No 2. Flying Pancake

Officially, the Vought V-173 was designed by Charles H. Zimmerman. It was an American experimental test aircraft built as part of the Vought XF5U “Flying Flapjack” World War II United States Navy fighter aircraft program and without doubt if is one of the most strangest planes ever built.

[youtube]http://www.youtube.com/watch?v=LfpTDOAfj7Y[/youtube]

No 1. Boeing X-48

Currently under development by Boeing and NASA, the X-48 is an experimental unmanned aerial vehicle for investigation into the characteristics of blended wing body (BWB) aircraft, a type of flying wing. Three variants of the plane have been Designed so far, X-48A, which was cancelled before manufacturing, X-48B and X-48C.