readx; For the test flight mission, it does not matter how long it takes to complete the task, the important thing is how many hidden problems can be found in the process of the test flight, and only if these problems are found and do not happen again after correction, then the test flight mission can be regarded as a success. Pen & Fun & Pavilion www.biquge.info

If we find a problem and do not deal with it, but continue to test flights for other missions, then if it is not done well, it is very likely that the plane will be destroyed and people will die, no matter which country, the lives of test pilots are very precious, although their work is very dangerous, it can be said that no country can use their lives to do what they know is dangerous.

When the fighter landed steadily at the No. 1 airfield, everyone was secretly relieved, because the fighter found a problem, but fortunately it was not a serious problem, and it could be re-tested after correction, and as long as it did not reach a certain altitude, it would not be dangerous to the pilot.

Although his surname can be regarded as very good so far, and it is not much different from the Hellcat fighter, even if these two fighters are against each other, it is impossible to say who will lose and who will win, if it is only about the surname Neng, I am afraid that this group of people will be more inclined to the fighters developed by themselves.

"Oh God, how can there be so many ventilation points."

After the ground crew helped Zhu Dazhang off the fighter, Feng Kármán hurriedly sat in the cockpit, closed the cabin cover, and looked at the countless small black dots drawn by Zhu Dazhang on it, and immediately felt Alexander, and at the same time was very surprised, because this design was designed according to the design of the Hellcat fighter, and the theory said that there should not be so many problems.

So, von Kármán kept pushing and pulling the canopy, trying to find the problem, and now the canopy is pushed back and parallel to the opening, so many pilots like to open the canopy when flying at low altitudes, and they don't know why.

When the fighter was tested in the wind tunnel, von Kármán had personally sat in the fighter to experience it, but he did not find anything abnormal, and the fighter had also undergone several tests on the ground, and only then did it begin to enter the test flight of the actual surname.

But now only the second test flight, high-altitude ventilation is a very serious problem, although the problem is not big, but after a long time, the pilot's body will be frozen, and the huge wind dryness can also make people's emotions begin to become irritable, which will be a huge threat to the pilot.

Therefore, at the beginning of the development of the fighter, von Kármán aimed to reduce noise as much as possible and provide a comfortable and quiet environment for the pilot as much as possible.

"Zhu, come and tell me what it's like."

Looking at Zhu Dazhang who was sitting on the runway resting, Feng Kármán couldn't help it anymore, there was a problem with the fighter, he, the designer, was more nervous than anyone else, others had already developed a new product, and he, a scientific researcher who was listed as a key point by Su Dao, was also willing to give what he wanted, and he never said that he was neglected, but now there is a problem with his product.

In all fairness, von Kármán even felt that Su Dao was too good to him, and he did not urge himself in the research and development, let alone say anything unpleasant, and the fighter could not be put into mass production and installed in the army as soon as possible, and von Kármán himself felt a little sorry for Su Dao.

"When flying at an altitude of less than 10,000 meters, it is very smooth, the fighter is also very stable, and the surname is very good, even if the average novice will not have any difficulty driving it, but the surname of the person above 10,000 meters is a little worse than before, of course, it is still much better than the surname of the Hellcat fighter, and the stable surname is also very good. But the biggest enemy is the temperature, when it reaches 11,000 meters and 300 meters, the ventilation point increases significantly, and the temperature plummets, and the difference between it and 10,000 meters above the air is almost ten degrees. ”

Zhu Dazhang recalled how he felt in the air before, and truthfully said his feelings, and he also knew that now was not the time to worry about face, what problems there were, how many problems he had to tell truthfully, if he had something to hide, then it would be a nightmare for the tens of thousands of pilots who flew it in the future.

"Oh God, are these little black dots a little bit of air?"

Feng Kármán pointed to the mark made by Zhu Dazhang and asked in surprise.

"More than 90 percent of them, some of them I can't be sure, because the time is too short, but I feel that they should be breathable, so I wrote them down."

Zhu Dazhang nodded and said.

"Qian, quickly write down all of this, call everyone over, we will tackle the problem together, and we must solve this problem as soon as possible."

Von Kármán nodded, he was also very helpless about this question, the Hellcat fighters did not have this problem, and they copied it in the way of Hellcat, but the problem appeared, which made Von Kármán very depressed.

"Mr. Carmen, may I interject?"

Su Dao, who had been staying by the side and watching, couldn't help it, although he didn't know what the problem was, but he couldn't bear to see too much, and he also saw more about the cabin covers of those fighters in later generations, and most of them were of which design, if it was adopted, it would be much better.

"Of course, Your Majesty, if you have any good suggestions, we will be glad to do so."

