Flights within the earth are possible taking into account our atmosphere composed of air. But when talking about flying through outer space or even an almost non-existent atmosphere or one that is composed of other gases like the planets in our solar system, propulsion methods and flight dynamics of the vehicles will be significantly affected.

The desire of vertical flight was always present, and it grew after the first successful flight of the wright flyer, but the technical limitations for reaching this did not give the needed result. Leonardo da Vinci illustrated a sophisticated “rotary-wing” similar to a helicopter, the main sketch that remain for years without any success.