"First of all, it is impossible to change the air intake on both sides." Mr. Gu said.

Last time, Qin Feng said clearly that if you want to solve this problem, you have to change the air intake at the nose, so when everyone sat down to study countermeasures, his first sentence blocked Qin Feng's suggestion.

Changing the nose air intake is definitely not so simple, it seems that the nose of the MiG-23 is cut off and installed on the J-8? The plane is not built with building blocks, so many lines, how to dock, the inner partition frame, the stress beam, how to fit together?

Not to mention that after the change, the aerodynamic layout of the entire aircraft will all be changed, and the wind tunnel must be re-blown, so that it will take two years to do the least!

This aircraft requires that it be finalized at the end of the year, so it is absolutely impossible to do it, and other ways must be found.

In later generations, this kind of thing also appeared for the second time, that is, the plan of the Super Seven fighter, Pakistan codenamed Sabre 2, when Grumman joined in, it was planned to simply dock the nose with one of their fighters, at that time Cheng Fei was resolutely opposed to this, because they were familiar with the structure of the J-7 and knew that this simple docking was definitely done by a layman.

Now, Mr. Gu's meaning is very clear, we already know the cause of the problem, then it depends on how to use the simplest way to solve the problem in the current situation.

After Mr. Gu finished speaking, looking at Qin Feng's face, his face did not change much.

That day, he said that unless he changed the nose, of course, it was the best alternative, but Qin Feng also knew the severity, because of this one obstacle, then change the nose, which was equivalent to tearing down and starting over, it was absolutely impossible.

How to solve the problem in the existing situation?

Everyone was thinking bitterly.

"Comrade Qin Feng, we already know the reason for the air stop, and we have found that your operation of restarting the air engine seems to be different from our plan." A technician asked.

With experience this time, Qin Feng did not restart the engine repeatedly like last time, adjusted the attitude of the aircraft, and succeeded in restarting it at one time, it was like understanding the temper of the J-8.

"If our engine wants to restart, it requires certain conditions, compared to the J-7, although our J-8 fighter uses the same type of engine, but it is more difficult to restart, I have studied it carefully."

The two successful restarts, and both of them were successful starts, already showed that Qin Feng's analysis was completely correct, and now, he looked at everyone and said, "First of all, in the sky, don't expect to start our engine, it's completely in vain. ”

"Why?"

"Because the temperature is very low in the air, and the cold air blows into the combustion chamber, our ignition device cannot ignite the fuel injected into the combustion chamber, and the fuel can't even atomize into place, and it is blown out directly."

Everyone nodded, for this reason, everyone can also think of it, the temperature at high altitude is low, and it is indeed difficult to restart the engine.

"If that's the case, we'll be lowered to a mid-altitude of six or seven thousand meters, and it should be time to meet the conditions for activation." Wang Yang said on the side: "Why did we start in the hollow and didn't succeed, and we had to drag it until the low altitude?" ”

Qin Feng has the experience of starting six times in the air, and Wang Yang has also started it three times, at high altitude and in the middle of the hollow, it is not successful, only at low altitude, why is this?

Qin Feng shook his head helplessly: "It's not that this air intake cone is doing a trick, when our engine stopped, the air intake cone was stuck." ”

"Smack!" Wang Yang slapped his head with one hand and suddenly realized: "I understand!" ”

The higher you go, the thinner the air, the less drag the aircraft is subjected to, the higher the speed, so to speak, most of the fighters can fly to Mach 2, that is all high-altitude data, at low altitude, with the strength of milk, at most just over the speed of sound.

In this way, the test of high gauge speed is carried out at high altitude, and when the speed is high, the air intake cone will stick forward to reduce the airflow into the air intake, otherwise too much air will come in.

If it is a normal flight, of course, there is no problem with all this, but when the engine is stopped, at high altitude, the temperature is low, in the hollow, although the temperature is up, but the air intake is small, the front air intake cone is still in accordance with the state of high-altitude flight, stretching out very long, the air flow in the air intake is not enough, the engine has been emitting black smoke, burning is not sufficient, that is, it cannot be started.

In this way, it was not until the low altitude and the air was dense enough that the start was successful.

"So, in the future, this aircraft can only be started at low altitudes, and once the start is unsuccessful, it can only parachute?" Wang Yang continued to ask.

"Yes, there is only one chance, and you still have to be skilled with your hands and feet, unless we set up a manual mechanism that can retract the air intake cone."

When he said this, Qin Feng suddenly burst open: "I thought of it!" ”

"Yes, that's the solution." Mr. Gu said.

Both of them thought about it, Lao Liu was still pondering there, he pushed his big black plastic-framed glasses, and said, "What did you think of?" ”

"Qin Feng, let's talk about it." Mr. Gu said.

"The reason why our engine stops in the air is because in the fast maneuver, because of the obstruction of the nose intake cone, the airflow in the intake tract is greatly reduced, and the engine cannot absorb enough air and stalls." Qin Feng said: "Then, if we want to solve this problem without changing the layout of the air intake, we can only design a complex linkage mechanism. ”

When this word was mentioned, Qin Feng's heart was very uncomfortable, did he have to solve it through such unconventional means? The more cumbersome this is, the simpler the design of the fighter, the better, and the chance of problems in the future will be greater.

"As long as we pull the operating lever and the fighter performs a high-speed and overload maneuver at high altitude, then automatically adjust the air intake cone and let the air intake cone retract, so that the oxygen is enough, and the engine will naturally not stop."

How complex should this system be?

This is not something Qin Feng is worried about, in short, if you want to solve the current problem, that is, to design a set of attack angle compensation mechanism that integrates two sets of control systems for flat tail deflection and air intake cone protrusion, so as to effectively solve this problem of air parking.

If it's fly-by-wire, that's great!

For fly-by-wire fighters, it only takes a few more lines of code to solve when writing the flight control program, and now, I don't know how long these technicians will have a headache.