"When the Hindenburg is fully fueled, it can carry 110 passengers and crew and fly 16,100 kilometers at a speed of 130 km/h, which is a far cry from the Hindenburg airship. Pen % fun % Pavilion www.biquge.info "Fifth Knife Road."

"It's a pity that the Hindenburg crashed, and no one knows if there was a design problem, so even if there is a copy of one, it is likely that there is a problem." Tian Zhongzhong said.

Construction of the Hindenburg airship began in 1931 by the German Zeppelin company, and five years later it became the largest, most advanced and most luxurious airship in the world at the time.

On May 6, 1937, the USS Hindenburg, which had crossed the ocean, burned up during an attempt to land over Lakehurst Naval Air Terminal in Manchester, New Jersey, USA.

On May 3, 1937, the Hindenburg left Frankfurt for New York with 97 passengers and an airship crew on board.

When the graceful curves of the Hindenburg appeared over New York City, people left their cars to feel the shock of this great industrial marvel.

When the Hindenburg arrived at Lakehurst Naval Air Terminal, the captain ordered the mooring line to be lowered.

At this moment, the "Hindenburg" suddenly lost its balance, 1.1 tons of ballast water poured from the tail onto the airship lawn, the airship that lost ballast water floated like a kite, and its tail fin then grazed the ground, was torn open a large hole, and the fireball inside instantly turned into a raging fire.

A few seconds later, the entire airship was engulfed in flames, and the disaster killed 13 passengers, 21 crew members and one ground crew.

Such an airship, even if it could be copied, Yu Shan and they would not dare to use it.

"Don't be greedy, we have a land base, and we have such an air base, it's already very good, there's no need to make it bigger." Pang Tong said.

"Three hundred meters above the ground this time? How do I feel high? When the height of the airship exceeded that of the giant camphor wood, Yu Shui sighed.

"Let's hope there are no beasts in the air here! Otherwise, we will be miserable. Standing in the pod, Tang Baobao and Liu Furong hugged each other, looking a little scared.

Yu Shan said: "Okay, you can reduce the height, the pod is no more than seventy meters from the ground, it should be a full distance, there are no fierce beasts around that can threaten seventy meters above the sky." ”

"It's too quiet here, isn't it?" The airship slowly lowered its altitude, Tang Baobao and Qiu Furong also calmed down, and Tang Baobao, who had vitality, immediately looked out through the extension of the pod.

"There's someone down there, all pay attention, keep quiet, there's someone down there." At this moment, an alarm sounded in Yu Shan's ears.

This is the wireless headset, the communicator they brought in this time, and the signal transmitter is on the airship.

"There's no need to worry too much, this airship is so big, we can't hide it, so let's just be generous and fly over their heads." Yu Shan said with a wry smile.

Although it has been more than a week since he came to the Eastern Wilderness Secret Realm, Yu Shan's range of activities is very small, within a radius of a few kilometers, within such a distance, hundreds of people, or even thousands of people have gathered, and a behemoth like an airship cannot be hidden at all.

With far-infrared detectors and heat detectors, it has become much easier for Yu Shan and them to search for prey, and of course, it has become much easier to find humans, because they also have close-range battlefield radar, which is a sharp weapon on the battlefield, and no enemy can hide in front of it.

Not far from the base of the mountain, the entrance to the small valley with the small river, a group of people hid in a patch of grass, apparently waiting for the rabbits.

As long as you are active in this area for a few days, this small valley will sooner or later be discovered, as it is the only source of water within a few kilometers of the vicinity.

Of course, the river meanders out of the valley and burrows into the grassland, but there are so many weeds that animals do not dare to drink water on the banks there, so they gather in this valley, so it naturally becomes a paradise for predators.

Therefore, it is not surprising that human beings gather here.

"What are we going to do next?" The fifth knife looked at Yu Shandao.

Yu Shan thought for a moment and said: "Since we have come in, the time is just right, our airship is hovering at the entrance here, tonight we hunt, after stockpiling enough food and essence blood, we will go to look for medicinal materials during the day tomorrow, it seems that there are more medicinal materials on the mountain." ”

Yu Shan pointed to the mountain range not far away, there were many medicinal herbs on the mountain, but it was also more dangerous, so Yu Shan never entered the mountain range.

"I don't think we need to be in such a hurry, tonight's hunt can't be canceled, but tomorrow during the day, we can first observe the animal population here, so that we can know ourselves and each other, so that we can establish a base here with peace of mind." Qian Xiaohao put forward a different opinion at this time.

"That's right, how many unknown beasts are there here? If we don't figure it out, we will always have concerns in our hearts. Pang Tong also agreed.

