This is the first time that airborne interception radar has never been developed in China, although it has been detected on the ground, but after installation, I don't know how many technical problems are in front of the roadblock.

The radar can't intercept the target, it's much more difficult to deal with than the ground clutter, Qin Feng can't help this time, he can only watch Team Leader Zhu and others busy dismantling various equipment inspections, and this time the delay will be even more.

The test flight mission of the J-8 was very tense and he couldn't always wait for the radar, so when part of the radar circuit was removed for detection, Qin Feng took off the J-8 again.

Pull the rod, retract the landing gear, and the beautiful man took off into the air and began to climb.

"006 report, altitude fifteen thousand, speed six hundred, normal gauges, preparation for supersonic tests."

"001 received, attention, turned on afterburner, accelerated to Mach 1.3."

"006 Roger." Qin Feng shouted on the radio, looked at the row of switches on his left side with the corner of his eye, and skillfully toggled.

Suddenly, a strong force came from the back, and in the afterburner of the two turbojet-7 engines in the tail, more aviation fuel was sprayed in, burning violently, turning into high-temperature and high-pressure gas, spraying backwards, the power increased instantly, and the feeling of pushing back was much stronger than on the ground.

This is, after all, a twin-engine fighter.

Afterburner is a means unique to fighter jets, ordinary engines, compressor compression air in front, ignition in the combustion chamber behind, forming a high-temperature and high-pressure gas to push the turbine blades, and then it is sprayed out, which is normal operation.

The afterburner is to add a combustion chamber behind the engine, after the air flow comes, there is still a part of oxygen in it, which can support combustion, so continue to inject fuel and burn, so that the power can be improved.

Of course, at this time, the fuel consumption rate of the engine will increase several times, which is almost equivalent to giving the engine a drug and cannot be used for a long time.

With this powerful push back feeling, the J-8 fighter at an altitude of 15,000 meters also began to accelerate, the airspeed meter continued to turn to the right, and the fighter gradually approached the speed of sound.

Once upon a time, the speed of sound was a wall in front of the aircraft, and any plane that approached the speed of sound would crash into this wall and be smashed to pieces.

Jaeger, the test flight hero that Qin Feng admires very much, is the first test pilot to fly past the speed of sound.

Now, as the laws of supersonic flight are constantly mastered, fighters have long been able to enter supersonic flight, and it is no longer a sound barrier that stands in front of the aircraft's speed, but a thermal barrier.

In front of the nose of the plane, a white mist suddenly appeared, Qin Feng's eyes lit up, almost all of this scene appeared below 10,000 meters, this time he was able to see the sonic boom cloud at 15,000 meters, it was really spectacular.

I saw that the white fog in front of the nose quickly gathered, forming a cone-shaped, like a horizontal umbrella, and then, the nose suddenly passed through the top of the umbrella, passed through this layer of white fog, and pierced the sonic boom cloud!

The voice had already been left behind by Qin Feng, and he was already faster than the speed of the voice!

The glass on the helmet has been put down, at this height, oxygen must be inhaled, this full helmet is covered on the head, it is very cumbersome, Qin Feng constantly swept the airspeed with the corner of his eye, and shouted in his mouth: "Mach 1.1." ”

"Mach 1.2."

The hands of the Mach watch were still turning, and suddenly, Qin Feng felt a tremor from the rudder on his feet, and this tremor was transmitted to his two legs, and with it, the entire fuselage shook.

"006 report, fuselage vibration, unknown cause." Qin Feng shouted over the radio.

The vibration of the fuselage is the most terrible, because it means that the aerodynamic layout of the aircraft is problematic, and if you continue to fly, the aircraft will disintegrate in the air at any time.

In particular, the ejection device is extremely unreliable, and if the plane disintegrates, it may be sacrificed itself.

Afraid?

I'm afraid I won't be a test pilot! Since you have chosen this path, then go forward!

It's just that at this trembling moment, Qin Feng's mother appeared again in front of his eyes, and if he sacrificed, his mother would definitely be sad.

"006, slow down, re-accelerate in." Commands from the ground tower came from the headset.

"006 Roger." Qin Feng shouted on the radio, turning off the afterburner.

At this time, the fighter plane had already soared to Mach 1.26, Qin Feng looked very carefully this time, and when the pointer fell back to Mach 1.24, the vibration disappeared again.

It seems that this vibration only appeared at Mach 1.24, but what is the reason for it?

Qin Feng felt that the speed of the fighter continued to decrease, and when it dropped to Mach 1.1, he turned on the afterburner again.

The two engines in the tail spewed flames again, and the blazing tail flames pushed the fighters, accelerating, accelerating!

Qin Feng looked at the meter seriously, when the pointer exceeded Mach 1.2, he felt his heartbeat speed up a little, and when the pointer pointed at Mach 1.24, sure enough, the vibration just now came again!

This vibration is not very strong, but it can be felt completely, Qin Feng reported on the radio: "Speed 1.24 Mach, vibration appears again!" ”

"006, test flight over, return."

I have already experienced it twice, and how to analyze it next is a matter for ground technicians, after all, this is a test aircraft, and all kinds of data have been recorded.

However, Qin Feng was still unwilling, his test flight was completed, and the fault was found again, but how did this failure appear? When you go back, the people on the ground may not be able to find out.

He remembered the first time he had contact with Wang Yang and others, and when they communicated with each other, everyone mentioned a special vibration of the J-8 at subsonic speed, which lasted for several years, and finally Mr. Gu took the training plane to the sky to observe the fluffy J-8 up close, and then found the problem.

Now there is a vibration in supersonic speed, and if the cause of the vibration is not found, maybe there will be a serious delay in the progress.

Remembering that when the vibration appeared, the rudder was the first to feel it, Qin Feng couldn't help but turn on the radio again: "006 report, the fault may appear on the rudder, request for another test flight judgment." ”

This time, he waited on the ground for a few minutes, obviously deliberating, and when Qin Feng had already turned the nose of the plane and returned to the airport, an order finally came: "Yes, another test flight." ”

"006 Roger." Qin Feng got this order, his mind had cleared up, he gently opened the partition above his head, and from there, he folded down a device of five big and three thick, which was placed right in front of him.