Cottages are naturally the most convenient and quick choice, but unfortunately, due to the emergence of missiles in later generations, only small-caliber anti-aircraft guns jishu are still developing, and large-caliber anti-aircraft guns have been difficult to see (probably only used when anti-hail), and during World War II, large-caliber anti-aircraft guns with proximity fuses are the backbone of anti-aircraft firepower. Fortunately, Hu Weidong has already reached the level of "one know-how when one know-how" for artillery, as long as the anti-aircraft gun has a large length-diameter ratio (generally expressed by the letter L, such as L52, it means that the length of the barrel of the gun is 52 times its caliber, the larger the length-diameter ratio, the greater the muzzle velocity of the projectile, the longer the firing range, the higher the accuracy, and the stronger the penetration of the shell. The performance will not be bad, but the large-caliber anti-aircraft gun barrel of L56 and even L60 will have to wait until the electroslag remelting and self-tightening of the body barrel are successfully developed

In addition to artillery, a variety of new types of ammunition, such as submunitions and airburst bombs (anti-infantry jumping mines also belong to this category), have also begun to be developed one after another, among which Hu Weidong attaches the most importance to the focus of his research in the years before his crossing - cloud burst bombs. It stands to reason that the cloud burst bomb has high requirements for the petrochemical industry, and although Hu Weidong has bought a lot of related equipment, there is still a long time before the formation of production capacity, and it seems too early to start the development of the cloud burst bomb. However, Hu Weidong has his own reasons for doing this, and there are too many backward powers in China today, so we must seize every minute and every second to work hard to narrow the gap between China and the advanced countries. The petrochemical industry in the base area was almost established, and mass production could begin immediately. It was also reminded by this incident that Hu Weidong tried his best to squeeze out some time and compiled Shijie's "Introduction to Concurrent Engineering", which would become a sensation in the future

In addition, there is another type of ammunition that has to be mentioned, that is, depleted uranium alloy shelling and armor-piercing shells, because the slag required for bituminous uranium is not noticeable. With these high-grade stones, Yang Chengzong, the "father of radiochemistry" of New China who came to Luoyang after the Xi'an Incident, used chemical methods to extract a large number of high-purity uranium compounds cheaply and efficiently. As a result, the acquisition of uranium metal is naturally a matter of course. Since Hu Weidong's reason for buying bituminous uranium was to make special armor-piercing shells, after having ready-made metallic uranium, it is natural to really produce some so as not to arouse suspicion, anyway, the uranium-235 that can be used to make nuclear weapons is only 7 thousandths of the metal uranium (and the uranium-235 that can be extracted only accounts for 5 thousandths of the total natural uranium). It doesn't waste much nuclear fuel, and the uranium alloy shell-piercing projectile is indeed very powerful, and it is completely worthy of special production.

Uranium alloy has three properties that make it the best material for shelling armor-piercing bullet cores. The first advantage is that the density is high, for a projectile flying at high speed, the higher the density, the greater the kinetic energy, the stronger the penetration, and although pure uranium is very soft, as long as a little titanium and other metals are added. can be turned into a hard alloy; The second advantage is that the shape of the uranium alloy bullet core will become more and more sharp in the process of penetrating the armor, while the vast majority of metals and alloys will become more and more blunt, and the penetration of the pointed head is naturally stronger than that of the blunt head, so the armor ability of the uranium alloy bullet core is a large distance away from other bullet cores; The third advantage is that uranium alloy burns violently when it penetrates the armor, so there is no need to fill the armor-piercing warhead of the uranium alloy core with explosives. Because it is a natural armor-piercing incendiary projectile, it will immediately ignite the ammunition and fuel in the vehicle after being fired into the tank, thus triggering a more powerful secondary destruction effect, so that the turret of the tank hit by the uranium alloy armor-piercing projectile will be lifted open without exception, forming a unique iconic landscape, and at the same time, because it can use a cap-piercing projectile with no explosive effect. The bullet core is also heavier, the penetration is more and more powerful, even in addition to the uranium alloy bullet core, the penetration power is also significantly different from that of uranium alloy, and the cost is much more expensive. …,

To what extent is the armor-piercing ability of uranium alloy shell-piercing shells? Not to mention artillery shells, even uranium alloy armor-piercing bullets used in 12.7mm anti-aircraft machine guns or anti-materiel sniper rifles can penetrate the armor of any tank of World War II at a distance of 1,000 meters (it can also be said that before the advent of composite armor and reactive armor, the armor of any tank was useless in front of it). The same is true for heavy tanks like the King Tiger, and due to the spontaneous combustion effect of uranium alloy after penetrating the armor, as long as even just one bullet enters the car, the tank will be completely finished. A King Tiger costs up to $200,000, and a uranium alloy armor-piercing sniper bullet costs less than $1, and anti-aircraft machine gun rounds are cheaper

Uranium is radioactive, so contamination is a real problem, but since uranium-238, which is weakly radioactive, accounts for more than 99% of natural uranium, the radioactive hazards of uranium alloys are far less terrible than advertised, while depleted uranium, which removes most of the uranium-235, is less radioactive. In fact, the reason why China has been promoting the harm of depleted uranium alloys in later generations is mainly because China lacks uranium and cannot use it in large quantities like the United States, so it can only "say that grapes are sour when they can't eat grapes".

In addition to army weapons, Hu Weidong also paid special attention to the current small air force, before going abroad he arranged the research and development of 30mm aviation guns, but due to the large gap between the quality of personnel and the level of technology and advanced countries, until Hu Weidong returned to China did not make a breakthrough, mainly because the size of the 30mm shell is too small, it is very difficult to make an explosive bullet, manual production is OK, and it is difficult to produce it in large quantities. Even after Hu Weidong brought back so many new machines, this problem is still not easy to overcome, and even if it is overcome, the cost is too high, after all, it is only 1937, and Hu Weidong has not bought back even a machine and equipment that can be directly used in military production

Hu Weidong did not reprimand these technicians who had done their best after listening to the complaints of the Jishu personnel, he understood that this was his own lack of consideration, the difference between the future and the present is too great, and some things that can be easily made in the 21st century are almost impossible to make in the current China, but Hu Weidong's remedy is very simple, "Enlarge the caliber of the aircraft gun to 37mm, it is better to make it universal, so that it can be used with at least most parts of tank guns and anti-aircraft guns, especially artillery shells, when necessary, Just in case. (To be continued.) If you like this work, you are welcome to (.) to vote for recommendation, monthly pass, your support is my biggest motivation. )