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. For the VZ-9, the idea was that the Coandă effect would redirect the air under the vehicle to provide lift. Unfortunately, it didn't make the grade as a high-speed combat aircraft so the US Army picked up the project, hoping to be the basis of a new kind of helicopter. As evidenced by the video below, that didn't quite work out either. The project was cancelled in 1961…. or was it?!
This is the US Air Force's real flying saucer (video)
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