Yang Hui told Shi Ping the opinion of the base, and Shi Ping also tried his best to help convey the meaning of the base, as for whether there can be cooperation, this is not up to Shi Ping to say.

After Shi Ping conveyed his meaning, there was soon definite news from Hongdu.

Hongdu said that cooperation can be carried out on the new primary training aircraft, and it can also be negotiated on the Yangtze River 750 motorcycle engine.

These Yang Hui had already predicted that as long as there was nothing wrong with the high-level of Hongdu's brains about the training plane, there would be no reason to refuse to cooperate at all. In the eighty-third year, the factory that produced the Yangtze River 750 motorcycle was not only Hongdu, but also several factories in the whole republic.

The most important thing is that at this time, the capital of Guizhou Province, where the 0011 base is located, is also beginning to introduce the whole machine technology of 750, and even Yang Hui remembers that the 0011 base also introduced this 750 for production in the previous life.

As the first factory to produce 750, Hongdu knew that the Ministry of Industry above was playing 750 ideas. Rather than waiting for the administrative order of the Ministry of Industry above to forcibly take away the 750 technology, it is better to take out the 750 at this time to accept personal favors, and maybe you can make a few small bucks.

After Shiping and the base negotiated the merger of the new primary training aircraft, he left the base and returned to Hongdu to continue the design of his new primary training aircraft.

In the previous life, Hongdu K8 was accelerated after the negotiation with Pakistan in 86, and now it is different, this is 83 years, and the time is three years in advance.

At the same time, under Yang Hui's suggestion, not only listed the technology introduced by the later K8 in advance, including the engine suitable for the small thrust of the new aircraft, but also gave the engine equipped with the later K8.

"Team Leader Shi, I hope you can carefully consider these suggestions, especially the engine selection of the new machine. The TFE7-31 is a very good engine, with a thrust range of 1.5 to 2 tons and low fuel consumption. ”

I don't know why Yang Hui has always been so interested in this TFE7-31, and he has repeated it several times. Shi Ping was interested in this engine and decided to take this engine into account in the design of the new training aircraft.

As for why Yang Hui has always been concerned about this engine. Naturally, there is a reason for Yang Hui. This engine was developed by the American company Garrett and was developed to meet the needs of jet executive aircraft in the seventies and eighties. The engine is quiet, excellent performance, economy and safety are quite reliable.

The most important thing is that this engine has a high channel ratio, and the most important thing is that this engine uses a gear transmission scheme, which is the most attractive point to Yang Hui.

What exactly is a gear drive? This brings us to the history of aero engine development.

From the earliest centrifugal engines. Evolved into axial engines. The axial engine transmission relies on a long shaft, one end is connected to a high-temperature power turbine, and the other end is connected to a compressor, so that it constitutes a first-stage rotor.

In the early days, turbo engines were single-rotor engines, and later they were developed to improve performance. It was found that if the compressor of the turbojet engine can achieve differential operation, so that the speed of the compressor at all levels is different, so as to adapt to the working environment of different compressors, then the engine will have better performance.

Under this requirement, there is a twin-rotor engine, and even a more powerful and complex three-rotor engine, and the more engine rotors can naturally achieve different speeds between different compressors.

But there is a big problem with multi-rotor engines: because they are multi-rotor engines, they naturally have one shaft in the other. Not only is this a great difficulty in manufacturing, but the transmission efficiency is not very good.

At this time, there is another transmission concept: gear transmission. With planetary gearing, only one shaft is required. Through the planetary gear reduction transmission, the compressor at all levels can work at the most suitable speed. And the gear ratio of the gear transmission can be adjusted differently according to different needs, which is where the gear engine is awesome.

Gear transmission is quite awesome, but in the early selection of engine transmission programs in various countries, it was defeated by the multi-rotor program, which has to mention the hard damage of this gear transmission: the ultra-high speed of the aero engine makes the pinion of the planetary gear have to rotate at the same speed, so how to solve the heating at the high speed of the planetary gear? And to ensure the safe and long-term operation of the gears at high speeds?

Although these problems are hard injuries, but the powerful efficiency of gear transmission is also coveted, Yang Hui from later generations, naturally know a lot about the future of gear transmission this program.

How can gearing fight back in the 21st century? This data alone is not convincing, so let's give an example to illustrate.

In the future, gear transmission is not counted as large-scale use. Because in later generations, the gear transmission scheme was only used on the new generation of commercial engines of Pratt & Whitney in the United States, but such an engine received an unprecedented response from the market.

This awesome geared engine has not even been mass-produced, Pratt & Whitney set out to arrange a series of engines. That is, the Jingjie power series engine developed by Pratt & Whitney.

The engine series was named one of the 50 greatest inventions of 2011 and described it as "the most significant development in aviation in 2011".

The new clean power engine is environmentally friendly and noise reduction. It has directly set a new standard for the industry, and its noise level has been reduced by 50% compared to other similar engines, which is definitely a remarkable improvement for passenger aircraft in the new century.

Not only does it have excellent performance in noise reduction, but it also has an extraordinary enhancement in fuel consumption, and the new Jingjie power engine directly reduces fuel efficiency by double digits in fuel consumption. Emissions have also fallen by double digits.

Of course, these awesome data have the reason for Pratt & Whitney's many years of experience in producing aero engines, but the biggest credit still depends on the awesome technology of gear transmission, otherwise why are the engines of Rolls-Royce, GM and CFM, which are also powerful in technology, so awesome.

In order to achieve a counterattack, the Republic of Aero Engine must now press the treasure to the same gear transmission that is not yet welcomed, and only the joint efforts of the brothers and sisters can achieve a counterattack, and the engine that plays the traditional structure behind the international giants will always have to eat ashes.

Now there is an opportunity to come into contact with a geared engine that has been put into use, which has to attract Yang Hui's attention.

At this time, Garrett was not a super crocodile like Pratt & Whitney, GM, and Rolls-Royce. It's more likely that you want to cooperate.

Although Garrett is an American company, it can still make a fuss with the help of the good relations between the Republic and the United States.

The United States was the most open to the Republic in the 80s, although it was still very tight on high-thrust engines, and did not even give export finished products, but it was much more relaxed on medium-thrust engines.

You don't see how fierce the F404, PW1120, and RB199 played in the super seven projects in the previous life.

The medium-thrust engine has been released for sale of finished products, so what else is there to say about the small-thrust engine, Garrett is not a first-line main engine supplier in the United States, and it is still possible to introduce this small-thrust commercial engine.

Shi Ping didn't know these thoughts in Yang Hui's heart, but he still answered Yang Hui's words affirmatively.

"Don't worry, I'll definitely study this engine when I go back, if it's really good, I will naturally recommend this engine to the institute, you should want to introduce it so much, right?"

In Shi Ping's words, Yang Hui has nothing to hide, and he generously admits that it is: "That's right, I am indeed optimistic about this engine, of course, the most important thing is that I am also more optimistic about our new primary training aircraft, so this engine was introduced, and now our domestic small thrust engine is indeed not very good." ”

Yang Hui's frank confession made Shi Ping very happy, patted Yang Hui on the shoulder and got into the car to leave.

Seeing Shi Ping leave, Yang Hui also turned around and walked to the base, as for whether the new primary training aircraft engine will be selected Yang Hui is not worried, K8 chose this engine at the earliest in his previous life, and of course there will be no problems in this life. (To be continued.) )