As a special aircraft and anti-aircraft weapon, this machine gun will be limited to base operations for a considerable period of time. The www.biquge.info is equipped with piercing and deflagration bombs, which are very powerful against lightly armored targets such as aircraft. The success of the imitation of the NSV machine gun, as well as the construction of the related ammunition production line, also put the work of copying large-caliber anti-materiel rifles on the work schedule.

This time, Yang Tianfeng chose to copy the Russian-made 12.7mm OSV-96 large-caliber sniper rifle. It has the advantages of "large diameter" and "semi-automatic", as well as the advantages of light weight, short dimensions when folding, and very easy to carry.

It is believed that once this ultra-modern heavy sniper is manufactured, it will give the special forces wings, and military targets within 1.5 kilometers will inevitably escape precision strikes.

As for the ultra-light* aircraft, the powered, three-corner, wing-wing aircraft, it is actually a suspension ****** equipped with an engine. Its main body is a triangular * wing made of "molded glue synthetic wood structure", powered by two 25-horsepower motorcycle engines, single-seater driving, with a maximum load of 100 kilograms, a maximum flight altitude of 2,600 meters, and a cruising speed of 150 kilometers.

Yes, compared to normal aircraft at the time, in terms of load, flight altitude and cruising speed, this ultra-light aircraft was not worth mentioning, and even the performance of the aircraft in the late World War I was inferior. But this was an attempt, but also an improvement, to be able to make a homemade airplane, and use the more advanced technology of the time "molded glue synthetic wooden structure".

In the history of aircraft development, light metal structures have replaced wood structures or steel tube/wood skin hybrid structures because they are stronger and lighter. However, the use of traditional timber structure in the aircraft obviously cannot achieve the purpose of weight reduction, so a rare wood structure - "molded glue synthetic wood structure" came into being.

The "molded plastic synthetic wood structure" was patented in the United States as early as 1922, and was also known as the "poor man's plane" because of its low production cost.

But Yang Tianfeng knew that many planes in World War II were made of wood, and the British-made Mosquito fighter-bomber was called one of the most successfully designed aircraft in World War II. However, an all-wooden aircraft has set the best record for the combat survival rate of bombers in the Royal Air Force, which is the pride of the British and a generation of famous aircraft full of legends.

However, changing the wood in the middle of the wood glue structure to light wood - paulownia can further reduce the weight of the aircraft structure, but increase the strength.

The key technology lies in glue, and the secret formula of various countries is not a problem at all in Yang Tianfeng's view. However, due to the production level of the coal chemical plant, he can only temporarily sourcing raw materials from various places to formulate phenolic adhesives and structural adhesives.

When the technology of the coal chemical plant has developed to a certain level, he can formulate better epoxy series adhesives. At the same time, he also instructed the workers to build a low-temperature drying workshop, and improved the surface treatment technology of wood, so that the production speed was greatly improved, and the application of gluing technology was greatly expanded.

The biggest advantage of building a wooden aircraft is that it is inexpensive and can be produced by any trained and skilled carpenter, rather than a desperate shortage of skilled workers who have mastered the technology of making metal structures for aircraft.

Of course, although the aircraft produced by using the existing captured engines was lighter and more flexible, it was limited by engine power, and Yang Tianfeng did not have the luxury of building a world-class fighter.

You must know that although the British Mosquito fighter-bomber is also made of wood, the horsepower of the engine is more than 2,000, which is far less than all the engines with hundreds of horsepower in Yang Tianfeng's hands. By next year, the little Japanese Zero fighter will also come out, and the horsepower will be close to 1,000.

Yang Tianfeng has thought about competing with the Zero, but more of a plan is to learn from Tian Ji's horse racing strategy, try to avoid the confrontation with the Zero, and specifically attack other devil planes with average performance.

As for the design of the first two wooden aircraft, Yang Tianfeng did not pursue faster and higher, but pursued small, flexible operation, easy maintenance, poor endurance, insufficient ground attack capability and other reasons, so he did not care at all. In other words, what he wants to build is an air superiority fighter that can defend the base area. So, he can discard all other uses to minimize the weight of the aircraft and achieve the best flight performance with limited horsepower.

Generally speaking, it is unlikely that a new fighter will succeed in designing, developing, and then producing without hundreds of tests and without two or three years of research and calculation. Of course, there are exceptions, such as Hellcat in the United States, which is fourteen months, which is already a very impressive record.

By estimating the weight of the aircraft and the horsepower of the engines, Yang Tianfeng decided to adopt the proven and mature design, that is, to build a smaller version of the Mosquito fighter with the bombing function removed.

There are no radars, there are no advanced electronics, there are no bomb racks...... Although the engine power is lower, the aircraft is lighter, and in Yang Tianfeng's calculations, it may also be able to achieve some of the performance of the Mosquito fighter-bomber.

"The main structure of the delta wing plane still looks like it can withstand the load." Yu Shao'an, who was an engineer at the Shaoguan Aircraft Factory in Guangdong, studied in the United States, and has considerable practical experience, and was appointed by Yang Tianfeng as the director and chief engineer of the aircraft factory. ”

"Inspections are necessary, but the path is certainly the right one." Yang Tianfeng pondered for a moment and said, "I have placed an order with Dading Engine Factory to order engines below three hundred horsepower. In this way, the super******** can fly faster, higher, and have more payload. ”

With the deterioration of the war situation, Shaoguan Aircraft Factory has moved to Kunming and changed its name to the First Aircraft Factory; The engine manufacturing workshop was moved to a natural cave in Dading County, Guizhou Province (now Dafang County). The Kunming plant has successively manufactured 22 Fuxing A primary training planes and 30 imitation Soviet I-15 fighters. In addition to repairing engines, the Dading Engine Factory can also manufacture old engines with low power (less than 300 horsepower).

And even if it is an old-fashioned engine, Yang Tianfeng needs it. For example, this delta wing * aircraft, due to its slow flight, does not exceed a maximum speed of more than 200 km / h, it is impossible to confront enemy fighters, but it is a reliable night bomber. It can fly at a very low altitude (radar blind spot), and the aircraft is so loud that you can't detect it unless it flies over your head, and it's difficult to intercept. (To be continued.) )