Where is the danger?

If the fly-by-wire system is fully adopted, then the test flight institute will have to write a large number of operating procedures for the J-6, once any one of them makes a mistake, it may bring catastrophic consequences, even if it is a two-seater, there are two test pilots, once the aircraft falls into a special situation, such as the terrible stall tailspin, both of them are dizzy, then it can't be changed.

Compared with their simple method of replacing the oil circuit with an electrical circuit, the danger is still much higher.

It's better to take it one step at a time.

"Then I have another solution." At this moment, Qin Feng spoke again, "If you feel that such a plan is still very dangerous, why don't we change the three-axis to a single-axis?" ”

With the middle of the fuselage as the reference point, up and down, left and right, front and rear, this is a three-axis, three-direction control, for the fighter is flying in three-dimensional space.

Of course, such a change is significant, especially now, and it is really risky to have a designer who is just starting to learn digital circuits to design it.

If the three-axis is changed to a single axis, it will be different, only one direction is fly-by-wire operation, and the other direction is still mechanical operation, which can greatly reduce the risk.

When Qin Feng said this, he saw that Zhou Jinhai's eyes were different from just now, they had completely brightened, he pushed his glasses and said, "Keep talking!" ”

Single axis, that is, one direction, which axis to choose?

Undoubtedly, of course, in the pitch direction!

The pitch direction is longitudinal, and in the three directions of the aircraft, if you want to switch to telecommunication, the longitudinal direction is the most needed.

Just look at the later generations of Thunder Dragon, as a low-cost aircraft, if all the fly-by-wire operation is used, the cost is too high, so it is simply a one-way fly-by-wire operation on the pitch.

What is the use of this direction?

It can control whether the aircraft climbs or dives, and in fighter jets, this action is very useful, for example, in order to sneak attack the enemy, it is necessary to penetrate the defense at a low altitude and high speed, and if there is an obstacle in front, it is necessary to quickly pull it up, at this time, the agility of the telex operation is shown.

If there is a navigation pod, it can be integrated with this longitudinal operating system to automatically control the aircraft's climb and evasion.

In bomb dropping, dive is also crucial, and the bombing pod and its combination can greatly improve the accuracy of dive bombing.

The three-axis is changed to a single axis, in this way, the writing of the telex operation program is greatly reduced, and the risk is naturally reduced.

After all, domestic fighters are still anxiously waiting for the research and development of the fly-by-wire operating system, not to mention anything else, just the J-9 project that Qin Feng knows, and wants to use digital telex, it is said that Hongdu is developing the Qiang-6, and it will also be on the digital telex, if everyone waits for the test flight institute, it must be done by themselves.

In order to reduce the risk, the use of a two-seater, with a complete mechanical backup, and at the same time, only one direction of telex operation, is this not enough?

"I think this option can be considered." Zhou Jinhai said, after speaking, he pondered for a while, and continued: "Just follow this plan, I have perfected the plan, and I will report to my superiors!" ”

Just do it, if it doesn't work, it won't work, Zhou Jinhai, as a technician, also has a kind of unique straight line of technicians, and he won't beat around the bush.

"Okay, let's talk about it in more detail." Qin Feng said, took the pen and paper on the table, and continued to refine the block diagram.

"Digital pneumatic stabilization system, analog electro-hydraulic servo human sensing system, digital target tracking and display system, airborne data acquisition and recording and telemetry transmission system, test signal amplifier, atmospheric turbulence signal generator and various sensors, converters, electrical and hydraulic accessories."

Qin Feng was dense and drew hundreds of block diagrams, when he saw this block diagram, Wang Yang felt a little dizzy in front of him, how complicated should this system be?

Zhou Jinhai listened very energetically, and the two continued to discuss this block diagram, time flew by, and in a blink of an eye, it was dark.

Wang Yang had already drunk the sixth glass of water, and he was even about to urinate.

"Hey, if you don't stop, there will be no food in the cafeteria."

"It's okay, we have it in the pilot cafeteria, I'll secretly take a lunch box and bring it out for you." Qin Feng said: "Let's go on, then we should analyze the transmission of the signal, this can't be any problem, if the signal is wrong, it should have climbed, but it turned out to dive, then it would be troublesome." ”

Wang Yang could only shake his head helplessly.

If it weren't for the test flight the next day, Qin Feng and this Jinhai brother would probably be able to talk about dawn!

Wang Yang already secretly had a speculation in his heart, it seems that this is just the beginning.

Sure enough, in the next time, as long as Qin Feng finished the test flight, he immediately ran to Zhou Jinhai, and the two of them studied the technology, which was fascinated.

Qin Feng seemed to have the motivation to make it uncontrollable, and he was very attentive to the project of changing the stability machine.

"Comrade Qin Feng, if you go to help Comrade Zhou, everyone is proud of you, but you must pay attention to the fact that test piloting is a sacred profession, and you must have abundant energy." On this day, Qin Feng was carrying a flying helmet, and before he stepped on the fighter plane, he heard Regiment Commander Li speak to him.

"Yes, Captain Li, you're right." Qin Feng said: "Please rest assured, I will not delay our test flight mission." ”

"Look at your red eyes, forget it, don't fly today." Head Li said.

It was too late to study last night, Qin Feng got up today, his eyes were bloodshot, and when Head Li said this, Qin Feng suddenly became a little anxious: "Head Li, I promise, I can fly, absolutely no problem." ”

Commander Li shook his head: "Today's test flight mission, let Wang Yang fly, you can stay on the ground, and it can be regarded as giving you a long memory." ”

While speaking, Wang Yang had already put on his helmet and stepped onto the plane.

Qin Feng was a little frustrated, but he knew that Commander Li's criticism this time was completely correct, he couldn't stay up late just because he was young, the test flight work was sacred and dangerous, and he had to maintain his physical strength.

Looking at Qin Feng's appearance, Head Li was also a little funny in his heart, on the one hand, it is true that Qin Feng is in a bad state today, on the other hand, it is because there are superior leaders who are coming today, Qin Feng's late first-class merit was finally approved, and today the superior leaders came to inspect and came to present the award by the way.

Piloting a fighter with the engine turned off, sliding back to the base, preserving state property and preserving a large number of test flight data, this feat alone is enough for a first-class feat.

There is also a tail spin test flight, as well as a contribution to the J-8 test flight, and how many first-class merits will there be in the future?