Chapter 1149

The surprise was not only the army leader who accompanied the big leader, but also other leaders and leaders with military background.

There's no way. The level of noise control shown by zhi-8max is beyond the cognitive scope of everyone.

What is the external noise level of 85 dB?

That's the volume of traffic on busy roads.

For ordinary people, this volume is a bit noisy, but for a large helicopter equipped with turboshaft engine, reducer, hub and maximum take-off weight of 14.8 tons, it's almost like scratching.

To know the same level of Zhi-8 helicopter prototype, the French "Super Hornet" helicopter cabin outside the volume can reach 108 decibels.

Due to the imperfect system integration, the noise control of the old model Zhi-8 is not as good as that of the original model, reaching 112 dB, which is almost the same as that of the first generation zhi-5 helicopter.

This is also the reason why the French "Super Hornet" helicopter is clearly a large-scale helicopter platform specially built by the French aviation industry for the French navy. It should be changed into a refitting platform for the excellent professional anti submarine helicopter of the domestic Navy, but it has become a mascot that can only be publicized to the outside world after it is placed.

Its own noise is too big, even if it is integrated with the most advanced airborne sonar detection equipment at that time, it can not accurately search the exact location of the submarine.

Because the three engines of Zhi-8 roar like this, do the sonar want to hear the sound of the bottom of the sea? All over the screen is the vibration of the helicopter itself!

And with the huge noise, it is violent vibration, and its vibration level is basically maintained at about 0.2 g, that is to say, a 200 kg fat man sitting on it naked can obviously see the fat on his body rolling up and down like a water wave.

In this case, what kind of precision detection instrument can stand?

It's estimated that the detection instruments fixed in the cabin were shaken apart before we caught any submarines.

Based on this, even if the navy in the 1980s and 1990s had platforms of the same level as the "Sea King" helicopter, it did not transform into a classic carrier based helicopter like the "Sea King" helicopter. This is the key reason.

After that, we had to choose the smaller zhi-9 as the carrier helicopter to undertake the task of aviation antisubmarine formation, which is also the reason.

Because of the zhi-9 prototype, the French "dolphin" helicopter belongs to the third generation helicopter. The noise outside the cabin is controlled at 95 dB, and the noise inside can be controlled at 85 dB. With other special technology processing, the airborne sonar detection equipment can be used normally.

The imitation zhi-9 inherits the noise reduction characteristics of the "dolphin" helicopter, which is favored by the Navy.

In contrast, the zhi-12 built by Tengfei group is not as good as the zhi-9 in this respect. The noise level outside the cabin is 98 to 102 dB, and the noise level inside the cabin is basically maintained at about 90 dB.

The vibration level is 0.12g lower than that of the old zhi8, but 0.1g higher than that of zhi9, so it has a great impact on the detection accuracy of underwater acoustic equipment.

Because of this, the Navy does not have a large number of equipment for the zhi-12, but only a small amount of procurement. Even so, a small number of the zhi-12 are used by the Marine Corps. It can be seen that the navy is not optimistic about the zhi-12.

There is no way to solve this problem. At the beginning, the development of zhi-12 was more about solving the problems. The consideration was not comprehensive, and some defects were inevitable.

However, when it comes to the zhi-8max, it is different. Since it is clear that this is a shipborne helicopter for the Navy, it is necessary to consider the Navy's combat environment and mission requirements. Therefore, noise reduction and shock absorption must become an important index to improve.

Therefore, this improvement "perfects" a world advanced level.

You should know that 85 dB is just the noise level outside the cabin of the straight-8 max, while only 60 dB is inside the cabin.

60 decibels. That's the level of their normal voice.

This is almost negligible for a helicopter with complex mechanical structure. What is the vibration level under such noise?

"0.05 gram!"

Zhuang Jianye gave an extremely low number, which is twice as low as the vibration level of zhi9 helicopter, which is now widely equipped in the Navy.

Compared with the old straight 8 is reduced several times.

That is to say, a 200 kg fat man sitting naked on it is similar to a Boeing 737 or an Airbus A320. Instead of shivering all over, he will feel very comfortable.

For the Navy's ocean fleet

"This will undoubtedly be a great help to our future naval ocean fleet!"

When people including the big leaders began to try to imagine the battle composition of the Navy formation, Zhuang Jianye had given the answer without hesitation. Not only that, Zhuang Jianye further said: "as just said, the biggest feature of zhi-8max is quiet, but in addition to quiet, it has enough space.At present, the cabin of the zhi-8max advanced VIP version is only 6.5 meters long, but the real Navy model is 7.06 meters long. "

With that, Zhuang Jianye went to the ordinary cabin in front of him and made a big round gesture in the middle of the cabin: "so there will be a 360 degree circular sea search radar under this position, and then a suspended active deep-water sonar will be placed at this position..."

Before speaking, Zhuang Jianye went through the crowd and walked to two-thirds of the cockpit. He drew a stroke on the sofa, then quickly walked to the back of the cabin, pointed to two positions and continued: "here are two circular sonar buoy launching devices, each equipped with 10 sonar buoys, two of which can carry 20 sonar buoys."

After that, he stepped back and pointed to a position behind the grid door in the middle of the engine room and said: "this position can be used to place the data processing computer and integrated communication equipment of the detection equipment. And here... " Zhuang Jianye took another shot outside the door: "the signal control and operation console can be set up in three or integrated into two, depending on the situation.

Finally, with the four light anti submarine torpedoes, the retractable magnetic detector at the tail of the body, and the endurance of 4.5 hours, its combat capability is no less than that of a small fixed wing anti submarine patrol aircraft.

So it only needs two or three straight-8max, which can provide quite favorable antisubmarine alert and search for the formation of ocean going ships... "

In the luxury cabin of zhi-8max senior VIP, Zhuang Jianye described the internal situation of a comprehensive antisubmarine helicopter with sea search radar, magnetic detector, sonar buoy, active deep-water lifting sonar, light antisubmarine torpedo and other comprehensive search, positioning and attack.

It goes without saying that it is advanced. Among other things, the carrying capacity of four light torpedoes alone has far exceeded the current zhi9, let alone the endurance of 4.5 hours. The paper data of ka28 imported from Russia is just the same.

But the problem is

"It's tempting to say that, but it's very demanding for the platform. Are you sure your zhi-8max is competent?" The military leaders are experts in the field of equipment. After hearing this, they frowned and asked frankly.

Zhuang Jianye is very calm response: "of course can be competent, because this straight-8max is a real four generation machine!"