Although Zhang Haiping and Song Xinyang left Xifei Group Company, Yang Jie stayed in Xifei Group Company for two more days. Eight] Eight] Reading] Book, .2√3.¢o

The headquarters of Huaxing Group Company and Huake Aviation Technology Co., Ltd. also came to the working group to discuss cooperation with Xifei Group Company, while Yang Jie went to the test flight institute, Northwest University of Aeronautical Technology and many scientific research institutions to investigate.

He didn't want to sit there and intrigue with these officials, just talk about these specific contents, Hu Huanzhi and others.

In the test flight institute of Yanliang District, Yang Jie also inspected the tanker modified with Yun-8K with Zhang Kelong and others.

Yang Jie saw that this Yun-8K tanker, which can carry a maximum of nearly 50 tons of fuel, has three refueling hoses, which are on the left and right wings and tail.

"Chief Master Song, this tanker is also your work, you didn't bother much, right?"

Song Daozheng's hair was completely white, his emaciated face was almost bloodless, and his eyes were sunken and bloodshot, a typical symptom of chronic malnutrition and lack of sleep.

Song Daozheng nodded, "At the beginning, we didn't fully realize the technical difficulty involved. If it is only to transform the interior of the Y-8K into an air tanker, this problem is not very big. However, when flying at high speed in the air, it is necessary to refuel multiple fighters at the same time, which is really a bit technically difficult. There is not enough money to make too many test prototypes......"

Yang Jie frowned when he thought of the wooden prototypes used in the assembly workshop.

This is a matter of no choice, if the funds are sufficient, or the technical strength is stronger, Xifei Group will not adopt such a method.

Fuel is a liquid, and during the flight, it will flow to the low part, which will change the gravity, which has relatively high requirements for the structural design of the entire aircraft, and at the same time, it will have a lot of requirements for the structural strength of the aircraft. +∧ Eight + ∧ Eight + ∧ Reading + ∧ Books, .※.→o

If Xifei Group adopts this method, the progress will naturally be very slow.

"The tanker needs to have a stronger ability to stay in the air and a larger combat radius, and the Y-8K, which can only carry about 40 tons of aviation fuel, is too small. ”

Yang Jie said.

The empty weight of the air tanker itself, if you add a full load of fuel, the fuel consumption is also very large.

"It's better to have this platform than not to have it. ”

Zhang Kelong said: "The military has actually been talking with Da Mao, ready to purchase more than four Il-78mK air tankers from Da Mao, this platform is already very mature, with such a platform our Air Force can master the success of air refueling technology, solve the problem of the Air Force's 'short legs', not only enable the Air Force Aviation to have long-range strike capabilities, but also to achieve the strategic goal from defense to both offensive and defensive types." ”

"Il-78M maximum take-off weight of 210 tons, the maximum transmission of fuel load of about 110 tons, only hose refueling capacity, although this hose refueling system is easy to operate, simple technology, but the speed of refueling is too slow, only for high mobility, less refueling fighter refueling, and only a few, is really a drop in the bucket, or to be able to produce larger fuel capacity of refueling aircraft and hard pipe refueling technology. ”

Yang Jie said.

Zhang Kelong glanced at Yang Jie and said, "What do you think?"

Yang Jie smiled: "In fact, we are imitating the hard pipe refueling system, and we have also developed a set of hard pipe oil port system that is being tested." ”

"Imitation?"

Zhang Kelong was stunned for a few seconds and then suddenly said: "Did you get the hard pipe refueling system technology from the rest country?"

Yang Jie smiled and nodded: "Yes, Huake Aviation Technology Company sent engineers and technicians to Anxiguo two months ago to disassemble and assemble the hard tube refueling system of one of the Kc-747s, and the hardware system of this system can be regarded as a thorough understanding, and then our engineers wrote a set of control systems by themselves, and various technical verification tests can be carried out after the New Year." ”

"In addition, our company is also based on the hard pipe refueling system reverse design of a hard pipe oil port system, I have to say that we still have some talents in Huaxing Group Company. ”

Yang Jie said with a smile.

“......”

Song Daozheng was taken aback.

Hose refueling system is the first to appear, and in the world's major powers are using this air refueling method, the technical structure is simple, easy to disassemble and assemble, each set of devices can transport 1600 liters of fuel per minute, a tanker can be installed several sets, can refuel several aircraft at the same time.

However, this system is affected by the air flow during refueling, and the hose will drift, and the fuel delivery efficiency is low, so it can only be used for fighter refueling.

The hard tube refueling system, the refueling tube is hard, the stability is good, the docking is easy, suitable for any type of aircraft for air refueling, the highest refueling per minute can reach 6500 liters, of course, this system is also a complex technical structure, and at the same time can only be refueled by one oil receiving machine, mainly used for large air tankers, mastering this set of technology at this stage is only country A.

Typically, the highest efficiency is achieved when two refueling systems are mixed on a dispenser.

In fact, Xifei Group Co., Ltd. also imitated the hard pipe refueling system through secret channels, but the problem is that China could not make such a high-pressure oil pump with such a large pressure before.

The maximum average refueling rate of hard tube refueling can reach 6,000 liters per minute at this stage - that is, 5.1 tons of fuel can be transmitted in one minute, even if it is a heavy fighter like the Su-27, plus the overloaded fuel tank, if it is fully filled at this speed, it is less than two minutes.

This particularly high fuel transfer rate, as well as the telescopic tubing construction, also brings a problem that hose refueling does not have – severe vibration and shock.

Liquids are very difficult to compress, and in the process of fuel transmission, the huge flow of fuel, the flow of high-pressure fuel, the start and termination, especially the forcible termination in the emergency state, will form a serious impact, prompting the telescopic rod to form violent vibrations and impacts.

Song Daozheng was developing it before, because the materials were not up to standard, and as a result, when the fuel was filled, there was a shrinkage part of the hard rod, which was directly blown away by this hydraulic hammer effect.

It was this incident that made the military directly give up the research and development of the hard pipe refueling system.

Think about a lot of domestic surveying and mapping work, are because there is no suitable high-precision measurement equipment and can not be done, some of the core components through special channels once disassembled, can not be installed back at all, if replaced with domestic components, there will be various failures.

However, Huaxing Group Company's Machine Tool Research Institute is the first scientific research institution to master the design and production of ultra-precision machining equipment, some precision equipment of Xifei Group Company need to be purchased from the Machine Tool Research Institute, Huaxing Group Company has such a strong strength in material research and development and material processing equipment development, Song Daozheng also believes that Huaxing Group can completely solve the technical problems of hard pipe refueling system. 11