文档介绍：Dream of Flying
and Flying Aircrafts
people dreamed to fly like birds soaring higher into the sky
people begin to think why they can’t fly
For thousands of years people dreamed to fly like birds soaring higher into the sky.
The flying dream made people begin to think why they can’t fly like birds?
They are too heavy
Their wing bones are hollow
After thousands of failure attempts, people noticed that they are too heavy and the most important thing for the birds to fly is that their wing bones are hollow which undoubtedly greatly reduce the weight of the bird.
In a word: if we want to fly in the sky ,We have to rely on aircraft.
with the flying dream people are making unremitting efforts to invent different types of aircraft.
Dream is the impulsion of forward, with the flying dream people are making unremitting efforts to invent different types of aircraft.
Aircraft can be generally grouped into3 types.
fixed-wing aircraft
rotating-wing aircraft
ornithopter