Chapter 646 The amazing flight envelope

Song Shangcai was not a fool just now. After obtaining permission, he performed a set of flying maneuvers according to his own ideas that were not overloaded but could fully utilize all the control elements of the aircraft.

It only took about ten minutes to understand the operating characteristics of this aircraft.

Although it is not as perfect as the flight control, it is definitely no problem to conduct normal test flight subjects according to the pre-takeoff plan.

"Report to the command center and flight testing can begin."

The calm voice on the radio and the normal flight path on the radar made everyone here breathe a sigh of relief.

"Roger that!"

The commander sitting in front of the radar display simply answered with two words.

The test subjects of this flight had been memorized by the test pilot before takeoff, and the key route data of several core items had been entered into the flight computer, so there was no need to report every movement to the flight as before. Check on the ground.

Therefore, just as he was reporting the situation, Song Shangcai had already moved the throttle lever to a relatively low position and began to test the flight boundaries of the left engine bit by bit.

At an altitude of 6000 meters, whether it is supersonic or subsonic, there is actually nothing easy to measure in level flight. The main thing is to see how much performance can be maintained under some practical working conditions.

Therefore, the aircraft quickly entered the subsequent test subjects under his deliberate control.

Soon, Song Shangcai in the cabin felt from the tachometer numbers that when the air intake state was damaged, the pointer on the left side was obviously more stable than the right side.

You know, AL31F is known for its high adaptability and tolerance, and this turbofan 10 even performs better in this regard...

Of course, he still understood the principle of step-by-step. Data such as large sideslip angle and large angle of attack were naturally impossible to measure during the first flight.

For the first flight, the project is mainly shallow and comprehensive.

And judging from the current results, with the current status of the single-engine turbofan 10 of this aircraft, it is likely that the real limit cannot be measured——

The reason why the AL31F on the right is retained is originally as a guarantee.

In this way, if something happens to the test engine in the sky, it will not lose all power and electricity, and the aircraft can be brought back.

This is also a common practice in various countries when testing new engines.

However, judging from the status of this test flight, Song Shangcai is basically certain that the guaranteed engine limits the upper limit of this aircraft...

"We can only wait until both engines are replaced with new models..."

He still felt a little pity in his heart.

"Report to the command center that the 6000-meter altitude test has been completed and is ready to climb to the next test altitude."

It was still just a routine report, so while speaking, he had already pulled back the control column, letting the plane pull up its nose and start climbing.

"Copy that, pay attention to fuel consumption."

The tower's response came over the radio.

According to calculations, the light oil brought should be enough to complete the test subjects, but if everything can be calculated accurately, then there will be no need for test flights, so you still have to be careful where you should be careful in the sky.

Soon, the aircraft jumped to the second test altitude of 8000 meters.

This time, Song Shangcai was obviously more familiar with the road. He completed the same subjects in the 6000 meters in almost half the time compared to before.

Then of course it’s 8000 meters, 10000 meters…

The theoretical maximum ceiling of the J-11 is around 2.3 meters, but the turbofan is in principle inferior to the turbojet in a high-altitude environment. Therefore, the maximum ceiling of the second-generation aircraft is basically one that can actually fly and has practical significance, while the third-generation aircraft The maximum ceiling is relatively unrealistic, especially for the central lifting body type design.

Therefore, according to the plan, this test flight will only proceed to the practical ceiling, which is 18000 meters, and will be terminated.

but.

As mentioned above, if everything could be calculated accurately, there would be no need for test flights.

When Song Shangcai flew No. 1010 to an altitude of 16000 meters, he discovered that the plane, which he had become more and more comfortable with, once again failed to obey his orders...

And it's much more serious than it was at the beginning.

Maintaining level flight is not stressful, but as long as you make a slightly larger movement, the aircraft will enter various strange postures.

Although it can be corrected later, this situation is obviously not suitable to continue...

So he immediately switched back to the original safe mode.

You even need to enter a password to disable safe mode, but you only need to press a key to switch back.

