Yang Fenghata and others are not the only ones who are paying attention to this test flight.

In another assembly workshop of Plant 112, Artem Trusov and Alexander Mosin, technicians from the Sukhoi Design Bureau, are assisting their Chinese counterparts in the final pre-factory verification of the J-8II ACT stabilization verification machine.

While resting near the entrance of the factory, they naturally witnessed the whole process of this gliding test.

The test flight of the plane itself is actually nothing worth keeping secret.

The main thing is that it is such a big plane, and the movement of the turbojet engine is so big, it is really impossible to hide anything.

Not to mention the people working in the 112 factory, even the ordinary people living around can see it casually.

The real secret is the detailed data obtained from the test flight.

In fact, the fact that these two Sukhoi engineers were able to rest at this time, and that they could rest for a few hours, was specially arranged by Yang Fenghat.

There are not only morning sessions, but also afternoon sessions.

All they want is to let them see the first flight of the prototype No. 04!

……

At noon that day, the Tu-154M landed at Taoxian International Airport, and Chang Haonan got into the familiar 212 jeep again.

Only this time, the car did not go to 601, but sent him directly to Beiling Airport.

Then Chang Haonan, who hadn't come back to his senses, saw the No. 04 prototype in the distance that was ready to go on the tarmac, and he was so shocked that he almost exploded.

"I c...... God, you've changed it out? ”

It is important to know that the production of prototypes is not the same as entering the mass production stage, because the production has not yet been finalized, so the efficiency is generally much lower.

It can be seen that the 601 Institute and the 112 factory are definitely desperate for this matter.

"During this time, the lights of the various departments in the institute have not been turned off."

Yao Mengna, who was wearing a blue overalls, stood at the door of the jeep and said that her long hair was hidden in her hat because she was in the workshop.

"Come with me, the first flight ceremony is waiting for you." Yang Fengwan directly opened the co-pilot's door and sat down: "This is your wing, you should witness its first take-off with your own eyes." ”

As for the careless off-the-ground in the morning, the latter, of course, was not prepared to say it.

Chang Haonan's original intention of coming back ahead of schedule was to verify whether there was a problem with the design of the turbojet 14, but he was still unwilling to miss the first flight of the new J-8-3.

Yao Mengna also sat in the back seat on the other side, and the jeep sped away in the direction of the tower.

When passing near the No. 04 prototype, Chang Haonan motioned for the driver to slow down, and poked his head out to pay attention to its wings.

He's going to keep this shape in his mind—

This is the first project he has really presided over since his rebirth.

Whether it was J-7F or Xinzhou-60 before, although he played an important, even core, role, he still can't be called "host design".

But this new wing can.

Twenty minutes later, everything was ready, and the first flight in the true sense of the word was about to begin.

The test pilot, of course, is still Fu Guoxiang.

Under his control, the plane glided to its position at the end of the runway.

With this morning's experience, he has basically figured out the taxiing and take-off performance of this aircraft.

Therefore, after receiving the take-off order, Fu Guoxiang did not choose a conservative long-distance taxi like the usual first flight of the model, but directly pushed the throttle valve to maintain the engine speed at a higher level than in the morning.

The tail nozzles of the two turbojet 14 engines gradually appeared orange-red hot gas, and the air behind the aircraft was also optically distorted due to the sudden increase in temperature.

After making sure that the speed was stable, Fu Guoxiang released the brakes, and the plane instantly appeared a slightly lowered nose attitude, and at the same time began to accelerate and taxi on the runway.

After a glide distance of about 500 meters, the prototype 04 was lifted directly in front of the tower in a light gesture and soared into the sky!

"This distance ......"

Yang Fenghat, the highest row of the tower, stretched out his palm and held it flat on his forehead to block the sun, although his telescope was in the hand of Chang Haonan next to him at this time, but it could still be clearly seen that the running distance used in this test flight was much shorter than the one off the ground in the morning.

"About 600 meters?" Chang Haonan temporarily put down the telescope in his hand.

"It's about the same, it's more than 10% shorter than before the improvement." Yang Fengwan was still a little excited in his heart:

"When we were doing the wind tunnel tests, we found that the shape of the trailing edge of your slat should be optimized, and the resistance at start-up is very small, and now it seems that the actual situation should be even better than the wind tunnel results."

This time, Chang Haonan just smiled and didn't answer.

In fact, he spent almost half of the 20-odd design cycle optimizing this part.

The biggest problem with the leading edge slats compared to the leading edge flaps is that the induced drag is too high when starting.

If this aircraft has the ability to fly bricks, it is just that, but the thrust of the turbojet 14 under low-altitude and low-speed conditions is not good-looking, so the drag can still be reduced to minimize the point.

At the same time, Fu Guoxiang, who was preparing to fly around the field in the cockpit, had also discovered that this improved version of the aircraft was very different from the previous one.

From the earliest J-8 white to the J-8-2 that changed to flank air intake to the current J-8-3, he has flown almost every improved model of the J-8.

However, in each of the previous cases, it became very difficult to control when the speed dropped below 400 km/h.

In fact, the lift coefficient and usable angle of attack of the aircraft are not ideal.

A slight putt will drop high due to insufficient lift, and if the lever is pulled, it will cause the angle of attack to be too large and enter a more dangerous stall or even tailspin.

Only an extremely narrow operable section can maintain the aircraft in a controlled level flight.

If there is another disturbance from the outside airflow......

Then this interval is likely to disappear directly.

Therefore, in the past, after flying an aircraft to take off, the speed of the aircraft would be increased to at least 450km/h as soon as possible to reduce the risk of aircraft maneuvering.

But today it feels completely different.

At the speed range of 350-400 km/h after takeoff, the aircraft's maneuvering efficiency and agility far exceeded his expectations, and the stick maneuvering according to his previous habits almost scared him into a hundred battles.

Fu Guoxiang can feel very clearly that 350km/h is definitely not the limit of this aircraft.

According to general habits, the first flight of the aircraft is generally not even the landing gear, and the flight time is basically about 15-20 minutes.

However, the situation of the No. 04 aircraft is different after all, and in addition to flying around and passing through the field, this test flight was still arranged with several tasks to test the available overload at different angles of attack.

Clearly, the R&D team has a lot of confidence in the aircraft.

Therefore, Fu Guoxiang finally decided to request a lower speed through the field at the test flight station.

After a few seconds of silence, a reply came over the radio.

"Approval is requested, but the speed must not be less than 285 km/h."

(End of chapter)