Reborn Tech Scholar

Chapter 297 Transport Aircraft Review (22)

Chapter 298 Transport Aircraft Review (2/2)

The strategic transport aircraft is divided into three grades, 600-ton class, 400-ton class, and 200-ton class!

There is only one 600-ton class, and that is the An-225 'Dream' transport aircraft, which has a take-off weight of 640 tons and a load capacity of more than 300 tons.

400吨级的战略运输机有两款，分别是美利坚的C-5‘银河’运输机、安-124。C-5‘银河’运输机最大起飞重量379吨，载重能力达到129.3吨。安-124‘鲁斯兰’运输机最大起飞重量405吨，载重能力达到150吨。

For example, Huaxia's Y-9 transport aircraft is actually not a strategic transport aircraft. Its maximum take-off weight is only 65 tons, and its payload is only 20 tons. It is a medium-sized medium-range transport aircraft with a load of 20 tons.

Huaxia's real strategic transport aircraft is actually only the Y-20, which has a maximum take-off weight of 20 tons and a load capacity of 220 tons.The transport aircraft, which first flew in 60, is not yet in service.

Y-20 is also ill-fated. As early as 1993, Xifei began the preliminary demonstration of large transport aircraft, and invested 30 billion in preparations. In 1997, Xifei proposed to the military a plan to develop a large military transport aircraft. In 2001, it proposed construction. New XAC's strategic plan is to aim at the development and production capacity of 200-ton large-scale aircraft, greatly improve aviation manufacturing technology and processing capabilities, and realize a major leap from 100-ton to 200-ton aircraft development and production.

From the premise demonstration in 1993 to the successful first flight in 2013, the development time of Y-20 has reached 20 years, and the investment in research and development has exceeded 300 billion yuan, and the aeroengine still has to be Russian.

Now the Y-30 transport aircraft produced by Qin Yuanqing is also 200 tons, but the load capacity has been greatly increased, almost double the size of the Y-20, and the range is also doubled, and it is still a model with independent property rights China's transport aircraft, including a series of core technologies such as aero engines, all belong to itself.

要不是战略运输机是分成200吨级、400吨级、600吨级，实际上Y-30划分为三百吨级才是最合适的，而不是和Y-20同属于200吨级。

The aero-engine successfully passed the review, and then came the structural part of the Y-30 transport aircraft, and Qin Yuanqing personally went into battle.

"The Y-30 adopts the conventional layout of a large transport aircraft. The wing is a cantilever upper wing with a leading edge sweep angle of 25 degrees. The NASA winglet is 2.90 meters high and a cantilever T-shaped tail. The connection between the vertical stabilizer and the fuselage is forward. There is a small dorsal fin, the embedded rudder is divided into upper and lower sections, and the elevator is divided into two sections. The vertical tail has a special design, and there is a tunnel-shaped space inside, allowing a maintenance personnel to climb through to carry out the upper Maintenance of the horizontal tail. Hydraulic retractable front three-point landing gear, reliable gravity emergency free release. The front landing gear is double-wheeled, and the main landing gear is 6-wheeled. The front landing gear retracts forward into the fuselage, and the main landing gear rotates 90° It can be used on both paved and unpaved runways. The landing gear is equipped with carbon brakes." Qin Yuanqing pointed to the model of the plane, then turned on the computer, and a very clear three-dimensional map appeared on the computer. and animation simulation.

Compared with the aircraft design in the 20th century, which relied on manual drawing, or computer-aided, manual drawing, the development of industrial software has been very complete, whether it is the calculation of structural mechanics or drawing, it has greatly reduced The workload has improved the research and development progress.

Why in the past, the data involved in aircraft design were several train skins, because there were too many drawings and materials involved in it, but now it is different, the data of several train skins may be 1G or 2G drawings in computer operations .

"If necessary, the Y-30 can make a short-field emergency landing on unrepaired roads. It is for this reason that the landing gear design index is very high, and it is extremely strong and shock-resistant! The main landing gear shock-absorbing strut In addition to the unique oil-pneumatic shock absorber, it also adopts a front and rear double-pillar configuration. Each pillar is equipped with three main wheels. The three main wheels of Zhenzhu will land again." Qin Yuanqing said.

The others gasped, not expecting Y-30 to have such considerations.

Strategic transport aircraft are different from civilian large passenger aircraft. Civilian large passenger aircraft pursue safety, comfort, and economy, while strategic transport aircraft need durability and special environmental requirements on the battlefield.

The reason why the Il-76 and C-17 'Globemaster' are famous all over the world is because these two strategic transport aircraft are very durable, even if there is no runway, they can land in deserts and grasslands in emergencies.

On the battlefield, there is often no time to build a runway, and there is no such condition.

In fact, compared with the original C-17 'Globemaster', the current Y-30 transport aircraft, because the fuselage structure uses a large number of alloy materials and review materials, the weight of the aircraft itself has been reduced by 30%, while the structural strength of the aircraft is much lower. It is much higher.

