The creative mind behind so many of the flying wing concepts of the the 1940's (which lie outside the scope of these articles) John Northrup started it all with the Flying Wing aka Avion Experimental #1.
90hp Menasco A-4 pusher (later replaced by a tractor prop) Span: 30'6" Length: 20'5" Twin-boom, twin-tail prototype also acquired a 95hp Cirrus along the way. Was flown in both pusher and tractor formats (did better as a pusher). Only one made.