Because airships have more advantages when performing surveillance missions than faster aircraft, they can hover over the target area for a long time, which allows the reconnaissance instruments on it to detect targets accurately and efficiently.

In addition, at low speeds, the onboard radar can detect small targets more easily.

The airship here is a soft airship and is the most advanced airship in the world. Although many of the electronic equipment on it have been removed, its advancedness is unparalleled.

Generally speaking, airships can be divided into three types: hard airships, semi-hard airships and soft airships.

A hard airship is an airship that maintains its shape and rigidity from its internal skeleton (made of metal or wood, etc.). Its exterior is covered with skin, and the inside of the skeleton is equipped with many gas-filled airbags that provide lift to the airship.

The semi-hard airship must maintain its shape mainly through the gas pressure in the airbag, and the other part must also rely on a rigid skeleton.

As the name suggests, soft airships are not supported by skeletons. The biggest advantage of such airships is that they are easy to disassemble, assembly and transport.

Since the fifth sword and the others were prepared, Yu Shan would not say anything more. He traveled back and forth between the secret realm of the East Wilderness and the earth again and again until he brought enough helium to blow up the entire airship.

Looking at the huge creature in front of him, Yu Shan was shocked again. No wonder the fifth knife and the others wanted to use more than a dozen tree stumps as pillars. If they used them less, Yu Shan was really afraid that it would fly away by itself.

"The sky here is not as safe as you think, so the height must not fly over 300 meters." Yu Shan solemnly reminded him, looking at the airship that seemed to be about to fly at any time.

"Three hundred meters? Why? The height of this giant camphor tree is more than three hundred meters. Where does the danger come from?" Yu Shui finished his busy work and walked over and heard Yu Shan's reminder and asked strangely.

Yu Shan said: "Maybe there is no problem with more than 900 meters, but no matter how high I am, I can't guarantee it."

"Is there any danger above this height? Perhaps it is because of this unknown danger that the air here is so quiet?" Wu Dao asked immediately.

Yu Shan shook his head and said, "I don't know, this is just my guess. I have observed this planet outside the East Wilderness Secret Realm. It is indeed suppressed by the Demon-Suppressing Tower. The reason why we easily enter and exit the East Wilderness Secret Realm is entirely because of the spiritual energy on this planet.

The spiritual energy here is being absorbed by the Demon-Suppressing Tower every moment. We are going in and out of here along the passage of the Demon-Suppressing Tower to absorb the spiritual energy. So, I suspect there are restrictions in the entire air, otherwise, there would be no flying animals in this world."

This is something Yu Shan has always suspected. From the first day he came in, he felt that it was very strange. It would be fine if the grass grew tall, and the animals and plants were also very tall. Since that is the case, where did the birds go?

If there are birds, they will definitely fly higher and should be quite large, so Yushan can definitely see them.

However, since Yushan entered the secret realm of the East Wilderness, except for the group of beetles who wanted to fly, no other bird Yushan saw.

Also, there has not even been a wind here a few times, and at most it is a gentle breeze. Therefore, from this point of view, this place really looks like a sealed environment, so it is called a secret realm, rather than a planet that exists naturally.

The reason for this is that there are many unreasonable places here, which are not like the earth at all, so it should not be a normal planet.

In this case, there are restrictions in the air here and there are unknown dangers, so if you kill ferocious beasts that can fly, there is a possible reason for such unreasonable speculation.

"Don't worry about this. Wait for a while and we will experiment with the hot air balloon we brought before to see how high it can fly. Wouldn't you know whether it is dangerous or not in the air?" Seeing the tangled appearance of the fifth knife and Yu Shui, Yu Shan said with a smile.

"I didn't expect that the domestic technical level is so high that it can actually create such an advanced giant." Yu Shui sighed at the huge airship.

Yu Shan was also a little amazed: "How big is this?"

"It's more than 90 meters long, which is equivalent to the size of a football field." The fifth knife said proudly.

"Loading energy?" Yu Shan was most interested in this.

"The load capacity is as high as 10 tons." At this time, Zhao Tongwu also came over. He was no longer a problem with him. The rest was Tian Zhongcheng's debugging.

"Ten tons? It's ten thousand kilograms, enough." Yu Shan was amused when he heard this. Ten thousand kilograms are twenty thousand kilograms, which is definitely enough for them to use.

You should know that all sixteen of them are only more than one thousand kilograms. In this way, they still have a load of about nine thousand kilograms to use. With such a large load, how many ferocious beasts can they carry?

"What a good thing." Yu Shuidao.

