The military-industrial scientific research system of the academic master

Chang Haonan's flight was still booked for the next morning.

It’s still the same Tu 154M.

But this time he was alone, and his luggage included an extra computer bag than last time.

And almost at the same time he was preparing to leave school.

On the outskirts of Shengjing, on the tarmac of Beiling Airport, personnel from the 601st Flight Test Station and the Air Force Maintenance Team were surrounding the No. 04 prototype that had just been pulled out of the assembly plant, checking the technical status of the aircraft.

Test pilot Fu Guoxiang was sitting in the cabin, making final preparations before the flight.

After downgrading Unit 03 to a non-full prototype and sending it to Yan Liang, Factory 112 and Institute 601 established a "Youth Commando Team" to prepare for the upgrade of Unit 04 in three shifts.

After obtaining Chang Haonan's calculation results, it took only one week to complete the production and replacement of the new wing.

Of course, although the No. 04 aircraft has not changed much except for the wings, it was returned to the factory for major surgery after all. Therefore, according to Yang Fenghata's requirements, all pre-flight inspections must be based on the new ones. Model standard to complete.

In other words, Unit 04 is about to make its “second first flight.”

However, according to Yang Fenghata's arrangements, the aircraft will not actually take off this morning, but will first conduct three rounds of ground taxiing tests.

This is also a treatment that only a brand-new model of aircraft can have.

This plane deserves so much care.

The more important reason is that Yang Fenghao received a call from Du Yishan yesterday, saying that Chang Haonan decided to return to Shengjing today.

After much thought, he finally decided to put the official test flight in the afternoon.

After all, Chang Haonan is the proposer and most important executor of this improvement plan, so it is appropriate for him to be a witness.

In fact, Yang Fenghao estimated at the beginning that the modification work of the No. 04 prototype would take about two weeks, so he had just approved half a month's leave with a stroke of a pen, thinking that he would be able to catch up when Chang Haonan came back. Test flight.

It's just that the efficiency of the Youth Commandos was beyond his imagination.

What is extremely coincidental is that Chang Haonan chose to return to No. 601 ahead of schedule after only a week's rest, even though he was completely unaware of these circumstances.

"Perhaps this is the bond of fate?" Yang Fenghao thought to himself as he looked at the yellow-skinned No. 04 prototype not far away.

At this moment, deputy chief designer Liu Ming came from a distance and interrupted his thoughts.

"Mr. Yang, all preparations before taxiing have been completed and everything went well. Do you want to start the test?"

Yang Fenghao habitually raised his wrist and glanced at the time.

Although he knew that the time at the test station was actually several orders of magnitude more accurate than his own mechanical watch, this habit had been maintained for many years.

"Let's get started, let's go to the tower."

Following Yang Fenghata's order, the testers and equipment that had just surrounded the No. 04 prototype began to evacuate, leaving only the power supply vehicle and air supply vehicle needed to start the engine.

Fu Guoxiang in the cockpit heard the instructions from the radio at the same time. He closed the hatch, moved his neck slightly, then put on an oxygen mask, started the two engines with the help of external power supply, and pushed Throttle the valve and allow the rpm to stabilize at 20%.

This is not the first time Fu Guoxiang has driven the J-8-3. He was even responsible for the last first flight of the No. 04 prototype, so all this is familiar to him.

According to the test flight process, the first part of the taxiing and rolling experiments is to test the stability and maneuverability of the aircraft's ground motion at speeds of 20 and 55km/h respectively, corresponding to branch line taxiing and turning under normal conditions and crowded apron. gliding in state.

The second step is to test the aircraft's correction ability under medium-speed taxiing at speeds of 80 and 160km/h.

It only took Fu Guoxiang, who was familiar with the road, to complete all the subjects in the two tests in a short time, and everything went smoothly.

Then comes the third step, high-speed taxiing, testing the performance of the aircraft's relevant rudder surfaces at 240-320km/h, approaching take-off speed, as well as the aircraft's balance when the front wheel is raised.

Ordinarily, if this is really a brand new model, then it is impossible to complete these three links of testing in one day.

However, the reference new model is not a new model after all, and many common minor problems with new phones do not exist on this prototype.

Careful inspection before the test flight is to ensure that nothing goes wrong, but once the test flight process is entered, efficiency issues must be taken into consideration.

At the end of the runway, Fu Guoxiang finally pushed the engine speed to 50% and released the brakes.

The number displayed below the speedometer keeps getting bigger as the engine roars.

Before this test flight, someone had told him that the improved aircraft's takeoff and landing performance would be better, so Fu Guoxiang controlled the attitude and speed of the aircraft very carefully.

But the actual situation far exceeded his expectations.

When the taxiing distance was close to 700 meters, it was obvious that the aircraft had a very obvious tendency to lift off the ground.

Fu Guoxiang then gently pulled the joystick to prepare for the wheel lifting test.

Suddenly, he felt a very brief cycle of overweight and weightlessness.

Obviously, at that moment, his entire plane should have left the runway for an instant, and then was pushed back by him using the lever like muscle memory.

Fortunately, his test flight experience and skills were very good, so he didn't make the first flight in advance.

The main reason is that the sensors required for taxiing tests are different from those required for flight tests. Even if we fly up now, we cannot get complete data.

"The takeoff distance of this plane is about 100 meters shorter than before."

Fu Guoxiang quickly made a judgment and reported the situation to the control tower.

At the same time, Yang Fenghata, who had been waiting here since just now, also put down the telescope in his hand.

Previous wind tunnel tests have shown that if other parts remain unchanged and only new wings are installed, the take-off speed of the aircraft without combat load can be reduced by about 12% from nearly 400km/h to about 350km/h. level, the take-off distance will also be reduced accordingly.

Although it is still incomparable with the third-generation aircraft, for the design of an interceptor aircraft, the 12% improvement is already quite exaggerated.

After all, such changes are achieved without affecting the aircraft's high-altitude and high-speed performance at all.

Many comrades did not even dare to believe this result, so they slightly lowered their psychological expectations at the discussion meeting before the first flight.

However, according to what the pilot just reported, the actual performance improvement of the aircraft is even better than the wind tunnel test results!

Yang Fenghata smacked his lips and looked out the window at the No. 04 prototype that had finished testing and was taxiing to the tarmac.

If we talk about the indicator of takeoff speed alone, it is not actually the core performance of an aircraft.

But it can reflect the lift level of the wing from the side, as well as the low-speed maneuverability that is very important for a fighter jet.

He couldn't wait to see the data from the official test flight in the afternoon.

I will update the three chapters of the three helmsmen tomorrow. If I ask the editor tomorrow and the first order is 2,500, then the day after tomorrow will continue to add 10,000.