ps: Thank you for the monthly ticket voted by the book friend "Debiao", today Monday, ask for a recommendation vote ^^

Speed and ceiling have always been Hu Weidong's two most important aircraft performance, whether it is for fighters or bombers, but what the former Hewlett-Packard engineer said is not unreasonable, for China, which is still very weak in the current industrial base, rather than pursuing the superiority of performance, it is better to ensure that the product is "simple and reliable" to be more practical. Come on,.! ……

Although Hu Weidong knew a little about engines, there was no standard answer to the liquid-cooled air-cooled controversy, and he was not confident that he would be able to make the right choice, so it was natural for him to turn to two experts, Tupolev and Sukhoi, for help.

As a result, the master and apprentice all agreed that air-cooled engines were better, Tupolev mainly considered that China's industrial base was weak, and it was more difficult to develop and produce liquid-cooled engines, so it was more practical to choose air-cooled engines. Tupolev admits that the Central Plains border region has reached the advanced level of Shijie in some jishu, but if you analyze all aspects, it is difficult to say that the overall level of aero engine jishu is stronger than that of the Soviet Union and Japan, and both countries are dominated by air-cooled engines......

Sukhoi's answer was more convincing, on the one hand. He analyzed the advantages of air-cooled engines as described by engine engineers in more detail. Take survivability, for example. First of all, the air-cooled engine is simple and reliable, so the failure rate is low, which naturally reduces the occurrence of flight accidents; Then, once the water tank of the liquid-cooled engine is damaged, the aircraft will soon crash due to overheating of the engine, while the air-cooled engine does not have this weakness, so the survivability of the aircraft and the pilot is naturally much higher; zuihou。 Air-cooled engines are not as sophisticated as liquid-cooled engines, and even if one or two cylinders are broken, they can still work properly, and even if they are hit with a lot of holes, the pilot may drive the plane back, and the chances of parachuting out are much greater than that of a liquid-cooled aircraft. What's more, the fuselage built with reinforced paulownia wood as the main body is already sturdy and abnormal, and the machine gun, and even the anti-aircraft machine gun (it is naturally possible to use tungsten core armor-piercing bullets, but even if it is the old beauty of the rich armor world. They may not be able to afford it. Unless the distance is very close or the caliber is large (more than 30), it is difficult to cause substantial damage to the solid air-cooled engine, especially the engine materials used in the border area are slightly heavier. But the strength is amazingly large (modern cannon tube steel has been changed, it's not strange...... It will be even stronger, and even if it is really hit by a large-caliber aerial artillery, it may not be a big problem. For this reason, the J-1 even got the nickname of "flying tank......

Considering these three aspects, if you use an air-cooled engine. The loss rate of pilots can be reduced by at least half, and China does not have an extremely large reserve of amateur pilots like the Western powers and the Soviet Union, and in addition, the country is weak and the people are poor, no matter how much attention is paid to it, it is impossible to train a large number of pilots, and naturally all of them are very expensive, so Hu Weidong must not ignore this advantage.

On the other hand, Sukhoi pointed out that although air-cooled aircraft are not as good as liquid-cooled aircraft in terms of speed and high-altitude performance, the gap is not so big, at least not so big that it is unbearable. First of all, the speed, although the installation of the air-cooled engine will make the shape of the nose become thick and increase the flight resistance, but the details of the aerodynamic layout design haode, the impact can be greatly reduced, and it is not only the drag that determines the speed of the aircraft, the power is also important, and generally speaking, under the same conditions and size, the power of the air-cooled engine can be made larger than the liquid-cooled engine, and it is not just a little larger, which largely balances the defects of the nose resistance. Although even this speed is still slightly slower than that of the liquid-cooled one, the maximum speed is only 5%-10% worse, and the effect of cruise speed is smaller, which is completely tolerable; As for high-altitude performance, with the help of exhaust gas turbochargers, even with the use of air-cooled engine drives, the aircraft can easily exceed the ceiling of 10000 meters, which is quite enough in general. What's more, Sukhoi has always believed that under the premise that the gap is not too large, maneuverability is more important than the maximum speed and ceiling, although the tactic of "one blow away" is very incomprehensible, but the lethal efficiency is too low, if the enemy is not afraid of losses, with a superior number of aircraft group forcibly penetrates our airspace, bombing our airfields, oil depots and other important targets, our side has no way at all, but the fighter with excellent maneuverability can entangle the enemy plane, so that it can not bomb, this can be called "interception"!

However, what completely convinced Hu Weidong was Sukhoi's words, "It is enough to be significantly better than the enemy's performance, and excessive pursuit of performance will only lead to unnecessary waste, after all, you get what you pay for." And the enemy of Chinese aircraft is Japanese aircraft, they also use air-cooled engines, so it is enough for us to use air-cooled engines, after all, we have turbochargers, and when the engine performance is comparable, the Japanese aircraft cannot win against us! ”

When it comes to turbochargers, in fact, due to the limitations of materials and processes during World War II in history, only the United States has successfully developed models that can be used in large quantities, and the performance is far from comparable with the mature products of later generations, only the effect is good at high altitude, and compared with the mechanical supercharger that needs to occupy additional engine power, the advantages are not very large, for example, the P51 "Mustang" fighter did not choose a turbocharger, but it still became the most successful fighter recognized during World War II. At low altitudes, the turbochargers produced in the United States during World War II even reduced the effective output of the engine, but the impact was smaller than that of superchargers.

In addition, the exhaust gas turbocharger during World War II in history still had a series of defects such as complex structure, poor reliability, and high cost (expensive labor and materials), which naturally did not satisfy Hu Weidong. However, Hu Weidong only has a general understanding of engines, although he uses high-temperature, high-pressure, corrosion-resistant, and extremely strong tank barrel steel materials derived from high-temperature-resistant low-alloy steel materials (reducing the amount of rare metals, eliminating some heat treatment steps unrelated to high-temperature performance, thus greatly reducing costs). It's enough to meet the needs of turbochargers, and the cost is relatively low, but it's still useless without a good design. Hu Weidong originally thought that it would take at least two or three years for mature products to come out, but after coming to China, the old monster Nikolai has created a series of miracles. Tesla has once again shown his magic......

!