Retractable air refueling pipe, the structure is more complex, now their own to engage in a fixed air refueling pipe, but also appeared in the docking because of the strength of the lack of broken things, if you make a retractable air refueling pipe, how to ensure the strength?

Moreover, although the air refueling pipe of your own side is fixed, it can be removed, that is, it can be installed when you need it, and removed when you don't need it, so that it doesn't block the field of vision? As far as the Air Force is concerned, it is definitely a long way to go to really let most pilots master the ability of refueling in the air, and the training of pilots is a big problem, and the limited number of tankers is also a big problem, so there is no need to make it so complicated.

Doesn't that big tube, stuffed into the side of the nose, take up space? Only large aircraft have such capabilities, right? For example, the Su-27, a series of aircraft, all use retractable air refueling pipes, in fact, in the future, when the troops are equipped, I have not seen many Su-27 pilots for air refueling training, even if they do not refuel in the air, the range is enough, they usually train, and even the fuel tank does not need to be filled, and even the auxiliary fuel tank does not need to be hung, what air refueling is needed.

Of course, if it can be retracted, the benefits must be greater, for example, there is no need to worry about the noise caused by this tube, and it will not increase air resistance after being put away, as for the most obvious, it must not be necessary to block your view.

Therefore, when it comes to the J-20 fighter, it will become retractable, after all, if this fighter wants to maintain a stealth appearance, the air refueling pipe must be able to be retracted.

Now, it's just an experiment with air refueling technology, in fact, the test flight of this tube, even if the wet docking is completed, is not over, it still has a lot of projects to test flight, until now, has not flown supersound, and once this kind of aircraft is officially installed, it is not possible to fly supersonic speed, after this tube is added, how much drag will it bring, and how much impact will it have on the flight? These are unknowns, and they have to be tested for flight.

In fact, the noise problem alone can be very uncomfortable.

In later generations, after someone bought a car, quite cherished, bought a lot of accessories from Taobao to install, such as what weather shield and the like, it sounds very good, when it rains, you can also open the window, the window will not fog up, but the seller will never say its impact, after installation, almost goodbye to the highway, on the highway to drive, that thing brings quite a strong noise!

The car also has to go through an aerodynamic test, and some self-righteous attachments are artificially added to the outside of the window, and it is removed after a high-speed run.

This speed, compared with the aircraft, is much smaller, and their test in the wind tunnel found out how serious the disadvantages of the aircraft in high-speed situations are after installing this refueling pipe, which needs to be gradually improved in future flight tests.

There are still a lot of obstacles in the back!

"Okay, at home, don't talk about outside topics, the meal is ready, let's eat." Gu Tingting said, she had already come up with the prepared meal, and Xiaohutou came out with a big rib in her hand, and she was gnawing there.

Eat first!

The family has not been so lively for a long time, many times, the home is empty, today to see so many people in the family, the little tiger head is the happiest.

"Well, eat first." Qin Feng also let go of his worries and threw himself into the meal on the table, his mother-in-law came, this meal is naturally an authentic Northeast specialty, and the middle of this table is pork sauerkraut stewed vermicelli.

The family was happy, Mr. Gu was very happy, and talked about a lot of the past of the year, the scene of Qin Feng's test flight of Jian-8 is still vivid, in a blink of an eye, several years have passed, and he is about to enter the nineties.

"The wind is up, the wind is up!" Hearing the whirring wind outside, Qin Feng suddenly became happy, put down his chopsticks, and rushed to the balcony, when he opened the door of the balcony, a cold wind blew in, making Gu Tingting immediately frown, what are you going to do in such a cold weather?

"The weather is going to improve, and the test flight can start again." Mr. Gu explained, of course he knew why Qin Feng was so excited, he held it for half a month, and finally the weather improved, now, seeing that it is the end of the year, New Year's Day is coming, if the test flight is completed before New Year's Day, it will be of great significance.

Mr. Gu's words, sure enough, were right, the next day, the weather suddenly cleared, and the cold wind that blew all night weakened, although the weather was colder, but for people from Shenyang, this climate was not cold at all.

Wearing a winter flight suit and carrying a helmet, he wiped his leather shoes in the locker room for the last time, and Qin Feng heard the footsteps behind him.

"Comrade Qin Feng, today's refueling aircraft test flight mission is very important, and it has reached the last moment, so today's J-7, let's fly with our crew."

Now, with the orderly progress of the test flight of the J-7, the prototype of the third aircraft has also flown to the test flight yard, and at the same time, the crew of the test flight has also increased, and now talking to Qin Feng is a group of new test pilots, Lao Yang and Lao Tang, they are both about forty years old, which is the most valuable age of test pilots, with rich experience and old qualifications.

Qin Feng originally planned to fly the J-7, and the task of air refueling was mainly based on the old man, but thinking about the last wet docking left for air refueling, it was also a difficult hurdle, and he really wanted to try it.

In this case, you have to grieve your own navigator. Qin Feng glanced at Yang Lin, Yang Lin also had a helpless expression, you want to leave me behind and fly alone? However, you are a pilot, I listen to you.

"Okay, then be careful." Qin Feng said, he glanced at the two of them again.

Lao Yang is a northern man, a little tall, with thick eyebrows and big eyes, and he looks very energetic, while Lao Tang is a southerner, who is a little loving, loves to talk and laugh, and has a smile on his face all the time.

"Today's subject, let's dock again." Lao Yang said to Qin Feng.

At this time, everyone present didn't know that this was actually the last side, and in the future, Qin Feng would often recall this scene, what would happen if it was himself on the plane at that time?

I would have made the same choice! For the sake of the aviation cause of the motherland, he did not hesitate to sacrifice his life!