It takes a lot of time just to organically combine people and equipment. But even so, Hu Weidong, who returned from his visit to the Soviet Union, still missed the first flight of the first plane in the border area (the first wind tunnel of greater significance was built before his visit to the Soviet Union), although this plane has almost no practical value, but as the so-called "everything is difficult at the beginning", after this step was taken, the future development of the aircraft manufacturing industry will be as fast as a day, after all, the jishu threshold of the piston aircraft is far less high than that of the later jet, and even if some aspects do not meet the design requirements, they can often think of tricks to make up for it.

In March 38, the Luoyang Aircraft Factory produced the first finalized aircraft - Chujiao 1, with the mass production of this primary training aircraft, China can finally begin to train pilots in large quantities, and in June 38, the improved "Chujiao 2" of the "Chujiao 1" and the first advanced training aircraft "Gaojiao 1" produced by China have also been finalized.

In August 38, Hu Weidong remembered the Soviet La-5 fighter and the British mosquito bomber (both are wooden structures, but they are both famous aircraft in World War II. The two aircraft were preliminarily designed and completed at the same time as the prototype and completed the first test flight after optimization by Wang Zhu and other Chinese and foreign aircraft designers. Although at this time, it is still far from the real finalization and mass production, but from this beginning, the Chinese saw for the first time the possibility of China's aviation industry catching up with the advanced level of Shijie

It is worth mentioning that as the heart of the aircraft, even with a piston engine, the jishu content is quite high. Otherwise, the United States and the Soviet Union in the middle and late stages of World War II would not have had to order from the British Rolls-Royce. However, even if Hu Weidong bought a lot of advanced machinery and equipment when he went abroad, and also dug up some engineers and Jishu workers dismissed by Rolls-Royce, Hu Weidong himself knew some advanced designs of internal combustion engines in later generations, and the aero engines independently produced in the border areas have reached the international level of 36 years at most, while the La-5 and the Mosquito are both advanced aircraft that were finalized and equipped with troops after 40 years in history, especially the Merlin engine used by the Mosquito is a high-performance Merlin engine. Even the earliest of them. The power has also reached 1250 horsepower (two engines), while the Central Plains Border Area has only successfully trial-produced a 900 horsepower aircraft engine (under the premise of the right size) until June 38, which is too big.

But Hu Weidong did not agree to lower the design standards of the aircraft. Instead, he took the time to brainstorm with the designers and came up with a lot of "crooked ways" to make up for the lack of the engine in other ways. First of all. It is the material used in the aircraft, Hu Weidong chose the Central Plains border area, although it is not as planted everywhere as Henan in later generations, but there are a lot of paulownia wood, although this wood is slightly heavier than the balsa wood used in the original British mosquito bomber in history, but the specific strength (i.e., strength/density) is greater, so the same strength of the components used paulownia wood to make is smaller and thinner than balsa wood, and the overall weight is slightly lighter. In particular, Hu Weidong also used Jishu, an epoxy resin that is currently the first in China (Note 1), to be used in this new bomber

Far beyond this era (invented at the end of the 20th century), epoxy resin surface reinforcement jishu makes the surface hardness of paulownia wood even surpass that of ordinary steel. And it must be noted that among all the types of light wood on shijie. Only paulownia wood does not absorb epoxy resin and infiltrate and deform, so this new jishu can be applied, and although paulownia has been introduced in some countries, the proportion of finished wood is very small, and even a small number of finished paulownia. In terms of quantity and quality, it is far from being comparable with Henan, the place of origin, so this kind of aircraft cannot be imitated by other countries even if they want to...,

With such a light and strong body material, the engine thrust requirements are naturally relatively reduced, and the turbocharging jishu applied to the aircraft in advance of the same period in history has significantly improved the performance of the aircraft engine, and it has not been too much of a hindrance. And under the guidance of the increasingly popular principles of parallel engineering, the border aircraft Shiyan improved at the same time. More attention was paid to engine improvements, and by the time the two models were finalized and mass production began, the overall performance of the aircraft had surpassed the two prototypes (early models) in history

China's weak industrial base and the reason why it has been able to make such tremendous progress in a short period of time is that in addition to the hard work of the R&D personnel and the correct guidance of Hu Weidong, a traverser, it is also very important to actively learn and digest the strengths of European, American, Soviet and even Japanese engines. Among them, the Japanese-style engine and the Soviet-style engine were not valued at all at the beginning, because there was indeed a large gap between the performance of the two compared with European and American products, but a undergraduate student named Wu Zhonghua of the Department of Aeronautics of the School of Engineering of Zhongyuan University majored in engines had a clear understanding after studying the "Theory of Contradiction" and "Theory of Practice" published not long ago, and found that although the Japanese-style engine and the Soviet-style engine were more backward than those in Europe and the United States, they also had their own advantages, which were worthy of serious study by Chinese aviation people. The advantages of the Japanese-style engine are that it saves materials and has low fuel consumption, which is of great practical significance for China, which has a large population and relatively few resources (Hu Weidong has been trying to promote this view); The low requirements of the Soviet-style engine for the industrial base are also very close to the current situation of China's industrialization in its infancy

Hu Weidong couldn't help but be surprised when he heard the name Wu Zhonghua, and immediately came to his information to take a look, it turned out that this son was originally a student of the Department of Mechanical Engineering of Tsinghua University, and only came to the Central Plains Border Region after the 15th Army conquered Beiping, and then was admitted to Zhongyuan University and changed to his current major. After Hu Weidong recalled carefully for a while, he couldn't help but say with joy on his face, "It's Wu Lao, it won't be wrong, there were too many schools he studied in his early years, and I couldn't find it, but I didn't expect it to be 'stepping on iron shoes and finding nowhere to go, and it didn't take much effort to get it.'" ’！ ”

Wu Zhonghua can be said to be one of the most outstanding aero engine experts in Shijie in the second half of the 20th century, and many of his theoretical achievements have been adopted abroad, which has greatly promoted the progress of Shijie engine, especially the aero engine Jishu. However, the engine industry of New China has turned back again and again due to a series of changes, so that it has wasted 30 years, Wu Zhonghua has an empty stomach of learning, Zuihou is still depressed, after all, the investment required by the aero engine industry is too large, without the support of the state liliang, no matter how capable the individual is, he will not be able to do anything

Note 1: Although the Swiss epoxy resin expert is not inferior to Li Green, who was dug by Hu Weidong, Li Greene has been supported by a large number of people, money and materials from the border district government in the past two years, and Hu Weidong also pointed out to him the correct development direction of epoxy resin, but that one has not been able to get strong support. If you like this work, you are welcome to vote for recommendation and monthly passes, and your support is my biggest motivation. )