A saucer u say ? Well they've built a lot of 'em. Haunebu and Vril series. They had electro-magnetic engines or smthing like that.
http://www.youtube.com/watch?v=UKZpNBYFajI
http://www.naziufos.com/ <-- piloted V-2, sound cannons etc.
http://www.geocities.com/Pentagon/2833/wunderwaffen/supergun/soundcannon/soundcannon.html
It's just sick how brutal ideas they had and even more sick is they actually made a lot of these concepts.
It's more a curse than the shame >:(