Not only Li Fang, but Song Changzheng also looked at Qian Qiang with wide eyes, but after all, he was older than Li Fang and had more experience, so he was not as surprised as Li Fang performed, but asked, "Is it a theoretical value, or an actual value?"

"What is the theoretical value and the actual value?" Qian Qiang looked at Song Changzheng very puzzled, "The gas turbine power of our Tengfei Aviation Power is made according to the actual use, through real tests again and again, compared with the United States General Motors, Pratt & Whitney, Honeywell and other aviation power manufacturers often have a 3,000-hour overhaul interval, 7,000 to 10,000 hours of service life, our D series is indeed not as good as the performance of others, which we admit, and are actively seeking solutions." ”

Said and sighed, "At present, our Tengfei aviation power has basically met the requirements of the use of small gas turbine power units in terms of materials, but there is still a big gap in the processing technology, and it is not the application of a series of new materials, we have not yet mastered it well, especially in finishing and welding, the traditional aero engine process is not suitable for this kind of new materials."

Take the welding process as an example, the United States, the United Kingdom, these developed countries they use the electron beam welding process on the key components of the aero engine, not only the flatness is good and not easy to deform under high temperature and high pressure, the current Honeywell engine used on the Yun-6 transport aircraft, there are many components using this process, but we know that there are welds in some places, but after dismantling it, we can't find where the weld is, this is the gap, and the finishing ......"

When it comes to his own profession, Qian Qiang once again opened his chatterbox, and Balabala said a lot, all of which are the deficiencies of the D series turbo gas power, what are the reasons for these deficiencies, and what should be made up for them.

All in all, in a word, the 1-hour overhaul interval of D series turbo gas power, the service life of 6 hours is really poor, I don't believe you look at similar products in the United States, how can you be proud, how can you expand? Is it time to celebrate victory?

Li Fang and Song Changzheng were both stunned, not stunned, but really stunned.

1 hour overhaul interval, 6 hours of service life is not too high?

You must know that the turboprop-6 overhaul interval on the Yun-8 is less than 1,000 hours, which is still the usual maintenance of the pilot, the pilot did not have any brutal piloting, a little accident, five or six hundred hours to replace the overhaul is not impossible.

In fact, not only the turboprop-6, but also the overhaul interval of the engines of other models is generally not high, which is why Song Changzheng will ask whether it is a theoretical situation or a practical situation.

Because the theoretical value of the engines produced by the domestic power production plants is good, but the actual use of the troops is a different scene, but it cannot be said that the manufacturers are wrong, because the test data is taken as an average value, and the data is good-looking.

This is just like the average fuel consumption of cars announced by the Ministry of Industry and Information Technology, how to look at how reasonable, how to look beautiful, but when you get started, tired vomiting blood can not reach the fuel consumption value announced by others.

The naval aviation unit to which the navy belongs has encountered the same problem as private car owners decades later, and the theoretical value is so different from the actual value that the officers and men of the ground maintenance unit feel that if the engine can have a 1,000-hour overhaul interval, they will be thankful.

But people take off aviation power, the overhaul interval of 1 hour, close to 7,000 hours of service life, is still said to be not excellent, the gap is big, if this is heard by other aero engine manufacturers in the country, what will it be like? Will the old face be red in minutes and go straight to the crack in the ground to hide for a while?

"Old money, old money~~~"

Seeing the appearance of Li Fang and Song Changzheng gradually petrified, Zhuang Jianye hurriedly stopped Qian Qiang, who was still talking, Qian Qiang was stunned for a moment, he didn't know what Zhuang Jianye meant, Zhuang Jianye also knew that Qian Qiang was not very good at this, so he raised his chin at the filing cabinet next to him, "Show the two thousand hours of test briefing on the D-50 that is being tested some time ago to several leaders." ”

Qian Qiang narrowed his eyes when he heard this, and then suddenly he felt that he had said so much, and the two naval chiefs in front of him didn't believe it, and they didn't say anything, so they came to the filing cabinet on the side, took out a D-50 test briefing from it, turned around and handed it to Li Fang.

Li Fang took it into his hand, and then looked at Qian Qiang, who was expressionless, "Qian Gong, isn't the D-50 on the test bench doing a 100-hour phased test run?"

If this is someone else, it is estimated that I don't quite understand the meaning of Li Fang's words, 100 hours of phased test generally refers to the first stage of the newly assembled ignition turbine power long test, mainly to check its basic working conditions, so Li Fang's words translated is, the test bench on the D-50 is not assembled?

Others don't understand, but Qian Qiang, who is engaged in this piece, doesn't understand, shook his head, "I have done two two thousand hours of long test, three days ago just finished the overhaul, do two stages of phased test, start the next long test, followed by the freezing test, rain test, bird impact test, foreign body inhalation test, all passed, is the last 10,000 hours of long life test." ”

"Have you done two long test drives of 2,000 hours?" Li Fang only felt that the long test briefing in his hand suddenly became very heavy, and he almost didn't hold it and fell to the ground.

Qian Qiang wanted to say very much, otherwise how do you think the 1860-hour overhaul interval came out? But after all, it was estimated that the other party was the head of the navy, and he did not say it explicitly, but smiled and pointed to the long test briefing in his hand, signaling himself to look at it.

Li Fang hurriedly flipped it over, and Song Changzheng on the side also came over to look at it together, but the more the two looked at it, the more shocked they became, the D-50 that was roaring on the test platform not only completed two long tests of 2,000 hours, but more precisely, three times, but the third time did not reach 2,000 hours, only 1880 hours.

The reason for this is mainly to determine the interval between overhauls of D-50 under normal conditions based on the first two 2,000-hour long test runs.

No wonder Qian Qiang said just now that he was so confident when he was in 1860 hours, it turned out that people had already done three tests of such a changed ~~ state.

Now Li Fang and Song Changzheng look at the test bench on the test bench is running madly at 3,000 kilowatts of power D-50 is a little different, according to the previous number of hours, the D-50 that is being tested should be about to reach the end of its service life, from the perspective of operation, there is no difference with the new engine, and even better in some aspects.

What would it look like if such power was installed in an airplane?

So Li Fang and Song Changzheng glanced at each other again, and quickly understood the same idea from each other's eyes, and then Song Changzheng looked at Zhuang Jianye without hesitation, and said solemnly, "Mr. Zhuang, we will make a special report to the Navy Headquarters after we go back, and strive to join the D-50 project, I don't know what opinions you have here?"

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