An airplane (mbth) is heavier than air. It has one or more engines to generate forward thrust or pull, and the fixed wings of the fuselage generate lift.
The airplane is one of the most important inventions in the early 20th century, and it is generally believed that it was invented by the Wright brothers in America. According to the purpose, it can be divided into military aircraft and civil aircraft. The invention of aircraft has profoundly changed and influenced people's lives, and has increasingly become an indispensable means of transportation for modern civilization.
Detailed introduction
An airplane flying in the air is different from a vehicle moving on the ground. It has various flying postures. This refers to the changes of the plane's head up, head down, leaning to the left and leaning to the right. The flight attitude determines the motion of the aircraft, which not only affects the flight altitude, but also affects the flight direction.
When flying at low speed, the pilot can judge the attitude of the plane according to the position of the horizon by observing the ground. However, this feeling is not reliable, because the posture of the pilot's body changes with the posture of the aircraft. For example, when the plane turns at a small angle, the fuselage tilts seriously, and the pilot can't adjust the sense of balance quickly for a while.
Therefore, the position of the horizon can not be correctly judged, which may lead to the failure of the aircraft to return to the correct flight attitude. There are planes flying at night on the sea, and the dark sky and the dark sea will also twinkle with stars or light. In this dark night, it is difficult to tell where the sky is and where the sea is. If there is a slight mistake, the plane can easily fly into the sea.