Flying Saucer Looking Aircraft - AVROCAR

Flying Saucers in the 50's weren't just filling the skies... America was building one too, A true flying saucer. A circular craft with a large central fan, that sucked in air from the upper side and expelled it at the edges of the disk. It flew well at low altitudes of five or six feet, but when it tried to rise further it became unstable. Never did more than hover at low altitude, and was abandoned after seven months because of stability problems.