Minus. It turned out to be Wen Mo Hui Lan nodded, understood! If you're busy, you're going to do it anyway, so let's make it bigger. The most important thing in my hands is the technology in aircraft design, since this is the case, what else do I have to worry about? It doesn't matter if you take a big step!

"Well, there's no problem with the various composite materials and alloys used in the aircraft, right?" Zhang Lan scratched her head, the material problem is a big problem, "I mean mass production.

After asking, I immediately felt that what I asked was obviously redundant: material problems? What a big deal this is, there are a group of people in Brother Tian, will this, things become a problem for aircraft manufacturing? Rather than worrying about this problem, it is better to worry about the machining accuracy of various parts on the aircraft at that time, not to mention the accumulation of technology over the years, and the establishment of research institutions one by one. But it's not pretty.

Well, it would be nice if there was a large-scale low-cost refining technology, anyway, the content of the narrow on the earth is quite high, the only problem is the difficulty of refining, as long as it can be refined on a large scale, the price will naturally come down. Some shameless bastard is quite greedy and insufficient.

Obviously, Xiao Chenxi also knew how to express this question, and the little girl shook her head and smiled, and did not answer this question, "Let's talk about your request first?" What are you going to design this helicopter to look like? ”

"Tiltrotors, of course!" Zhang Lan did not hesitate at all about the answer to this question: this question has been considered for a long time, and this guy has already made plans for the next aircraft production plan.

The helicopter design methods that are now popular in the world can be broadly divided into two types. One is the traditional single-rotor and tail rotor layout, and the other is the dual-rotor layout, and there are currently three ways of dual-rotor layout: longitudinal twin-rotor, transverse twin-rotor and coaxial twin-rotor.

These kinds of aerodynamic years can be regarded as their own characteristics, the traditional design of course has the benefits of traditional design, the existing helicopter with the largest take-off weight in the world, such as the Americans' fierce "super stallion small." The two world's most famous heavy-duty helicopters, the heavy-duty helicopter and Lao Maozi's "Halo" super heavy-duty helicopter, are all based on the traditional single-rotor aerodynamic layout structure. There is no other reason. This pneumatic layout is the most technologically mature.

But the single rotor has the advantages of a single rotor, naturally there are also disadvantages, at least with the increase in the tonnage of the helicopter, the number and length of the main rotor of the helicopter is rising in a straight line, for example, the rotor diameter of the "halo" super heavy helicopter has reached an amazing ugly meter, and the air flow set off during take-off and landing is no less than a violent wind.

However, the helicopter with the largest take-off weight that has been built in the world is the Yoneguchi Super Helicopter with a horizontal twin-rotor structure! The maximum take-off weight of Qiaoton is not a joke, although this technical demonstrator has various hairs such as inconvenient piloting and poor maneuverability.

But this does not cause dissatisfaction with the twin-rotor aerodynamic layout helicopter, this is not the fault of the aircraft technology itself, the reason why the Mikou helicopter was not adopted by the former Soviet Union at the beginning, the most fundamental reason is only because of its own technical conditions, the former Soviet Union was not advanced enough in the technology of the horizontal twin-rotor helicopter, otherwise why is it basically the same period as the old Maozi's Mi 1 Cai Huang Row twin-rotor helicopter in the same period of the Americans' fierce "Chinoo is small." Can a horizontal twin-rotor helicopter shine on the world helicopter stage?

There is also a disturbing point: although the payload of such super-fierce aircraft as the Miide "Halo" super heavy helicopter can already be as large as that of the 1-blade "Hercules". The transport capacity of such medium tactical transport aircraft is comparable, but their maximum cruising speed of less than 1 kilometre and the maximum range of less than 1 kilometre when fully loaded is really a headache: if only these guys could be a little faster and have a longer range.

The range and speed of traditional helicopters have made the military of various countries scratch their heads. Of course! What the? That is naturally similar to the success of the American Net's research for a short time. The "Osprey" tiltrotor aircraft, a helicopter with a new structure, can not only take off and land vertically like a helicopter, but also fly at a higher speed like a fixed-wing aircraft, obtaining a larger range and higher flight speed.

Relative to conventional helicopters. Five "ospreys." The tiltrotor plane's speed and range that are almost the same as Tian's "Hercules" neutral tactical transport plane really make the US side love it to death while seeing its shortcomings.

