How do airballoons change direction and choose where to land?|121981

I was looking at airballoons the other day and my friends and I were wondering how do the airballoons land and choose direction?

Basically they cannot change directions. They are at the mercy of the wind. They will land where they are at the time the air is let out.

its all about the hot air generators to go up and down, and large fans to propel in the direction you want to go