The Prototype 10 engine Electric drone Greased Lightning ( GL-10) has both hover and plane mode.   The prototype drone from NASA is currently in its testing stage, with the ability to take off vertically the drone has passed its hovering tests with flying colours, but the next stage is the transition from vertical to forward “wing-borne” flight. As engineers who have designed full-scale vertical take off and landing tiltrotors such as the V-22 Osprey will…