Take Off My Aviation Era

However, the central wing box Lin Guanghua took out this time was not a traditional small wing box embedded inside the fuselage, but a top-mounted central wing box placed outside the fuselage.

The advantage of this is that it can ensure the integrity of the cabin to the greatest extent, increase the volume in the cabin, ensure the cargo load, and give more flexibility to transportation tasks.

At the same time, the large overhead central wing box is still the largest fuel tank in the entire aircraft. Because of the overhead, there is no need to consider the structural bearing problem of the entire cabin section as in the past, so it is compared with the traditional embedded central wing. The box can be made bigger.

Although the appearance of the aircraft seems to have a sense of hunchback, the benefits of this hunchback are also obvious. Not only can the wings bear greater external forces, but also the wing The airfoil selection is more flexible and the carrying capacity is greater. In other words, it can increase the fuel capacity of the wing tank.

After such a series of optimizations, even if the take-off weight of the advanced light transport aircraft is the same as that of the Yun-7 and An-26, the fuel load is 1.5 to 2 times that of the first two, coupled with a turbine with a fuel consumption rate of 0.308 kilowatts per hour. Propeller engines, advanced light transport aircraft want to fly to a range of 5,000 kilometers is really not a problem.

just……

"Old Money" Zhuang Jianye closed the car door, then rubbed his somewhat swollen forehead, and said after feeling a little more comfortable, "I understand your mood, but there are some things that can't be rushed, let alone others. During the d-50 test, the overhaul interval is 1,860 hours. Can you guarantee that the delivery to the power plant will be the same as on the test bench?"

"This one……"

Qian Qiang was speechless by Zhuang Jianye. The data on the test bench is true and credible, but the actual application is another matter. Sometimes the situation encountered is not something that the test bench can take care of.

Of course, this is not the most important thing. The key is that the old problem that plagues Tengfei Aerodynamics is still unable to solve the problem. Even if many advanced composite materials are used, there are still various Kaspersky, Qian Qiang and others have not thought of a way to go. To solve it, but after a few attempts, without exception, all were invalid. In the end, I had no choice but to maintain the status quo.

Seeing Qian Qiang not speaking, Zhuang Jianye reached out and patted Qian Qiang’s thin shoulders: "In fact, Lao Lin's side is similar to yours. The overhead central wing box has undeniable benefits. Otherwise, the strategic transport planes of the United States and the Soviet Union will be used. With this structure? But from another point of view, there are no other countries except the United States and the Soviet Union that can make this structure. Why? It's very simple. The first material cannot keep up with the second process."

Qian Qiang frowned. Although helpless, he still admitted that Zhuang Jianye was right. The ceiling-mounted central wing box structure proposed by Lin Guanghua was good, but the idea was the same as Qian Qiang's desire to find a turbine that can withstand 1600 degrees Celsius. Like the temperature of turbine blade materials, there are many insurmountable gaps.

Firstly, the wing box on the top increases the structural weight of the entire aircraft and affects the flight quality and basic performance of the aircraft; secondly, as the most important main bearing structure of the aircraft, the strength of the entire component must be very strong.

When these two points are superimposed, an irreconcilable contradiction arises, that is, how to find an excellent balance point to reduce the weight of the structure while ensuring the strength.

In this regard, the United States and the Soviet Union have found their own methods and applied them to their own strategic transportation. For example, the United States' c5 "Galaxy" and C141 "United Star"; the Soviet Union's An-124 and Il 76 both To varying degrees, the overhead central wing box structure is used.

Even Europe is a bit worse in this regard, not to mention domestically, the gap is even greater.

Under such a big background, even if the Ascendas Aviation Corporation is different, it can't withstand the impact of the general environment. At most, it can only touch the edge of the overhead central wing box technology.

Even though there are already many metal matrix composite materials that can be used on hand, the extremely low production capacity and expensive price are the biggest obstacles to their large-scale use. In addition, a series of processing techniques for new materials also need to be resolved. One of the most important is the vital electron beam welding process.

This welding technology, which is very important in the manufacture of aero engines and aircraft, is currently not available in Ascendas Aviation Manufacturing Corporation. This is why the old problems of Ascendas Aerodynamics engines cannot be solved for a long time, and the top-mounted central wing box cannot be substantive. The main reason for the research.

Because without the intervention of this process, all the beautiful plans of Ascendas Aviation Manufacturing Corporation could not become a reality.

The most important reason why the United States and the Soviet Union can dominate the world in the field of large aircraft is that they have mastered the manufacturing technology of large-scale electron beam welding equipment.

Needless to say, the pinnacle of the Soviet bomber-160 strategic bomber’s wing box was basically welded using large electron beam welding equipment. If it weren’t for this picture, the 160 strategic bomber would never have such an elegant body. Domineering combat power.

"Don't do porcelain work without diamond diamonds. What are we doing now, don't you think those three are not clear? They spend a lot of years in various production plants, researching equipment from other countries, not to mention which experts they are, but they can be regarded as experts. Senior people, they are like a mirror in their hearts. If they don’t click it, it will be considered as a face to us."

Qian Qiang still frowned and groaned, Zhuang Jianye added with a wry smile, Qian Qiang immediately raised his head and looked at Zhuang Jianye depressed: "So, we are at a loss this time?"

"How is it possible?" Zhuang Jianye looked at Qian Qiang in surprise: "Although the investment in the aircraft did not come, but the engine and composite materials can also make pocket money~www.readwn.com~ Qian Qiang was rather disappointed after hearing this. Tone: "That's still a disadvantage. The Navy's An-26 only has fifteen. Alas, it can only be regarded as pocket money. "

...

The pocket money in the mouths of Zhuang Jianye and Qian Qiang fell in the eyes of the navy and aerospace departments, but it was very painful. The d-46ml turboprop engine used in the An-26 modification has the same power and shaft horsepower as the current An-26 The engine is roughly the same, but the unit price is 224 RMB, which is 40% more expensive than the turboprop-5 of the same level.

As for the price of the D-50 for marine gas turbines, it is as high as 3.76 million yuan, which is almost the cost of a small torpedo boat.

The carbon fiber-reinforced aluminum composite materials ordered by the aerospace department are also not so good. The price of 15 thousand yuan per kilogram is 15 million yuan per ton. This price is considered a fixed price among domestic materials. Up.

The two departments said it was fake, but they still gritted their teeth and took out other funds to slam their hands at Ascendas Aviation Corporation.

:. :