On the other hand, it is the operating system, the previous second-generation aircraft, all of which are hydraulically operated, and even the third-generation aircraft of the Soviet Union, the MiG-29, is also hydraulically operated, and the Su-27 is a telex, but it is a three-degree analog telex.

And now, the advanced control is already digital telex, and only digital telex can be used to use the flight control computer to pass the guò flight control program and deal with various situations in an emergency, which is a new field.

The No. 10 project developed by Cheng Fei adopts a duck layout, which has a congenital instability, and the guide must use digital telex to be able to control the aircraft stably, so Cheng Fei needs to overcome the difficulties of digital telex, and they have established a test bench called Iron Bird to study the digital telex system.

In history, the flying leopard first used the three-degree analog telex, and when the flying leopard A was replaced with a three-axis four-redundancy digital telex, and now, seeing the flight control of advanced military aircraft, Xifei also decided to use the three-axis four-redundant digital telex to jointly develop with Chengfei, and after the development is completed, the two sides share these technologies.

Now the airframe test flight is carried out using hydraulic operation, and after the airframe test flight is completed, the fly-by-wire system has also been developed, and the digital fly-by-wire system is being replaced.

Mhammad couldn't help frowning, as if he had taken a detour.

Hydraulic operation, and digital fly-by-wire is very different, now the test flight first, then after the fly-by-wire system is equipped, maybe many subjects have to be tested again, which will cause waste.

"We are now conducting test flights, and we can master first-hand flight data, and when the time comes, we will write fly-by-wire flight control software, which will be based on the data obtained from these flights, which can be more accurate and effective."

Listening to Chen Yijian's words, Muhammad nodded: "Hmm." It's also a good idea. ”

After all, they built this plane, and from the beginning of the design, they have been constantly exploring and mastering all the performance, and then through guò test flight, they have completely mastered the number of flights. It will definitely be easier to program the digital telex, and at the same time reduce the risk of the test flight of the digital telex.

After all, digital fly-by-wire is dangerous, and many countries have crashed because of the problem of digital fly-by-wire during test flights, even the most advanced F-22 in the United States.

"The test flight of any fighter plane is full of hardships, Mr. Chen. The first test flight of this fighter plane, did there be a big twist and turn? Mhammad asked.

He had already remembered that in later documents, it was recorded that this fighter had flown off the rudder, but there were two theories, one was that it flew off the first test flight, and the other was a few years later. I flew off when I was flying in any subject.

Mhammad is also not a scientist and cannot find which statement is correct. Right now. Seeing that this fighter has begun to fly test, I can't help but ask.

"Yes, there was a difference of 60 kilometers between the front and rear speedometers, but the front and rear speedometers were different, and there was also a fire signal flashing, which was later found to be a false signal." Chen Yijian said: "At that time, it was Captain Huang who tested the flight. Everyone is sweating. ”

"Is the rudder alright?" Mhammad asked.

Rudder? Chen Yijian said: "It's okay, the rudder has been intact, if the rudder is stuck, there is no second choice except parachuting." ”

The Flying Leopard is a single-tailed fighter. There is only one rudder, and if the rudder fails, the plane cannot steer. Of course, there are exceptions to everything, the Israeli Air Force had a collision during flight training, and half of the wings of a fighter plane fell off, and as a result, the pilot was still flying the plane without wings, and the flute flew back.

5,000 meters in the air.

"Check the condition of each table and prepare for a large-speed test flight." The voice of the ground commander was heard in the headphones.

The Flying Leopard fighter is a supersonic fighter, and in modern times, low-altitude and large-speed penetration is already an effective means of penetration, and the Flying Leopard must have this ability.

And at the time of the test flight, the subsonic flight will be carried out first, and then the transition to supersonic speed will be gradual, and the test flight of the previous stage is over, and now, the supersonic test flight will begin.

"Understood." Huang Bingxin's eyes swept over the various instruments, all the instruments were normal, so he opened the afterburner to the positive airspace.

The two Spey engines burst out with maximum thrust, the flames in the tail became hot, the fighters began to accelerate continuously, and the pointer of the speedometer in front of them turned to the right.

When the sound barrier is broken, you can feel that the whole body seems to tremble, and then continue to accelerate!

What's going on? It seems that the fighter plane is a little trembling? Huang Bingxin felt that the muscles on his face were shaking, could it be that he had encountered a special air current?

"Old Yang, what's going on?" Huang Bingxin asked the navigator behind him.

"I don't know, our fighter planes are trembling terribly." Yang Buxin in the rear cabin said.

It's the fighter plane trembling! When the speed of sound is exceeded, the fighter begins to tremble! This shows that the body has a strict design problem, and supersonic speed induces tremors!

