Seeing off Captain Li, Wang Dazhi pondered for a while, and went directly to the power laboratory where Viktor Vladimirovich Kapaya was, and when Viktor Vladimirovich Kapaya was almost busy, Wang Dazhi said to him with a smile: "Viktor, delay you a little time?"

Viktor Vladimilovich Kapaya is a smart person, knowing that since Wang Dazhi came to find him on purpose, there must be something very important, he did not hesitate, and nodded happily: "It just so happens that I also want to take a break, why don't we go to the lounge for a cup of coffee and something to eat?"

"It's good for you to drink coffee, I'll still drink tea," Wang Dazhi hurriedly said: "I'm really not used to drinking coffee." ”

Viktor Vladimilovich Kapaya burst out laughing.

After a cup of coffee, Viktor Vladimirovich Kapaya asked Wang Dazhi: "Wang, what question do you want to ask?"

Wang Dazhi did not sell the guanzi, and directly asked Viktor Vladimirovich Kapaja: "That's the case, Victor, do you think that with the current technical level and material level of our COMAC Group, does it have the ability to imitate the helicopter 'aerial crane'?"

"The company is going to imitate the 'aerial crane'?" Viktor Vladimirovich Kapaja was stunned for a moment: "Can the Americans agree?"

Chen Geng helped the Chinese government to introduce "aerial cranes" from the United States, but it has always been talked about in China, and COMAC Group as one of Chen Geng's most important industries in China, everyone is certainly no stranger to this matter, even with everyone on the CH-54/S-64 aircraft performance and main technical indicators, research and development process is a number of treasures, Wang Dazhi is no exception, hearing this, he said: "Sikorsky company' The aerial crane 'heavy helicopter was developed in the late fifties and early sixties, which means that this aircraft has been around for almost 40 years, and the patent protection period is only 20 years, so this aircraft is beyond the patent protection period, and if we copy it, the Americans may not be happy, but from a legal point of view, they can't help it."

Speaking of this, Wang Dazhi looked at Viktor Vladimirovich Kapaja: "So, what I want to know now is, for the current commercial aircraft, do we have the ability to copy the heavy helicopter 'aerial crane', and if so, what are the difficulties?"

Hearing Wang Dazhi say this, Viktor Vladimirovich Kapaya pondered. After a while, he finally raised his head and said to Wang Dazhi: "First of all, let's talk about the materials and manufacturing process of the fuselage, our COMAC Group already has the ability to manufacture a large passenger aircraft like the 100-ton Tu-204, so I think that we have no big problem in the manufacture of the fuselage, and even if there is a problem, I think it is not insurmountable." ”

Wang Dazhi nodded, he thought so too.

Seeing Wang Dazhi nodding, Viktor Vladimilovich Kapaya continued: "I think that if the group really wants to imitate the 'aerial crane', there are three main problems:

The first is the power system, the 'aerial crane' is equipped with two Pratt Whitney company's single turboshaft engine with a power of 4500 shaft horsepower, and in the whole of China, the most powerful turboshaft engine is our group's turboshaft-2000, with a maximum emergency power of 2250 shaft horsepower;

The second is the transmission system, not to mention this, if you want to transmit a total of 9000 shaft horsepower to the main rotor and tail rotor, this has high requirements for the main reducer and tail reducer, and our group currently does not have this level of reducer;

As for the third one, it is the main rotor, the length of the main rotor of the 'aerial crane' is more than 20 meters, and the chord length is more than 60 centimeters, that is to say, it is very difficult to manufacture this rotor, I don't know what unit in your country can manufacture this rotor, you know, I am not an expert in helicopter rotors......"

When Viktor Vladimilovich Kapaya said these problems, Wang Dazhi listened and thought about them, and when Viktor Vladimirovich Kapaya finished speaking, he thought for a moment before he spoke: "Viktor, that's it, about the first point," The aerial crane uses two turboshaft engines with 4500 shaft horsepower, we don't have such a high-power turboshaft engine, go to the Americans to buy it, it is estimated that the Americans will not be able to sell it to us, so can we use a combination of 4 turboshaft-2000 to achieve similar power?"

Wang Dazhi's idea is also simple, since the Z-11 can use one engine, the Z-9 can use two engines, and the Z-8 can use three engines, then it is not impossible for our imitation of the 'aerial crane' to use 4 engines to achieve the same power, right?

"Huh?"

Viktor Vladimirovich Kapaya really didn't think about this possibility, and when he heard this, he was stunned for a moment: Four engines?

But immediately afterwards, Viktor Vladimirovich Kapaya also got serious: since the American CH-53E "Stallion" heavy helicopter can be fitted with 3 engines, then 4 engines...... In addition to testing the designer's design level, theoretically speaking, it seems that it is indeed possible?

Viktor Vladimirovich Kapaya frowned and thought for a long time, and finally gave an answer: "Theoretically, it is possible, but the coordination of the system will be more complicated, but it can also be solved...... But what does the company plan to do about the final reducer?"

Wang Dazhi did not answer, but asked Viktor Vladimilovich Kapaja: "Mr. Victor, if the company really wants to start this project, are you willing to develop this final reducer?"

Viktor Vladimilovich Kapaya is the deputy chief designer of the Mi-26 "Halo" heavy helicopter and the chief designer of the VR-26 final reducer on the Mi-26, so Wang Dazhi thinks that it should not be a big problem to let Viktor Vladimirovich Kapaya develop this final reducer.

At the same time, in order to convince Viktor Vladimirovich Kapaja, Wang Dazhi added: "Victor, you may not know, although for example, the 'aerial crane' is equipped with two 4,500 horsepower turboshaft engines, but the performance of the main reducer of this aircraft is limited, so the total available power is not 9,000 horsepower, limited by the level of metal materials at that time, the transmission system of the 'aerial crane' can only withstand a maximum of 6,600 horsepower, even if it is the last generation of improvements: CH-54B/ The S-64F, the maximum power that the drivetrain can handle is only 7900 horsepower, and I don't think you have a problem developing a more powerful and efficient final drive. ”