The Military-industrial Scientific Research System of the Academic Master Chapter 646

Chapter 646 Amazing Flight Envelope

Song Shangcai was not too arrogant 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 carry out 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 return to normal flight path on the radar made everyone here breathe a sigh of relief.

"receive!"

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, while reporting the situation just now, Song Shangcai had already moved the throttle lever to a relatively low position and began to test the flight boundaries of the engine on the left little by little.

Of course, he still understands the principle of gradual progress. Naturally, it is impossible to measure data such as large sideslip angle and large angle of attack during the first flight.

The response from the tower 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, there will be no need for a test flight, so you still have to be careful where you should be careful in the sky.

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...

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

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

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

“Received, pay attention to fuel consumption.”

Soon, the aircraft jumped to the second test altitude of 8,000 meters.

So the plane quickly entered the subsequent test subjects under his deliberate control.

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

It was still just a routine report, so while speaking, he had already pulled back the control stick to let the plane raise its nose and start climbing.

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.

“Report to the command center that the 6,000-meter altitude test has been completed and is ready to climb to the next test altitude.”

The reason why we want to retain the AL31F on the right is originally to serve as a guarantee.

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.

He still felt a little pity in his heart.

At an altitude of 6,000 meters, whether it is supersonic or subsonic, there is actually nothing easy to measure in level flight. It mainly depends on how much performance can be maintained under some practical working conditions.

Then naturally it's 8,000 meters, 10,000 meters…

“We have to wait until both engines are replaced with new models...”

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

The theoretical maximum ceiling of the J-11 is around 23,000 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.

So, according to the plan, this test flight will only proceed up to the practical ceiling, that is, it will be terminated at 18,000 meters.

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 16,000 meters, he discovered that the plane, which had become more and more comfortable in his hands, 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.

Disabling safe mode even requires entering a string of passwords, but switching back only requires pressing a key.

The aircraft's attitude quickly returned to normal.

Song Shangcai discovered that after restarting the integrated flight thrust control, the speed of the left engine suddenly dropped by nearly one-third from before...

In other words, at an altitude of 16,000 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, the 16,000-meter altitude envelope cannot be tested. 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, the test pilot is the biggest.

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

Let alone the flight controller.

“Received, ready to return.”

Although the original test subjects are still at two altitudes, as the first lift-off test of the new aircraft, it has obviously overfulfilled 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 for a moment 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 a sense 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 said no more words.

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 fast to return home.

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?”

"Well…"

Hearing that the first half of this statement was outrageous, but the second half was somewhat reasonable, He Ming was a little confused as to where to start.

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. After completing 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.

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

And next to him, Luo Shida 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 I am only twenty-five this year, so I am still considered a young talent...

That ten years ago was fifteen years old...

Obviously, there seems 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 took 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 in the distance. After answering, he quickened his pace.

Leaving Luo Shida alone in the wind.

“It's really only two and a half years…”

(End of this chapter)

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