7 Flight Mystery and Aerodynamic Principles
455
Fig. 7.11 Wilbur Wright (1867–1912, left) and Orville Wright (1871–1948, right), two
American inventors, aircraft manufacturers
social civilization. Aviation science and technology has become an important
product of scientific and technological achievement and the development of
social civilization.
Although humans have no wings, they have a brain with infinite wisdom
and illusions. Through the understanding and practice of the bird’s flight
mystery, human beings create various aircraft, which in terms of scale, flight
altitude, flight speed, flight range, complexity, etc., far exceed those of birds;
also far more than the famous verse of Li Shangyin in Tang Dynasty, “We
have no wings to fly side by side. Yetone sharp arrow wounded yours and my
heart”. As shown in Fig. 7.13a, the swan is said to be the most feathered bird,
but the sum of feathers and bones is 25,000; the common aircraft Boeing
747-400 has more than 6,000,000 parts (As shown in Fig. 7.13b) is 10 6
times that of train and auto parts. The complexity of the aircraft far exceeds
that of birds.
The number of aircraft flying in the atmosphere is huge and there are many
types. Aircraft can be divided into two categories, one is the aircraft that
generates lift by air buoyancy. The density of such aircraft is lighter than
455
Fig. 7.11 Wilbur Wright (1867–1912, left) and Orville Wright (1871–1948, right), two
American inventors, aircraft manufacturers
social civilization. Aviation science and technology has become an important
product of scientific and technological achievement and the development of
social civilization.
Although humans have no wings, they have a brain with infinite wisdom
and illusions. Through the understanding and practice of the bird’s flight
mystery, human beings create various aircraft, which in terms of scale, flight
altitude, flight speed, flight range, complexity, etc., far exceed those of birds;
also far more than the famous verse of Li Shangyin in Tang Dynasty, “We
have no wings to fly side by side. Yetone sharp arrow wounded yours and my
heart”. As shown in Fig. 7.13a, the swan is said to be the most feathered bird,
but the sum of feathers and bones is 25,000; the common aircraft Boeing
747-400 has more than 6,000,000 parts (As shown in Fig. 7.13b) is 10 6
times that of train and auto parts. The complexity of the aircraft far exceeds
that of birds.
The number of aircraft flying in the atmosphere is huge and there are many
types. Aircraft can be divided into two categories, one is the aircraft that
generates lift by air buoyancy. The density of such aircraft is lighter than