According to the requirements before the test flight, in order to prevent the characteristic chrysanthemum of this aircraft from being photographed by people with good intentions as much as possible, the afterburner state should be maintained after take-off until it climbs to an altitude of more than 3,000 meters and then changes to the normal test flight subject.

The afterburner is used to climb faster, and the second is to take into account that if someone really squats to climb the process, the dazzling tail flame will easily overexpose the camera, and it is difficult to take clear images near the engine.

The Su-27 itself in the state of no-load light oil has a thrust-to-weight ratio of more than 1, and this one was temporarily pulled out of the latest batch after weight reduction, so even if it is a two-seater type with slightly poor maneuverability, it is still smooth to make such a move.

In addition, it was a little cloudy on this day, so it was only a few breaths, and Chang Haonan and the others holding the telescope could not see the shadow of the plane.

"Tut-tut......"

Although they couldn't see anything anymore, except for Chang Haonan, who had been watching in 624 for almost a thousand hours, the rest of the people still looked unsatisfied, and they were even reluctant to put down the binoculars.

"This tail flame ...... It's so blue that it's all purple......"

Luo Shida, who was standing on Chang Haonan's left-hand side, was originally a little hunched over because of his old age and the recent work intensity, but at this moment, he actually stood straight:

"I've never seen such a beautiful ...... before"

Speaking of this, he finally put down the binoculars and turned his head to look at Chang Haonan next to him:

"The back waves of the Yangtze River push the front waves......"

The latter is now basically immune to this type of appreciation, and under normal circumstances, even when the other party is still laying the groundwork, he has already prepared the polite words of a routine response just by subconsciously.

But Luo Shida did not play cards according to common sense at all:

"My Lao Luo has not been retired for a few years, but I have never heard of such a turbofan 10 before the year before last, Comrade Haonan is really a good strategy......"

"Wherever you are, it's not just ......"

Chang Haonan said half of his words, and then he felt as if something was wrong-

How does this old comrade's focus feel different from others?

But the other party is an elder after all, and Luo Shida is also a Taishan Beidou-level figure in the field of aviation manufacturing, so he can't let the other party be cold.

Therefore, after thinking about it for a while, he replied:

"I can't talk about any strategy, the main thing is that the comrades of the project team work together, otherwise even if I have a ready-made plan, I won't be able to move forward so quickly......"

As a result, Luo Shida heard his answer, the donkey's lips were not in the horse's mouth, not only was he not in a hurry, but he smiled mysteriously:

"It's okay, I know, the string of secrecy needs to be tightened...... You don't have to answer directly......"

“……”

Chang Haonan was stunned, and almost blurted out and asked the other party directly what he understood.

But I don't think it's appropriate.

As a result, he was completely speechless for a while.

And Luo Shida, who was on the other side, saw him speechless, but confirmed the plot he had just made up in his mind, and didn't say more, just turned his head with a mysterious smile, raised the telescope again, looked at the sky where there were only clouds left, and at the same time took the initiative to switch the topic:

"Tail flame of this color...... I'm afraid the temperature before the turbine is not low......"

In fact, in the years before Chang Haonan's rebirth, as the temperature in front of the turbine increased to more than 2000K, engineers no longer believed that there was a strict correlation between the color of the tail flame and the temperature.

But as we approach the millennium, this perception is not problematic.

So he nodded directly:

"Yes, the temperature was relatively low when it was first designed, but the cooling technology and new coating developed later were so good that it was raised by more than 200 degrees......

Chang Haonan's answer made Luo Shida raise his eyebrows, and said in his heart that this means that the turbofan 10 also encountered an iterative upgrade of active cooling technology in the research and development process, and it will definitely not be completed in more than ten years, my previous guess is really right......

If the latter is allowed to make up for it like this, there will not necessarily be any outrageous plots.

Fortunately, at this time, Song Shangcai's voice came over the radio:

"Report to the command center, altitude 6000 has been reached, request to switch flight mode to 'test' state."

The people standing in front of the window suddenly regained their serious expressions, put down the binoculars in their hands, and returned to the radar screen in the command center.

"Roger, approve request."

