"We know that the second-generation machine is hydraulically operated, just like the brakes of the car, using hydraulic oil to operate the action cylinder, controlling each rudder surface, so that the computer can not interfere, to the third-generation machine, it is a fly-by-wire operation, the operating lever in the hand controls the electrical signal, and the back is also used to control the rudder surface, so that the computer can join in, and the operation of the aircraft is more advanced."

Everyone knows this principle, to be specific, Qin Feng thought in his heart, but it was inconvenient to interrupt the other party's words.

"At present, we are still in the stage of the principle block diagram, if we want to achieve this kind of fly-by-wire operation, we need to operate the lever, the servo, these are improved, replaced by the input and output device of the electrical signal, at the same time, we also need to give the lever a force feedback." Zhou Jinhai said as he drew the block diagrams.

If you are engaged in design, you can know that drawing a block diagram is the first step of design, and what function you want to achieve and what structure you need to have are all reflected from the block diagram.

"That's all?" Qin Feng asked.

Zhou Jinhai looked at Qin Feng and said, "That's all I can think of at the moment, do you have anything to add?" ”

"We pilots operate the aircraft, that is to judge the state of the aircraft first, and then operate, our set of fly-by-wire operating system, then we must also monitor the status of the aircraft at any time, right?" Qin Feng said: "We need to have an atmospheric data sensor, we need to have a fighter attitude sensor, all input to the control computer, for example, at an altitude of 10,000 meters, and in the airspace of 5,000 meters, we pull the same operating stick, the deflection of the rudder surface should be different, the high-altitude deflection is large, the low-altitude deflection is small, if only our hydraulic oil is replaced with an electrical signal, the rest is the same as before, so what's the use?" ”

Now, everyone's understanding of telex operation also needs to be improved, Qin Feng has studied aviation technology at home and abroad in recent years, and is very yearning for telex operation, but in the hands of these domestic technicians, I am afraid that it will be done simply to replace the oil circuit, so how can it be done?

In later generations, when the domestic heavy truck crossed to the automatic transmission, there was also such a situation, the driver stepped on the accelerator, the system knew to accelerate, to upshift, but what if it was uphill?

The driver knew that he was going uphill, stepped on the accelerator in advance, and as a result, upshifted! As soon as you climb the hill, you can only drop the gear when you can't move the high-end belt, and when you get to the low gear, the engine just breathes a sigh of relief, and as a result, it upshifts again! It went back and forth like this, but the climb didn't go up.

What to do at such a time? Add more sensors, if the computer knows that the truck is going to climb, it will call up the climbing program, and that's it.

Zhou Jinhai's face showed embarrassment: "In that case, our workload will be greatly increased, the danger of the experiment will also increase, and our assumption will change little by little." ”

"But our Air Force can't wait that long." Qin Feng said: "If we first engage in such a fake telex operation, what is the use? How long does it take to toss before and after? ”

When encountering technical problems, Qin Feng is a straight intestine, what to say, he doesn't care what authority the other party is, even Lao Wang has been scolded by Qin Feng, and the person in charge in front of him said that he wants to do this, no matter what, Qin Feng does not approve of it.

Zhou Jinhai's face was sad: "Our technical foundation is thin, such a rash leap forward, I'm afraid we will fail in the end." ”

Over the years, because of the low level of vision, the industrial base of the country has not been taken into account, and the indicators have been put forward one by one, and there are still fewer projects that have failed?

When the Soviet Union had the MiG-25, the indicators given by the Third Machinery Department were Double Three, and later Double 28 and Double 26, all of which did not take into account the industrial base, and all of them were defeated.

What has been done over the years? A double-hair large version based on the J-7 is so difficult, let alone anything else.

Zhou Jinhai's concerns are also for a reason, so many advanced technologies are put together, what if something goes wrong and the plane falls during the test flight?

As soon as the plane falls, the project may really be over, who dares to dabble? Who can afford to take responsibility?

"In that case, I have an idea." Qin Feng continued: "Let's use a two-seater training aircraft to modify and retain all the mechanical backups, so that the safety of the test flight will be greatly increased?" Yes, our Jianjiao-6 is completely fine, with two engines, higher safety. ”

It is very dangerous to directly modify it into a telex-operated stabilizer, but to make the above plan, Qin Feng thinks that it is very inappropriate, in order to improve safety, you can use a trainer.

In October 1957, China and the Soviet Union signed an agreement for the Soviet Union to sell the manufacturing technology of the MiG-19 aircraft to China, providing a complete set of technical data, prototypes, some bulk parts, finished accessories, etc., to be developed and assembled by the Shenyang Aircraft Factory.

The arrival of this aircraft allowed the People's Air Force to enter the era of supersonic flight, and quickly became the main force, and this domestic mass-produced MiG-19 fighter was officially renamed the J-6 fighter.

By the end of the 60s, the domestic army had been equipped with nearly 400 J-6 fighters, and some front-line aviation units had completed the replacement from J-5 to J-6 fighters, and J-6 began to gradually become the main combat equipment of the Air Force.

J-6 in aerodynamic layout and flight performance and J-5 has been very different, in order to better and faster make the original J-5 pilot transition to J-6, the air and navy are in great need of a supersonic trainer that can quickly train J-6 fighter pilots, but the Soviet MiG-19 fighter did not develop a two-seat trainer type,

Therefore, in the mid-60s, Shen Fei began to develop the J-6 trainer aircraft suitable for training J-6 pilots and other supersonic fighter pilots on the basis of the single-seat J-6.

The aircraft was a success, with more than 400 units built. Now, as the Air Force has begun to transition to the J-7, this kind of trainer aircraft will gradually become obsolete, and it is completely reasonable to ask for one from the Air Force to refit.

After thinking about it, Qin Feng continued: "In this way, the front cabin of our aircraft is converted into a review test pilot cabin, using a fly-by-wire control system. The rear compartment is a safety cockpit and retains the original mechanical control system. The small lever between the two cocksticks is controlled by an electromagnetic clutch to coordinate the fly-by-wire operation and the mechanical control of the front and rear levers to disengage and engage. When the fly-by-wire control is implemented, the rear steering stick is linked with the mechanical lever, and once the fly-by-wire control fails, the rear frame steering stick can immediately take over the control of the aircraft through the emergency cut-off switch. ”

This idea flashed through Qin Feng's mind, and it quickly turned into actual operation, and in this way, the safety was greatly improved.

After Zhou Jinhai listened, he thought seriously for a while, and in Qin Feng's expectant gaze, he said firmly: "No, in this case, the risk is still very large, and we must control the risk." ”

I thought Zhou Jinhai could agree, who knew that he would say so! Hearing this, even Wang Yang felt that a mouthful of old blood was about to spurt out, this classmate of his own was just a tendon, too stubborn, how to convince him?