Cao Huajun was dripping cold sweat on the back of his head, he had heard about Xia Yu's bad deeds from others, especially during the period when Xia Yu was a J-31 test pilot, Wang Yifu, who was in charge of Xia Yu's test flight group, every time he talked about Xia Yu, his expression of love and hate was particularly impressive.

As long as Xia Yu takes off, Wang Yifu's heart will unconsciously sway between heaven and hell, Wang Yifu estimated that he didn't expect that the result of his complaining to others was not Xia Yu's superb flying skills, but Xia Yu's reckless and undisciplined crazy behavior. If it weren't for the fact that the R&D progress of the 31009 was significantly higher than that of other test flight groups, the final finalization and mass production was also based on the 31009, which made Xia Yu's many contributions to the J-31 be disclosed, and also made others understand that what Xia Yu did was not just the work of a test pilot, but really participated in the design and improvement of the aircraft.

Without a certain amount of knowledge, it is impossible to develop an aircraft, especially a very rigorous fighter jet. Xia Yuneng later participated in the development of the Shenlong as Yuan Limin's scientific research assistant, and his active performance in the J-31 test flight work was indispensable. Therefore, after Xia Yu saw the 1801 technical verification machine, he was able to infer so many things just from his appearance, which was undoubtedly a normal situation in Cao Huajun's opinion, but just let Xia Yu get on the plane directly and try it, Cao Huajun looked around and said: "The weather forecast says that there will be a strong wind soon." ”

Cut! Stingy. Xia Yu complained in his heart that Cao Huajun meant that the wind would blow away the haze and make the sky clear. As a result, SCP-1801 had to be pulled back into the hangar and parked to avoid being photographed by satellites in low Earth orbit. That is, if you want to fly 1801 now. No way.

Xia Yu, who was full of slander, didn't want to think about it, he was not a member of the test flight team, and it stands to reason that such a confidential project, let alone personal contact, even if he watched it, he would not show it. Cao Huajun didn't drive him away at the beginning, which was already very face-saving. But in fact, Xia Yu himself knew that in fact, when he borrowed a car from the airport ground staff and said that he was going to come over to see the plane, Cao Huajun must have received the news that he was coming, otherwise he would not have been at the airport at all. In other words, Xia Yu was able to see this aircraft with his own eyes, and it was permitted, which is somewhat meaningful.

Because Xia Yu is not a relevant person of the 180 project, nor is he the kind of leader who has enough authority to know about this kind of secret project, the other party must have a requirement to let himself know about this aircraft, which Xia Yu has already figured out when he borrowed the car, so he will have the idea of directly going to test fly 1801.

The reason why Cao Huajun was stingy was just because Xia Yu's desperate desire to be able to fly was extinguished. The test flight of the 1801 technical verification aircraft is inevitable, the question is only when it can fly, Xia Yu understands this in his heart. Sure enough, in the conversation that followed. Cao Huajun showed Xia Yu that one of the reasons why Xia Yu was arranged to stay at this small remote airport was that he hoped that 1801 could get different evaluations from different pilots. During your stay at the airport. Xia Yu can participate in the whole process of 1801 work and can test fly. You can also put forward suggestions for improvement, but Xia Yu will not participate as a member of the test flight team. It's kind of a temporary research consultant.

Xia Yu has no opinion on this identity, X20's final test flight has entered the final stage, as long as the task here is completed, Xia Yu will still go back to continue the test flight of X20 as soon as possible, after all, that is his own hard work.

A few days later, Xia Yu's mission report on the moon surface was approved, and the above was very satisfied with Xia Yu's work on the moon, so Xia Yu was given a collective first-class merit and individual second-class merit, Xia Yu didn't care about this, because after a few days of ground simulated flight, Xia Yu could finally really test fly the 1801 vertical take-off and landing aircraft.

Thanks for the haze days. Looking at the sky that had become gray again, and even the sun was almost blocked, Xia Yu changed his complaint about the haze, if it weren't for such a thick haze, Xia Yu might have to wait for a long time if he wanted to take off.

"Adjust the size of the throttle output again." Cao Huajun stood next to the command vehicle, looked at the data displayed by the computer on the workbench, and gave instructions to the technicians who stood under the wings to mechanically fine-tune the output of the oil pipes, while Xia Yu cooperated with Cao Huajun to push the throttle valve of the aircraft, providing data to the computer on the workbench to provide data support for the adjustment of the technicians.

This kind of adjustment is familiar to Xia Yu, and soon, Xia Yu completed all the steps of the ground inspection. Clearing all the data cables connected to the aircraft terminals, the technician closed the maintenance hatch under the wing and left the plane, and then guided Xia Yu off the tarmac and taxied to the runway more than 100 meters away.

