What makes Liu Yun a headache is that whether it is a coal mine or electricity, it is impossible to solve it, and the iron mine is good to say, according to the survey of the expert group, there are large iron mines near the county seat, and the water source is also easy to say, although there are no big rivers around, there are many seasonal small ditches, and the nearby mountain tops are full of perennial ice and snow, and it is the best water source when it melts.

As for transportation, it is easy to do, Liu Yun has the best miners, the alien version of the ant robot, all difficulties and obstacles are trivial for them, of course, the premise is not to go too far, and in the end it still needs to be matched by railway and road, otherwise it is steel that cannot be transported.

By the way, Liu Yun remembered another fateful thing, once the war broke out, planes and tanks still need oil, if you can find a coal mine, what kind of coal oil can you do, it's just a little troublesome, of course, if you can find oil, of course, it is better, I don't know if there is oil in the plateau area at an altitude of more than 2,000 meters, so we must immediately survey the county.

How to survey, Liu Yun was a little dumbfounded, from the county records of western Sichuan, there are 80 percent of the land in this county, or an inaccessible area, either glaciers or high mountains, fortunately, the jurisdiction of this county is relatively large, more than 4,800 square kilometers, worthy of two or three counties in other places, theoretically speaking, a large number of rare resources should be buried.

It is already December, and it is only about two months from the Spring Festival of 1935, which is the coldest period of the western Sichuan Plateau, not to mention surveying the terrain and resources in the field, that is, walking around the county seat and between various districts and townships, which is an incomplete.

When Liu Yun had a headache, he couldn't help but think that if it was in the 21st century, what good way would it be, first of all, satellite remote sensing, where did the satellites come from in this era, and even long-range rockets could not be manufactured, followed by aircraft aerial photography, which was relatively reliable, the problem was that even the optical lens of slightly better quality could not be made in Huaxia, and where did the high-altitude photography technology come from.

When he was about to give up, Zhi Brain told him that the problem of photography was handed over to it, and Liu Yun remembered that Zhi Brain also had a scanning function, and he was overjoyed, if the firepower was fully opened, it could cover 30 kilometers, and the county area would be 4800 square kilometers, and then considering the twists and turns of the terrain, if calculated according to 100 kilometers square, it would be equivalent to flying 400 kilometers.

Liu Yun hurriedly inquired about Zhi Brain, what is the scanning radius now, Zhi Brain regretfully told him that it is only a pitiful 1.5 kilometers at present, it is hard to believe, I remember that before I was promoted to the Qi Refining Realm, the scanning radius seemed to be more than 3 kilometers, but now it is not as good as before.

Zhi Brain did not have any emotion to answer, if it is not to detect underground mineral deposits, if it is not to detect in the air, if there is sufficient energy support, a detection radius of fifteen kilometers can still be guaranteed, but unfortunately, these problems are negative, and it has not included the problem of special weather and special terrain, so it is still the most optimistic data.

"The most optimistic", Liu Yun was dumbfounded, he couldn't come back to his senses for a long time, forget it, or recalculate, the radius is 1.5 kilometers, the diameter is 3 kilometers, if you add unexpected factors, I'm afraid you have to consider it conservatively, convert it to 2.4-2.8 kilometers.

Then 100 kilometers square, that is, equivalent to an airplane flight, 3600 kilometers to 4200 kilometers, in addition, the actual flight, is different from the theoretical flight, Liu Yun thought bitterly, because it is also necessary to consider the aircraft in the air, up and down adjustment or acceleration adjustment, as well as the problem of transfer and round-trip, etc., that is, the total flight course, estimated to be 10,000 kilometers, is not an exaggeration.

In addition, Liu Yun has no aircraft in his hands, only a mecha that can glide over short distances, the best flight speed is 72 kilometers per hour, the sailing time is 70 minutes, and the actual flight radius is only less than 40 kilometers.

Fortunately, when departing from Wuhan, the transport fleet brought more gasoline, and although it was used all the way along the way, if you carefully raise it, there are still more than ten tons of gasoline, which is enough to support the bat mecha and complete the aerial photography of the entire western Sichuan County one by one.

If you only rely on the bat mecha to detect the terrain, it seems a bit unreliable, Liu Yun secretly calculated, only to find that this thing has a lot of shortcomings, not only the legs are short, the flight is slow, and for the valley turbulence of the western Sichuan Plateau, there is no resistance at all.

It doesn't matter if there is no plane, Zhi Brain has already recorded a full set of drawings of Hawk III., the big deal is to use some ant alloy, so that the ant robot can be directly processed, Liu Yun suddenly opened his brain, let Zhi Brain directly simulate the processing of the aircraft, and soon the results came out, there is no difficulty, but the lack of rubber and non-metallic raw materials, so the plane will look a little bulky, about 2 tons more.

Although Liu Yun is a layman, he still cautiously asked Zhi Brain, what is the impact on the overall performance, he was really frightened by Zhi Brain's previous convictions, taking the processing of ancient tree leaves as an example, what drug effect was slightly reduced, and it was only found in the end that only one-third of the drug effect.

Zhi Brain is this good, as long as you ask clearly, it will also answer clearly, as Liu Yun expected, the answer was a bit unexpected, and it made the cold sweat on his back flow.

The answer is no, there are three consequences, one is that the flight speed is too low, the speed will be less than 280 kilometers per hour, the second is that the thrust ratio of the engine is too low, it is simply unable to resist the turbulence in the highlands and mountains, and the probability of flight accidents is 100%, and the third is that the aircraft cabin is not closed, the impact of low temperature air flow on people is particularly serious, and the pilot cannot work for a long time.

