What are the types of aerial vehicles, what is the principle of flight of each type, and what are the advantages and disadvantages of each type?

There are usually three types of vehicles: aircraft, spacecraft, rockets and missiles.

Aerostats are vehicles that are capable of controlled flight within the atmosphere. It mainly relies on the air static buoyancy to lift off, its own powerless device, after lifting off with the wind, can not be controlled. This type of aircraft is also known as the floating aircraft, there are airships, balloons and so on.

Spacecraft refers to the cosmic space outside the earth's atmosphere, basically in accordance with the laws of celestial mechanics, all kinds of vehicles. Spacecraft, also known as space vehicles, generally divided into two categories: one is an unmanned spacecraft, such as artificial Earth satellites and space probes, etc.;

Rocket is a rocket engine-powered vehicle, can be in the atmosphere, but also in the atmosphere outside the flight. It does not rely on aerostatic buoyancy or aerodynamic forces, but only on engine thrust to lift off and fly.

Missiles can be divided into two categories: one is in the atmosphere flying wingless missiles, such as ballistic missiles, etc.; the second is in the atmosphere flying winged missiles, such as cruise missiles, surface-to-air missiles, air-to-ground missiles, etc.. The flight principle of winged missiles is basically the same as that of airplanes. The main difference between missiles and rockets is that one is equipped with a combat part, which can be used as a weapon, and one is not equipped with a combat part, which is only used as a means of delivery.

Any aircraft must produce an upward force greater than its own gravity to rise into the air.