The Military-industrial Scientific Research System of the Academic Master Chapter 792

Chapter 792 Need for early warning aircraft

A roll rate of 140° per second is not an astonishing number if placed within the entire range of a fighter jet.

The F16 Mirage 2000, which is far away, and the J-10 and Rafale, which are close by, all far exceed this number. The high ones can even reach more than 300° per second in the net configuration.

However, it is obvious that these aircraft are designed to be highly agile.

For a heavy fighter that is not good at this - in fact, it has always been a shortcoming in the past, this number has improved quite significantly.

All of this was recorded by the J-11AS flying slightly behind.

“1121, your roll is very fast, and the rolling process is smooth, almost no height loss, very good.”

Even top test pilots need to take a break between two test flight subjects, so the two planes in the sky are taking advantage of this time to communicate via radio.

“I feel that this has not reached the limit of the strength of the aircraft body, but I am afraid that flaperons alone cannot provide a higher rolling moment.”

Fu Guoxiang's voice was mixed with a slightly rapid breathing:

“I'll turn 180° first and try increasing the speed by 100.”

At the same time, as the first rolling test ended, there was a burst of applause inside the tower.

Although today's wireless data transmission efficiency does not support processing high-definition images, by integrating an additional set of antennas and sensors inside the prototype, some basic flight data can be transmitted back to the tower in real time.

This improvement is actually indispensable for a smooth test flight, but if there is any malfunction or even an accident during the test flight, it may become the key to solving the problem.

Although this kind of thing has not happened for several years, everyone still has to keep this string in mind.

Aviation safety, if it is relaxed even a little bit, will most likely lead to a landslide.

“Mr. He, it seems that your body structure upgrade has been very effective.”

Chang Haonan looked at the flight parameter curve displayed on the screen in front of him, and his tone became much lighter.

Although He Ming next to him looked as calm as water on the surface, the corners of his mouth that were suppressed by the general when he spoke still revealed his inner excitement:

“We have actually determined the effect of the upgrade of the airframe structure before. Now that we can implement this theoretical effect, we have to thank you, including Mr. Chang, for providing us with new technologies and new processes for Project 11.”

His statement is of course not entirely false.

The Su-27SM, which uses the same airframe next door, made its first flight more than half a year ago, verifying the effectiveness of this configuration.

In addition to the improvement in structural strength, which relieves the restrictions on roll at the flight control level, more importantly, the length of the flaperon in the new configuration is significantly increased, almost occupying the entire trailing edge of the wing, so it can be more active Participate in rolling.

But the design is the design, and the object is the object.

Otherwise, the planes built by Stan Aeronautics would not be so uncomfortable.

For China, which has just completed the production of the basic model Su-27SK, it is already very rare to have no problems after a major structural and process upgrade.

"Actually, Lao Fu feels that there is no problem. In terms of structural strength alone, this aircraft actually has a lot of room for improvement. I heard that Sukhoi is working on installing the AL31FU on a Su-27SM prototype. Let's try it. Where is the limit?”

AL31FU is the engine used by the No. 711 technical demonstrator. Compared with the AL31F, it has increased thrust and, more importantly, has thrust vector control (TVC) capabilities.

The body of the Flanker is inherently large, and the two engines are installed far away from the central axis, so the moment of inertia is very large.

In the past, the main factor that restricted the increase in roll rate was structural strength, so this problem was not very obvious.

Now, as Fu Guoxiang said, flaperons alone can no longer meet the requirements.

However, everything has two sides.

If a TVC nozzle is installed, then the original simple burden can provide rotational torque in one turn.

In this case, the engine position is far away from the center line, which actually becomes an advantage. “Take it step by step.”

Chang Haonan put his hands behind his back:

“After the Turbofan 10 is completely finalized for production, upgrading TVC capabilities will definitely be put on the agenda.”

Thrust vector is not necessarily of much use.

But something is better than nothing.

For a high-thrust engine, the thrust-to-weight ratio will not be lost much, and the TVC nozzle will not consume life when it is not working.

As long as you use it once, you will earn blood.

However, the priority can indeed be slightly further back.

After all, China has never accumulated technology in this area in the past.

It is not difficult to create a rotatable nozzle. What is difficult is to write this thing into the flight control.

He Ming didn't press for it, he just mentioned it in passing, so everyone's attention quickly returned to the display screen.

After the first test, Fu Guoxiang conducted several more tests in the transonic range with steps of 100km/h.

As the speed increases, the efficiency of the flaperons on the outer wing sections will decrease, so the roll rate will inevitably be affected.

However, even at the lowest speed of 1350km/h, it still maintains a level of about 60° per second, which is far higher than before the improvement.

“It seems that the four simulated mounts have not a great impact on the performance of the aircraft..."

He Ming touched his chin and nodded, obviously very satisfied with the test results.

“This is also the inherent advantage of Su-27.”

Chang Haonan replied:

"When Project 11 was just started, 601 also studied whether to consider setting up a conformal fuel tank between the two engines to further extend the range. However, after later research, it was found that the gain outweighed the loss, so you have not seen this plan. A set of aerial oil receiving devices has been added.”

The Flanker's fuselage puts the best hanger position between the two air inlets in the middle of the fuselage. This is a low-pressure area, so the resistance is very small. It is generally chosen to hang large-size ammunition here instead of under the wings.

If four medium-range bombs of the size of R77 or 霹雳12 are mounted in parallel, the impact on flight performance will be almost negligible.

While the two were talking, the data on the screen also showed that prototype No. 1121 began to slow down and returned to level flight.

Today's test content has been completed and it's time to return.

“Mr. Chang, according to the current progress, the basic flight performance test will probably be completed soon.”

He Ming suddenly said:

“The next step is to wait for the delivery of the PL-12 and PL-13 test bombs, and then conduct the testing of the airborne avionics and fire control systems.”

“Thunderbolt 12 should be fine. The 1493 radar itself can cover the entire envelope. But if we want to test the Thunderbolt 13, we may need an early warning aircraft to provide additional target information at a longer distance.”

Compared to TVC, which was just mentioned casually, this matter is indeed more important.

This is true both for the Pili 13 and the entire Chinese Air Force.

“The ring project can no longer be counted on. I heard that the Davidian side has even begun to prohibit technicians from the 14th Institute of Electrical Engineering from approaching the aircraft.”

Chang Haonan put on his coat and walked outside, preparing to greet the triumphant test pilot, and said to He Ming, who was half a step behind:

“However, the Air Police 200 that made its first flight at the beginning of the year has now been equipped with a real radar array. If no major problems are found in the electronic equipment and data link, it will definitely be able to catch up with your test firing and target shooting.”

(End of this chapter)

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