In a way. The tiltrotor has actually broken through the category of traditional helicopters, and can be seen as a hybrid of traditional rotary-wing helicopters and fixed-wing aircraft, although this new structure of the helicopter is still a lot of problems, and it is almost a long time in the future for a long time to develop a multi-purpose helicopter, "The new structure of the helicopter is twice as fast as the traditional helicopter and has a range of at least 4 times that of them, which is almost revolutionary for the helicopter."

The only problem is that this structure is too complicated, even the world's most technologically advanced technology and technology Lao Mei has not completely solved it, but this is not a problem for Xiao Chenxi and them at all.

"Tiltrotors? Is it similar to the American kind of tiltrotor? Xiao Chenxi turned her head and asked, the sunglasses on her face and Bai Zhe's face swaying in the sun Zhang Lan was dizzy for a while, "This is quite a good pneumatic structure." ”

Although this kind of structure is still not very eye-catching, but in combination with the existing technical level on the earth, this structure is already quite satisfactory, and even after optimizing the design of the wing and installing armor, it is qualified to be used as a battlefield attack aircraft, anyway, the attack aircraft generally does not need to fly too fast, right? As long as the bomb load is large and the skin is rough and the flesh is thick.

"It's just that I think. The rotor of the blade is too long, if it is convenient to use the kind of pulp fan engine on the Anli transport aircraft, the question is whether the opposite propeller fan on the paddle fan engine can meet the energy requirements of the helicopter during vertical take-off and landing? Xiao Chenxi, who was thinking about all this, didn't notice Zhang Lan's pig brother-like. lazily consulted Zhang Lan's opinion.

Small? 2. The blade diameter of the turbofan engine used on the "Osprey" tiltrotor is 11 meters, while the diameter of the anti-propeller fan of the Anli transport aircraft is only 44 meters. ,

Having said that, this is not Zhang Lan's suspicion of the advanced nature of the pulp fan engine, there is really no mass-produced aircraft in the world that uses the pulp fan engine, if he uses the pulp fan engine this time, it can be regarded as a precedent, the reason why there is such a question, purely because Zhang Lan, this little bastard is not an aircraft designer, intuitively will see the energy provided by the huge rotor of the helicopter and the energy provided by the pulp fan engine instinctively compared: can the victory provided between the two be equated?

This bastard forgot that the paddle fan engine used on the Anjian transport aircraft has old blades, and the shape of the blades is also a large wing surface and large inclination blade that can maximize the performance of the propellers, compared with the long main rotor of the traditional helicopter, the energy provided is actually not much worse, and there is no aircraft with a pulp fan engine in the world, not that this engine is not good, but it is really limited by the technology of this type of engine.

This is the biggest technical challenge for Zhang Lan since he was reborn, and there are always examples to follow for what he wanted to do before, but this time he really started from scratch.

"Pulp fan engine?" Xiao Chenxi was stunned for a moment, "What kind of load capacity do you plan to build?" But then again. The propulsion efficiency of the fan engine is indeed much higher than that of the traditional turboshaft engine and turboprop engine. ”

"And Americans'. It's about the same load capacity, right? "Zhang Lan's requirements are not high, this guy smashes his mouth, he looks very low-key, "It's okay to be a little bigger, the step is too big, I'm still a little worried that others can't accept it, and I doubt the quality of our products."

This is true, the load capacity of the helicopter is not simply to increase the number of engines, which involves a series of problems, is a systematic engineering, with the commission of the load capacity, the difficulty of development is also geometrically rising. Otherwise, why has China mastered the technology of the Yun-8 heavy transport aircraft for so many years, but why has it not been able to build its own large aircraft with a maximum take-off weight of more than a heart ton?

"Is there a load capacity around Xintun? Xiao Chenxi nodded, and muttered about it, "That is equivalent to a medium-sized transport plane, which is at the same level as Chou, Black Hawk and Mimoto." Such a medium helicopter is really the most versatile. ”

Of course, there are all kinds of helicopters in the world, and in terms of use, this medium-sized helicopter has a wide range of uses, covering plateau transportation, life-saving, marine monitoring, emergency rescue, forest fire prevention, and military operations and so on. Not only foreign countries, but also the most equipped in China are also the Zhi-8, Mi-1 and Mi-class medium-sized helicopters, and the HNA uses the Zhi-9 light helicopter, which is really no way.

"There is no problem in technology," Xiao Chenxi finally nodded after careful calculation, "The tonnage is not large, and the energy provided by the two rotors with a true diameter of 4 meters is enough for the rotary fan engine."