This is the advantage of latecomers. With the development of the times, materials have made rapid progress, leading to the application of new materials, which can improve the performance of the fuselage. For example, the performance of the landing gear has improved a lot. Increase load capacity.

After Qin Yuanqing's introduction, the experts asked questions one by one. For some simple questions, Qin Yuanqing directly ignored them and asked them to check the calculations by themselves. For some valuable questions, Qin Yuanqing answered them one by one.

The entire fuselage structure review lasted for a whole day, basically focusing on Qin Yuanqing, supplemented by Harbin Institute of Technology and Beihang University.

The latter is the review of the avionics system. In the cabin, three medium-sized LCD displays are spliced ​​together to form a large-scale LCD display. After special algorithm synthesis, the three displays can jointly display large-scale dynamic images. It can be said that this is also the era The advantage of development, after all, at this time, display technology is far from comparable to that in the 80s and 90s, and today's display technology is much more advanced.

And through the integration of computers, one can monitor the dynamics of the aircraft in real time, including engine status, flight speed, etc., and once any part has a problem, it will give a warning as soon as possible.And there is one aspect that is different, that is, the Beidou navigation system is introduced here, and Beidou can be used for navigation.

The computing speed of the shared integrated processor on the Y-20 is 1000 billion times per second, which is also a very big reform and innovation.

Some people may think that 1000 billion times per second is very low, but you must know that this is for military use. All military computer chips have higher technological standards than civilian ones, and even use sapphire substrates.It must be resistant to high temperature, low temperature, rapid temperature changes, and radiation.

Military computers have an obvious feature, that is, durability. Ordinary civilian computers are completely incomparable with military computers.

Otherwise, when the aircraft is flying at a very fast speed at an altitude of [-] meters, its avionics system suddenly crashes, which is simply very fatal.

In this regard, it can be said that it has adopted the most advanced avionics system design in China at present. In terms of avionics system alone, it is a bit higher than that of the fourth-generation aircraft.

In this regard, many experts put forward conservative opinions. For example, regarding the use of displays, they think that mature military displays can be used. Displays like the Y-30 are brand new technologies and cannot be guaranteed in application.

However, Qin Yuanqing argues that if everything is conservative, many new technologies will not be applied and verified, and he will not even have the courage to try, how to promote the development of technology.

The last is the carrying design, the huge space allows the Y-30 to carry two 2 main battle tanks at the same time for battlefield delivery.It can also carry 96 infantry at the same time, and can directly carry out the force projection of two companies.

Moreover, the Y-30 upholds the characteristics of the C-17 'Globemaster', which can simultaneously carry out the loading and unloading of materials in the middle and rear cabins, and various vehicles to be transported by air can be directly driven into the cabin.There is a skydiving hatch on both sides of the tail of the fuselage, and there are two water landing emergency exits on the top of the tail fuselage and the top of the fuselage in front of the wings.

One thing that Y-30 is better than Y-20 is that the engine power is bigger, but the fuel consumption is about the same. The fuel consumption of the original engine is too high, twice that of Y-20.Now, fuel consumption has been reduced through new technologies, making the use cost of Y-30 slightly higher than that of Y-20.

The cost of use is also a cost that the transport aircraft has to consider.

"According to our budget, the cost of each Y-30 is 8 million yuan, or about 1.3 million US dollars!" Regarding the cost of the Y-30, he also gave an estimate.

Y-30 uses many new materials, such as titanium alloy, such as nickel alloy, and many re-checked materials, which makes the cost of Y-30 very high. $17 million is still a lot cheaper.

American products are good, but there is one aspect that is very bad, that is, they are expensive. No matter what the product is, it is quite expensive.

And some products, even if you have money, they will not sell them to you!
这个造价其实和Y-20差不多，因为Y-20采用的是D-30KP2发动机，根据2010年的俄‘土星’发动机公司的采购合同，224台D-30KP2发动机，合计6.57亿美元，平均每台发动机300万美元。而Y-20是需要装备四台D-30KP2发动机，也就是说单单发动机就去掉了1200万美元了。

However, the Y-30 aero engine can be produced by itself, which can reduce the cost invisibly.

Otherwise, according to American standards, the cost of Y-30 is estimated to reach 3-3.5 million US dollars!
At present, the RMB is in the stage of continuous appreciation. Last year, the average exchange rate was 1 RMB per US dollar. In the first half of this year, the exchange rate remained at 6.144 RMB.

However, because Huaxia is accelerating its progress towards mid-to-high-end manufacturing, Huaxia's export volume once again hit a record high, reaching 3.5 million tons, a year-on-year increase of 30%, setting a new historical record.For imported crude oil alone, Huaxia now exceeds 2000 billion U.S. dollars a year.

It can be said that the cost of the Y-30 is absolutely gratifying, and it is within the acceptable range of the Air Force.And everyone knows that with mass production, the cost will drop a lot. After all, once some things are mass-produced, the price will naturally decrease.

(End of this chapter)