After bidding farewell to Sun Heng and the others, Li Yan returned to the farm under construction, and was very comfortable to see that the things on those drawings had become a reality in the same way. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

After Li Yan had an in-depth understanding of the defense system of the farm, he admired Wei Minsheng's designs to the extreme, and the only thing he didn't understand was why this fortress with super defensive capabilities didn't design a lookout point, how could an enemy invasion be detected early without a lookout point, let alone organize effective counterattack measures in time.

After raising his questions to Wei Minsheng, Wei Minsheng said that the ordinary watchtower is too low, the observation range is too small, and when the construction of the farm is completed, a lookout point will be installed that is higher than the gate of Huaxia Villa, which is definitely more practical than the ordinary watchtower.

It was higher than the mountain gate of Huaxia Villa, Li Yan didn't dare to imagine how to build it, perhaps, the lord had something new to come up with.

This time Li Yan really guessed right, it turned out that Wei Minsheng was preparing to build a floating lookout point, which did not occupy much space, but also had a wide enough field of vision, and most importantly, this floating lookout platform could also be used as the basis for a wireless network in the future.

Since the application of wireless signals outside the Huaxia Villa in this world is almost zero, there is no electromagnetic interference phenomenon that is prevalent in the real world, and the propagation distance and stability of the signal are not comparable in the real world.

Moreover, after this aerial lookout platform has a sufficient height, it can not only achieve a wide range of coverage of the local network, but also if an appropriate high-power directional antenna is installed, the use of microwave communication can even realize the wireless LAN connection between Huaxia Villa and Lijia Farm.

The frequency of microwave is extremely high, the wavelength is very short, and its propagation characteristics in the air are similar to that of light waves, that is, they go in a straight line, and they are reflected or blocked when they encounter obstacles, so the main mode of microwave communication is line-of-sight communication, and it needs to be relayed and forwarded after exceeding the line-of-sight.

Generally speaking, due to the influence of the earth's surface and the loss of space transmission, it is necessary to set up relay stations every 50 kilometers or so to amplify and forward the radio waves.

Wei Minsheng found through the satellite map that the straight-line distance from the villa to Yiling is about 50 kilometers, Huaxia Villa is originally located on the mountain, you can choose a higher position on the top of the hill to build a fixed microwave communication tower, coupled with the height of the floating platform, there are conditions for visual distance communication with the villa.

In terms of the construction method of this floating observation platform, Wei Minsheng originally wanted to use several large hydrogen balloons to carry a hanging basket to achieve it, but this hydrogen balloon is not easy to control take-off and landing, and the buoyancy is easily affected by temperature changes, and there is also a risk of fire, so it was deducted.

Helium balloons are safer than hydrogen balloons, but they cannot be controlled by the balloon, and if they are not bound by the rope, they will be blown away by strong winds, in which case the person on the balloon will surely die.

Wei Minsheng also considered the hot air balloon, but after watching the hot air balloon liftoff video, he was still a little dissatisfied, one is because the fuel used in the hot air balloon is not easy to solve, and the other is because the hot air balloon is too troublesome when it is lifted off, first of all, you have to use a blower to blow up the air bag, in order to heat the air inside the air bag, produce upward buoyancy, and the third is that the flame sprayed is not well controlled, it is easy to ignite the gas bag, causing an accident.

After comprehensive thinking, Wei Minsheng specially ordered a small hot air balloon, which can only carry three or four adults, but the airbag mouth below is larger than the usual hot air balloon, and a circle is made of aluminum alloy to prop up the airbag mouth.

In addition, a ring airbag that can be loaded with a hot air balloon was ordered, and the material was made of helium balloons, which had good airtightness.

Then Wei Minsheng filled the annular airbag with helium, and used a rope to fix the edge of the hot air balloon to the annular helium ring, just like putting a swimming ring on the hot air balloon.

In this way, the small hot air balloon does not need to be blown up with a blower like a normal hot air balloon, and the hot air balloon can be lifted up with the buoyancy of the helium ring.

Wei Minsheng looked at the state of the airbag rising, and found that although the helium ring had opened the airbag of the hot air balloon, the top of the airbag was hanging softly, and it was necessary to pay attention to the size of the flame when the fireblaze was lifted into the air, otherwise it would be easy to set the airbag on fire.

So, I bought a smaller helium balloon and hung the top of the hot air balloon, which was much more convenient to breathe fire, and I didn't have to worry about the gas bag at all.

Since the helium ring is close to the hot air balloon, the heat in the hot air balloon will also slowly heat the helium in the helium ring through the contact place, and the thermal expansion and contraction of the gas is very obvious.

In order to prevent the heated helium from bursting the helium ring, only 80% of the helium ring is filled with helium, leaving some space for expansion, so that the helium ring can obtain greater buoyancy with the increase in volume after heating.

The helium-added hot air balloon almost cancels out the buoyancy in the air and its own gravity, so it appears very light and can be easily moved by almost a person.

After heating the air in the balloon, the balloon, which could only carry up to four people, was able to carry six adults with a helium ring.