The maximum thrust of 250KN has been achieved, but the latest engine full power digital control system has not been installed and tested? Nie Guang's answer made many people in the conference room very excited!

Under the premise that Nie Guang has previously stated that the full digital control of the engine is realized on the current RB211 engine and the "tay" series engine, it is not only a matter of time to realize the full digital control of the engine on the new 250KN RB211 engine?

Li Jun, the boss of the sales company, hurriedly asked: "How long will it take to complete the full digitization of this engine?"

"About a year," Nie Guang replied: "For now, the full digital control system of this engine is already very stable and reliable, and the next time is mainly to match and re-certify the two." ”

The plane flies in the sky, so any improvement of the aircraft or aero engine needs to be re-evidenced, which everyone understands, so everyone is very satisfied with Nie Guang's statement, especially Li Jun, who nodded happily: "Great, great." ”

But some people also questioned: "But the thrust of 250KN still can't meet the power needs of our new generation of large wide-body passenger aircraft, right? If I'm not mistaken, the thrust of the Boeing 767 is 250KN." ”

Compared with the Boeing 777, McDonnell Douglas MD-11 and Airbus A330, the Boeing 767 is a "small man" among the large wide-body passenger aircraft.

"This question can be answered by colleagues from the Design and Research Institute," Nie Guang bowed slightly, and said: "I want to talk about the second step of the new generation of RB211: a model of the 300KN thrust level, at present, the progress of the new RB211 engine with this thrust is quite smooth, and our goal is to come up with a prototype within 5 years." ”

It will take at least 5 years for the engine branch to come up with an engine with a thrust of 300KN?

Hearing Nie Guang's words, everyone's eyes suddenly fell on Fang Zhiqiang, the person in charge of the Design and Research Institute, and everyone wanted to see how Fang Zhiqiang, a clever woman, could cook a meal that could make the whole family eat enough when there was not enough rice.

Facing everyone's eyes, Fang Zhiqiang slowly spoke: "Comrades, don't hide it from you, before that, we had worked with Pratt Whitney, Rawls· Royce and GE communicated, but GE refused to provide us with their latest GE90 engines, only the previous generation CF6, and not the CF6-80CG2 with a maximum thrust of 290KN, but the CF6-C2B4 with a thrust of only 258KN, not only that, but the price was more than 30% more expensive than the price offered to Boeing, McDonnell Douglas and Airbus, and the situation was similar for Rolls-Royce and Pratt Whitney.

Of course, this is when our 250KN thrust engine is still in the stage of strict secrecy, and if we had announced the news that our 250KN thrust engine has been successfully developed, I believe that the result may be slightly different......"

No one spoke, and everyone was already surprised by this situation.

You ask why they don't sell us the best, and what they sell to us is not only a generation behind, but also expensive? Because this is the regular practice of these enterprises: since you can't produce it, then you are begging me, since you are begging me, how can you do me if you don't kill you fiercely?

However, if the news that COMAC can produce its own 250KN thrust engines spreads, not only will the price of 250KN engines be reduced immediately, but also 270KN to 290KN thrust engines can be sold to COMAC......

"But for COMAC, large wide-body must be developed, in the words of Chen Dong, that is, 'COMAC Group can't always only make small aircraft'!" Fang Zhiqiang continued: "The engine is of course very important, but in the case of insufficient thrust of the engine, whether there is a way to meet the initial design requirements of range and passenger capacity, this is not impossible, such as the previous 'short fuselage incomplete body' is a way."

However, after comprehensive discussions, our design and research institute felt that this method was not advisable, and in the case of insufficient thrust, using the method of shortening the fuselage to achieve the goal of range would only make competitors attack and laugh at us, so our design and research institute's idea was to think of a way to reduce the cruising speed a little bit in terms of the wing. ”

Think of a way to reduce the cruising speed at the same time in terms of the wings?

That's right!

All of you who are doing it, even if it is a sales company, even if it is in charge of administration, but after all, you are a person in this industry, and you can be regarded as half an expert in aircraft, as soon as Fang Zhiqiang's words came out, everyone immediately understood what the design and research institute planned to do: adopt a more efficient airfoil, and at the same time increase the wing area!

The increase in the wing area will provide greater lift, so that the thrust required by the aircraft will be relatively reduced, such as the glider, because the wing area is huge, the lift that can be provided is greater, so even if it is an unpowered glider, it can also achieve a 20:1 glide ratio, that is, in the case of smooth airflow, the aircraft will only drop 1 meter per 20 meters of height, and if it is a powered glider, it only needs a small amount of power to make the aircraft stable in the air and maintain altitude.

As for reducing the cruising speed, it is also a good way to reduce the requirements for the engine, for example, the cruising speed of the Boeing 777 is 895 kilometers per hour, while the cruising speed of the Airbus A330 is 872 kilometers per hour, and the cruising speed of the Boeing 767 is only 850 kilometers per hour, and the total thrust of these three aircraft is descending in steps, even if the Boeing 777 is compared with the Airbus A330, the difference in thrust is also very large, except for the total thrust of the first generation of Boeing 777-200 is 660KN, and the total thrust of the Boeing 777 after that is more than 800KN, while the total thrust of the Airbus A330 has never exceeded 660KN.

"Can the 250KN meet the original design requirements?" Li Jun immediately asked: "In addition, how much can the maximum cruise speed reach? Can it reach 850 kilometers per hour?"

"No," Fang Zhiqiang shook his head: "The result of our calculation is 820 kilometers per hour." ”

Is it only 820 km/h?

Hearing Fang Zhiqiang's words, everyone frowned in unison: To tell the truth, the cruising speed of 820 kilometers per hour is indeed not slow, and the cruising speed of the current Boeing 737-300 is only 780 kilometers per hour, but the problem is that the gap between this speed and competitors is still a bit big, for example, compared with the Boeing 777, the speed is 75 kilometers per hour lower, which means that when performing the transpacific route flight mission, the flight time will increase by more than an hour.

It's more than an hour, which is not a small amount for an airline that places a high value on efficiency.

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PS: Children's Day is here, happy holidays, all lovely big friends and children.