This is the US Air Force's real flying saucer (video)

In the late 1950s, the US Air Force funded a secret project to develop a flying saucer. Avro Canada engineer John 'Jack' Frost—the main mind behind the Avrocar—was deep into the 'Coandă effect,' a phenomenon in which fluid (including air) coming from an orifice stays close to the surrounding flat or curved surface, creating an area of lower pressure. — Read the rest