Tail-sitter VTOL Return: X PlusOne drone hovers steady, but also flies nose-first at 60 mph

Both Google and Belgium's Katholieke Universiteit Leuven are working on drone-based delivery projects that utilize UAVs which take off and land vertically, but that can also tip sideways to transition into fast and efficient fixed-wing flight.

And the solution is much similar to those lates 40s and 50s Triebflügel, Convair XFY-1 Pogo  or Lockheed XFV-1. But hybridizing them with a quad-copter.

For more info:
http://www.xcraft.io/

http://youtu.be/iVEMOv1sF18

http://www.gizmag.com/x-plusone-hovering-fixed-wing-drone/35242/