"The radar check is complete and it is in good condition. The weapon system has been inspected and there is no ammunition. The friend or foe identifier has been checked and is working normally. The digital instrument is normal, the helmet display is normal, the avionics system is normal, the warning panel is normal, the ejection system is normal, the flight control system is normal......" Xia Yu did the final check before takeoff.

The flight cockpit of the 1801 is very close to that of the J-20B, with a blister-shaped cockpit design, a huge touch-sensitive display screen inside, and extremely convenient side joysticks. Because it is also equipped with a distributed photoelectric synthetic aperture system, the head-up display is canceled, and the helmet display is used like the J-20, semi-digital array radar, which is basically the same as the J-20B in this regard, not as good as X20, Xia Yu complained a little, and after completing the take-off inspection project, Xia Yu said on the radio: "1801 inspection is complete, please take off." ”

"Command vehicle received, 1801, you can take off at any time." Cao Huajun's voice sounded on the radio, and Xia Yu smiled when he heard this, and his heart became a little excited. At the same time, Xia Yu also selected the vertical take-off mode on the screen, and after pressing confirm, the movable hatch under the tail of the 1801 fuselage was opened to both sides, and the originally straight engine three-bearing rolling tail nozzle rotated to the ground, which is based on the improvement of the Yak 141 tail jet design, which is very similar to the F35.

At the same time as the tail vents are offset downward, the lift fan caps and belly behind the cockpit and the lift vents under the wings on both sides are also clocked in at the same time, just like the Transformers, all of which are done very quickly and smoothly. Seeing that the multi-function display indicated that the VTOL mode had been prepared, Xia Yu couldn't help but be a little excited, and said: "The VTOL mode is ready, and I have taken off." ”

After speaking, Xia Yu pushed the throttle valve, plus the output power of the engine, the WS15 engine that was basically the same as the X20 began to roar quickly and wildly, when the thrust reached the 165 kN required for hovering, Xia Yu only felt that the fuselage was slightly light, as if the grass was blown by the breeze, and it was fluttering as if there was no weight swaying slightly from side to side.

Xia Yu did not continue to increase the output power of the engine, the way of vertical take-off and landing is completely different from the feeling of taxiing and take-off, even if he trusts his reaction ability, Xia Yu does not plan to take off directly when the vertical take-off and landing is implemented for the first time, so when the aircraft reaches the hovering thrust, Xia Yu immediately began to quickly review the multi-function display, and at the same time reported the flight data to Cao Huajun: "The engine compressor is working well, Roll control nozzle thrust 18.2 kN, lift fan working fine, air flow 220 kg per second, vertical thrust 82 kN, three-bearing roll nozzle vertical state, thrust 65 kN, currently in good condition, I want to try roll control. ”

"Command vehicle received." Cao Huajun looked at 1801, who was shaking slightly on the ground more than a hundred meters away, and said, "Pay attention to the roll angle and yaw moment. ”

"1801 Received." After Xia Yu finished speaking, he began to perform some tentative micro-manipulation on the roll control nozzle on the control lever, and then Xia Yu immediately felt that the shaking amplitude of the 1801 began to increase, and shook back and forth for a while, after Xia Yu adapted to this degree of operation, he began to increase the output power of the engine, and the 1801, which had long been ready to go, immediately gave back to Xia Yu's operation, and in the deafening roar of the aero engine, 1801 slowly rose vertically, until it rose to a height of about thirty meters, Xia Yu began to hover at this time.

"Thirty altitude, zero airspeed, good attitude at the moment, ready to enter normal level flight." Xia Yu reported the flight data. To tell the truth, it is clear that it has already flew, people are in mid-air, but there is no speed, the surrounding environment is basically in a static state, this feeling makes Xia Yu feel very peculiar, but the next thing is to try to take off and land vertically into a level flight state, the conversion between this mode is very critical, if there is a problem with the flight control design, the plane without airspeed will be carried headlong, Xia Yu is ready to parachute.

"Toggle airplane mode." Xia Yu set it on the touch screen, and then said, "Prepare to accelerate level flight." ”

"Command vehicle received, 1801, you can start at any time."

"1801 Received." After Xia Yu finished speaking, the right hand that was naturally next to the driver's seat gently pushed the joystick forward, and the lift fan that was originally vertically downward began to deflect backwards by 30 degrees, providing forward thrust for 1801. As the aircraft gets faster and faster, the wings gain enough lift, and the engine's tail jets become straight, providing thrust directly to the plane. At the same time, the top cover and roll control nozzle of the lift fan began to slowly close, and in a short time, the VTOL fighter became a single-engine aircraft with a conventional layout, and began to fly in the air in the most normal way of flying. (To be continued......)

PS: Thank you Lu Can 112 for the monthly pass.