Yu Shan could only nod. This was indeed a good thing, because there was no flying beast here that could threaten it, and there was no strong wind that made it unexpected. It can be said that the environment here is really suitable for this big guy.

"This thing is different from ordinary aircraft. It does not require a runway, nor is it limited to landing on land. It can land on water, ice, desert and other planes. It has a load capacity of up to 10 tons, can be modified to accommodate 48 passengers, and can fly continuously for 5 days, with a speed of 92 kilometers per hour." At this time, Tian Zhongcheng came over.

"The debugging is completed?" Wu Dao asked immediately.

Tian Zhongcheng said: "There is nothing adjustable. It's just a set of close-range battlefield radars and a close-range thermal imaging system. It's easy to debug and now it can be pedaled."

"Let's go up and take a look." Yu Shan said immediately.

"Have you tried such a large airship in China? There will be no danger when flying, right?" After everyone entered the pod, Mi Xiaoyong said with a little fear.

"You are just timid boy." Pang Tong smiled and patted Mi Xiaoyong's head.

"I'm not worried. You have to know that tools like airships are prone to accidents." Mi Xiaoyong said dissatisfied.

"By the way, this is not the military's experimental type, right?" Yu Shan also asked.

At this time, Wu Dao said a little embarrassedly: "I said it was from the military, but I didn't say it was from the domestic military. Don't worry, this type of airship has undergone flight tests and there is no problem at all."

"Not domestic?" Yu Shui asked strangely.

Tian Zhongcheng said at this time: "In fact, this is modified based on Sky Lander. Some time ago, I should have tried flying Sky Lander No. 10 abroad, and it was very successful."

Tian Zhongcheng did not hide it like the fifth sword. He directly told the origin of this airship.

The airship was originally designed by the United States and was originally planned to be used to monitor the battlefield in Afghanistan, but the US military later canceled the project.

Later, the Hybrid Space Vehicle Company still intends to produce and hopes to open a new chapter in the airship.

The Sky Lander was originally designed at the request of the US Army, and its design was implemented as early as 2010 and was developed by the British "Hybrid Aircraft Co., Ltd.", which cost about 30 million pounds (about 50 million US dollars).

The US military originally wanted to use it for surveillance and detection, but it stopped research and development due to insufficient funds. By 2013, a British airship company manufacturer acquired the company, but later it stopped development due to insufficient funds and stayed in Belfordshire.

In February 2015, the British authorities allocated 3.4 million pounds for funding, but changed its purpose to shipping cargo, because its shipping cost is 1 to 20% cheaper than helicopters. The company responsible for the design now plans to produce 10 units per year in the next five years.

In May 2015, the British company Hybrid Airship Company took the Sky Lander 10 hybrid airship project and obtained nearly 1,000 investors through a crowdfunding website to raise about 2.37 million pounds, and finally completed it.

This is the world's largest aircraft built by the UK, and it was successful after the first test flight.

This super aircraft looks like a giant airship, with a length of 92 meters, equivalent to the size of a football field, 18 meters longer and 255 meters higher than the largest passenger aircraft Airbus A380 and Boeing 747-8, equivalent to 6 double-decker buses, or the height of a 9-story apartment building.

The airship in front of Yu Shan was copied from the data of the sky lander, so Yu Shan and the others were stunned when they looked at the huge airship.

"This airship combines airship, helicopter and aircraft technology, and is the world's largest aircraft. It can fly continuously for two weeks." After introducing this airship, Tian Zhongcheng finally said.

"The largest airship in the world? It's really big enough." Mi Xiaoyong exclaimed.

"Yes! The original intention of this thing was to design it was because it had lower energy consumption and greater carrying capacity than ordinary aircraft. If it weren't for this, the airship could fly up to 4,900 meters, and the fastest speed reached 148 kilometers per hour. It could fly non-stop for two weeks," said Tian Zhongcheng.

"Actually, the load capacity of ten tons is really not very large. If the sky here is really safe and there is no strong wind, we can also build the world's largest airship to use as an air base." At this time, the fifth knife suddenly said.

"The real world number one?" Yu Shan looked at the fifth sword and said.

The fifth knife said: "Yes, the real world number one, the first in history is much bigger than this airship, but he is a flash in the pan."

"You are talking about the Hindenburg, are you?" Tian Zhongcheng said as the airship slowly took off.

The fifth knife said: "Yes, I mean the Hindenburg. It has a total length of 2486 meters and a maximum diameter of 414 meters. With such a large airship, the fuel and engine weigh only 100 tons, but it can carry 363 tons of passengers and cargo."
Chapter completed!