Chapter 514 A helicopter that is too quiet? (page 1)

While Chang Haonan was intensively conducting technical tests on the turbofan 9A, other units within the aviation industry system were naturally not idle either.

Especially Bingcheng Aircraft Industry Group.

Since the core power and transmission mechanism of the helicopter have been improved before, the development of the Z-9 assault transport type was much smoother than initially expected.

Liu Hongbo, who traveled between the two places to personally "supervise the war", first determined the noise calculation method of the flow field-sound field with Chang Haonan, and he seemed to have a good understanding of this aspect, and soon began to take charge of his own business.

In less than three months, the previous semi-finished aircraft, which was about 9% completed, was refurbished and became the first prototype of Zhi-WY (Armed-Transport).

The only problem is the test flight.

Originally, China's helicopter test flight process was relatively chaotic.

Due to the huge differences in engineering principles and research and development methods between fixed-wing and helicopters, generally speaking, the proportion of tasks undertaken by test flight bases during helicopter test flights is relatively low.

Most of the test flight work will be done locally at the manufacturer.

Even the specific subjects of each OEM are not exactly the same.

Fortunately, the flying environment of helicopters is relatively simple after all, so it has not been a big problem over the years.

However, the situation of Zhi9WY is rather special.

It rolled off the production line in mid-January.

At that time, the temperature in Ice City was almost minus 30C.

This temperature is a test for the mechanical parameters of the engine, especially the turboshaft engine, the stability of fuel and oil delivery, and even the pilot himself -

The cabin of a helicopter is only as airtight as a car, not as good as a fixed wing.

Moreover, the operational feedback presented by the helicopter at low temperatures is also very different from normal conditions.

Especially during take-off and landing where the risk factor is highest.

If the pilot's proficiency is low, it will be difficult to save the situation once some emergencies occur.

In short, under normal circumstances, helicopters only choose some extreme climates according to actual needs in the middle and later stages of test flights to complete tests in special environments such as alpine/plateau/salt spray.

Although the trend of reconstructing the national military standards set off by Chang Haonan has had little impact on the helicopter industry, even if there are no relevant standards, the first flight in the extremely cold climate of minus 30 degrees Celsius is obviously dancing on the coffin board of aviation safety regulations.

But Bingcheng Industrial Group obviously cannot be willing to postpone the first flight to April or May.

That's three or four months wasted.

As Chang Haonan becomes more and more involved in the research and development of aviation industry projects, the industry's understanding of "work efficiency" has also undergone earth-shaking changes.

In the past, the research and development cycle for a "major revision" model such as Zhi 9WY was basically calculated in units of 10 years.

Due to limited objective conditions, it is normal to wait for several months.

But now, this can only be regarded as minor repairs based on the existing mature design. Everyone subconsciously feels that it should have been completed in two or three years.

In this case, delaying for several months would be a heinous crime.

In the end, Bingcheng Industrial Group worked hard and chartered an An-124 from the Volga-Dnepr Company, including the prototype with the main rotor removed, all related auxiliary equipment that needed to be tested, and the personnel involved in the test flight mission. Pulled in Ho Kyung.

Therefore, the entire test flight process of this aircraft born in Ice City will be completed in a foreign land 2000 kilometers away.

……

A huge An-124 landed in Haojing, and the noise was naturally not small.

It can be seen almost all over the city.

Not to mention internal units such as the Flight Test Institute or Haofei Group.

Most people, even those who are involved in aviation, have never seen such a big thing with a take-off weight of 400 tons.

尤其跟停在跑道附近的几架运5、波音737、运7、新舟60以及歼轰7A原型机一比，更是尤其明显。

Discussing and laughing at other small planes.jpg

Therefore, during the process of unloading the prototype from the warehouse, it was already watched intensively by curious colleagues and wall-crawlers.

Guo Jingshan and Liu Hongbo didn't care.

When they chose to charter an An-124, they considered that this way of appearing would be very eye-catching.

It is only required that onlookers be excluded from the airport area to avoid causing any security problems.

After all, as the basic type of Zhi 9WY for export, there is not much need for confidentiality.

The prototype is a dolphin sold almost all over the world by the French. You can get up close and personal with it for hundreds or thousands of francs in Europe.

Although some key improvements, such as the transmission system, engine, and rotor, are independent intellectual property rights, it is not something you can just take a look at. Even if you are given a measuring tape to measure, you cannot simply copy it away.

Among other things, the low-noise propeller designed by Liu Hongbo was based on sound field coupling calculations with the front fuselage and short wing shape. Copying a single blade may even have the opposite effect...

Besides, these days, wall-climbing parties fall into a gray category, and even if they catch the current situation, they are not easy to deal with.

After completing the unloading, Guo Jingshan directed half of the people who came with him to hurry up and install the rotors of the aircraft in preparation for the test flight, while the other half began to carry various daily necessities into the An-124 cabin.

Such a big plane has come and gone, but we can't go back empty.

The goods shipped back from China are regarded as flight time subsidies for the crew.

……

The first flight took place the next morning.

Mainly, it only took half an afternoon to assemble and inspect the helicopter, but it took nearly ten hours to refill and secure the An-124 pallet.

By the time the latter refilled the fuel and took off, it was already early the next morning...

"This plane is so damn big..."

Although Guo Jingshan is not engaged in fixed-wing, he still knows the size of the aircraft.

He had seen a Boeing 370 with a takeoff weight of about 747 tons before, but the shock was far less obvious than this An-124.

"It's a pity that we can't make new ones now..."

Yi Yuanhe, the chief engineer of Institute 603, also stood nearby and said as he watched An 124 gradually climb up and disappear into the horizon.

There was a hint of regret in his tone.

Liu Hongbo has been involved in the research and development of MA-60 for a long time, and he and Yi Yuanhe have met frequently.

Of course, the former could not even be counted as a formal member of the project team, but could only be counted as the person in charge of Party B of the outsourcing team.

It's just that now Liu Hongbo, as the representative of the Torch Group or Chang Haonan, has some differences in status.

So Yi Yuanhe came specially to meet him.

I also found a reasonable reason to take a closer look at the An-124.

After the airport returned to its former purity, members of the Ice City team acted quickly to make various technical preparations before the first flight.

Following Guo Jingshan's command over the intercom, Zhi 9WY's main rotor finally started to rotate slowly.