Feng Kármán smiled and nodded, although he didn't think that Su Dao would have any good opinions, but it didn't hurt to listen to it, it was a big deal to waste a few minutes of time.

Su Dao took a piece of paper from the secretary's hand, folded it in half and tore it in half, then folded the two pieces of paper together, and said: "This is our current sealing method, no matter what you do, there are still a lot of connections, so we don't dare to guarantee that there is any unqualified, after all, without a high-altitude test, it is impossible to find these problems, even if it passes the test, but with the future use, we dare not guarantee that the glue fixed on it will not fall off." ”

Looking at Su Dao's explanation, Feng Kármán nodded, Su Dao's words made sense, if Feng Karmen didn't understand this simple truth, then he would be called a real mediocre.

Then Su Dao threw a piece of paper aside, holding only half of the paper just now in his hand, and then folded it slightly, and a bow was displayed in front of everyone's eyes.

"What if so? We can use only one piece of bulletproof glass, stamped and molded at one time, and no longer set up so many frames, which can not only ensure the reduction of air penetration points, but also increase the pilot's field of vision. ”

"Oh God, Your Majesty, you are such a genius that I suddenly found that there is nothing in this world that you do not understand."

Feng Carmen opened his mouth wide, said in surprise, and immediately threw Su Dao aside as if he was crazy, gathered those scientific researchers, and everyone gathered around a table, scribbling on the drawings, and in just a few dozen minutes, a complete hatch cover drawing was drawn.

"Qian, you go and make the finished product yourself according to this drawing, and the rest of the people will push the fighter into the hangar, and I will personally operate on him."

Immediately afterwards, Feng Kármán handed over the drawings to Qian Xuesen, and then he himself said eagerly.

Because the canopy has changed, the original canopy closing system is all scrapped, and they need to put it to rest, and then find a way to fill in the holes, and then install a new set of tracks or something to install the new canopy.

However, this is not difficult for von Kármán, after seeing so many fighters, this problem is really not a difficult matter, and the cabin cover was removed after three times and five divided by two, and even the front windshield was removed, and all of them needed to be replaced with new windshields later.

As for the switch method, it is still the same as before, using the front and rear push-pull type, but it looks much smoother from the outside, and only the connection between the front windshield and the cabin cover in the entire cockpit looks a little problematic, and the rubber is painted silver-gray for closure.

An afternoon passed quickly, Qian Xuesen finally completed the production of the mission, and von Kármán was almost done, after most of the night's fighting, at more than two o'clock in the morning, the transformation of this fighter was finally completed.

Looking at the new fighter and the smoother appearance, von Kármán's heart was very proud, and he was quite satisfied with this modification, all places have been inspected by him, even if there is a problem, von Kármán can quickly solve it, because there are not many places where this kind of cabin cover can have problems, only those few places are prone to problems.

However, the test flight on the third day was what really excited them, with the experience of yesterday's test, the fighter plane flew directly to an altitude of 10,500 meters, and it went very smoothly, Zhu Dazhang did not feel that the wind or dryness increased much, and the most important thing is that the temperature drop was not as obvious as yesterday.

Immediately afterwards, the fighter broke through the altitude of 11,000 meters, and the temperature difference between 10,000 and 500 meters was only about one degree, and then the fighter easily broke through the altitude of 12,000 meters, and the temperature was only reduced by two or three degrees, because this was an environmental factor, and there was no air conditioning inside, so there was no way to solve these.

But a temperature of two or three degrees was not a problem for the pilots at all, but to their great surprise, the fighter did not stop at an altitude of 12,000 meters, but continued to climb.

12,100 meters, the data is normal, the temperature is normal, and the noise in the cabin is under control.

12,200 meters, the data is normal, the temperature is normal.

At 12,500 meters, the data was normal, and the temperature began to drop slightly.

At 12,700 meters, the data began to appear abnormal, the temperature dropped a little, and the outer fuselage began to freeze.

In the end, the height limit of the fighter was determined at an altitude of 12,500 meters, and this altitude was more than 1,100 meters higher than that of the Hellcat fighter.

With the smooth progress of the test flight, on the third day, the fighter tested the range problem again, but the result was still within the acceptable range, with a main fuel tank of 1,200 liters, and the combat radius could be increased to about 1,600 kilometers without using the auxiliary fuel tank, and if it was a cruise, this distance would be increased a lot.

Then I tested a series of problems such as the turning radius, and in the next month, I flew hundreds of times before and after, and many times the pilot here just came down, and after filling up the fuel, I changed to a test pilot and continued to fly, and finally encountered several more serious problems, such as the sudden engine shutdown and so on.

But fortunately, in the end, it was successfully solved, the original plan for a one-month test flight period, and finally after a month and a half of test flights, the test flight task was finally completed, and all the big and small problems were basically solved. (To be continued.) )