The aircraft's attitude quickly returned to normal.

Only then did Song Shang discover that after restarting the integrated control of flight thrust, the speed of the left engine suddenly dropped by nearly one-third from before...

In other words, at an altitude of 16000 meters, the thrust of the left turbofan 10 is almost one-third higher than that of the other engine at the same throttle opening...

"The command center cannot test the envelope at an altitude of 16000 meters. It is currently judged that the thrust difference between the engines on both sides is too large."

After barely suppressing the shock in his heart, he took a deep breath and said on the radio.

During the test flight, no one can tell what will happen in the next second, so as long as the verification aircraft or prototype leaves the ground, it is the test pilot's greatest success.

Therefore, neither Chang Haonan nor He Ming could or would interfere with Song Shangcai's decision.

Not to mention the flight controller.

"Received, ready to return."

Although the original test subjects have not yet been carried out at two altitudes, as the first lift-off test of the new aircraft, it has obviously exceeded the task.

Furthermore, the failure to complete those two heights was not because the engine was not good, but because it was too powerful...

After a burst of cheers, a technician in charge of archival paperwork quietly approached Chang Haonan:

"Mr. Chang, how should I write this test flight log?"

The latter was stunned and immediately understood what the other party meant.

In any case, this is considered an unexpected abort of a test flight.

Logically speaking, if a problem is discovered, a follow-up fault analysis meeting will be held.

But the situation this time... is obviously quite different from before.

"Just write it truthfully, but it doesn't have to be so rigid."

After thinking for a moment, Chang Haonan replied:

"Just state it after the situation and say that the reason for the suspension is that the performance of the test engine is too strong and it is difficult to maintain the balance of the demonstrator."

There is quite a feeling of déjà vu when you smash a backboard in college and then say you can compensate, but the school must notify the criticism and publicize it for a month.

The other party understood immediately, nodded, and stopped talking.

Although the test flight just now took a long time, it actually stayed in the airspace around Shengjing and didn't fly far, so it was actually quick to return.

Therefore, except for the necessary flight controllers, the rest quickly left the control center and prepared to greet the triumphant pilots as usual.

Luo Shida was originally following at the back, but when he saw He Ming not far away, he quickly stepped forward and came to the latter's side:

"I'm talking about Xiao He. Comrade Haonan definitely looks younger than 40. When this project is completed, he will probably become the youngest academician in our country, right?"

"Uh……"

Hearing that the first half of this statement was outrageous, but the second half was somewhat reasonable, He Ming didn't know where to start for a while.

After a while he replied:

"Mr. Chang... I guess he will definitely be the youngest academician in our country."

"But he is... only 25 years old now. If he completes the entire turbofan 10, he will definitely not be able to exceed 30..."

He originally wanted to say that academicians under 40 years old were still possible, but those under 30 years old were too outrageous.

However, the things related to Chang Haonan in the past two years were already outrageous, including this one, so he suppressed his firm words again.

Luo Shida next to him suddenly felt that something was not right——

Chang Haonan has been wearing old-fashioned work clothes these days, and he doesn't care much about trimming, so he always thinks that the other person is a young talent in his mid-thirties but with a young appearance.

It turns out that he is only twenty-five this year, and he is still considered a young talent...

That was fifteen years ago...

Obviously, there seemed to be something wrong with his speculation just now.

"Comrade Haonan is twenty-five this year... so he was not responsible for the current version of the Turbofan 10 from the beginning?"

Luo Shida asked with a strange expression.

He Ming shook his head directly:

"How is it possible? It was from the beginning."

Luo Shida was immediately shocked:

"Then he was just a kid when he first started taking charge of the project?"

"Two and a half years ago... even if he was twenty-three, he wouldn't be considered a child, right?"

At this time, He Ming's attention was already on the plane that was continuously lowering its altitude in the distance. After answering, he quickened his pace.

Luo Shida was left alone in the wind.

"It's really only two and a half years..."