All the instruments in front of Huang Bingxin were trembling, and all the indicators were not clear, and he stretched out his hand, wanting to turn off the afterburner and slow down the fighter.

At this moment, a bang came from the tail.

"Old Yang, what's going on?" Huang Bingxin asked, "Can you see smoke coming from the tail?" ”

Huang Bingxin's biggest concern is the engine fire.

"No, the tail is normal." Yang Buxin said that because the back blocked the view, he tried to turn his body as much as possible, and he couldn't see the rudder at the rear, he could only see that there was no black smoke behind him.

At this time, Huang Bingxin's hand had reached the front panel, turned off the afterburner, and then kicked the rudder on the right, oops, no response!

The lever still has the familiar feedback force, pulling back, the fighter followed with the head up, pushed forward, bowed, gently pressed the lever, the fighter began to turn sideways, however, the rudder did not respond!

It must be a failure of the rudder in the back! Huang Bingxin frowned, and then said: "Lao Yang, the rudder is faulty, I am piloting the plane, I must drive it back, if there is an accident, you will parachute and report the news to Mr. Chen." ”

The huge vertical tail is still connected to the VHF communication antenna, and at this time, the sizzle of the radio in the headset is gone, indicating that even the antenna is also malfunctioning.

"I'll fly back with you!" Yang Buxin in the rear cabin also looked firm.

When the speed of the fighter plane slowed down, it finally stopped trembling, but after losing the rudder, the route back became extremely difficult.

The rudder, which is a rudder blade on the vertical tail, turns to the right, blows the airflow to the right, and is subjected to reaction force, the tail will be to the left, and the aircraft will turn around, when a large angle is needed, the aircraft also needs to turn sideways, relying on the combined force of lift and gravity to provide centripetal force.

And now, without the rudder, the steering can only be carried out by relying on the two engines in the tail, changing the thrust of the two engines, one large and the other small, you can make the nose deviate at a small angle.

Aim at the runway, you only have one chance!

Huang Bingxin felt that there was constant sweat flowing down his back, it didn't matter if he sacrificed, when he became a test pilot, he had this awareness, but he needed to drive the plane back, let the scientific researchers study, see where the fault appeared, why this failure occurred, and find a solution!

"001, please answer if you receive it." The commander in charge of the command on the tower kept shouting, but he didn't hear an answer, and he couldn't help but be a little worried.

"It's back, it's back!" At this moment, a member of the tower saw the fighter plane in the distance.

Wandering, just like being drunk, looking at this fighter, Chen Yijian was suddenly shocked, what's going on?

"Chairman, President, please get out of here immediately, our plane, I'm afraid it's out of order." Chen Yijian said.

The test flight of this fighter was full of twists and turns, almost every twenty minutes, there would be a failure, and now a lot of it has been eliminated, and now it is flying swayingly, maybe there will be another big failure!

Mhammad held the telescope in his hand and looked at the flying leopard in the sky, and sure enough, behind the hanging tail, there was no rudder!

"The rudder is off." Mhammad said: "Deng Gong, it is more important to protect people than to protect planes, let them parachute!" ”

The life of a test pilot is the most precious, and everyone has a family and children, and in Mhammad's point of view, he never wants to hear that a certain pilot lost the opportunity to parachute and died honorably in order to rescue the malfunctioning plane and protect the country's property. If the plane is gone, it can be rebuilt, and if the people are gone, then it will be completely gone.

"Yes." After Chen Yijian heard Deng Gong's order, he immediately replied and asked people to go to the tower to convey the order, and at this time, the plane had already reached the opposite side of the runway, aimed at the runway, and fell.

It is a fearless spirit to sacrifice oneself to keep the plane, and although Mhammad does not approve of it, he still admires it very much.

When the rear wheels of the fighter plane hit the ground, there was no chance to change its course, and Mhammad showed an appreciative expression as he watched the fighter plane accurately align with the runway.

The front wheels touched the ground, the parachute was lowered, and the fighter plane was still sliding forward, almost to the end of the runway, before stopping.

The fire truck on standby next to it had already started at this time, and the ground crew carried the ladder and followed it.

"Mr. Chen, I'll drive the fighter back for you." Opening the hatch, Huang Bingxin came down the ladder, his face was pale and full of sweat, he was still very calm: "After our fighter speed, it began to induce vibration, and as the speed increases, the vibration will become bigger and bigger." ”

As a test pilot, he faithfully fulfilled his duty.

Mhammad on the side was also moved, an advanced air force is not bought, it must have its own research capabilities, and it requires the dedication of countless personnel, even risking their lives. (To be continued......)