So an aircraft platform based on experimental verification was put on the agenda.

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