Yu Shan thought for a moment and said: "Since we have advanced equipment, then do as you say, with enough essence blood and food, we can exchange some medicinal materials with others first, let me go, I will take Huang Da over, with him joining, our strength will be stronger." ”

"Since the airship has been discovered, why don't we fly directly to that camp, and if we can, it would be nice to dock there." At this time, Zhao Tongwu raised the gun in his hand.

"Okay, there are a lot of trees there, and it's easy to make a few pillars, but if you stop there, you need to stand guard and be on duty." Yu Shan thought for a moment and said.

"The effective distance of the far-infrared detector is one hundred and twenty meters, although it is not far, but as soon as someone approaches the airship, we will immediately receive an alert." Zhao Tongwudao.

Yu Shan nodded, as long as his own safety is guaranteed, he can naturally come as conveniently as possible.

Compared with the battlefield radar, the far-infrared detector on the airship is more sensitive, and any temperature change can be reflected on the instrument, so it is more afraid of being sneak attacked.

In an infrared detector, a thermoelectric element detects the presence or movement of a human body, converts the output signal of the thermoelectric element into a voltage signal, and then performs a waveform analysis of the voltage signal.

Therefore, a detection signal is output only when a waveform generated by the human body is detected by waveform analysis.

Infrared detectors work by detecting infrared rays emitted by the human body, and the detectors collect infrared radiation from the outside world and then gather it on the infrared sensor.

Infrared sensors usually use pyroelectric components, which will release an electric charge when the temperature changes after receiving infrared radiation, and generate an alarm after detection and processing.

The detector is designed to detect radiation from the human body, so the radiation sensing element must be very sensitive to infrared radiation with a wavelength of about 10 μm.

In order to be sensitive to the infrared radiation of the human body, its radiation surface is usually covered with a special filter, so that the interference of the environment is obviously controlled.

Infrared detector, its sensor contains two pyroelectric elements connected in series or in parallel, and the two polarization directions made are just opposite, and the ambient background radiation has almost the same effect on the two pyroelectric elements, so that the electrostatic effect of the detector cancels each other, so the detector has no signal output.

Once the intruder enters the detection area, the infrared radiation of the human body is focused through part of the mirror, so as to be received by pyroelectric electrons, but the heat received by the two pyroelectric electrons is different, and the pyroelectric is also different, which cannot be canceled out, and the alarm is generated by signal processing.

Ordinary infrared detectors only have two beams and an irradiation range of only 60 meters, while Yu Shan's far-infrared detectors can be strengthened to 120 meters, which is already very advanced.

Of course, this is definitely not as advanced as the one used by the military, but it is not bad that Yu Shan can buy this kind of equipment through the fifth knife.

Of course, they also have a heat detector, which is much simpler, and the heat detector consists of an external temperature detector and an internal temperature detector.

A microcomputer calculates the difference between the outside and the inside and the inside temperature and monitors the temperature difference to detect events where the temperature difference is greater than the predetermined value and has lasted for a predetermined period of time or more.

If the microcomputer detects a temperature difference that is greater than the predetermined value and has lasted for a predetermined time or more, it outputs an abnormal signal to indicate an anomaly in the external temperature detector.

In fact, one of the two instruments is to directly detect the radiation of living organisms, and the other is to detect the temperature difference of the outside world.

The simplest is the difference between the temperature of the human body and the temperature of the outside air, as long as there is such a temperature difference for a long time, the heat detector will sound an alarm.

These two machines are actually a supplement to the battlefield radar, and on the battlefield, the fastest reflection speed is the battlefield radar.

The airship was finally fixed a hundred meters in the air and flew at a low altitude, so that the place where the airship flew over, whether there was any living thing underneath, was all exposed to the instruments in the airship.

Unlike Qian Xiaohao, the six soldiers brought over by Yu Shan this time can be regarded as having their own strengths.

For example, Zhao Tongwu coordinates the command, he knows everything, but he is not proficient, so he is the best candidate for command.

Tian Zhongzhong's electronic equipment, professional is investigation, Gu Hui is communication, can be regarded as Zhao Tongwu's deputy, Zhao Tongwu has orders, all through Gu Hui to complete, of course, if Zhao Tongwu has something, it is Gu Hui who gives the order.

Song Mingming is a sniper among them, and he does a good job of reconnaissance and guarding, and he is on guard when he is usually fine.

Qin Yumo don't look at his name, in fact, this guy is a meat shield, infinitely powerful, full-time defense, and at the same time he is also proficient in explosives, but it seems that this is not needed here.

The last one is Zhang Huishan, an ancestral Chinese medicine practitioner, who is from a family, whether it is a legendary medicinal material or an ordinary medicinal material, he knows it well, he is the doctor of their team, and the most proficient thing is life-saving and surgery, so he has this flying knife stunt, and the flying knife used is all kinds of scalpels. (To be continued.) )