NASA's 'Greased Lightning'.

NASA's new 'Greased Lighting' - or GL-10 for short - is an unmanned electric plane which combines the design and functionality of a helicopter and an airplane. 

With the helicopters ability to take off vertically, eliminating the need for a runway, and the speed of an airplane, this unmanned vehicle has many potential applications, including use as a delivery system, or as a surveillance and mapping tool. 

With 10 engines (4 motors on each wing and 2 on the tail), and a wingspan of 10 feet, NASA is considering the possibility of scaling up to versions which could carry 1 to 4 people as well.

While still in the development stage, the GL-10 recently passed NASA's tests by successfully transitioning from hover to flight mode, and back to hover, on five separate flights.