"Comrade Pugachev, will we be able to fly this plane?" Qin Feng came up and asked, this first question made it difficult for the other party to answer.

Can you fly? Of course you can't, until now, you haven't received professional training, this is definitely not able to fly, but, if you directly say that you can't fly, it seems a little inappropriate, just said casually, now I don't agree?

"Not for now, because the plane is now in need of routine maintenance." Pugachev said: "You will have to wait a while. ”

After a while, your own plane will come, and when the time comes, you will naturally be able to fly.

"How did you do it when you were flying the Cobra?" Someone asked again that these maneuvers are the most pleasing to the eye, so it is normal for someone to mention such operations.

"It's simple, pull the lever up, pull it up, pull it up, let go, it's okay." Pugachev stood there and said while making imitation movements, and the scene resounded with laughter, and he had a good impression of this comrade test pilot.

"The engines of this plane, how does it feel to operate? Can the engine keep up with frequent throttle changes? At this moment, Song Lao spoke.

With the introduction of aircraft, all kinds of technical data of fighters have also been handed over to the country, so if you talk about the length, diameter, thrust, etc. of this engine, these are not secrets, but only these are not enough.

Many engines, the data on paper sounds very advanced, but in fact, a single reliability is not enough, for example, turbofan six, as a high-thrust engine, many times can't even start, random rapid acceleration will surge, can not work normally at all.

Now, what Song Lao is most concerned about is this engine, how does it feel to operate?

"It's great." Pugachev said: "This engine is the best fighter engine ever built in the Soviet Union!" ”

Pugachev was very satisfied with the engine of this aircraft, without which it would not have been possible for the Su-27 to break out of the cocoon.

"So, does it have a follow-up model?" Song Lao said: "For example, the thrust increases, or is it a vector nozzle? ”

After an engine is developed, there is no end, this is only the beginning, and it is also a common practice to continue to increase the thrust of the engine by continuously adopting new technologies on the basis of this engine.

Even the second-generation Spey engine once had an improvement plan to make it reach 11.5 tons of thrust, but unfortunately this foundation was too poor, and it was not successful in the end.

If you want to improve, there are generally two aspects, improve the compressor to let more air enter, one is to increase the front temperature of the turbine, and this vector nozzle is another way to improve, which is to improve the maneuverability of the fighter.

The problem? Pugachev frowned a little, what the other party proposed was already something he couldn't answer, after all, he couldn't leak it, the engine with increased thrust, of course, was, for example, on the Su-27K, the engine with greater thrust was used in order to offset the weight gain problem of changing to a carrier-based aircraft, and at the same time, the vector nozzle was also being studied.

These have nothing to do with the Su-27, why is the other party so interested in engines?

"I'm sorry, but I don't know much about that." Pugachev said.

This is inconvenient to answer, just fool the past, after he finished speaking, he looked at the other party a few times, suddenly thought of something, and couldn't help asking: "Are you from Chengdu?" ”

Negotiations on the introduction of the Su-27 have passed, and at the same time, the Chinese side has also revealed some willingness, such as wanting to buy their engines and install them on another type of aircraft, which is produced in Chengdu, Pugachev once heard, and now this old man is obviously not from the Air Force, but a technician, and the questions asked are all engines, that is, they came to the engine, maybe they are experts from Chengdu?

"That's right." Song Lao said: "We are very satisfied with the performance of your engine. ”

Song Lao sighed, the current J-10, has been carried out to the point of metal prototype, is still designed with turbojet 15 as the power, now, change the AL31F engine, it seems to have become a consensus, although it is said that the engine will make the fuselage overhauled, a lot of work, but Song Lao still prepared in advance.

Since it can't be changed, if you have to accept it, you have to prepare as soon as possible, and there is not much time left for aviation people.

"Is it easy to restart this engine once it turns off in the air?" Song Lao continued to ask.

For a twin-engine fighter, having lost one engine, it is possible to fly on another engine, but for a single-engine fighter, once the engine is turned off, it is a big trouble.

The Al31F is prepared for a twin-engine fighter, once it is changed to a single engine, is there a high probability of stalling and restarting?

"Please rest assured, if you have read the information, you will know how wide the envelope of this engine is, in the air, the lower limit of the starting speed is 450 kilometers per hour, generally speaking, as long as the height is not less than 500 meters, there is no problem with restarting, and it is still automatic." Pugachev said: "I have flown more than a dozen test flights in the air restart, and each time I was easily successful. ”

For the engine of the fighter, it is not easy to start, when on the ground, all kinds of preparations must be made, the engine is brought up with an external starter, and after the speed is enough, the fuel is injected, and then it can be successfully started, even if it is the third uncle, it takes a minute, and the turbofan that was successfully developed later takes ninety seconds.

This is still on the ground, there is an external power supply car can be used, but in the air, these are impossible, the fighter is equipped with a battery, at most to supply the operating system power, it is impossible to start the engine, so, air start can only rely on one way, that is, wind.

The fighter plane is flying forward, and the wind will flow into the air intake continuously, and as long as the wind speed is high enough, it can blow the engine up, so that it can directly inject fuel, and then start in the air.

Generally speaking, the normal flight speed of the fighter is higher than 450 kilometers per hour, so there is no problem with restarting, and the system will automatically restart when it detects that the engine is stopped.

What if the speed isn't enough? Then it's time to dive, and the dive can increase the speed, and when the speed is enough, the engine will be brought up, and it will be successful.

As long as 450 kilometers per hour, even if it is only at an altitude of 500 meters, you can dive and reach this speed.

Even if it is changed to a single-engine fighter, it is safe enough.