This is a rather dated article but I have been searching for more information on the mad monarch's designs for sometime now. The picture that accompanies the article only shows an airship with no indication of how the airscrew would look like.
http://www.guardian.co.uk/world/2006/aug/06/germany.theobserver
http://www.guardian.co.uk/world/2006/aug/06/germany.theobserver