The commander, who was sitting behind the communication terminal, replied decisively.

……

At the same time, in the cockpit of aircraft 1010, Song Shangcai quickly entered a string of four-digit numbers in the multi-function display, and then pressed "confirm" to lift the lock restriction of the flight mode-

As He Ming said before, the flight controller of this J-11WS has been verified on the J-8IIACT a long time ago, and the turbofan 10 has full digital control capabilities, so it directly realizes the integration of flight propulsion at the control level.

It can even be regarded as the second flanker in the world to have this ability.

Directly at the flight control level, it stood on the same running line as the No. 711 high-mobility verification aircraft.

Compared with the traditional flight control system where the rudder surface and power are controlled separately, the biggest advantage of realizing the integration of flight and thrust lies in the action of the pilot's hands and feet, which is no longer directly controlling the power and rudder surface of the aircraft, but directly controlling the behavior of the aircraft.

For example, the most common action is to push the throttle stick with the left hand.

In the past, this action was actually increasing the speed of the engine, thus pushing the aircraft to increase its speed.

However, as for how, how much, and when the rpm will increase, it is up to the pilot to judge for himself.

However, for the control system of flight thrust integration, the action of pushing the throttle stick is only equivalent to imposing an acceleration command to the aircraft, and the flight controller will automatically coordinate the cooperation between the engine thrust and the rudder surface to make the action expected by the pilot.

This capability is basically useless for normal aircraft in level flight, but for fighters that need to perform various extreme maneuvers, it can greatly reduce the operating pressure of pilots.

On this J-11WS, considering that the aircraft still has to ensure a basic safety during take-off and landing, and the flight test subjects are also completed in the sky, the thrust control under normal flight conditions is specially handed over to the flight controller when designing the flight control.

In other words, the test engine automatically keeps the thrust as close as possible to the other engine, and the aircraft's six rudder faces are automatically adjusted to minimize the deviation of the aircraft.

This is also the reason why Song Shangcai saw that the pointer of the engine tachometer on the left side was relatively small before taking off-

When the thrust at full throttle is larger, it is necessary to ensure that the thrust is the same as that of another engine, and the speed ratio is naturally reduced.

It's just that the turbofan 10 with full power and electronic control adjusts the thrust much faster than the AL31F with electronic control + hydraulics, so at the moment when the throttle changes, you still have to take a little lever to ensure balance.

Now, after putting the flight mode in 'experimental' mode, neither of these layers of protection is gone.

Both engines maintain the same throttle opening depending on the position of the throttle valve.

Sure enough, almost at the moment when Song Shang pressed the confirmation button, the turbofan 10, which had just been holding on hard, finally lifted the seal.

He felt the whole plane jerk to the right, and almost subconsciously stepped on the left rudder, trying to drag the plane back to flying straight forward.

But anyone who has ever flown an airplane knows that in the absence of flight controller participation, the impact of power asymmetry cannot be compensated for simply by adjusting the vertical tail action surface.

Therefore, although Song Shangcai had made a lot of preparations before taking off, it was still a little difficult to control the amount of movement on his feet at first glance.

Especially when he changes the throttle and does the preset flight maneuver at the same time, it is simply awkward and awkward.

Just a big slope turn that doesn't drop height, he tried three times before he made it.

"Unit 1010, is there a problem?"

The tower commander asked with some concern when he saw the abnormal track on the radar.

"Reporting to the command center, the thrust of the left engine is too big, and the throttle response is much more responsive than in the past, and I need to get used to it for a while."

Although Song Shangcai's experience is not as experienced as Fu Guoxiang, he is also from a serious test pilot training unit, and he is confident that he will adjust in a relatively short period of time.

The latter nodded, signaling to listen to the pilot.

Although this flight brought light fuel, thanks to the J-11's innate large fuel load, it was more than enough to complete the test flight subject. 、

Hearing such an answer, the commander glanced back at Chang Haonan, who was standing behind him, obviously asking for advice.

"Just listen to the pilot."

Chang Haonan pressed one hand on the other party's shoulder and said in a deep voice:

"The performance of this engine has improved too much, and it is normal to not get used to it at first, but there is no major problem."

(End of chapter)