What are the characteristics of the development of aircraft technology?

Existing private jets and commercial jets have at least begun to dispel an impression; That is, flying and military aircraft have made outstanding achievements in the aviation field, but this impression is by no means complete, because new and old flying and bombers have been converted into commercial aircraft, while a large number of outdated commercial light aircraft have been left in private hands. This situation will last for a long time, which is the characteristic of aircraft development. In the late 1960s, before the Great Depression, the United States announced that there were more than 300 types of aircraft engaged in various forms of general aviation, and the total number of flights exceeded 3,000. According to statistics, in 1970, there were about 166000 aircraft engaged in general aviation, including 14 1(DO, 19000 two piston engines and 4000 helicopters).

The fun of private jet flight (don't forget that the flight of seaplanes in North America has greatly increased this fun) and the convenience and comfort brought by special planes need not be emphasized here. Although there may be a view that today's business is not only driven by air traffic, but actually carried out in the process of air travel. When larger routes are not navigable, it is not just special planes that serve businessmen, because short-haul flights are increasingly using new and eye-catching special planes, such as Beechcraft's flight 99A. These short flights have made great contributions to the benefit of aviation to society. Charter flights and charter flights are supplements to a variety of air cargo transportation services, requiring and receiving some special aircraft and adopting some old-fashioned aircraft. At that time, there were two different types of aircraft (both made great contributions to general aviation), one was the small Schott "Sky Truck" specially designed for cargo missions, and the other was the Gepi of the space company, which has always been one of the most amazing aviation aircraft. Fortunately, although Gepi aircraft was originally developed for transporting missile parts, it is also used to transport large parts of passenger aircraft to the assembly site. Surprisingly, there has never been a new type of aircraft to replace the "Conville" or "Bristol" transport aircraft in the passenger transport business.

With the continuous development and diversification of air traffic, a large number of air congestion problems have become a thorny issue, because each aircraft has its own special requirements. Although the occupational hazards in agricultural flight have not been reduced at all, various aircraft engaged in general aviation are still widely used in silent land. This flight activity and other related flight activities have maintained the lives of people all over the world and made them rich. As soon as the First World War ended, these flying activities began. At first, they were used to protect forests, and then they were used to detect fish at sea.

192 1 ~ 1922, the experiment of spraying pesticides on crops was carried out in Ohio agricultural experimental station with Curtis "female bird" left over from the war. By about 1925, a large number of crops were used in Louisiana and several neighboring States. A special plane for spraying pesticides was used to control weevils on cotton peaches. In order to be economically profitable, the aircraft used in agriculture today (often used by farmers themselves) use standard aircraft, although the original special aircraft still exist. Agrinaw Tix Company of the United States even generally adopted Douglas Dakota aircraft, and installed one of its various "aerial spraying devices" on this aircraft.

When cameras are widely used in industry, broadcasting and journalism, people put cameras on airplanes and use them to draw large areas of the earth's surface, which is another task of airplanes. The exploration of mineral deposits has made airplanes make an inestimable contribution to economic development. In addition to these activities, airplanes are sometimes used to serve civil engineers. Most of the largest oil companies in the world are the most enthusiastic advocates and users of air transport planes. Today, helicopters are regarded as an indispensable supporting equipment for offshore oil platforms. In fact, when fixed-wing aircraft are widely used, rotary-wing aircraft have gained civil use. This kind of plane is not only used to reduce losses, but also used to sprinkle water in the forest. It meets the growing demand of people for airplanes in social services.