In the sky, when Lu Lehui, a J-20 test pilot who had just completed a subsonic action test, was about to enter supersonic speed, Feng Huaixin's voice came from the radio: "03. This is the command vehicle, you first go back after afterburner supersonic speed, and then enter the transonic zone again, and maintain the airspeed at Mach 1.3 to 8 seconds, pay attention, there may be air stops." ”

"03 understood." In the absence of wires, Lu Lehui's voice is very normal, which test pilot has not encountered the danger of stopping in the air several times when he is flying in the sky, although it cannot be said that he is used to it, but it will no longer affect their flight control. What's more, this time Feng Huaixin had already warned in advance of the possibility of air parking, and after being prepared, Lu Lehui became even more focused.

"Smack!" A bang shrouded the middle of the J-20's huge body, and the milky white sonic boom cloud disappeared with the sonic boom, which was a very normal supersonic flight. Lu Lehui controlled the plane until it increased its speed to the limit of Mach 2.5 before exiting supersonic speed. Next, it's time to try the operation that Feng Huaixin said before that might cause air stopping.

The supersonic speed just now suddenly flew far away, and if he didn't fly back, the ground personnel would not be able to observe his flight attitude, so Lu Lehui turned the nose of the plane and began to refuel with all his might. The J-20, which is equipped with a new material engine, can reach a speed of Mach 1.3 at full throttle without using afterburner, because it is still at the critical point of transonic speed, so it cannot be regarded as supersonic cruise, even if the aircraft is already flying at supersonic speed at the moment.

"Airspeed Mach 1.3." As soon as the speed was reached, Lu Lehui began to report the flight status: "The engine output power is stable, the flight attitude of the aircraft is stable, and the normal shaking state has been maintained for 8 seconds, ready to turn on the afterburner." ”

On the ground, Feng Huaixin was a little nervous at first, but when the plane flew at Mach 1.3 for ten seconds in a row, he breathed a sigh of relief and said: "It seems that what you encountered should be an example, 20 did not happen." ”

As soon as the words were finished, the J-20, which turned on the afterburner and was about to rush with all its might, seemed to have crashed into the water, the fuselage shook, and then the speed suddenly decreased, and then Lu Lehui's voice came from the radio: "The two engines are all stopped, and I am trying to restart." ”

What happened to Xia Yu again in the morning, there was a lot of tension in the tower and the ground command vehicle, but fortunately, like the J-31, the J-20 successfully restarted at a distance of 6,500 meters from the ground, and then landed safely on the ground.

As soon as he got out of the cockpit, Feng Huaixin greeted him and asked, "How is it, are you okay?" ”

"It's fine." Lu Lehui shook his head, raised his two arms and said, "The moment the engine stops, the arm hits the hatch, there should be some bruises." ”

"It's fine, but I'll get it checked later." Feng Huaixin was not careless, and then asked, "What did you do before the engine stopped?" ”

"The speed of Mach 1.3 is a direct full throttle operation, and when I was about to break through the transonic zone, I just opened the afterburner chamber, and the plane shook twice and stopped directly."

"Sounds like a recoil surge?" Feng Huaixin had a question on his face, and said to himself: "But the plane stopped directly after shaking the engine twice, this process is too short and too fast, is it the problem of the compressor?" It shouldn't have been turned off so soon, it's going to have to be studied. ”

Not to mention that the test flight crew of the J-20 was squatting together with a headache, Xia Yu saw that soon after the J-20 landed safely, he said hello to Feng Huaixin and Lu Lehui and left. The problem of parking in the air encountered by Lu Lehui is almost the same as his own, so it is estimated that it should be the problem of the core machine. Because the inspection of the plane after landing, it also did not find any abnormal situation, so that before the reason for the air stop is completely figured out, whether it is 31 or 20, it will not try to lift off again, so tonight Xia Yu plans to carry out the same simulation in the consciousness space, and strive to find the problem as soon as possible, I believe that with the help of the starry sky, it should be solved.

At night, just after entering the consciousness space, the starry sky brand metal dictionary floated in front of Xia Yu as always, and he couldn't tell the difference between the male and female voices as usual flat: "Xia Yu, just three minutes ago, the positioning signal emitted by the distress locator of the Ledidas disappeared. ”

The Ladidas? Xia Yu was stunned for a moment, not remembering what it was. After a while, it turned out that the starry sky was talking about the distress locator transmitter of the wreckage of the alien research ship.

As soon as he thought of this, Xia Yu was a little happy, he was just to let this positioning signal transmitter be obtained by his own people, and after looking for an excuse for a long time, he found that it was most suitable to carry the black pot to the Americans, but he didn't expect to catch a big fish, and the black pot became a frying pan. The discovery of the Ohio-class nuclear submarine and its forced float away is really an unintentional anecdote. And in the end, as expected, the signal from the positioning signal transmitter was intercepted and found by his own ship, and then it was transported back inland.

Xia Yu actually didn't know that one of the emergency missions of the 631 platform was to find the positioning signal transmitter, and it was not only the United States that intercepted the information sent by the meteorite, in fact, most of the astronomical observatories around the Asia-Pacific region received this signal, but by coincidence some observatories noticed this detail, and some ignored it.

Our own observatory did not ignore this signal, but the search force that can be provided is not sufficient, and the depth is not something that ships and salvage boats can go down, so we can only ask the ** deep diving aircraft to search slowly one area after another. If it weren't for the fact that the location of the positioning signal transmitter had just been determined when the American submarine was forced to float, I am afraid that I would not know when to find it, so Xia Yu's black cauldron is a veritable killing two birds with one stone.

Coming back to his senses, Xia Yu asked, "The signal disappeared, where did it disappear?" ”

Suddenly, a map of China appeared in front of Xia Yu, and a small red dot kept flashing on the map. "The red flash is the last position before the signal disappears," Starry Sky said. ”

With the explanation of the starry sky, the map was also zoomed in, and Xia Yu saw that it was an aviation base inland. Xia Yu felt that it was unlikely that the instrument would be destroyed, and it was probably placed in a place where the signal could be isolated. Despite thinking so, Xia Yu still asked, "Is there a possibility of being destroyed?" ”

"Based on simulations of human behavior, the likelihood of forced destruction is very low." Starry Sky replied, "There is the highest probability of normal disassembly and signal isolation. ”

Is that really the case? Xia Yu said secretly, and then his mind changed, this seems to be his business for the time being, he is not able to and cannot participate in that research now, just think about it, you can know that if the product of alien technology and civilization is obtained by the state, the level of secrecy is probably not below any archival text.