In the 21st century, Liu Yun is not even an ordinary military enthusiast, but he has heard of the famous F35 and F22 fighters of the US military, and these two fighters have one of the most significant characteristics, that is, the high thrust-to-weight ratio, of which the F22 thrust-to-weight ratio is 1.0.

Of course, at the level of a liberal arts student, how to calculate the thrust-to-weight ratio of the aircraft is too professional, but Liu Yun knows one thing, that is, the greater the thrust of the engine, the better, and the smaller the weight of the aircraft, the better, but it is best not to exceed too much, because with the thrust is too large, when the aircraft flies, the greater the overload will be, and the pilot will not be able to stand it, and even shock or death or the like, it is said that when the thrust-to-weight ratio is 1.2, you can take off and land vertically.

I haven't figured out how to calculate the thrust-to-weight ratio, Liu Yun is already dizzy, but fortunately, he has a smart brain that can simulate flight, and directly put him in a certain state of flight, let him experience it himself, at the beginning, the greater the thrust, the faster the flight.

However, once the thrust-to-weight ratio was close to 0.8, the flight speed was soon close to the speed of sound, and there was a violent bump, Liu Yun himself was also very uncomfortable, his chest was tight and wanted to vomit, he was black for a while, red for a while, and he was so frightened that he hurriedly called the brain to pause.

It took Liu Yun a long time to recover, and he wanted to vomit when he thought of flying, but fortunately there was a primary treatment solution, and he took it orally before he took his breath, but the improvement of the plane had to continue, and if it was done one day earlier, it would take one more day to develop, and finally it would be corrected according to memory.

By the way, Liu Yun suddenly remembered something, a few days before the crossing, the U.S. military seemed to have re-equipped 100 P51 Mustang fighters, this fighter was first produced by Curtis, or the main fighter currently used in China, the successor model of the Hawker III, it is said that it is still the main fighter of the U.S. Army and even the Allied forces in the late stage of World War II, once dominated the skies of Asia and Europe.

At that time, Liu Yun also thought it was fun, and also read it slightly, and now he only needs to recall it, and found that the power is about 2,500 horsepower, the weight is about 3.2-4.5 tons, the lifting limit is 12,000 meters, the flight speed is 700 kilometers, and the combat radius is 2,000 kilometers.

Of course, whether it is an aircraft or a tank, the first thing is to produce engines, and there is experience in developing tank engines, so the new engine only needs to be slightly enlarged on the basis of the original.

After setting various parameters first, and then simulating them one by one, the size of the mature tank engine was enlarged to 800×800×800 mm, and the maximum power output reached 600 horsepower, and the standard engine consisted of two modules with a power output of 1200 horsepower.

Not even half of the 2500 horsepower, Liu Yun is also confused, what to do, do you want to enlarge again, just do it, enlarge the module again to 1000×1000×1000 mm, the engine power output is only 1600 horsepower, do not believe in evil and amplify again, 1200×1200×1200 mm, engine power output 2200 horsepower, do you want to amplify again.

Liu Yun didn't dare to enlarge it anymore, the size of the two standard modules in series was already larger than the engine on the Hawker three fighters, even if you wanted to put it in, if you really wanted to enlarge it, it was not impossible, but the problem was that even if it reached 2500 horsepower, the weight would also increase, and the thrust-to-weight ratio was declining, which was a bit more than worth the loss.

Liu Yun thought about it in a blink of an eye, anyway, it was to change the layout of the aircraft structure, so he simply redesigned an airplane, if he wanted to make up enough 2500 horsepower, 3 800 horsepower should be installed, three-engine planes were not common at all, 2 1200 horsepower should be installed, twin-engine bombers and transport planes abounded, and he just wanted a terrain reconnaissance aircraft anyway, so it was it.

Zhi Brain quickly designed a new aircraft, the prototype is still the Hawker three fighters, but from a single engine, to a twin engine, distributed in two wings, 3.0 meters high, 7.9 meters long, wingspan 10.2 meters, propeller radius 0.6 meters, the cockpit is fully enclosed, two G34 machine guns, and a 20 mm cannon, the total empty weight of 2.2 tons, can be loaded with fuel and ammunition of 1.2 tons, the maximum speed of 680 kilometers per hour, the best speed of 380 kilometers, the theoretical range is 3800 kilometers.

Seeing this strange-looking plane, Liu Yun couldn't figure out whether it was a fighter or a bomber, and finally entered the simulation state of the brain, and the effect came out quickly, the wings were easy to fall apart, the structure was not compact enough, the shaking was large during the flight, and the resistance during the flight was very large, resulting in amazing fuel consumption, and it was impossible to reach the maximum theoretical range.

Stop and stop and change, change and stop stop, and finally simulate flying, Liu Yun was in his own home, and he did it for two or three days, and sometimes even the meal was sent to his bedroom by Pang Yuyan or Yin Qinlan.

Old Man Liu also saw him a few times, and he came here with excitement and left in disappointment, and he was afraid of disturbing his cultivation, so he had to hide his thoughts in his heart, and he wanted to ask Yin Qinlan several times to go to the Star Spirit Courtyard to find two immortal aunts to see if he could be cured, but he had some worries and had to give up.

Where there is a will, there is a way, after several magic changes, the appearance of the plane can finally be changed, that is, it is with the mainstream shape of this era, some incompatible, probably only Liu Yun himself is satisfied, the whole plane is in the shape of a big triangle, because of someone's bad taste, a bit like F22.