France had some innovative concepts along these lines. Youtuber Mustard takes a look at the Coleoptere. Not a ducted fan but it has a duct in lieu of a wing.

France had some innovative concepts along these lines. Youtuber Mustard takes a look at the Coleoptere. Not a ducted fan but it has a duct in lieu of a wing. https://www.youtube.com/watch?v=unz6mfjS4ws https://www.youtube.com/watch?v=unz6mfjS4ws