I just found out my Dad (EE graduate from Michigan) worked on this project in the 50's (his company worked on the controls of the Avrocar). He could never talk about it until he saw on AOL that they just declassified it. He said he used to sit around and just keep his mouth shut when the topic of burned circles found in fields was brought up. http://www.huffingtonpost.com/2012/10/08/air-force-tried-to-build-flying-saucer_n_1949185.html I see lots of criticisms of the engineering concepts in blog posts...but I think the controls worked fine!